Latest in astro-ph.sr

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Novel Techniques for Constraining Neutron-Capture Rates Relevant for r-Process Heavy-Element NucleosynthesisApr 22 2019The rapid-neutron capture process ($r$ process) is identified as the producer of about 50\% of elements heavier than iron. This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time ($\sim$ seconds), ... More
Analytic computation of the secular effects of encounters on a binary: features arising from second-order perturbation theoryApr 21 2019Binary-single interactions play a crucial role in the evolution of dense stellar systems such as globular clusters. In addition, they are believed to drive black hole (BH) binary mergers in these systems. A subset of binary-single interactions are secular ... More
The Nucleosynthesis and Reaction Rates of Fluorine 19 ($^{19}F$) in the SunApr 21 2019We investigate the abundance of $^{19}F$ in the Sun through the nucleosynthesis scenario. In addition, we calculate the rate equations and reaction rates of the nucleosynthesis of $^{19}F$ at different temperature scale. Other important functions of this ... More
The Stellar CME-flare relation: What do historic observations reveal?Apr 21 2019Solar CMEs and flares have a statistically well defined relation, with more energetic X-ray flares corresponding to faster and more massive CMEs. How this relation extends to more magnetically active stars is a subject of open research. Here, we study ... More
Spectropolarimetric analysis of an active region filament. I. Magnetic and dynamical properties from single component inversionsApr 21 2019The determination of the magnetic filed vector in solar filaments is possible by interpreting the Hanle and Zeeman effects in suitable chromospheric spectral lines like those of the He I multiplet at 10830 A. We study the vector magnetic field of an active ... More
First astrophysical detection of the helium hydride ion (HeH$^+$)Apr 21 2019During the dawn of chemistry when the temperature of the young Universe had fallen below $\sim$4000 K, the ions of the light elements produced in Big Bang nucleosynthesis recombined in reverse order of their ionization potential. With its higher ionization ... More
3D reconstructions of EUV wave front heights and their influence on wave kinematicsApr 20 2019EUV waves are large-scale disturbances in the solar corona initiated by coronal mass ejections. However, solar EUV images show only the wave fronts projections along the line-of-sight of the spacecraft. We perform 3D reconstructions of EUV wave front ... More
New powerful outburst of the unusual young star V1318 Cyg S (LkHα 225)Apr 20 2019Young double star V1318 Cyg, which is associated with a small isolated star-forming region around HAeBe star BD+40o4124, has very unusual photometric and spectral behavior. We present results of photometric and spectroscopic observations in the optical ... More
A survey of C2H, HCN, and C18O in protoplanetary disksApr 19 2019Molecular lines observed towards protoplanetary disks carry information about physical and chemical processes associated with planet formation. We present ALMA Band 6 observations of C2H, HCN, and C18O in a sample of 14 disks spanning a range of ages, ... More
Line Ratios Reveal N2H+ Emission Originates Above the Midplane in TW HydraeApr 19 2019Line ratios for different transitions of the same molecule have long been used as a probe of gas temperature. Here we use ALMA observations of the N2H+ J~=~1-0 and J~=~4-3 lines in the protoplanetary disk around TW Hya to derive the temperature at which ... More
Common Envelope Evolution on a Moving MeshApr 19 2019We outline the methodology of simulating common envelope evolution (CEE) with the moving-mesh code MANGA. We extend MANGA to include multiple time-steps. This provides substantial speedups for problems with large dynamic range. We describe the implementation ... More
Effects of winds on the leftover hydrogen in massive stars following Roche-lobe overflowApr 19 2019We find that applying a theoretical wind mass-loss rate from Monte Carlo radiative transfer models for hydrogen-deficient stars results in significantly more leftover hydrogen following stable mass transfer through Roche-lobe overflow than when we use ... More
Non-thermal X-rays from Colliding Wind Shock Acceleration in the Massive Binary Eta CarinaeApr 19 2019Cosmic-ray acceleration has been a long-standing mystery and despite more than a century of study, we still do not have a complete census of acceleration mechanisms. The collision of strong stellar winds in massive binary systems creates powerful shocks, ... More
New insight on Young Stellar Objects accretion shocks - a claim for NLTE opacities -Apr 19 2019Context. Accreted material onto CTTSs is expected to form a hot quasi-periodic plasma structure that radiates in X-rays. Simulations of this phenomenon only partly match with observations. They all rely on the assumption that radiation and matter are ... More
Chromospheric polarimetry through multi-line observations of the 850 nm spectral region III: Chromospheric jets driven by twisted magnetic fieldsApr 19 2019We investigate the diagnostic potential of the spectral lines at 850 nm for understanding the magnetism of the lower atmosphere. For that purpose, we use a newly developed 3D simulation of a chromospheric jet to check the sensitivity of the spectral lines ... More
Unexpectedly strong effect of supergranulation on the detectability of Earth twins orbiting Sun-like stars with radial velocitiesApr 19 2019Magnetic activity and surface flows at different scales pertub radial velocity measurements. This affects the detectability of low-mass exoplanets. In these flows, the effect of supergranulation is not as well characterized as the other flows, and we ... More
Parameter Estimation for Scarce Stellar PopulationsApr 19 2019We present a Bayesian method to determine simultaneously the age, metallicity, distance modulus, and interstellar reddening by dust of any resolved stellar population, by comparing the observed and synthetic color magnitude diagrams on a star by star ... More
Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary DiskApr 18 2019We analyze the highest-resolution millimeter continuum and near-infrared (NIR) scattered-light images presented to date of the circumbinary disk orbiting V4046 Sgr, a ~20 Myr old actively accreting, close binary T Tauri star system located a mere 72.4 ... More
Observations of Solar Coronal Rain in Null Point TopologiesApr 18 2019Coronal rain is the well-known phenomenon in which hot plasma high in the Sun's corona undergoes rapid cooling (from > 10^6 K to < 10^4 K), condenses, and falls to the surface. Coronal rain appears frequently in active region coronal loops and is very ... More
Atomic Modeling of Photoionization Fronts in Nitrogen GasApr 18 2019Photoionization fronts play a dominant role in many astrophysical environments, but remain difficult to achieve in a laboratory experiment. Recent papers have suggested that experiments using a nitrogen medium held at ten atmospheres of pressure that ... More
Non-ideal MHD simulation of HL Tau disk: formation of ringsApr 18 2019Recent high resolution observations unveil ring structures in circumstellar disks. The origin of these rings has been widely investigated under various theoretical scenarios. In this work we perform global 3D non-ideal MHD simulations including effects ... More
Modelling the periodical variations in multiband polarisation and photometry for discs of binary Be starsApr 18 2019The tidal interaction of a Be star with a binary companion forms two spiral arms that cause orbital modulation of the Be disc structure. The aim of this work is to identify observables in which this modulation is apparent. The structure of a Be disc in ... More
The accelerating rotation of the magnetic He-weak star HD 142990Apr 18 2019HD 142990 (V 913 Sco; B5 V) is a He-weak star with a strong surface magnetic field and a short rotation period ($P_{\rm rot} \sim 1$ d). While it is clearly a rapid rotator, recent determinations of $P_{\rm rot}$ are in formal disagreement. In this paper ... More
Cool spots on the surface of the active giant PZ MonApr 18 2019Based on the multiband (BVRIJHKL) photometric observations of the active red giant PZ Mon performed for the first time in the winter season of 2017-2018, we have determined the main characteristics of the spotted stellar surface in a parametric three-spot ... More
Damping of Propagating Kink Waves in the Solar CoronaApr 18 2019Alfv\'enic waves have gained renewed interest since the existence of ubiquitous propagating kink waves were discovered in the corona. {It has long been suggested that Alfv\'enic} waves play an important role in coronal heating and the acceleration of ... More
Anomalous Cepheids discovered in a sample of Galactic short period Type II CepheidsApr 18 2019We revisited the short period Type II Cepheids (T2Cs), called the BL Herculis (BLHs), in the Galactic Field to derive a homogeneous analysis of their Fourier parameters. Only V-band data were compiled to make sure that it was directly comparable between ... More
Why do some probabilistic forecasts lack reliability?Apr 18 2019In this work, we investigate the reliability of the probabilistic binary forecast. We mathematically prove that a necessary, but not sufficient, condition for achieving a reliable probabilistic forecast is maximizing the Peirce skill score (PSS) at the ... More
Spot evolution on LQ Hya during 2006--2017: temperature maps based on SOFIN and FIES dataApr 18 2019Context. LQ Hya is one of the most frequently studied young solar analogue stars. Recently, it has been observed to show intriguing behaviour by analysing long-term photometry: during 2003--2009, a coherent spot structure migrating in the rotational frame ... More
Collisionless Energy Transfer in Kinetic Turbulence: Field-Particle Correlations in Fourier SpaceApr 18 2019Turbulence is commonly observed in nearly collisionless heliospheric plasmas, including the solar wind and corona and the Earth's magnetosphere. Understanding the collisionless mechanisms responsible for the energy transfer from the turbulent fluctuations ... More
Uncovering Red and Dusty Ultraluminous X-ray Sources with SpitzerApr 18 2019We present a mid-infrared (IR) sample study of nearby ultraluminous X-ray sources (ULXs) using multi-epoch observations with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. Spitzer/IRAC observations taken after 2014 were obtained as part ... More
Supergranular turbulence in a quiet Sun: Lagrangian coherent structuresApr 17 2019The quiet Sun exhibits a wealth of magnetic activities that are fundamental for our understanding of solar and astrophysical magnetism. The magnetic fields in the quiet Sun are observed to evolve coherently, interacting with each other to form distinguished ... More
Astro2020 Science White Paper: The Formation and Evolution of Multiple Star SystemsApr 17 2019Significant advances have been made over the past decade in the characterization of multiple protostar systems, enabled by the Karl G. Jansky Very Large Array (VLA), high-resolution infrared observations with the Hubble Space Telescope, and ground-based ... More
A New Radio Molecular Line Survey of Planetary Nebulae: HNC/HCN as a Diagnostic of Ultraviolet IrradiationApr 17 2019Certain planetary nebulae contain shells, filaments, or globules of cold gas and dust whose heating and chemistry are likely driven by UV and X-ray emission from their central stars and from wind-collision-generated shocks. We present the results of a ... More
Disc Tearing and Bardeen-Petterson Alignment in GRMHD Simulations of Highly Tilted Thin Accretion DiscsApr 17 2019Luminous active galactic nuclei (AGN) and X-Ray binaries (XRBs) tend to be surrounded by geometrically thin, radiatively cooled accretion discs. According to both theory and observations, these are -- in many cases -- highly misaligned with the black ... More
Jet-cocoon outflows from neutron star mergers: structure, light curves, and fundamental physicsApr 17 2019The discovery of GW170817, the merger of a binary neutron star (NS) triggered by a gravitational wave detection by LIGO and Virgo, has opened a new window of exploration in the physics of NSs and their cosmological role. Among the important quantities ... 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
Peculiarities of the Dynamics of Solar NOAA Active Region 12673Apr 17 2019The dynamics of active region (AR) 12673 is qualitatively studied using observational data obtained with the Helioseismic and Magnetic Imager of the Solar Dynamics Observatory on August 31--September 8, 2017. This AR was remarkable for its complex structure ... More
Detection of coherent emission from the Bp star HD 142990 at uGMRT frequenciesApr 17 2019HD 142990 is a Bp-type star with a nearly dipolar surface magnetic field of kG strength. Recently Lenc et al. (2018) reported the tentative discovery of Electron Cyclotron Maser Emission (ECME) from this star at 200 MHz. This type of emission has been ... More
The long term polarimetric variability of the strongly magnetic white dwarf Grw+70$^\circ$8247Apr 17 2019Some of the white dwarfs exhibit among the strongest magnetic fields in the universe. Many of these degenerate magnetic stars are also rotating very slowly. Among these objects, Grw+70$^\circ$\,8247, with its century-long suspected rotation period and ... More
Radio observations of evaporating objects in the Cygnus OB2 regionApr 17 2019We present observations of the Cygnus OB2 region obtained with the Giant Metrewave Radio Telescope (GMRT) at the frequencies of 325 MHz and 610 MHz. In this contribution we focus on the study of proplyd-like objects (also known as free-floating Evaporating ... More
Stellar activity and planetary atmosphere evolution in tight binary star systemsApr 17 2019Context. In tight binary star systems, tidal interactions can significantly influence the rotational and orbital evolution of both stars, and therefore their activity evolution. This can have strong effects on the atmospheric evolution of planets that ... More
Predicting relationships between solar jet variablesApr 17 2019Studies of spicules and similar solar jets have revealed a strong correlation between some of the kinematic variables, particularly between the initial velocity V, and the subsequent deceleration, a. It has been proposed that this is caused by, and offers ... More
Role of magnetic field curvature in magnetohydrodynamic turbulenceApr 17 2019Magnetic field are transported and tangled by turbulence, even as they lose identity due to nonideal or resistive effects. On balance field lines undergo stretch-twist-fold processes. The curvature field, a scalar that measures the tangling of the magnetic ... More
Scattering of Strahl Electrons in the Solar Wind between 0.3 and 1 au: Helios ObservationsApr 17 2019Electron velocity distribution functions in the solar wind according to standard models consist of 4 components, of which 3 are symmetric - the core, the halo, and the superhalo, and one is magnetic field-aligned, beam-like population, referred to as ... More
Heliospheric Evolution of Magnetic CloudsApr 17 2019Interplanetary evolution of eleven magnetic clouds (MCs) recorded by at least two radially aligned spacecraft is studied. The in situ magnetic field measurements are fitted to a cylindrically symmetric Gold-Hoyle force-free uniform-twist flux-rope configuration. ... More
ALMA Solar Ephemeris GeneratorApr 17 2019An online software tool for the easy preparation of ephemerides of the solar surface features is presented. It was developed as a helper tool for the preparation of observations of the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA), ... More
OGLE-ing the Magellanic System: Cepheids in the BridgeApr 17 2019We present a detailed analysis of Magellanic Bridge Cepheid sample constructed using the OGLE Collection of Variable Stars. Our updated Bridge sample contains 10 classical and 13 anomalous Cepheids. We calculate their individual distances using optical ... More
Light Curve Parameters of Cepheid and RR Lyrae Variables at Multiple Wavelengths $-$ Models vs. ObservationsApr 17 2019We present results from a comparative study of light curves of Cepheid and RR Lyrae stars in the Galaxy and the Magellanic Clouds with their theoretical models generated from the stellar pulsation codes. Fourier decomposition method is used to analyse ... More
AT 2017fvz: a nova in the dwarf irregular galaxy NGC 6822Apr 17 2019A transient in the Local Group dwarf irregular galaxy NGC 6822 (Barnard's Galaxy) was discovered on 2017 August 2 and is only the second classical nova discovered in that galaxy. We conducted optical, near-ultraviolet, and X-ray follow-up observations ... More
Evolution of young protoclusters embedded in dense massive clumps. A new grid of population synthesis SED models and a new set of L/M evolutionary tracksApr 17 2019A grid of 20 millions 3-1100$\mu$m SED models is presented for synthetic young clusters embedded in dense clumps. The models depend on four primary parameters: the clump mass M$_{clump}$ and dust temperature T$_{dust}$, the fraction of mass f$_{core}$ ... More
The period-luminosity relation for delta Scuti stars using Gaia DR2 parallaxesApr 17 2019We have examined the period-luminosity (P-L) relation for delta Scuti stars using Gaia DR2 parallaxes. We included 228 stars from the catalogue of Rodriguez et al. (2000), as well as 1124 stars observed in the four-year Kepler mission. For each star we ... More
A massive nebula around the Luminous Blue Variable star RMC143 revealed by ALMAApr 16 2019The Luminous Blue Variable (LBV) RMC143 is located in the outskirts of the 30~Doradus complex, a region rich with interstellar material and hot luminous stars. We report the $3\sigma$ sub-millimeter detection of its circumstellar nebula with ALMA. The ... More
The Tail of PSR J0002+6216 and the Supernova Remnant CTB 1Apr 16 2019We have carried out VLA imaging and a Fermi timing analysis of the 115 ms gamma-ray and radio pulsar PSR J0002+6216. We found that the pulsar lies at the apex of a narrowly collimated cometary-like 7 arcmin tail of non-thermal radio emission which we ... More
Testing asteroseismology with Gaia DR2: Hierarchical models of the Red ClumpApr 16 2019Apr 18 2019Asteroseismology provides fundamental stellar parameters independent of distance, but subject to systematics under calibration. Gaia DR2 has provided parallaxes for a billion stars, which are offset by a parallax zero-point. Red Clump (RC) stars have ... More
Testing asteroseismology with Gaia DR2: Hierarchical models of the Red ClumpApr 16 2019Asteroseismology provides fundamental stellar parameters independent of distance, but subject to systematics under calibration. Gaia DR2 has provided parallaxes for a billion stars, which are offset by a parallax zero-point. Red Clump (RC) stars have ... 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
OGLE-ing the Magellanic System: RR Lyrae Stars in the BridgeApr 16 2019We use the extended and updated OGLE Collection of Variable Stars to thoroughly analyze distribution of RR Lyrae stars in the Magellanic Bridge. We use photometric metallicities to derive absolute Wesenheit magnitude and then individual distance of each ... More
The Relationship Between Globular Cluster Mass, Metallicity, and Light Element Abundance VariationsApr 16 2019We investigate aluminum abundance variations in the stellar populations of globular clusters using both literature measurements of sodium and aluminum and APOGEE measurements of nitrogen and aluminum abundances. For the latter, we show that the Payne ... More
The X-ray binary GX 339-4/V821 Ara: the distance, inclination, evolutionary status and mass transferApr 16 2019We consider constraints on the distance, inclination and component masses in the X-ray binary GX 339--4 resulting from published works, and then construct detailed evolutionary models for the donor. From both considerations, we find that unless the compact ... More
Constraining the masses of microlensing black holes and the mass gap with Gaia DR2Apr 16 2019Context: Gravitational microlensing is sensitive to compact-object lenses in the Milky Way, including white dwarfs, neutron stars or black holes, and could potentially probe a wide range of stellar remnant masses. However, the mass of the lens can be ... More
Infrared dust arcs around the stars: I. effect of the radiation pressureApr 16 2019In this paper we consider the distribution of the interstellar dust in the vicinity of the star under an influence of the stellar gravitation and radiation pressure. This study is applicable to the stars with relatively weak stellar wind and strong radiation, ... More
OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensingApr 16 2019We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 $Spitzer$ microlensing campaign. This event is remarkable because its source is photometrically variable. We perform an asteroseismic analysis of the source star and find that it is ... More
Thermonuclear oubursts of AM CVn starsApr 16 2019We consider initial stage of the evolution of AM CVn type stars with white dwarf donors, which is accompanied by thermonuclear explosions in the layer of accreted He. It is shown that the accretion never results in detonation of He and accretors in AM ... More
Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismologyApr 16 2019An increasing number of white dwarf stars show atmospheric chemical composition polluted by heavy elements accreted from debris disk material. The existence of such debris disks strongly suggests the presence of one or more planet(s) whose gravitational ... More
Isocyanogen formation in the cold interstellar mediumApr 16 2019Cyanogen (NCCN) is the simplest member of the dicyanopolyynes group, and has been proposed as a major source of the CN radical observed in cometary atmospheres. Although not detected through its rotational spectrum in the cold interstellar medium, this ... More
Cooling of the Cassiopeia A neutron star and the effect of diffusive nuclear burningApr 16 2019The study of how neutron stars cool over time can provide invaluable insights into fundamental physics such as the nuclear equation of state and superconductivity and superfluidity. A critical relation in neutron star cooling is the one between observed ... More
The lowest detected stellar Fe abundance: The halo star SMSS J160540.18-144323.1Apr 16 2019We report the discovery of SMSS J160540.18-144323.1, a new ultra-metal poor halo star discovered with the SkyMapper telescope. We measure [Fe/H] = -6.2 +- 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbon-enhanced, ... More
Why Does the Solar Corona Abnormally Rotate Faster Than the Photosphere?Apr 16 2019Coronal heating is a big question for modern astronomy. Daily measurement of 985 solar spectral irradiances (SSIs) at the spectral intervals 1-39 nm and 116-2416 nm during March 1 2003 to October 28 2017 is utilized to investigate characteristics of solar ... More
A strange phenomenon of XZ Andromedae: two Keplerian periods with a 1:3 ratioApr 16 2019Six mid-eclipse times of the eclipsing binary XZ And are obtained, which are analysed together with others collected from the literature. Two sets of cyclic variations with periods of 33.43 and 100.4 yr are found if a double-Keplerian model is used to ... More
The Pulsating Eclipsing Binary TIC 309658221 in a 7.59 Day OrbitApr 15 2019We present a new eclipsing binary (EB) showing multiperiodic oscillations using the first three sectors of {\it TESS} photometry. The eclipse and pulsation light curves of TIC 309658221 were modeled using an iterative method to obtain a consistent photometric ... More
Excitation of Planetary Obliquities Through Planet-Disk InteractionsApr 15 2019The tilt of a planet's spin axis off its orbital axis ("obliquity") is a basic physical characteristic that plays a central role in determining the planet's global circulation and energy redistribution. Moreover, recent studies have also highlighted the ... More
Using the infrared iron lines to probe solar subsurface convectionApr 15 2019Studying the properties of the solar convection using high-resolution spectropolarimetry began in the early 90's with the focus on observations in the visible wavelength regions. Its extension to the infrared (IR) remains largely unexplored. The IR iron ... More
The effects of numerical resolution, heating timescales and background heating on thermal non-equilibrium in coronal loopsApr 15 2019Thermal non-equilibrium (TNE) is believed to be a potentially important process in understanding some properties of the magnetically closed solar corona. Through one-dimensional hydrodynamic models, this paper addresses the importance of the numerical ... More
APEX Observations of the CO Envelope around the Young FUor-type Star V883 OriApr 15 2019The accretion-driven outbursts of young FU Orionis-type stars may be a common stage of pre-main sequence evolution and can have a significant impact on the circumstellar environment as it pertains to the growth of solids and eventually planets. This episodic ... More
Disc formation and fragmentation using radiative non-ideal magnetohydrodynamicsApr 15 2019We investigate the formation and fragmentation of discs using a suite of three-dimensional smoothed particle radiative magnetohydrodynamics simulations. Our models are initialised as 1M$_\odot$ rotating Bonnor-Ebert spheres that are threaded with a uniform ... More
Discovery of an intermediate-luminosity red transient in M51 and its likely dust-obscured, infrared-variable progenitorApr 15 2019We present the discovery of an optical transient (OT) in Messier 51, designated M51 OT2019-1 (also ZTF 19aadyppr, AT 2019abn, ATLAS19bzl), by the Zwicky Transient Facility (ZTF). The OT rose over 15 days to an observed plateau luminosity of $M_r=-13$, ... More
ACRONYM III: Radial Velocities for 336 Candidate Young Low-Mass Stars in the Solar Neighborhood, Including 78 Newly Confirmed Young Moving Group MembersApr 15 2019Young, low-mass stars in the solar neighborhood are vital for completing the mass function for nearby, young coeval groups, establishing a more complete census for evolutionary studies, and providing targets for direct-imaging exoplanet and/or disk studies. ... More
Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the modelsApr 15 2019Lee & Song (2018, Paper 1) developed a tool for calculating Bayesian membership probability for nearby young stellar moving groups (BAMG: Bayesian Analysis of Moving Groups). The study presented the importance of careful construction of models in moving ... More
ALMA monitoring of mm line variation in IRC+10216: I. Overview of millimeter variabilityApr 15 2019Temporal variation of millimeter lines is a new direction of research for evolved stars. It has the potential to probe the dynamical wind launching processes from time dimension. We report here the first results that cover the past 817 days of an on-going ... More
Improvements of the longitudinal magnetic field measurement at the HSOS/SMFTApr 15 2019Apr 16 2019The weak-field approximation implying linear relationship between Stokes $V/I$ and longitudinal magnetic field, $B_z$, often suffers from the saturation observed in strong magnetic field regions such as sunspot umbra. In this work we intend improve the ... More
Improvements of the longitudinal magnetic field measurement at the HSOS/SMFTApr 15 2019The weak-field approximation implying linear relationship between Stokes $V/I$ and longitudinal magnetic field, $B_z$, often suffers from the saturation observed in strong magnetic field regions such as sunspot umbra. In this work we intend to improve ... More
Observation-based modelling of magnetised Coronal Mass Ejections with EUHFORIAApr 15 2019Coronal Mass Ejections (CMEs) are the primary source of strong space weather disturbances at Earth. Their geoeffectiveness is largely determined by their dynamic pressure and internal magnetic fields, for which reliable predictions at Earth are not possible ... More
Probing the production of actinides under different r-process conditionsApr 15 2019Several extremely metal-poor stars are known to have an enhanced thorium abundance. These actinide-boost stars have likely inherited material from an r-process that operated under different conditions than the most frequent r-process in the galaxy. In ... More
Constraining the neutron star equation of state using Pulse Profile ModelingApr 15 2019One very promising technique for measuring the dense matter Equation of State exploits hotspots that form on the neutron star surface due to the pulsar mechanism, accretion streams, or during thermonuclear explosions in the neutron star ocean. This article ... More
Revealing the Two `Horns' of Taurus with GAIA DR2Apr 15 2019In this Letter we investigate the spatial properties of sources from the GAIA catalogue previously identified as being members of the Taurus star forming region and which appear in the Spitzer catalogue. We study an area of sky of 10x15 deg, centred on ... More
Revealing the Two `Horns' of Taurus with GAIA DR2Apr 15 2019Apr 16 2019In this Letter we investigate the spatial properties of sources from the GAIA catalogue previously identified as being members of the Taurus star forming region and which appear in the Spitzer catalogue. We study an area of sky of 10x15 deg, centred on ... More
The Sejong Open cluster Survey (SOS) VI. A small star-forming region in the high Galactic latitude molecular cloud MBM 110Apr 15 2019We present optical photometric, spectroscopic data for the stars in the high Galactic latitude molecular cloud MBM 110. For the complete membership selection of MBM 110, we also analyze WISE mid-infrared data and Gaia astrometric data. Membership of individual ... More
Observation of a possible superflare on Proxima CentauriApr 15 2019We report the observation on UT 2017.07.01 of an unusually powerful flare detected in near-infrared continuum photometry of Proxima Centauri. During a campaign monitoring the star for possible exoplanet transits, we identified an increase in Sloan i' ... More
On period distribution of RR Lyr type variables in the globular cluster M3Apr 15 2019Evolutionary calculations of population II stars with chemical composition of the globular cluster M3 were carried out under various assumptions about the initial stellar mass ($0.809M_\odot\le M_\mathrm{ZAMS} \le 0.83M_\odot$) and the mass loss rate ... More
Discovery of six new class II methanol maser transitions, including the unambiguous detection of three torsionally excited lines toward G358.931-0.030Apr 15 2019We present the unambiguous discovery of six new class II methanol maser transitions, three of which are torsionally excited (vt=1). The newly discovered 6.18-GHz 17_-2 -> 18_-3 E (vt=1), 7.68-GHz 12_4 -> 13_3 A- (vt=0), 7.83-GHz 12_4 -> 13_3 A+ (vt = ... More
Latest advances in the abundance discrepancy problem in photoionized nebulaeApr 14 2019In this paper, we will focus on the advances made in the last few years regarding the abundance discrepancy problem in ionized nebulae. We will show the importance of collecting deep, high-quality data of H II regions and planetary nebulae taken with ... More
The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic CloudsApr 14 2019The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as ... More
Observations of small-scale energetic events in the solar transition region: explosive events, UV bursts and network jetsApr 14 2019In this paper, we review observational aspects of three common small-scale energetic events in the solar transition region (TR), namely: TR explosive events, ultraviolet bursts and jets. These events are defined in either (both) spectral or (and) imaging ... More
Supernova 2018aoq and a distance to Seyfert galaxy NGC 4151Apr 13 2019We present optical photometric observations of SN 2018aoq from 2 to 100 days after explosion, and 7 spectra at epochs from 11 to 71 days. The light curves and spectra are typical for SNe II-P. As previously reported, SN 2018aoq appears to be of intermediate ... More
Spectroscopic orbits of nearby starsApr 13 2019We observed stars with variable radial velocities to determine their spectroscopic orbits. Velocities of 132 targets taken over a time span reaching 30 years are presented. They were measured with the correlation radial velocity spectrometers (1913 velocities) ... More
The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Disk Dust Mass Distributions across Protostellar Evolutionary ClassesApr 13 2019As protostars evolve from optically faint / infrared bright (Class I) sources to optically bright / infrared faint (Class II) the solid material in their surrounding disks accumulates into planetesimals and protoplanets. The nearby, young Ophiuchus star-forming ... More
On the Mass Function, Multiplicity, and Origins of Wide-Orbit Giant PlanetsApr 12 2019A major outstanding question regarding the formation of planetary systems is whether wide-orbit giant planets form differently than close-in giant planets. We aim to establish constraints on two key parameters that are relevant for understanding the formation ... More
On the Mass Function, Multiplicity, and Origins of Wide-Orbit Giant PlanetsApr 12 2019Apr 16 2019A major outstanding question regarding the formation of planetary systems is whether wide-orbit giant planets form differently than close-in giant planets. We aim to establish constraints on two key parameters that are relevant for understanding the formation ... More
The Inner Disk and Accretion Flow of the Close Binary DQ TauApr 12 2019We present multi-epoch optical and near-infrared (NIR) photometry and spectroscopy of the spectroscopic binary T Tauri star DQ Tau. The photometric monitoring, obtained using SMARTS ANDICAM, recovers the previously-seen correlation between optical flux ... More