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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, Angelica; Bouchy, François; Lendl, Monika; Akinsanmi, Babatunde; Stassun, Keivan G.; Smalley, Barry; Armstrong, David J.; Howard, Saburo; Ulmer-Moll, Solène; Grieves, Nolan; Barkaoui, Khalid; Rodriguez, Joseph E.; Bryant, Edward M.; Suárez, Olga; Guillot, Tristan; Evans, Phil; Attia, Omar; Wittenmyer, Robert A.; Yee, Samuel W.; Collins, Karen A.; Zhou, George; Galland, Franck; Parc, Léna; Udry, Stéphane; Figueira, Pedro; Ziegler, Carl; Mordasini, Christoph; Winn, Joshua N.; Seager, Sara; Jenkins, Jon M.; Twicken, Joseph D.; Brahm, Rafael; Jones, Matías I.; Abe, Lyu; Addison, Brett; Briceño, César; Briegal, Joshua T.; Collins, Kevin I.; Daylan, Tansu; Eigmüller, Phillip; Furesz, Gabor; Guerrero, Natalia M.; Hagelberg, Janis; Heitzmann, Alexis; Hounsell, Rebekah; Huang, Chelsea X.; Krenn, Andreas; Law, Nicholas M.; Mann, Andrew W.; McCormac, James; Mékarnia, Djamel; Mounzer, Dany; Nielsen, Louise D.; Osborn, Ares; Reinarz, Yared; Sefako, Ramotholo R.; Steiner, Michal; Strøm, Pau...

Authors

Angelica Psaridi

François Bouchy

Monika Lendl

Babatunde Akinsanmi

Keivan G. Stassun

David J. Armstrong

Saburo Howard

Solène Ulmer-Moll

Nolan Grieves

Khalid Barkaoui

Joseph E. Rodriguez

Edward M. Bryant

Olga Suárez

Tristan Guillot

Phil Evans

Omar Attia

Robert A. Wittenmyer

Samuel W. Yee

Karen A. Collins

George Zhou

Franck Galland

Léna Parc

Stéphane Udry

Pedro Figueira

Carl Ziegler

Christoph Mordasini

Joshua N. Winn

Sara Seager

Jon M. Jenkins

Joseph D. Twicken

Rafael Brahm

Matías I. Jones

Lyu Abe

Brett Addison

César Briceño

Joshua T. Briegal

Kevin I. Collins

Tansu Daylan

Phillip Eigmüller

Gabor Furesz

Natalia M. Guerrero

Janis Hagelberg

Alexis Heitzmann

Rebekah Hounsell

Chelsea X. Huang

Andreas Krenn

Nicholas M. Law

Andrew W. Mann

James McCormac

Djamel Mékarnia

Dany Mounzer

Louise D. Nielsen

Ares Osborn

Yared Reinarz

Ramotholo R. Sefako

Michal Steiner

Paul A. Strøm

Amaury H. M. J. Triaud

Roland Vanderspek

Leonardo Vanzi

Jose I. Vines

Christopher A. Watson

Duncan J. Wright

Abner Zapata



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 (similar to 1277 F-circle dot) and bloated Saturn-mass planet (1.69(-0.06)(+0.05) R-Jup and 0.43(-0.08)(+0.09) M-Jup) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82(-0.03)(+0.03) R-Jup and a mass of 0.30(-0.08)(+0.07) M-Jup in a 6.40 day orbit. Despite its high insolation flux (similar to 600 F-circle dot), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39(-0.04)(+0.02) M-Jup 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) R-Jup. 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.

Journal Article Type Article
Acceptance Date May 2, 2023
Online Publication Date Jun 30, 2023
Publication Date 2023-07
Deposit Date Nov 1, 2023
Publicly Available Date Nov 2, 2023
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 675
Pages A39
DOI https://doi.org/10.1051/0004-6361/202346406
Keywords Space and Planetary Science; Astronomy and Astrophysics; planets and satellites: individual: TOI-615b / planets and satellites: individual: TOI-622b / stars: early-type / techniques: photometric / techniques: radial velocities / planets and satellites: in

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Copyright Statement
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.

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