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TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star

Georgieva, IY; Persson, CM; Goffo, E; Acuña, L; Aguichine, A; Serrano, LM; Lam, KWF; ... Vanderspek, R; + view all (2023) TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star. Astronomy and Astrophysics , 674 , Article A117. 10.1051/0004-6361/202345961. Green open access

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Abstract

We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of {equation presented} days and a radius of {equation presented}. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s-1, translating into a planet mass of {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) and place it in the transition region between rocky and volatile-rich planets with H/He-dominated envelopes on the mass-radius diagram. Combining these with stellar parameters and abundances, we calculated planet interior and atmosphere models, which in turn suggest that TOI-733 b has a volatile-enriched, most likely secondary outer envelope, and may represent a highly irradiated ocean world. This is one of only a few such planets around G-type stars that are well characterised.

Type: Article
Title: TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202345961
Publisher version: https://doi.org/10.1051/0004-6361/202345961
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Planets and satellites: detection – planets and satellites: composition – planets and satellites: individual: TOI-733 – techniques: photometric – techniques: radial velocities
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/10174154
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