A sub-Neptune transiting the young field star HD 18599 at 40 pc
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.
Keywords
Cite
@article{arxiv.2210.08179,
title = {A sub-Neptune transiting the young field star HD 18599 at 40 pc},
author = {Jerome P. de Leon and John H. Livingston and James S. Jenkins and Jose I. Vines and Robert A. Wittenmyer and Jake T. Clark and Joshua I. M. Winn and Brett Addison and Sarah Ballard and Daniel Bayliss and Charles Beichman and Björn Benneke and David Anthony Berardo and Brendan P. Bowler and Tim Brown and Edward M. Bryant and Jessie Christiansen and David Ciardi and Karen A. Collins and Kevin I. Collins and Ian Crossfield and Drake Deming and Diana Dragomir and Courtney D. Dressing and Akihiko Fukui and Tianjun Gan and Steven Giacalone and Samuel Gill and Erica Gonz\' alez Alvarez and Katharine Hesse and Jonathan Horner and Steve B. Howell and Jon M. Jenkins and Stephen R. Kane and Alicia Kendall and John F. Kielkopf and Laura Kreidberg and David W. Latham and Huigen Liu and Michael B. Lund and Rachel Matson and Elisabeth Matthews and Matthew W. Mengel and Farisa Morales and Mayuko Mori and Norio Narita and Taku Nishiumi and Jack Okumura and Peter Plavchan and Sam Quinn and Markus Rabus and George Ricker and Alexander Rudat and Joshua Schlieder and Richard P. Schwarz and Sara Seager and Avi Shporer and Alexis M. S. Smith and Avi Sphorer and Keivan Stassun and Motohide Tamura and Thiam Guan Tan and C. G. Tinney and Roland Vanderspek and Varoujan Gorjian and Michael W. Werner and Richard G. West and Duncan Wright and Hui Zhang and George Zhou},
journal= {arXiv preprint arXiv:2210.08179},
year = {2023}
}
Comments
submitted to MNRAS