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Retired A Stars and Their Companions VIII: 15 New Planetary Signals Around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts
Jacob K. Luhn, Fabienne A. Bastien, Jason T. Wright +3
We present the discovery of 7 new planets and 8 planet candidates around subgiant stars, as additions to the known sample of planets around "retired A stars" (Johnson et al. 2006).…
Techniques for Finding Close-in, Low-mass Planets around Subgiants
Amber A. Medina, John A. Johnson, Jason D. Eastman +1
Jupiter-mass planets with large semi-major axes ( AU) occur at a higher rate around evolved intermediate mass stars. There is a pronounced paucity of close-in ( A…
Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab
Danielle Piskorz, Cam Buzard, Michael R. Line +9
We describe the detection of water vapor in the atmosphere of the transiting hot Jupiter KELT-2Ab by treating the star-planet system as a spectroscopic binary with high-resolution,…
Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass
Luan Ghezzi, Benjamin T. Montet, John Asher Johnson
Exoplanet surveys of evolved stars have provided increasing evidence that the formation of giant planets depends not only on stellar metallicity ([Fe/H]), but also the mass ($M_\st…
An accurate mass determination for Kepler-1655b, a moderately-irradiated world with a significant volatile envelope
R. D. Haywood, A. Vanderburg, A. Mortier +32
We present the confirmation of a small, moderately-irradiated (F = 155 +/- 7 Fearth) Neptune with a substantial gas envelope in a P=11.8728787+/-0.0000085-day orbit about a quiet,…
KELT-22Ab: A Massive Hot Jupiter Transiting a Near Solar Twin
Jonathan Labadie-Bartz, Joseph E. Rodriguez, Keivan G. Stassun +58
We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright () Sun-like G2V star TYC 7518-468-1. The plane…
The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets
Erik A. Petigura, Geoffrey W. Marcy, Joshua N. Winn +7
Probing the connection between a star's metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of pl…
Origins of Hot Jupiters
Rebekah I. Dawson, John Asher Johnson
Hot Jupiters were the first exoplanets to be discovered around main sequence stars and astonished us with their close-in orbits. They are a prime example of how exoplanets have cha…
An ultra-short period rocky super-Earth with a secondary eclipse and a Neptune-like companion around K2-141
Luca Malavolta, Andrew W. Mayo, Tom Louden +44
Ultra-short period (USP) planets are a class of low mass planets with periods shorter than one day. Their origin is still unknown, with photo-evaporation of mini-Neptunes and in-si…