Latest in astro-ph.im

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Towards Efficient Detection of Small Near-Earth Asteroids Using the Zwicky Transient Facility (ZTF)Apr 21 2019We describe ZStreak, a semi-real-time pipeline specialized in detecting small, fast-moving near-Earth asteroids (NEAs) that is currently operating on the data from the newly-commissioned Zwicky Transient Facility (ZTF) survey. Based on a prototype originally ... More
Identification of organic molecules with a laboratory prototype based on the Laser Ablation-CosmOrbitrapApr 20 2019In the Solar System, extra-terrestrial organic molecules have been found on cometary primitive objects, on Titan and Enceladus icy moons and on Mars. Identification could be achieved for simple organic species by remote sensing based on spectroscopic ... More
The expectation of cosmic ray proton and helium energy spectrum below 4 PeV measured by LHAASOApr 19 2019Large High Altitude Air Shower Observatory(LHAASO) is a composite cosmic ray observatory consisting of three detector arrays: kilometer square array (KM2A) which includes the electromagnetic detector array and muon detector array, water Cherenkov detector ... More
New and Extended Data Processing of Mars Odyssey Neutron Spectrometer DataApr 18 2019The Los Alamos National Laboratory designed and built Mars Odyssey Neutron Spectrometer (MONS) has been in excellent health operating from February 2002 to the present. MONS measures the neutron leakage albedo from galactic cosmic ray bombardment of Mars. ... More
Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527Apr 18 2019The Gemini Planet Imager (GPI) contains a 10-hole non-redundant mask (NRM), enabling interferometric resolution in complement to its coronagraphic capabilities. The NRM operates both in spectroscopic (integral field spectrograph, henceforth IFS) and polarimetric ... More
Sub-GeV Dark Matter Searches and Electric Field Studies for the LUX and LZ ExperimentsApr 18 2019The nature of dark matter (DM) remains a mystery since it has so far eluded detection in the laboratory. To that end, the Large Underground Xenon (LUX) experiment was built to directly observe the interaction of DM with xenon target nuclei. LUX acquired ... More
A joint deconvolution algorithm to combine single dish and interferometer data for wideband multi-term and mosaic imagingApr 18 2019Imaging in radio astronomy is usually carried out with a single-dish radio telescope doing a raster scan of a region of the sky or with an interferometer that samples the visibility function of the sky brightness. Mosaic observations are the current standard ... More
All-Sky Near Infrared Space AstrometryApr 18 2019Gaia is currently revolutionizing modern astronomy. However, much of the Galactic plane, center and the spiral arm regions are obscured by interstellar extinction, rendering them inaccessible because Gaia is an optical instrument. An all-sky near infrared ... More
Convolutional neural networks: a magic bullet for gravitational-wave detection?Apr 18 2019In the last few years, machine learning techniques, in particular convolutional neural networks, have been investigated as a method to replace or complement traditional matched filtering techniques that are used to detect the gravitational-wave signature ... More
SkyMapper SEDs of nearby galaxies: quenching and bursting probed by a change index for star formationApr 18 2019The wish list of astronomers includes a tool that reveals quenching of star formation in galaxies directly as it proceeds. Here, we present a proof-of-concept for a new quenching-and-bursting diagnostic, a "change index" for star formation, that requires ... More
Fast W-Projection for Wide-field ImagingApr 17 2019Wide-field imaging has become a major challenge for modern radio astronomy, which uses high sensitivity acquisition systems that deal with huge amounts of data. In this paper we investigate a fast wide-field imaging solution based on the w-projection ... More
Recovering Thermodynamics from Spectral Profiles observed by IRIS: A Machine and Deep Learning ApproachApr 17 2019Inversion codes allow reconstructing a model atmosphere from observations. With the inclusion of optically thick lines that form in the solar chromosphere, such modelling is computationally very expensive because a non-LTE evaluation of the radiation ... More
Recovering Thermodynamics from Spectral Profiles observed by IRIS: A Machine and Deep Learning ApproachApr 17 2019Apr 18 2019Inversion codes allow reconstructing a model atmosphere from observations. With the inclusion of optically thick lines that form in the solar chromosphere, such modelling is computationally very expensive because a non-LTE evaluation of the radiation ... More
Moving Towards Greater Equity, Diversity, and Inclusion in AstronomyApr 17 2019A diverse workforce and open culture are essential to satisfaction in the workplace, to innovation and creativity, and to the ability of an organisation to attract and retain talent. To ensure a diverse and inclusive workplace, efforts can be made to ... More
High Spatial Resolution Thermal-Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BCApr 16 2019We present 2.9-4.1 micron integral field spectroscopy of the L4+L4 brown dwarf binary HD 130948BC, obtained with the Arizona Lenslets for Exoplanet Spectroscopy (ALES) mode of the Large Binocular Telescope Interferometer (LBTI). The HD 130948 system is ... More
The Design and Implementation of a ROACH2+GPU based Correlator on the Tianlai Dish ArrayApr 16 2019The digital correlator is a crucial element in a modern radio telescope. In this paper we describe a scalable design of the correlator system for the Tianlai pathfinder array, which is an experiment dedicated to test the key technologies for conducting ... More
Using Cosmogenic Lithium, Beryllium and Boron to Determine the Surface Ages of Icy Objects in the Outer Solar SystemApr 16 2019Given current uncertainties in the cratering rates and geological histories of icy objects in the outer solar system, it is worth considering how the ages of icy surfaces could be constrained with measurements from future landed missions. A promising ... More
On the performance limits of coatings for gravitational wave detectors made of alternating layers of two materialsApr 16 2019The coating design for mirrors used in interferometric detectors of gravitational waves currently consists of stacks of two alternating dielectric materials with different refractive indexes. In order to explore the performance limits of such coatings, ... More
On the performance limits of coatings for gravitational wave detectors made of alternating layers of two materialsApr 16 2019Apr 18 2019The coating design for mirrors used in interferometric detectors of gravitational waves currently consists of stacks of two alternating dielectric materials with different refractive indexes. In order to explore the performance limits of such coatings, ... More
On the performance limits of coatings for gravitational wave detectors made of alternating layers of two materialsApr 16 2019Apr 22 2019The coating design for mirrors used in interferometric detectors of gravitational waves currently consists of stacks of two alternating dielectric materials with different refractive indexes. In order to explore the performance limits of such coatings, ... More
The footprint of cometary dust analogues: II. Morphology as a tracer of tensile strength and application to dust collection by the Rosetta spacecraftApr 16 2019The structure of cometary dust is a tracer of growth processes in the formation of planetesimals. Instrumentation on board the Rosetta mission to comet 67P/Churyumov- Gerasimenko captured dust particles and analysed them in situ. However, these deposits ... More
Self-gravitational Force Calculation of High-Order Accuracy for Infinitesimally Thin Gaseous DisksApr 16 2019Self-gravitational force calculation for infinitesimally thin disks is important for studies on the evolution of galactic and protoplanetary disks. Although high-order methods have been developed for hydrodynamic and magneto-hydrodynamic equations, high-order ... More
Galaxy-Targeting Approach Optimized for Finding the Radio Afterglows of Gravitational Wave SourcesApr 15 2019Kilonovae and radio afterglows of neutron star merger events have been identified as the two most promising counterparts, of these gravitational wave sources, that can provide arcsecond localization. While several new and existing optical search facilities ... More
Machine Learning in Astronomy: a practical overviewApr 15 2019Astronomy is experiencing a rapid growth in data size and complexity. This change fosters the development of data-driven science as a useful companion to the common model-driven data analysis paradigm, where astronomers develop automatic tools to mine ... More
New Binary Black Hole Mergers in the Second Observing Run of Advanced LIGO and Advanced VirgoApr 15 2019We report the detection of new binary black hole merger events in the publicly available data from the second observing run of advanced LIGO and advanced Virgo (O2). The mergers were discovered using the new search pipeline described in Venumadhav et ... More
Primary beam effects of radio astronomy antennas - II. Modelling the MeerKAT L-band beamApr 15 2019After a decade of design and construction, South Africa's SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate model of the primary beam of its ... More
A generalized differential image motion monitorApr 15 2019We present the Generalised Differential Image Motion Monitor. It is a compact instrument dedicated to measure 4 parameters of the optical turbulence: seeing, isoplanatic angle, coherence time and wavefront coherence outer scale. GDIMM is based on a small ... More
A search for solar axion induced signals with COSINE-100Apr 15 2019We present results from a search for solar axions with the COSINE-100 detector. We find no evidence of solar axion events from a data set of 6,303.9 kg$\cdot$days exposure and set a 90\,\% confidence level upper limit on the axion-electron coupling, $g_{ae}$, ... More
Beta-delayed-neutron studies of $^{135,136}$Sb and $^{140}$I performed with trapped ionsApr 14 2019Beta-delayed-neutron ($\beta$n) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The $\beta$n branching ratios and energy spectra for $^{135,136}$Sb and $^{140}$I were obtained by measuring the time of flight ... More
Direct measurement of stellar angular diameters by the VERITAS Cherenkov TelescopesApr 12 2019The angular size of a star is a critical factor in determining its basic properties. Direct measurement of stellar angular diameters is difficult: at interstellar distances stars are generally too small to resolve by any individual imaging telescope. ... More
Towards mapping the turbulence in the intra-cluster medium -- II. Measurement uncertainties in the estimation of structure functionsApr 12 2019X-ray observations of the hot gas filling the intra-cluster medium provide a wealth of information on the dynamics of clusters of galaxies. The global equilibrium of the ICM is believed to be partially ensured by non-thermal pressure support, notably ... More
Towards mapping turbulence in the intra-cluster medium -- I. Sample variance in spatially-resolved X-ray line diagnosticsApr 12 2019X-ray observations of galaxy clusters provide insights on the nature of gaseous turbulent motions, their physical scales and on the fundamental processes they are related to. Spatially-resolved, high-resolution spectral measurements of X-ray emission ... More
The use of convolutional neural networks for modelling large optically-selected strong galaxy-lens samplesApr 12 2019We explore the effectiveness of deep learning convolutional neural networks (CNNs) for estimating strong gravitational lens mass model parameters. We have investigated a number of practicalities faced when modelling real image data, such as how network ... More
Pushing the Limits of Exoplanet Discovery via Direct Imaging with Deep LearningApr 12 2019Further advances in exoplanet detection and characterisation require sampling a diverse population of extrasolar planets. One technique to detect these distant worlds is through the direct detection of their thermal emission. The so-called direct imaging ... More
Planning the scientific applications of the Five-hundred-meter Aperture Spherical radio TelescopeApr 12 2019The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is by far the largest telescope of any kind ever built. FAST produced its first light in September 2016 and it is now under commissioning, with normal operation to commence in late 2019. ... More
Transient processing and analysis using $\texttt{AMPEL}$: Alert Management, Photometry and Evaluation of LightcurvesApr 11 2019Both multi-messenger astronomy and new high-throughput wide-field surveys require flexible tools for the selection and analysis of astrophysical transients. We here introduce the Alert Management, Photometry and Evaluation of Lightcurves (AMPEL) system, ... More
DeepStreaks: identifying fast-moving objects in the Zwicky Transient Facility data with deep learningApr 11 2019We present DeepStreaks, a convolutional-neural-network, deep-learning system designed to efficiently identify streaking fast-moving near-Earth objects that are detected in the data of the Zwicky Transient Facility (ZTF), a wide-field, time-domain survey ... More
Ground-based Gamma-Ray Astronomy: an IntroductionApr 11 2019During the last two decades Gamma-Ray Astronomy has emerged as a powerful tool to study cosmic ray physics. In fact, photons are not deviated by galactic or extragalactic magnetic fields so their directions bring the information of the production sites ... More
Radio Observational Constraints on Turbulent Astrophysical PlasmasApr 11 2019Remarkable progress has been made in understanding turbulent astrophysical plasmas in past decades including, notably, the solar wind and the interstellar medium. In the case of the solar wind, much of this progress has relied on in situ measurements ... More
A Stochastic LBFGS Algorithm for Radio Interferometric CalibrationApr 11 2019We present a stochastic, limited-memory Broyden Fletcher Goldfarb Shanno (LBFGS) algorithm that is suitable for handling very large amounts of data. A direct application of this algorithm is radio interferometric calibration of raw data at fine time and ... More
A Stochastic LBFGS Algorithm for Radio Interferometric CalibrationApr 11 2019Apr 13 2019We present a stochastic, limited-memory Broyden Fletcher Goldfarb Shanno (LBFGS) algorithm that is suitable for handling very large amounts of data. A direct application of this algorithm is radio interferometric calibration of raw data at fine time and ... More
Reducing activity-induced variations in a radial-velocity time series of the Sun as a starApr 11 2019The radial velocity of the Sun as a star is affected by its surface convection and magnetic activity. The moments of the cross-correlation function between the solar spectrum and a binary line mask contain information about the stellar radial velocity ... More
First Light of Engineered Diffusers at the Nordic Optical Telescope Reveal Time Variability in the Optical Eclipse Depth of WASP-12bApr 10 2019We present the characterization of two engineered diffusers mounted on the 2.5 meter Nordic Optical Telescope, located at Roque de Los Muchachos, Spain. To assess the reliability and the efficiency of the diffusers, we carried out several test observations ... More
Bayesian cross validation for gravitational-wave searches in pulsar-timing array dataApr 10 2019Gravitational-wave data analysis demands sophisticated statistical noise models in a bid to extract highly obscured signals from data. In Bayesian model comparison, we choose among a landscape of models by comparing their marginal likelihoods. However, ... More
Revealing dust segregation in protoplanetary discs with the help of multi-frequency spectral index mapsApr 10 2019Dust is known to drift and grow in protoplanetary discs, which results in dust segregation over the disc extent. Maps of the spectral index $\alpha$ are a common tool for studying the dust content in protoplanetary discs. The analysis of observationally ... More
Applicability study of the PRIMAD model to LIGO gravitational wave search workflowsApr 10 2019The PRIMAD model with its six components (i.e., Platform, Research Objective, Implementation, Methods, Actors, and Data), provides an abstract taxonomy to represent computational experiments and enforce reproducibility by design. In this paper, we assess ... More
Stars and exoplanets in Stokes IQUV: a decadal opportunity for HIRES at the ELTApr 10 2019We proposed that the European ELT will be equipped with an ultra-high-precision polarimetric light feed as part of its high resolution optical and near-IR spectrograph HIRES. Such a feed is unique among the new ELTs and only possible in a rotationally ... More
The Detailed Science Case for the Maunakea Spectroscopic Explorer, 2019 editionApr 09 2019(Abridged) The Maunakea Spectroscopic Explorer (MSE) is an end-to-end science platform for the design, execution and scientific exploitation of spectroscopic surveys. It will unveil the composition and dynamics of the faint Universe and impact nearly ... More
BinarySkyHough: a new method to search for continuous gravitational waves from unknown neutron stars in binary systemsApr 09 2019Non-axysymmetric, fast-spinning unknown neutron stars in binary systems may emit continuous gravitational waves (nearly-monochromatic long-duration signals) which can be detected by ground-based detectors like LIGO and Virgo. In this paper we present ... More
The QUEST-La Silla AGN Variability Survey: selection of AGN candidates through optical variabilityApr 09 2019We used data from the QUEST-La Silla Active Galactic Nuclei (AGN) variability survey to construct light curves for 208,583 sources over $\sim 70$ deg$^2$, with a a limiting magnitude $r \sim 21$. Each light curve has at least 40 epochs and a length of ... More
Stellar activity and rotation of the planet host Kepler-17 from long-term space-borne photometryApr 09 2019The study of young Sun-like stars is of fundamental importance to understand the magnetic activity and rotational evolution of the Sun. Space-borne photometry by the Kepler telescope provides unprecedented datasets to investigate these phenomena in Sun-like ... More
An open source toolkit for the tracking, termination and recovery of high altitude balloon flights and payloadsApr 08 2019We present an open source toolkit of flight-proven electronic devices which can be used to track, terminate and recover high altitude balloon flights and payloads. Comprising a beacon, pyrotechnic and non-pyrotechnic cut-down devices plus associated software, ... More
Astro2020 APT White Paper: "Mind the gap": a call to redesign astronomy graduate educationApr 08 2019About one fifth of Ph.D's across all STEM disciplines secure a tenure track position in academia. It is also the case that science and engineering have evolved significantly and so has the nature of the labor market and the increasingly multidisciplinary ... More
Fitting of extended sub-grid scale models in compressible turbulent MHDApr 08 2019The use of Large Eddy Simulations in compressible, turbulent MHD is often limited to the implementation of purely dissipative sub-grid scale models. While such models work well in the hydrodynamic case due to the universality of the spectrum, they do ... More
Ensuring Uninterrupted Power Supply to Lunar Installations Through an Organic Rankine CycleApr 08 2019Apr 12 2019We propose using the temperature gradients between the Moon's surface and the soil at a certain depth to power an Organic Rankine Cycle that could supply a permanent installation, particularly at night, when solar power is not available. Our theoretical ... More
Ensuring Uninterrupted Power Supply to Lunar Installations Through an Organic Rankine CycleApr 08 2019We propose using the temperature gradients between the Moon's surface and the soil at a certain depth to power an Organic Rankine Cycle that could supply a permanent installation, particularly at night, when solar power is not available. Our theoretical ... More
Astrophysical constraints on the proton-to-electron mass ratio with FASTApr 08 2019Apr 09 2019That the laws of physics are the same at all times and places throughout the Universe is one of the basic assumptions of physics. Astronomical observations provide the only means to test this basic assumption on cosmological time and distance scales. ... More
Astrophysical constraints on the proton-to-electron mass ratio with FASTApr 08 2019That the laws of physics are the same at all times and places throughout the Universe is one of the basic assumptions of physics. Astronomical observations provide the only means to test this basic assumption on cosmological time and distance scales. ... More
Reflectionless Filters for Generalized Transmission FunctionsApr 07 2019Single-ended circuit topologies, and a theorem for the development thereof, are presented with which one may realize constant-resistance (or reflectionless) filters, having ideally zero reflection coefficient at all frequencies and from all ports, suitable ... More
Bhasvati of Satananda: In the Pages of MysteryApr 07 2019Satanandacharya the astronomer and mathematician of 11th century was born in 1068 C.E. at Purusottamdham Puri of Odisha wrote the scripture Bhasvati in 1099 C.E.. The scripture has significant contribution to world of Astronomy and Mathematics. Satananda ... More
TURTLE: A C library for an optimistic stepping through a topographyApr 06 2019TURTLE is a C library providing utilities allowing to navigate through a topography described by a Digital Elevation Model (DEM). The library has been primarily designed for the Monte-Carlo transport of particles scattering over medium to long ranges, ... More
Significant improvement in the accuracy of simulated chaotic $N$-body orbits by using smoothnessApr 06 2019Symplectic integrators are a foundation to the study of dynamical $N$-body phenomena, at scales ranging from from planetary to cosmological. These integrators preserve the Poincar\'{e} invariants of Hamiltonian dynamics. The $N$-body Hamiltonian has another, ... More
Opening the low-background and high-spectral-resolution domain with the ATHENA large X-ray observatory: Development of the Cryogenic AntiCoincidence Detector for the X-ray Integral Field UnitApr 05 2019ATHENA is a large-class ESA mission selected for launch in 2031. It is designed to address the science theme "The Hot and Energetic Universe", performing X-ray observations (0.2-12 keV) at the L2 Sun-Earth Lagrangian point. The X-IFU is one of the two ... More
Experimental and theoretical studies of D + H$_3^+$ $\rightarrow$ H$_2$D$^+$ + HApr 05 2019Deuterated molecules are important chemical tracers of prestellar and protostellar cores. Up to now, the titular reaction has been assumed to contribute to the generation of these deuterated molecules. We have measured the merged-beams rate coefficient ... More
Automated Simulations of Galaxy Morphology Evolution using Deep Learning and Particle Swarm OptimisationApr 05 2019The formation of Hoag-type galaxies with central spheroidal galaxies and outer stellar rings has yet to be understood in astronomy. We consider that these unique objects were formed from the past interaction between elliptical galaxies and gas-rich dwarf ... More
The POLARBEAR Fourier Transform Spectrometer Calibrator and Spectroscopic Characterization of the POLARBEAR InstrumentApr 05 2019We describe the Fourier Transform Spectrometer (FTS) used for in-field testing of the POLARBEAR receiver, an experiment located in the Atacama Desert measuring the polarization of the cosmic microwave background (CMB). The POLARBEAR-FTS (PB-FTS) is a ... More
Radio Galaxy Zoo: Knowledge Transfer Using Rotationally Invariant Self-Organising MapsApr 05 2019With the advent of large scale surveys the manual analysis and classification of individual radio source morphologies is rendered impossible as existing approaches do not scale. The analysis of complex morphological features in the spatial domain is a ... More
Parallelized Inference for Gravitational-Wave AstronomyApr 05 2019Bayesian inference is the workhorse of gravitational-wave astronomy, for example, determining the mass and spins of merging black holes, revealing the neutron star equation of state, and unveiling the population properties of compact binaries. The science ... More
The dispersal of protoplanetary discs I: A new generation of X-ray photoevaporation modelsApr 04 2019Photoevaporation of planet forming discs by high energy radiation from the central star is potentially a crucial mechanism for disc evolution and it may play an important role in the formation and evolution of planetary system. We present here a new generation ... More
Two cold belts in the debris disk around the G-type star NZ LupApr 04 2019Planetary systems hold the imprint of the formation and of the evolution of planets especially at young ages, and in particular at the stage when the gas has dissipated leaving mostly secondary dust grains. The dynamical perturbation of planets in the ... More
Astro 2020 Science White Paper: Joint Gravitational Wave and Electromagnetic Astronomy with LIGO and LSST in the 2020'sApr 04 2019The blossoming field of joint gravitational wave and electromagnetic (GW-EM) astronomy is one of the most promising in astronomy. The first, and only, joint GW-EM event GW170817 provided remarkable science returns that still continue to this day. Continued ... More
A multi-wavelength pipeline for pulsar searchesApr 04 2019Pulsar studies in the recent years have shown, more than others, to have benefited from a multi-wavelength approach. The INAF - Astronomical Observatory in Cagliari (INAF-OAC) is a growing facility with a young group devoted to pulsar and fast transients ... More
dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and EvidencesApr 03 2019We present dynesty, a public, open-source, Python package to estimate Bayesian posteriors and evidences (marginal likelihoods) using Dynamic Nested Sampling. By adaptively allocating samples based on posterior structure, Dynamic Nested Sampling has the ... More
Diffraction-dominated observational astronomyApr 03 2019This paper is based on the opening lecture given at the 2017 edition of the Evry Schatzman school on high-angular resolution imaging of stars and their direct environment. Two relevant observing techniques: long baseline interferometry and adaptive optics ... More
Relativistic Astronomy. II. In-Flight Solution of Motion and Test of Special Relativity Light AberrationApr 03 2019The Breakthrough Starshot project aims to send centimeter-sized, gram-scale "StarChip" probes to Alpha Centauri at a speed of $\sim0.2c$. On the other hand, Zhang \& Li recently proposed that trans-relativistic cameras may be sent to any direction to ... More
Development of Spherical Proportional Counter for light WIMP search within NEWS-G collaborationApr 03 2019The Spherical gaseous detector (or Spherical Proportional Counter, SPC) has a broad range of applications. In this work, we will focus on the light WIMP Dark Matter particle search, that is, below a few GeV. The NEWS-G collaboration operates a 60 cm diameter ... More
The short wavelength instrument for the polarization explorer balloon-borne experiment: Polarization modulation issuesApr 03 2019In this paper we investigate the impact of using a polarization modulator in the Short Wavelenght Instrument for the Polarization Explorer (SWIPE) of the Large Scale Polarization Explorer (LSPE). The experiment is optimized to measure the linear polarization ... More
Kinetic Inductance Detectors and readout electronics for the OLIMPO experimentApr 03 2019Kinetic Inductance Detectors (KIDs) are superconductive low$-$temperature detectors useful for astrophysics and particle physics. We have developed arrays of lumped elements KIDs (LEKIDs) sensitive to microwave photons, optimized for the four horn-coupled ... More
Astro2020: From Stars to Compact Objects: The Initial-Final Mass RelationApr 03 2019One of the key phases of stellar evolution that remains poorly understood is stellar death. We lack a predictive model for how a star of a given mass explodes and what kind of remnant it leaves behind (i.e. the initial-final mass relation, IFMR). Progress ... More
Template Bank for Compact Binary Coalescence Searches in Gravitational Wave Data: A General Geometric Placement AlgorithmApr 02 2019We introduce an algorithm for placing template waveforms for the search of compact binary mergers in gravitational wave interferometer data. We exploit the smooth dependence of the amplitude and unwrapped phase of the frequency-domain waveform on the ... More
BICEP2 / Keck Array XI: Beam Characterization and Temperature-to-Polarization Leakage in the BK15 DatasetApr 02 2019Precision measurements of cosmic microwave background (CMB) polarization require extreme control of instrumental systematics. In a companion paper we have presented cosmological constraints from observations with the BICEP2 and Keck Array experiments ... More
Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layoutApr 02 2019The Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current ground-based instruments by a factor of five to twenty, depending on the energy, ... More
The GALANTE Photometric SystemApr 02 2019This paper describes the characterization of the GALANTE photometric system, a seven intermediate- and narrow-band filter system with a wavelength coverage from 3000 $\r{A}$ to 9000 $\r{A}$ . We describe the photometric system presenting the full sensitivity ... More
Detecting exoplanets with FAST?Apr 02 2019We briefly review the various proposed scenarios that may lead to nonthermal radio emissions from exoplanetary systems (planetary magnetospheres, magnetosphere-ionosphere and magnetosphere-satellite coupling, and star-planet interactions), and the physical ... More
The Interstellar Medium: The Key Component in Galactic Evolution and Modern CosmologyApr 02 2019The gases of the interstellar medium (ISM) possess orders of magnitude more mass than those of all the stars combined and are thus the prime component of the baryonic universe. With L-band surface sensitivity even better than the planned phase one Square-Kilometer-Array ... More
The Interstellar Medium: The Key Component in Galactic Evolution and Modern CosmologyApr 02 2019Apr 03 2019The gases of the interstellar medium (ISM) possess orders of magnitude more mass than those of all the stars combined and are thus the prime component of the baryonic universe. With L-band surface sensitivity even better than the planned phase one Square-Kilometer-Array ... More
WFIRST: The Essential Cosmology Space Observatory for the Coming DecadeApr 02 2019Two decades after its discovery, cosmic acceleration remains the most profound mystery in cosmology and arguably in all of physics. Either the Universe is dominated by a form of dark energy with exotic physical properties not predicted by standard model ... More
Filling Factors of Sunspots in SODISM ImagesApr 01 2019Received: 1st December 2018; Accepted: 18th February 2019; Published: 1st April 2019 Abstract: The calculated filling factors (FFs) for a feature reflect the fraction of the solar disc covered by that feature, and the assignment of reference synthetic ... More
The gravitational redshift monitored with RadioAstron from near Earth up to 350,000 kmApr 01 2019We report on our efforts to test the Einstein Equivalence Principle by measuring the gravitational redshift with the VLBI spacecraft RadioAstron, in an eccentric orbit around Earth with geocentric distances as small as $\sim$ 7,000 km and up to 350,000 ... More
Simulated neutrino signals of low and intermediate energy neutrinos on Cd detectorsApr 01 2019Neutrino-nucleus reactions cross sections, obtained for neutrino energies in the range $\varepsilon_{\nu}\leq 100-120$ MeV (low- and intermediate-energy range), which refer to promising neutrino detection targets of current terrestrial neutrino experiments, ... More
SiPMs for cryogenic temperatureApr 01 2019The DarkSide-20k collaboration is preparing to equip 20 m^2 of SiPMs working in liquid argon at 86 K for the direct search of WIMPs. The collaboration had to solve many technological aspects, such as the development of SiPM optimized for operation in ... More
Polca SARA - Full polarization, direction-dependent calibration and sparse imaging for radio interferometryApr 01 2019New generation of radio interferometers are envisaged to produce high quality, high dynamic range Stokes images of the observed sky from the corresponding under-sampled Fourier domain measurements. In practice, these measurements are contaminated by the ... More
Iridium Satellite Signals: A Case Study in Interference Characterization and Mitigation for Radio Astronomy ObservationsMar 31 2019Several post-detection approaches to the mitigation of radio-frequency interference (RFI) are compared by applying them to the strong RFI from the Iridium satellites. These provide estimates for the desired signal in the presence of RFI, by exploiting ... More
First results from the CRESST-III low-mass dark matter programMar 31 2019The CRESST experiment is a direct dark matter search which aims to measure interactions of potential dark matter particles in an earth-bound detector. With the current stage, CRESST-III, we focus on a low energy threshold for increased sensitivity towards ... More
GNC Challenges and Opportunities of CubeSat Science Missions Deployed from the Lunar GatewayMar 31 2019The Lunar Gateway is expected to be positioned on-orbit around the Moon or in a Halo orbit at the L2 Lagrange point. The proposed Lunar Gateway is a game-changer for enabling new, high-priority lunar science utilizing Cu-beSats and presents a refreshing ... More
Blind correction of the EB-leakage in the pixel domainMar 31 2019We study the problem of EB-leakage that is associated with incomplete polarized CMB sky. In the blind case that assumes no additional information about the statistical properties and amplitudes of the signal from the missing sky region, we prove that ... More
Simulating the optical alignment of the multiconjugate adaptive optics module for the extremely large telescopeMar 30 2019Adaptive optics (AO) instruments for the future extremely large telescopes (ELTs) are characterized by advanced optical systems with diffraction-limited optical quality. Low geometric distortion is also crucial for high accuracy astrometric applications. ... More
Excitation and charge transfer in low-energy hydrogen atom collisions with neutral carbon and nitrogenMar 30 2019Low-energy inelastic collisions with neutral hydrogen atoms are important processes in stellar atmospheres, and a persistent source of uncertainty in non-LTE modelling of stellar spectra. We calculate and study excitation and charge transfer of C i and ... More
COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective modelsMar 30 2019Assuming a standard Maxwellian for the WIMP velocity distribution, we obtain the bounds from null WIMP search results of 59.5 days of COSINE-100 data on the DAMA/LIBRA-phase2 modulation effect within the context of the non-relativistic effective theory ... More
A Space-based Decametric Wavelength Radio Telescope ConceptMar 30 2019This paper reports a design study for a space-based decametric wavelength telescope. While not a new concept, this design study focused on many of the operational aspects that would be required for an actual mission. This design optimized the number of ... More