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A sub-Neptune transiting the young field star HD 18599  at 40 pc

de Leon, JP; Livingston, JH; Jenkins, JS; Vines, JI; Wittenmyer, RA; Clark, JT; Winn, JIM; ... Zhou, G; + view all (2023) A sub-Neptune transiting the young field star HD 18599  at 40 pc. Monthly Notices of the Royal Astronomical Society , 522 (1) pp. 750-766. 10.1093/mnras/stad894. Green open access

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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 2.7 R⊕ . The RV data yields a 3-σ mass upper limit of 30.5 M⊕  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.

Type: Article
Title: A sub-Neptune transiting the young field star HD 18599  at 40 pc
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stad894
Publisher version: https://doi.org/10.1093/mnras/stad894
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: techniques: radial velocities, techniques: spectroscopic, planets and satellites: detection, stars: individual: TOI-179
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10169645
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