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

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https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202346406

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https://doi.org/10.1051/0004-6361/202346406
 http://hdl.handle.net/11603/28131

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection

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https://orcid.org/0000-0002-0476-4206

Date

2023-05-11

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journal articles
preprints
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Citation of Original Publication

Psaridi , Angelica, et al. "Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS. TOI-615b, TOI-622b, and TOI-2641b" Planets and planetary systems (05 May, 2023). https://doi.org/10.1051/0004-6361/202346406.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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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⁺⁰.⁰⁵−₀.₀₆ Rⱼᵤₚ and 0.43⁺⁰.⁰⁹−₀.₀₈ 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⁺⁰.⁰⁷−₀.₀₈ 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⁺⁰.⁰²−₀.₀₄ Mⱼᵤₚ planet in a 4.88 day orbit with a grazing transit (b = 1.04⁺⁰.⁰⁵−₀.₀₆) that results in a poorly constrained radius of 1.61⁺⁰.⁴⁶−₀.₆₄ 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.