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Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b

Psaridi, A; Bouchy, F; Lendl, M; Akinsanmi, B; Stassun, KG; Smalley, B; Armstrong, DJ; ... Zapata, A; + view all (2023) Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b. Astronomy and Astrophysics , 675 , Article A39. 10.1051/0004-6361/202346406. Green open access

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Abstract

While the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report the discovery of TOI-615b, TOI-622b, and TOI-2641b, three Saturn-mass planets transiting main sequence, F-type stars. The planets were identified by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with complementary ground-based and radial velocity observations. TOI-615b is a highly irradiated (∼1277 F) and bloated Saturn-mass planet (1.69-0.06+0.05 RJup and 0.43-0.08+0.09 MJup) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82-0.03+0.03 RJup and a mass of 0.30-0.08+0.07 MJup in a 6.40 day orbit. Despite its high insolation flux (∼600 F), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39-0.04+0.02 MJup planet in a 4.88 day orbit with a grazing transit (b = 1.04-0.06+0.05) that results in a poorly constrained radius of 1.61-0.64+0.46 RJup. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and JWST. Future atmospheric and spin-orbit alignment observations are essential since they can provide information on the atmospheric composition, formation, and migration of exoplanets across various stellar types.

Type: Article
Title: Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202346406
Publisher version: http://dx.doi.org/10.1051/0004-6361/202346406
Language: English
Additional information: Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Keywords: Planets and satellites: individual: TOI-615b – planets and satellites: individual: TOI-622b – stars: early-type – techniques: photometric – techniques: radial velocities – planets and satellites: individual: TOI-2641b
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/10191915
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