Results for "Stephen Kane"

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Detectability of Exoplanetary Transits from Radial Velocity SurveysJun 25 2007Sep 16 2007Of the known transiting extra-solar planets, a few have been detected through photometric follow-up observations of radial velocity planets. Perhaps the best known of these is the transiting exoplanet HD 209458b. For hot Jupiters (periods less than ~5 ... More
Detecting the Signatures of Uranus and NeptuneApr 26 2011With more than 15 years since the the first radial velocity discovery of a planet orbiting a Sun-like star, the time baseline for radial velocity surveys is now extending out beyond the orbit of Jupiter analogs. The sensitivity to exoplanet orbital periods ... More
Resolving Close Encounters: Stability in the HD 5319 and HD 7924 Planetary SystemsAug 08 2016Sep 23 2016Radial velocity searches for exoplanets have detected many multi-planet systems around nearby bright stars. An advantage of this technique is that it generally samples the orbit outside of inferior/superior conjunction, potentially allowing the Keplerian ... More
Stability of Earth-mass Planets in the Kepler-68 SystemNov 09 2015Sep 08 2016A key component of characterizing multi-planet exosystems is testing the orbital stability based on the observed properties. Such characterization not only tests the validity of how observations are interpreted but can also place additional constraints ... More
Completeness of Imaging Surveys for Eccentric ExoplanetsJan 31 2013Feb 18 2013The detection of exoplanets through direct imaging has produced numerous new positive identifications in recent years. The technique is biased towards planets at wide separations due to the difficulty in removing the stellar signature at small angular ... More
Habitable Zone Dependence on Stellar Parameter UncertaintiesJan 14 2014An important property of exoplanetary systems is the extent of the Habitable Zone (HZ), defined as that region where water can exist in a liquid state on the surface of a planet with sufficient atmospheric pressure. Both ground and space-based observations ... More
Possible Detection of a Higgs Boson at Higher Luminosity Hadron CollidersJun 18 1994We have examined how a Standard Model or Supersymmetric Higgs boson h might be detected at possible hadron colliders. The channels W(to ell nu)h(to b b~), Z(to ell ell~)h(to b b~) and W/Z(to jets)h(to tau+ tau-) are most useful. The results imply that ... More
A Necro-Biological Explanation for the Fermi ParadoxMar 31 2014Apr 29 2014As we learn more about the frequency and size distribution of exoplanets, we are discovering that terrestrial planets are exceedingly common. The distribution of orbital periods in turn results in many of these planets being the occupants of the Habitable ... More
Transiting Planet Simulations from the All Sky Extrasolar Planets SurveyDec 28 2006Many of the planets discovered via the radial velocity technique are hot Jupiters in 3-5 day orbits with ~10$% chance of transiting their parent star. However, radial velocity surveys for extra-solar planets generally require substantial amounts of large ... More
Representing Sets with Sums of Triangular NumbersMar 17 2009We investigate here sums of triangular numbers $f(x):=\sum_i b_i T_{x_i}$ where $T_n$ is the $n$-th triangular number. We show that for a set of positive integers $S$ there is a finite subset $S_0$ such that $f$ represents $S$ if and only if $f$ represents ... More
On the Inclination and Habitability of the HD 10180 SystemAug 18 2014There are numerous multi-planet systems that have now been detected via a variety of techniques. These systems exhibit a range of both planetary properties and orbital configurations. For those systems without detected planetary transits, a significant ... More
Orbital Dynamics of Multi-Planet Systems with Eccentricity DiversityJan 30 2014Feb 08 2014Since exoplanets were detected using the radial velocity method, they have revealed a diverse distribution of orbital configurations. Amongst these are planets in highly eccentric orbits (e > 0.5). Most of these systems consist of a single planet but ... More
Transit Detection of Radial Velocity PlanetsJun 30 2008The orbital parameters of extra-solar planets have a significant impact on the probability that the planet will transit the host star. This was recently demonstrated by the transit detection of HD 17156b whose favourable eccentricity and argument of periastron ... More
On the Inclination Dependence of Exoplanet Phase SignaturesJan 05 2011Improved photometric sensitivity from space-based telescopes have enabled the detection of phase variations for a small sample of hot Jupiters. However, exoplanets in highly eccentric orbits present unique opportunities to study the effects of drastically ... More
Phase Curves of the Kepler-11 Multi-Planet SystemApr 29 2014The Kepler mission has allowed the detection of numerous multi-planet exosystems where the planetary orbits are relatively compact. The first such system detected was Kepler-11 which has six known planets at the present time. These kinds of systems offer ... More
The Habitable Zone and Extreme Planetary OrbitsMay 11 2012The Habitable Zone for a given star describes the range of circumstellar distances from the star within which a planet could have liquid water on its surface, which depends upon the stellar properties. Here we describe the development of the Habitable ... More
Photometric Phase Variations of Long-Period Eccentric PlanetsSep 24 2010The field of exoplanetary science has diversified rapidly over recent years as the field has progressed from exoplanet detection to exoplanet characterization. For those planets known to transit, the primary transit and secondary eclipse observations ... More
Studying the Galactic Bulge Through Spectroscopy of Microlensed Sources: II. ObservationsJan 06 2001Sep 18 2002The spectroscopy of microlensed sources towards the Galactic bulge provides a unique opportunity to study (i) the kinematics of the Galactic bulge, particularly its far-side, (ii) the effects of extinction on the microlensed sources, and (iii) the contributions ... More
Studying the Galactic Bulge Through Spectroscopy of Microlensed Sources: I. Theoretical ConsiderationsNov 21 2000Oct 01 2005The observed spectra of the microlensed sources towards the Galactic bulge may be used as a tool for studying the kinematics and extinction effects in the Galactic bulge. In this paper, we first investigate the expected distribution of the microlensed ... More
Using Kepler Candidates to Examine the Properties of Habitable Zone ExoplanetsMay 23 2016Jun 03 2016An analysis of the currently known exoplanets in the habitable zones (HZs) of their host stars is of interest in both the wake of the NASA Kepler mission and with prospects for expanding the known planet population through future ground- and space-based ... More
Discovery of a Compact Companion to a Nearby StarMar 11 2019Radial velocity (RV) searches for exoplanets have surveyed many of the nearest and brightest stars for long-term velocity variations indicative of a companion body. Such surveys often detect high-amplitude velocity signatures of objects that lie outside ... More
The Habitable Zone GalleryFeb 10 2012The Habitable Zone Gallery (www.hzgallery.org) is a new service to the exoplanet community which provides Habitable Zone (HZ) information for each of the exoplanetary systems with known planetary orbital parameters. The service includes a sortable table ... More
Radio Observations of the Supernova Remnant Candidate G312.5-3.0Nov 10 2000Jun 27 2003The radio images from the Parkes-MIT-NRAO (PMN) Southern Sky Survey at 4850 MHz have revealed a number of previously unknown radio sources. One such source, G312.5-3.0 (PMN J1421-6415), has been observed using the multi-frequency capabilities of the Australia ... More
Distinguishing Between Stellar and Planetary Companions With Phase MonitoringMay 25 2012Exoplanets which are detected using the radial velocity technique have a well-known ambiguity of their true mass, caused by the unknown inclination of the planetary orbit with respect to the plane of the sky. Constraints on the inclination are aided by ... More
Detectability of Exoplanet Periastron Passage in the Infra-RedAug 08 2011Aug 30 2011Characterization of exoplanets has matured in recent years, particularly through studies of exoplanetary atmospheres of transiting planets at infra-red wavelenegths. The primary source for such observations has been the Spitzer Space Telescope but these ... More
Exoplanetary Transit Constraints Based Upon Secondary Eclipse ObservationsAug 04 2009Transiting extrasolar planets provide an opportunity to study the mass-radius relation of planets as well as their internal structure. The existence of a secondary eclipse enables further study of the thermal properties of the the planet by observing ... More
Constraints on Secondary Eclipse Probabilities of Long-Period Exoplanets from Orbital ElementsNov 17 2009Long-period transiting exoplanets provide an opportunity to study the mass-radius relation and internal structure of extrasolar planets. Their studies grant insights into planetary evolution akin to the Solar System planets, which, in contrast to hot ... More
Decoupling Phase Variations in Multi-Planet SystemsNov 28 2012Due to the exquisite photometric precision, transiting exoplanet discoveries from the Kepler mission are enabling several new techniques of confirmation and characterization. One of these newly accessible techniques analyzes the phase variations of planets ... More
Constraining Orbital Parameters Through Planetary Transit MonitoringAug 13 2008The orbital parameters of extra-solar planets have a significant impact on the probability that the planet will transit the host star. This was recently demonstrated by the transit detection of HD 17156b whose favourable eccentricity and argument of periastron ... More
Habitability of Exomoons at the Hill or Tidal Locking RadiusJul 17 2013Moons orbiting extrasolar planets are the next class of object to be observed and characterized for possible habitability. Like the host-planets to their host-star, exomoons have a limiting radius at which they may be gravitationally bound, or the Hill ... More
Implications of the spectroscopic abundances in α Centauri A and BApr 01 2013Regardless of their close proximity, abundance measurements for both stars in {\alpha} Centauri by different groups have led to varying results. We have chosen to combine the abundance ratios from five similar data sets in order to reduce systematic effects ... More
On the Habitable Zones of Circumbinary Planetary SystemsNov 12 2012The effect of the stellar flux on exoplanetary systems is becoming an increasingly important property as more planets are discovered in the Habitable Zone (HZ). The Kepler mission has recently uncovered circumbinary planets with relatively complex HZs ... More
Canonical Projective Embeddings of the Deligne-Lusztig Curves Associated to $2A2$, $2B2$ and $2G2$Dec 30 2010The Deligne-Lusztig varieties associated to the Coxeter classes of the algebraic groups 2A2, 2B2 and 2G2 are affine algebraic curves. We produce explicit projective models of the closures of these curves. Furthermore for $d$ the Coxeter number of these ... More
Multiplicative $q$-hypergeometric series arising from real quadratic fieldsDec 23 2008Andrews, Dyson, and Hickerson showed that 2 $q$-hypergeometric series, going back to Ramanujan, are related to real quadratic fields, which explains interesting properties of their Fourier coefficients. There is also an interesting relation of such series ... More
A problem of Petersson about weight 0 meromorphic modular formsMay 02 2015Mar 23 2016In this paper, we provide an explicit construction of weight $0$ meromorphic modular forms. Following work of Petersson, we build these via Poincar\'e series. There are two main aspects of our investigation which differ from his approach. Firstly, the ... More
On the Frequency of Potential Venus Analogs from Kepler DataSep 09 2014The field of exoplanetary science has seen a dramatic improvement in sensitivity to terrestrial planets over recent years. Such discoveries have been a key feature of results from the {\it Kepler} mission which utilizes the transit method to determine ... More
Cyclic Transit Probabilities of Long-Period Eccentric Planets Due to Periastron PrecessionAug 20 2012Sep 07 2012The observed properties of transiting exoplanets are an exceptionally rich source of information that allows us to understand and characterize their physical properties. Unfortunately, only a relatively small fraction of the known exoplanets discovered ... More
Solar System Moons as Analogs for Compact Exoplanetary SystemsSep 05 2013The field of exoplanetary science has experienced a recent surge of new systems that is largely due to the precision photometry provided by the Kepler mission. The latest discoveries have included compact planetary systems in which the orbits of the planets ... More
A Potential Super-Venus in the Kepler-69 SystemMay 13 2013Transiting planets have greatly expanded and diversified the exoplanet field. These planets provide greater access to characterization of exoplanet atmospheres and structure. The Kepler mission has been particularly successful in expanding the exoplanet ... More
Observational Window Functions in Planet Transit SurveysJul 09 2009The probability that an existing planetary transit is detectable in one's data is sensitively dependent upon the window function of the observations. We quantitatively characterize and provide visualizations of the dependence of this probability as a ... More
Cadence Optimisation and Exoplanetary Parameter SensitivityDec 03 2007Jan 24 2008To achieve maximum planet yield for a given radial velocity survey, the observing strategy must be carefully considered. In particular, the adopted cadence can greatly affect the sensitivity to exoplanetary parameters such as period and eccentricity. ... More
Minerva-Australis I: Design, Commissioning, & First Photometric ResultsJan 31 2019Feb 07 2019The Minerva-Australis telescope array is a facility dedicated to the follow-up, confirmation, characterisation, and mass measurement of bright transiting planets discovered by the Transiting Exoplanet Survey Satellite (TESS) -- a category in which it ... More
The Catalog of Earth-Like Exoplanet Survey TArgets (CELESTA): A Database of Habitable Zones around Nearby StarsOct 19 2015Feb 24 2016Locating planets in circumstellar Habitable Zones is a priority for many exoplanet surveys. Space-based and ground-based surveys alike require robust toolsets to aid in target selection and mission planning. We present the Catalog of Earth-Like Exoplanet ... More
Microlensing limits on numbers and orbits of extra-solar planets from the 1998-2000 OGLE eventsApr 15 2003May 02 2003We analyze three years (1998-2000) of OGLE observations of microlensing events to place limits on the abundance of planets with a planet-to-star mass ratio $q=10^{-3}$ at distances $\sim 1-4$AU from their host stars, i.e. `cool Jupiters'. We fit a total ... More
Simulations for Multi-Object Spectrograph Planet SurveysMar 13 2007Radial velocity surveys for extra-solar planets generally require substantial amounts of large telescope time in order to monitor a sufficient number of stars. Two of the aspects which can limit such surveys are the single-object capabilities of the spectrograph, ... More
Super-Linear Gate and Super-Quadratic Wire Lower Bounds for Depth-Two and Depth-Three Threshold CircuitsNov 24 2015In order to formally understand the power of neural computing, we first need to crack the frontier of threshold circuits with two and three layers, a regime that has been surprisingly intractable to analyze. We prove the first super-linear gate lower ... More
55 Cancri: Stellar Astrophysical Parameters, a Planet in the Habitable Zone, and Implications for the Radius of a Transiting Super-EarthJun 06 2011Jul 22 2011The bright star 55 Cancri is known to host five planets, including a transiting super-Earth. The study presented here yields directly determined values for 55 Cnc's stellar astrophysical parameters based on improved interferometry: $R=0.943 \pm 0.010 ... More
Stellar Diameters and Temperatures II. Main Sequence K & M StarsAug 12 2012Aug 20 2012We present interferometric diameter measurements of 21 K- and M- dwarfs made with the CHARA Array. This sample is enhanced by literature radii measurements to form a data set of 33 K-M dwarfs with diameters measured to better than 5%. For all 33 stars, ... More
Planetary Phase Variations of the 55 Cancri SystemMay 09 2011Jul 22 2011Characterization of the composition, surface properties, and atmospheric conditions of exoplanets is a rapidly progressing field as the data to study such aspects become more accessible. Bright targets, such as the multi-planet 55 Cancri system, allow ... More
Radial Velocity Planet Detection Biases at the Stellar Rotational PeriodApr 11 2016Future generations of precise radial velocity (RV) surveys aim to achieve sensitivity sufficient to detect Earth mass planets orbiting in their stars' habitable zones. A major obstacle to this goal is astrophysical radial velocity noise caused by active ... More
KOI-1003: A new spotted, eclipsing RS CVn binary in the Kepler fieldOct 03 2016Using the high-precision photometry from the Kepler space telescope, thousands of stars with stellar and planetary companions have been observed. The characterization of stars with companions is not always straightforward and can be contaminated by systematic ... More
A Consistent Orbital Stability Analysis for the GJ 581 SystemApr 16 2014We apply a combination of N-body modeling techniques and automated data fitting with Monte Carlo Markov Chain uncertainty analysis of Keplerian orbital models to radial velocity data to determine long term stability of the planetary system GJ 581. We ... More
Predicting multiple planet stability and habitable zone companions in the TESS eraJan 31 2019We present an approach that is able to both rapidly assess the dynamical stability of multiple planet systems, and determine whether an exoplanet system would be capable of hosting a dynamically stable Earth-mass companion in its habitable zone. We conduct ... More
The First Extrasolar Planet Discovered with a New Generation High Throughput Doppler InstrumentMay 10 2006We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new generation Doppler instrument. The planet orbits HD 102195, a young star with solar metallicity that may be part of the local association. ... More
Low energy supersymmetry with a neutralino LSP and the CDF eeγγ+ missing E_T eventJul 24 1996Nov 22 1996We present a refined and expanded analysis of the CDF $ee\gamma\gamma + \Et$ event as superpartner production, assuming the lightest neutralino is the lightest supersymmetric particle. A general low-energy Lagrangian is constrained by a minimum cross ... More
Possible Signals of Constrained Minimal Supersymmetry at a High Luminosity Fermilab Tevatron ColliderMay 06 1995May 11 1995We study the most promising signals of Constrained Minimal Supersymmetry detectable at a luminosity upgraded 2 TeV Fermilab Tevatron collider. Using a full event-level Monte Carlo based on Pythia/Jetset, we simulate the trilepton signal examining in detail ... More
Two-photon decays of the lightest Higgs boson of supersymmetry at the LHCAug 08 1995We discuss the production and two-photon decay of the lightest Higgs boson (h) of the minimal supersymmetric standard model at the CERN Large Hadron Collider. Since the observability of the signal is quite model dependent, we conduct a thorough scan of ... More
First Results from the Transit Ephemeris Refinement and Monitoring Survey (TERMS)Dec 07 2009Transiting planet discoveries have yielded a plethora of information towards understanding the structure and atmospheres of extra-solar planets. These discoveries have been restricted to the short-period or low-periastron distance regimes due to the bias ... More
Refining Exoplanet Ephemerides and Transit Observing StrategiesSep 30 2009Transiting planet discoveries have yielded a plethora of information regarding the internal structure and atmospheres of extra-solar planets. These discoveries have been restricted to the low-periastron distance regime due to the bias inherent in the ... More
Search for supersymmetry with a light gravitino at the Fermilab Tevatron and CERN LEP collidersMay 26 1996Oct 02 1996We analyze the prospects for discovering supersymmetry at the Fermilab Tevatron and CERN LEP colliders in the scenario that the lightest supersymmetric particle is a gravitino of mass < 1 keV. We consider in particular the case that the lightest neutralino ... More
Supersymmetric analysis and predictions based on the CDF eeγγ + missing E_T eventFeb 07 1996Feb 16 1996We have analyzed the single $\eegg + \slashchar{E}_T$ event at CDF and found that the expected rate and kinematics are consistent with selectron pair production. We consider two classes of general low-energy supersymmetric theories, where either the lightest ... More
The Exoplanet Eccentricity Distribution from Kepler Planet CandidatesMar 07 2012Jul 02 2012The eccentricity distribution of exoplanets is known from radial velocity surveys to be divergent from circular orbits beyond 0.1 AU. This is particularly the case for large planets where the radial velocity technique is most sensitive. The eccentricity ... More
Theory-Motivated Benchmark Models and Superpartners at the TevatronSep 05 2002Mar 02 2003Recently published benchmark models have contained rather heavy superpartners. To test the robustness of this result, several benchmark models have been constructed based on theoretically well-motivated approaches, particularly string-based ones. These ... More
Validation of small Kepler transiting planet candidates in or near the habitable zoneNov 03 2017A main goal of NASA's Kepler Mission is to establish the frequency of potentially habitable Earth-size planets (eta Earth). Relatively few such candidates identified by the mission can be confirmed to be rocky via dynamical measurement of their mass. ... More
Precision near-infrared radial velocity instrumentation I: Absorption Gas CellsSep 11 2013We have built and commissioned gas absorption cells for precision spectroscopic radial velocity measurements in the near-infrared in the H and K bands. We describe the construction and installation of three such cells filled with 13CH4, 12CH3D, and 14NH3 ... More
Revisiting Gluinos at LHCMar 12 2018We examine the experimental signature of a UV complete Supersymmetry (SUSY) theory, the $G_2$-MSSM. This model predicts that only some superpartners will be produced in possibly detectable amounts at LHC: $p p \rightarrow \tilde{g}\tilde{g}$, $p p \rightarrow ... More
System Geometries and Transit / Eclipse ProbabilitiesNov 05 2010Transiting exoplanets provide access to data to study the mass-radius relation and internal structure of extrasolar planets. Long-period transiting planets allow insight into planetary environments similar to the Solar System where, in contrast to hot ... More
Application of the Trend Filtering Algorithm for Photometric Time Series DataMar 18 2016Detecting transient light curves (e.g., transiting planets) requires high precision data, and thus it is important to effectively filter systematic trends affecting ground based wide field surveys. We apply an implementation of the Trend Filtering Algorithm ... More
Characterizing the Parents: Exoplanets Around Cool StarsAug 01 2014The large majority of stars in the Milky Way are late-type dwarfs, and the frequency of low-mass exoplanets in orbits around these late-type dwarfs appears to be high. In order to characterize the radiation environments and habitable zones of the cool ... More
Truly eccentric. II. When can two circular planets mimic a single eccentric orbit?Jan 24 2019When, in the course of searching for exoplanets, sparse sampling and noisy data make it necessary to disentangle possible solutions to the observations, one must consider the possibility that what appears to be a single eccentric Keplerian signal may ... More
Precision near-infrared radial velocity instrumentation II: Non-Circular Core Fiber ScramblerSep 11 2013We have built and commissioned a prototype agitated non-circular core fiber scrambler for precision spectroscopic radial velocity measurements in the near-infrared H band. We have collected the first on-sky performance and modal noise tests of these novel ... More
Retrieval of Precise Radial Velocities from Near-Infrared High Resolution Spectra of Low Mass StarsMar 18 2016Given that low-mass stars have intrinsically low luminosities at optical wavelengths and a propensity for stellar activity, it is advantageous for radial velocity (RV) surveys of these objects to use near-infrared (NIR) wavelengths. In this work we describe ... More
Spin-Orbit Semimetals in the Layer GroupsApr 28 2016Aug 03 2016Recent interest in point and line node semimetals has lead to the proposal and discovery of these phenomena in numerous systems. Frequently, though, these nodal systems are described in terms of individual properties reliant on specific space group intricacies ... More
The independence number of the Birkhoff polytope graph, and applications to maximally recoverable codesFeb 19 2017Mar 31 2017Maximally recoverable codes are codes designed for distributed storage which combine quick recovery from single node failure and optimal recovery from catastrophic failure. Gopalan et al [SODA 2017] studied the alphabet size needed for such codes in grid ... More
LHC String PhenomenologyOct 03 2006Jun 05 2007We argue that it is possible to address the deeper LHC Inverse Problem, to gain insight into the underlying theory from LHC signatures of new physics. We propose a technique which may allow us to distinguish among, and favor or disfavor, various classes ... More
Recent Results from the Wide Angle Search for Planets (WASP) PrototypeSep 10 2002WASP0 is a prototype for what is intended to become a collection of WASPs whose primary aim is to detect transiting extra-solar planets across the face of their parent star. The WASP0 instrument is a wide-field (9-degree) 6.3cm aperture F/2.8 Apogee 10 ... More
A procedure for observing rocky exoplanets to maximize the likelihood that atmospheric oxygen will be a biosignatureJan 22 2018Here we advocate an observational strategy to help prioritize exoplanet observations. It starts with more easily obtained observational data, and ranks exoplanets for more difficult follow-up observations based on the likelihood of avoiding planets for ... More
Characterization of the Wolf 1061 Planetary SystemDec 29 2016Jan 13 2017A critical component of exoplanetary studies is an exhaustive characterization of the host star, from which the planetary properties are frequently derived. Of particular value are the radius, temperature, and luminosity, which are key stellar parameters ... More
Atmospheric Seasonality as an Exoplanet BiosignatureJun 12 2018Current investigations of exoplanet biosignatures have focused on static evidence of life, such as the presence of biogenic gases like O2 or CH4. However, the expected diversity of terrestrial planet atmospheres and the likelihood of both false positives ... More
Exploring Kepler Giant Planets in the Habitable ZoneMay 09 2018The Kepler mission found hundreds of planet candidates within the habitable zones (HZ) of their host star, including over 70 candidates with radii larger than 3 Earth radii ($R_\oplus$) within the optimistic habitable zone (OHZ) (Kane et al. 2016). These ... More
Laser remote magnetometry using mesospheric sodiumOct 18 2016We have demonstrated a remote magnetometer based on sodium atoms in the Earth's mesosphere, at a 106-kilometer distance from our instrument. A 1.33-watt laser illuminated the atoms, and the magnetic field was inferred from back-scattered light collected ... More
The Importance of 3D General Circulation Models for Characterizing the Climate and Habitability of Terrestrial Extrasolar PlanetsMar 12 2019While recently discovered exotic new planet-types have both challenged our imaginations and broadened our knowledge of planetary system workings, perhaps the most compelling objective of exoplanet science is to detect and characterize habitable and possibly ... More
Revised Orbit and Transit Exclusion for HD 114762bJun 07 2011Jun 10 2011Transiting planets around bright stars have allowed the detailed follow-up and characterization of exoplanets, such as the study of exoplanetary atmospheres. The Transit Ephemeris Refinement and Monitoring Survey (TERMS) is refining the orbits of the ... More
Laser remote magnetometry using mesospheric sodiumOct 18 2016Oct 21 2016We have demonstrated a remote magnetometer based on sodium atoms in the Earth's mesosphere, at a 106-kilometer distance from our instrument. A 1.33-watt laser illuminated the atoms, and the magnetic field was inferred from back-scattered light collected ... More
Discovery of a Low-Mass Companion to the Solar-Type Star TYC 2534-698-1Nov 06 2008Brown dwarfs and low-mass stellar companions are interesting objects to study since they occupy the mass region between deuterium and hydrogen burning. We report here the serendipitous discovery of a low-mass companion in an eccentric orbit around a solar-type ... More
Imaging Giant Protoplanets with the ELTsMar 13 2019We have now accumulated a wealth of observations of the planet-formation environment and of mature planetary systems. These data allow us to test and refine theories of gas-giant planet formation by placing constraints on the conditions and timescale ... More
Exclusion of Stellar Companions to Exoplanet Host StarsSep 15 2017Oct 02 2017Given the frequency of stellar multiplicity in the solar neighborhood, it is important to study the impacts this can have on exoplanet properties and orbital dynamics. There have been numerous imaging survey projects established to detect possible low-mass ... More
Precise Near-Infrared Radial VelocitiesMar 18 2016We present the results of two 2.3 micron near-infrared radial velocity surveys to detect exoplanets around 36 nearby and young M dwarfs. We use the CSHELL spectrograph (R ~46,000) at the NASA InfraRed Telescope Facility, combined with an isotopic methane ... More
On the Transit Potential of the Planet Orbiting iota DraconisJul 20 2010Aug 09 2010Most of the known transiting exoplanets are in short-period orbits, largely due to the bias inherent in detecting planets through the transit technique. However, the eccentricity distribution of the known radial velocity planets results in many of those ... More
Laser remote magnetometry using mesospheric sodiumOct 18 2016Feb 15 2017We have demonstrated a remote magnetometer based on sodium atoms in the Earth's mesosphere, at a 106-kilometer distance from our instrument. A 1.33-watt laser illuminated the atoms, and the magnetic field was inferred from back-scattered light collected ... More
Understanding Super-Earths with MINERVA-Australis at USQ's Mount Kent ObservatoryJun 25 2018Super Earths, planets between 5-10 Earth masses, are the most common type of exoplanet known, yet are completely absent from our Solar system. As a result, their detailed properties, compositions, and formation mechanisms are poorly understood. NASA's ... More
A High-Precision NIR Survey for RV Variable Low-Mass StarsMar 18 2016We present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2-M4 using CSHELL at the NASA IRTF in the $K$-band with an isotopologue methane gas cell to achieve wavelength calibration and ... More
Predicting hurricane numbers from Sea Surface Temperature: closed form expressions for the mean, variance and standard error of the number of hurricanesJan 15 2007One way to predict hurricane numbers would be to predict sea surface temperature, and then predict hurricane numbers as a function of the predicted sea surface temperature. For certain parametric models for sea surface temperature and the relationship ... More
Comparing the ensemble mean and the ensemble standard deviation as inputs for probabilistic medium-range temperature forecastsOct 13 2003We ask the following question: what are the relative contributions of the ensemble mean and the ensemble standard deviation to the skill of a site-specific probabilistic temperature forecast? Is it the case that most of the benefit of using an ensemble ... More
Probabilistic forecasts of temperature: measuring the utility of the ensemble spreadOct 06 2004The spread of ensemble weather forecasts contains information about the spread of possible future weather scenarios. But how much information does it contain, and how useful is that information in predicting the probabilities of future temperatures? One ... More
Elementary proofs of Kempe universalityNov 29 2015Elementary proofs are given that various connected algebraic curves and continuous curves in the plane may be traced out by pinned linkages.
Crystal frameworks, symmetry and affinely periodic flexesMar 09 2011Jul 11 2014Symmetry equations are obtained for the rigidity matrices associated with various forms of infinitesimal flexibility for an idealised bond-node crystal framework $\C$ in $\bR^d$. These equations are used to derive symmetry-adapted Maxwell-Calladine counting ... More
2-Primary Anick FibrationsApr 15 2008Cohen conjectured that for r>=2 there is a space T^2n+1(2^r) and a homotopy fibration sequence Loop^2 S^2n+1 --> S^2n-1 --> T^2n+1(2^r) --> Loop S^2n+1 with the property that the left map composed with the double suspension, Loop^2 S^2n+1 --> S^2n-1 --> ... More
Why e+ e- to T Tbar is DifferentJul 31 1998Unlike other examples of fermion pair production in e+ e- collisions, we show that top-quark pairs are produced in an essentially unique spin configuration in polarized e+ e- colliders at all energies. Since the directions of the electroweak decay products ... More
The Solar Neutrino Puzzle: UpdateNov 30 1995In this talk I will summarize the latest experimental results from the four solar neutrino experiments and discuss what this means for the flux of $^7Be$ and $^8B$ neutrinos. The implications for the solar models including the new versions with helium ... More