Search Publications
A Reanalysis of the Composition of K2-106b: An Ultra-short-period Super-Mercury Candidate
Mousis, Olivier; Gaudi, B. Scott; Johnson, Jennifer A. +9 more
We present a reanalysis of the K2-106 transiting planetary system, with a focus on the composition of K2-106b, an ultra-short-period, super-Mercury candidate. We globally model existing photometric and radial velocity data and derive a planetary mass and radius for K2-106b of M p = 8.53 ± 1.02 M ⊕ and ${R}_{p}={1.71}_{-0.05…
The Comprehensive Archive of Substellar and Planetary Accretion Rates
Wang, H.; Marleau, G. -D.; Edwards, S. +11 more
Accretion rates ( ) of young stars show a strong correlation with object mass (M); however, extension of the relation into the substellar regime is less certain. Here, we present the Comprehensive Archive of Substellar and Planetary Accretion Rates (CASPAR), the largest compilation to date of substellar accretion diagnostics. CASPAR includes: 658 …
Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars
Haardt, Francesco; Rauscher, Emily; Gallo, Elena +4 more
We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets w…
Identifying Exoplanets with Deep Learning. V. Improved Light-curve Classification for TESS Full-frame Image Observations
Vanderburg, Andrew; Dattilo, Anne; Ricker, George R. +8 more
The TESS mission produces a large amount of time series data, only a small fraction of which contain detectable exoplanetary transit signals. Deep-learning techniques such as neural networks have proved effective at differentiating promising astrophysical eclipsing candidates from other phenomena such as stellar variability and systematic instrume…
The Radial Distribution and Excitation of H2 around Young Stars in the HST-ULLYSES Survey
Herczeg, Gregory J.; France, Kevin; Ábrahám, P. +8 more
The spatial distribution and evolution of gas in the inner 10 au of protoplanetary disks form the basis for estimating the initial conditions of planet formation. Among the most important constraints derived from spectroscopic observations of the inner disk are the radial distributions of the major gas phase constituents, how the properties of the…
The Colorado Ultraviolet Transit Experiment Mission Overview
France, Kevin; Fleming, Brian; Hoadley, Keri +18 more
Atmospheric escape is a fundamental process that affects the structure, composition, and evolution of many planets. The signatures of escape are detectable on close-in, gaseous exoplanets orbiting bright stars, owing to the high levels of extreme-ultraviolet irradiation from their parent stars. The Colorado Ultraviolet Transit Experiment (CUTE) is…
The McDonald Accelerating Stars Survey: Architecture of the Ancient Five-planet Host System Kepler-444
Cochran, William D.; Endl, Michael; Isaacson, Howard T. +11 more
We present the latest and most precise characterization of the architecture for the ancient (≈11 Gyr) Kepler-444 system, which is composed of a K0 primary star (Kepler-444 A) hosting five transiting planets and a tight M-type spectroscopic binary (Kepler-444 BC) with an A-BC projected separation of 66 au. We have measured the system's relative ast…
Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma
Rappaport, Saul A.; Jayaraman, Rahul; Garnavich, Peter +7 more
There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf's rotational frequency is slightly desynchronized from the binary orbital frequency. We report Kepler K2 and TESS observations of two such systems. The first, SDSS J084617.11+245344.1, was obs…
Interstellar Polarization Survey. II. General Interstellar Medium
Magalhães, A. M.; Kawabata, Koji S.; Rodrigues, C. V. +4 more
Magnetic fields permeate the entire Galaxy and are essential to, for example, the regulation of several stages of the star formation process and cosmic-ray transportation. Unraveling their properties, such as intensity and topology, is an observational challenge that requires combining different and complementary techniques. The polarization of st…
Observing Atmospheric Escape in Sub-Jovian Worlds with JWST
Alam, Munazza K.; Espinoza, Néstor; Dos Santos, Leonardo A. +1 more
Hydrodynamic atmospheric escape is considered an important process that shapes the evolution of sub-Jovian exoplanets, particularly those with short orbital periods. The metastable He line in the near-infrared at 1.083 µm is a reliable tracer of atmospheric escape in hot exoplanets, with the advantage of being observable from the ground. How…