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TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star

Hobson, MJ; Jordán, A; Bryant, EM; Brahm, R; Bayliss, D; Hartman, JD; Bakos, GI; ... Winn, JN; + view all (2023) TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star. The Astrophysical Journal Letters , 946 (1) , Article L4. 10.3847/2041-8213/acbd9a. Green open access

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Abstract

We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate from TESS photometry and confirmed with radial velocities from ESPRESSO and ground-based photometry from HATSouth, MEarth-South, TRAPPIST-South, LCOGT, and ExTrA. We find that the planet has a mass of 0.665 ± 0.025 M J and a radius of 1.017 ± 0.044 R J. It orbits close to its host star, with an orbital period of 2.5926 days but has an equilibrium temperature of ≈ 604 K, well below the expected threshold for radius inflation of hot Jupiters. The host star has a mass of 0.3939 ± 0.0030 M ☉, a radius of 0.3697 ± 0.0018 R ☉, an effective temperature of 3389 K, and a J-band magnitude of 11.706 ± 0.025. Current planet formation models do not predict the existence of gas giants such as TOI-3235 b around such low-mass stars. With a high transmission spectroscopy metric, TOI-3235 b is one of the best-suited giants orbiting M dwarfs for atmospheric characterization.

Type: Article
Title: TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/2041-8213/acbd9a
Publisher version: https://doi.org/10.3847/2041-8213%2Facbd9a
Language: English
Additional information: © 2023 IOP Publishing. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0/).
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/10169649
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