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A Massive Hot Jupiter Orbiting a Metal-rich Early M Star Discovered in the TESS Full-frame Images
Latham, David W.; Quinn, Samuel N.; Littlefield, Colin +41 more
Observations and statistical studies have shown that giant planets are rare around M dwarfs compared with Sun-like stars. The formation mechanism of these extreme systems has remained under debate for decades. With the help of the TESS mission and ground-based follow-up observations, we report the discovery of TOI-4201b, the most massive and dense…
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star
Hellier, Coel; Rampalli, Rayna; Latham, David W. +47 more
We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (<700 Myr). This planet stands out because of its unusually long orbital period for transiting planets with known masses (P orb = 225.11781 ${}_{-0.00022}^{+0.00025}$ days) and because it has…
Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST
Lin, Chia-Lung; Ip, Wing-Huen; Luo, A. -Li +3 more
We present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in Hα lines, from which the average mass accretion rate of 1.76 × 10‑9 M ⊙ yr‑1 is derived. Two of the stars, …
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…