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

Georgieva, Iskra Y. and Persson, Carina M. and Goffo, Elisa and Acuna, Lorena and Aguichine, Artyom and Serrano, Luisa M. and Lam, Kristine W. F. and Gandolfi, Davide and Collins, Karen A. and Howell, Steven B. and Dai, Fei and Fridlund, Malcolm and Korth, Judith and Deleuil, Magali and Barragan, Oscar and Cochran, William D. and Csizmadia, Szilard and Deeg, Hans J. and Guenther, Eike W and Hatzes, Artie P. and Jenkins, Jon M. and Livingston, John H. and Luque, Rafael and Mousis, Olivier and Osborne, Hannah L. M. and Palle, Enric and Redfield, Seth and Van Eylen, Vincent and Twicken, Joseph D. and Winn, Joshua N. and Alqasim, Ahlam and Collins, Kevin I. and Gnilka, Crystal L. and Latham, David W. and Lewis, Hannah M. and Relles, Howard M. and Ricker, George R. and Rowden, Pamela and Seager, Sara and Shporer, Avi and Tan, Thiam-Guan and Vanderburg, Andrew and Vanderspek, Roland (2023) TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star. Astronomy & Astrophysics, 674, A117. EDP Sciences. doi: 10.1051/0004-6361/202345961. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2023/06/aa45961-23/aa45961-23.html

Abstract

We report the discovery of a hot (T_eq ~ 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 P_orb = 4.884765 - 2.4e^5 + 1.9e^5 days and a radius of R_p = 1.992 - 0.090 + 0.085 R_earth. 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 M_p = 5.72 - 0.68 + 0.70 M_earth. These parameters imply that the planet is of moderate density rho_p = 3.98 - 0.66 + 0.77 g cm^-3 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.

Item URL in elib:https://elib.dlr.de/195655/
Document Type:Article
Title:TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Georgieva, Iskra Y.Department of Space, Earth and Environmanet, Chalmers University of Technology, Onsala space Observatory, SE-439 92 Onsala SwedenUNSPECIFIEDUNSPECIFIED
Persson, Carina M.Department of Space, Earth and Environmanet, Chalmers University of Technology, Onsala space Observatory, SE-439 92 Onsala SwedenUNSPECIFIEDUNSPECIFIED
Goffo, ElisaDipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy ; Thüringer Landessternwarte Tautenburg, GermanyUNSPECIFIEDUNSPECIFIED
Acuna, LorenaAix Marseille Université, Institut Origines, CNRS, CNES, LAM, Marseille, FranceUNSPECIFIEDUNSPECIFIED
Aguichine, ArtyomAix-Marseille Université, Institut Origines, CNRS, CNES, LAM, Marseille, FranceUNSPECIFIEDUNSPECIFIED
Serrano, Luisa M.Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, 10125 Torino, ItalyUNSPECIFIEDUNSPECIFIED
Lam, Kristine W. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideDipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, Italyhttps://orcid.org/0000-0001-8627-9628UNSPECIFIED
Collins, Karen A.Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAhttps://orcid.org/0000-0001-6588-9574UNSPECIFIED
Howell, Steven B.NASA Ames Research Center, Moffett Field, CA 94035, USAUNSPECIFIEDUNSPECIFIED
Dai, FeiDivision of Geological and Planetary Sciences, 1200 E California Boulevard, Pasadena, CA, 91125, USAUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmDepartment of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden ; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands 0000-0003-2180-9936UNSPECIFIEDUNSPECIFIED
Korth, JudithDepartment of Space, Earth and Environment, Astronomy and Plasma Physics, Chalmers University of Technology, SE-41296 Gothenburg, SwedenUNSPECIFIEDUNSPECIFIED
Deleuil, MagaliAix-Marseille Université, CNRS, CNES, LAM, Marseilles, FranceUNSPECIFIEDUNSPECIFIED
Barragan, OscarOxford Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKUNSPECIFIEDUNSPECIFIED
Cochran, William D.Center for Planetary Systems Habitability and McDonald Observa- tory, The University of Texas at Austin, Austin Texas USA 78712, USAUNSPECIFIEDUNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, Hans J.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0003-0047-4241UNSPECIFIEDUNSPECIFIED
Guenther, Eike WThüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIEDUNSPECIFIED
Hatzes, Artie P.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIEDUNSPECIFIED
Jenkins, Jon M.NASA Ames Research Center, Moffett Field, CA 94035, USAhttps://orcid.org/0000-0002-4715-9460UNSPECIFIED
Livingston, John H.Astrobiology Center, 2-21-1 Osawa, Mitaka, TokyoUNSPECIFIEDUNSPECIFIED
Luque, RafaelDepartment of Astronomy & Astrophysics, University of Chicago, Chicago, IL 60637, USAUNSPECIFIEDUNSPECIFIED
Mousis, OlivierAix-Marseille Université, CNRS, CNES, LAM, Marseilles, FranceUNSPECIFIEDUNSPECIFIED
Osborne, Hannah L. M.Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIEDUNSPECIFIED
Palle, EnricInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIEDUNSPECIFIED
Redfield, SethAstronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USA 0000-0003-3786-3486UNSPECIFIEDUNSPECIFIED
Van Eylen, VincentMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIEDUNSPECIFIED
Twicken, Joseph D.NASA Ames Research Center, Moffett Field, CA 94035, USA; SETI Institute, 189 Bernardo Ave., Suite 200, Mountain View, CA 94043, USAUNSPECIFIEDUNSPECIFIED
Winn, Joshua N.Department of Astrophysics Sciences, Princeton University, 4 Ivy Lane, Priceton, NJ 08544, USAUNSPECIFIEDUNSPECIFIED
Alqasim, AhlamMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIEDUNSPECIFIED
Collins, Kevin I.George Mason University, 4400 University Drive, Fairfax, VA 22030, USAUNSPECIFIEDUNSPECIFIED
Gnilka, Crystal L.NASA Ames Research Center, Moffett Field, CA 94035, USAUNSPECIFIEDUNSPECIFIED
Latham, David W.Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAhttps://orcid.org/0000-0001-9911-7388UNSPECIFIED
Lewis, Hannah M.Space Telescope Science Institute, 3700 San Martin Drive, Balti- more, MD 21218, USAUNSPECIFIEDUNSPECIFIED
Relles, Howard M.Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAUNSPECIFIEDUNSPECIFIED
Ricker, George R.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Rowden, PamelaSchool of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UKUNSPECIFIEDUNSPECIFIED
Seager, SaraDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA; DUNSPECIFIEDUNSPECIFIED
Shporer, AviDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIEDUNSPECIFIED
Tan, Thiam-GuanPerth Exoplanet Survey Telescope, Perth, Western, WA 6076, AustraliaUNSPECIFIEDUNSPECIFIED
Vanderburg, AndrewDepartment of Astronomy, The University of Texas at Austin, 2515Speedway, Stop C1400 Austin, TX 78712-1205, USAUNSPECIFIEDUNSPECIFIED
Vanderspek, RolandDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIEDUNSPECIFIED
Date:June 2023
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:674
DOI:10.1051/0004-6361/202345961
Page Range:A117
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:planets and satellites: detection, planets and satellites: composition, planets and satellites: individual: TOI-733, techniques: photometric, techniques: radial velocities, Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Lam, Wai Fun
Deposited On:29 Jun 2023 09:24
Last Modified:29 Jun 2023 09:24

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