Search Publications
orvara: An Efficient Code to Fit Orbits Using Radial Velocity, Absolute, and/or Relative Astrometry
Dupuy, Trent J.; Bardalez Gagliuffi, Daniella C.; Brandt, Timothy D. +5 more
We present an open-source Python package, Orbits from Radial Velocity, Absolute, and/or Relative Astrometry (orvara), to fit Keplerian orbits to any combination of radial velocity, relative astrometry, and absolute astrometry data from the Hipparcos-Gaia Catalog of Accelerations. By combining these three data types, one can measure precise masses …
Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
Currie, Thayne; Dupuy, Trent J.; Bowler, Brendan P. +8 more
We present comprehensive orbital analyses and dynamical masses for the substellar companions Gl 229 B, Gl 758 B, HD 13724 B, HD 19467 B, HD 33632 Ab, and HD 72946 B. Our dynamical fits incorporate radial velocities, relative astrometry, and, most importantly, calibrated Hipparcos-Gaia EDR3 accelerations. For HD 33632 A and HD 72946 we perform thre…
Precise Dynamical Masses and Orbital Fits for β Pic b and β Pic c
Dupuy, Trent J.; Brandt, Timothy D.; Li, Yiting +2 more
We present a comprehensive orbital analysis to the exoplanets β Pictoris b and c that resolves previously reported tensions between the dynamical and evolutionary mass constraints on β Pic b. We use the Markov Chain Monte Carlo orbit code orvara to fit 15 years of radial velocities and relative astrometry (including recent GRAVITY measurements), a…
Characterizing Undetected Stellar Companions with Combined Data Sets
Kraus, Adam L.; Mann, Andrew W.; Wood, Mackenna L.
Binaries play a critical role in the formation, evolution, and fundamental properties of planets, stars, and stellar associations. Observational studies in these areas often include a mix of observations aimed at detecting or ruling out the presence of stellar companions. Rarely can nondetections rule out all possible binary configurations. Here w…
TIC 168789840: A Sextuply Eclipsing Sextuple Star System
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +48 more
We report the discovery of a sextuply eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during Cycle 1, with lightcurves extracted from TESS Full Frame Image data. It was also previously observ…
Precise Masses and Orbits for Nine Radial-velocity Exoplanets
Jensen-Clem, Rebecca; Dupuy, Trent J.; Brandt, Timothy D. +6 more
Radial-velocity (RV) surveys have discovered hundreds of exoplanetary systems but suffer from a fundamental degeneracy between planet mass M p and orbital inclination i. In this paper, we resolve this degeneracy by combining RVs with complementary absolute astrometry taken from the Gaia EDR3 version of the cross calibrated Hipparcos-G…
Constraining the Orbit and Mass of epsilon Eridani b with Radial Velocities, Hipparcos IAD-Gaia DR2 Astrometry, and Multiepoch Vortex Coronagraphy Upper Limits
Rice, Malena; Rosenthal, Lee J.; Hirsch, Lea A. +30 more
ϵ Eridani is a young planetary system hosting a complex multibelt debris disk and a confirmed Jupiter-like planet orbiting at 3.48 au from its host star. Its age and architecture are thus reminiscent of the early Solar System. The most recent study of Mawet et al., which combined radial-velocity data and Ms-band direct imaging upper limits, starte…
htof: A New Open-source Tool for Analyzing Hipparcos, Gaia, and Future Astrometric Missions
Dupuy, Trent J.; Brandt, Timothy D.; Li, Yiting +3 more
We present htof, an open-source tool for interpreting and fitting the intermediate astrometric data (IAD) from both the 1997 and 2007 reductions of Hipparcos, the scanning law of Gaia, and future missions such as the Nancy Grace Roman Space Telescope (NGRST). htof solves the astrometric parameters of any system for any arbitrary combination of abs…
True Masses of the Long-period Companions to HD 92987 and HD 221420 from Hipparcos-Gaia Astrometry
Vanderburg, Andrew; Pearce, Logan A.; Venner, Alexander
The extensive time span of modern radial velocity surveys has made the discovery of long-period substellar companions more common in recent years; however, measuring the true masses of these objects remains challenging. Astrometry from the Gaia mission is expected to provide mass measurements for many of these long-period companions, but these dat…
SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy
Currie, Thayne; Tamura, Motohide; Bailey, John I., III +29 more
We report the direct imaging discovery of a low-mass companion to the nearby accelerating A star, HIP 109427, with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument coupled with the Microwave Kinetic Inductance Detector Exoplanet Camera (MEC) and CHARIS integral field spectrograph. CHARIS data reduced with reference star point s…