Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
Jerome P. de Leon
John H. Livingston
James S. Jenkins
Jose I. Vines
Robert A. Wittenmyer
Jake T. Clark
Joshua I. M. Winn
Brett Addison
Sarah Ballard
Daniel Bayliss
Charles Beichman
Björn Benneke
David Anthony Berardo
Brendan P. Bowler
Tim Brown
Edward M. Bryant
Jessie Christiansen
David Ciardi
Karen A. Collins
Kevin I. Collins
Abstract： Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599, a young (300 Myr), nearby (d=40 pc) K star. We validate the transiting planet candidate as a bona fide planet using data from the TESS, Spitzer, and Gaia missions, ground-based photometry from IRSF, LCO, PEST, and NGTS, speckle imaging from Gemini, and spectroscopy from CHIRON, NRES, FEROS, and Minerva-Australis. The planet has an orbital period of 4.13 d, and a radius of 2.7Rearth. The RV data yields a 3-sigma mass upper limit of 30.5Mearth which is explained by either a massive companion or the large observed jitter typical for a young star. The brightness of the host star (V~9 mag) makes it conducive to detailed characterization via Doppler mass measurement which will provide a rare view into the interior structure of young planets.
Peer Review Status:
Awaiting Review
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