TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star
Artikel i vetenskaplig tidskrift, 2023

We report the discovery of a hot (Teq ≈ 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 {equation presented} days and a radius of {equation presented}. 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 {equation presented}. These parameters imply that the planet is of moderate density ({equation presented}) 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.

Techniques: radial velocities

Techniques: photometric

Planets and satellites: detection

Planets and satellites: composition

Planets and satellites: individual: TOI-733

Författare

Iskra Georgieva

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

E. Goffo

Thüringer Landessternwarte Tautenburg

Universita degli Studi di Torino

L. Acuña

Laboratoire d'Astrophysique de Marseille

Max-Planck-Gesellschaft

A. Aguichine

Laboratoire d'Astrophysique de Marseille

University of California

L. M. Serrano

Universita degli Studi di Torino

K. W.F. Lam

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. Gandolfi

Universita degli Studi di Torino

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

S. B. Howell

NASA Ames Research Center

Fei Dai

California Institute of Technology (Caltech)

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Judith Korth

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Lunds universitet

M. Deleuil

Laboratoire d'Astrophysique de Marseille

O. Barragán

University of Oxford

William D. Cochran

The University of Texas at Austin

Szilárd Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. Deeg

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Eike W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

Jon M. Jenkins

NASA Ames Research Center

J. Livingston

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

R. Luque

University of Chicago

O. Mousis

Laboratoire d'Astrophysique de Marseille

H. L.M. Osborne

University College London (UCL)

E. Palle

Instituto de Astrofísica de Canarias

S. Redfield

Wesleyan University

Vincent Van Eylen

University College London (UCL)

J. D. Twicken

NASA Ames Research Center

SETI Institute

J. N. Winn

Princeton University

A. Alqasim

University College London (UCL)

K. I. Collins

George Mason University

Crystal Gnilka

National Aeronautics and Space Administration (NASA)

NASA Ames Research Center

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

Hannah M. Lewis

Space Telescope Science Institute (STScI)

Howard M. Relles

Harvard-Smithsonian Center for Astrophysics

George R. Ricker

Massachusetts Institute of Technology (MIT)

Pamela Rowden

Piccadilly

S. Seager

Massachusetts Institute of Technology (MIT)

Avi Shporer

Massachusetts Institute of Technology (MIT)

Thiam Guan Tan

Perth Exoplanet Survey Telescope

A. Vanderburg

University of Wisconsin Madison

The University of Texas at Austin

Roland K. Vanderspek

Massachusetts Institute of Technology (MIT)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 674 A117

Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2)

Rymdstyrelsen (177/19), 2020-01-01 -- 2022-12-31.

Rymdstyrelsen (65/19), 2020-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/202345961

Mer information

Senast uppdaterat

2023-07-07