The TOI-763 system: Sub-Neptunes orbiting a Sun-like star
Journal article, 2020

We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.

planets and satellites: individual: TIC 178819686

planets and satellites: detection

planets and satellites: individual: TOI-763

Author

Malcolm Fridlund

Leiden University

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

J.H. Livingston

University of Tokyo

D. Gandolfi

University of Turin

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

K. W.F. Lam

Technische Universität Berlin

Keivan G. Stassun

Vanderbilt University

Coel Hellier

Keele University

Judith Korth

University of Cologne

A. Hatzes

Thüringer Landessternwarte Tautenburg

L. Malavolta

University of Padua

R. Luque

University of La Laguna

Instituto de Astrofísica de Canarias

S. Redfield

Wesleyan University

E. W. Guenther

Thüringer Landessternwarte Tautenburg

Simon Albrecht

Aarhus University

O. Barragán

University of Oxford

Serena Benatti

Osservatorio Astronomico di Palermo Guiseppe S. Vaiana

L. Bouma

Princeton University

J. Cabrera

German Aerospace Center (DLR)

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

German Aerospace Center (DLR)

Fei Dai

Princeton University

Massachusetts Institute of Technology (MIT)

H. Deeg

University of La Laguna

Instituto de Astrofísica de Canarias

M. Esposito

Thüringer Landessternwarte Tautenburg

Iskra Georgieva

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

S. Grziwa

University of Cologne

Luciá González-Cuesta

University of La Laguna

Instituto de Astrofísica de Canarias

T. Hirano

Tokyo Institute of Technology

Jon M. Jenkins

NASA Ames Research Center

Petr Kabath

Czech Academy of Sciences

E. Knudstrup

Aarhus University

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

S. Mathur

University of La Laguna

Instituto de Astrofísica de Canarias

S. E. Mullally

Massachusetts Institute of Technology (MIT)

Norio Narita

Instituto de Astrofísica de Canarias

University of Tokyo

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Japan Science and Technology Agency

G. Nowak

Instituto de Astrofísica de Canarias

University of La Laguna

Henrik Olofsson

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Observation Support

E. Palle

Instituto de Astrofísica de Canarias

University of La Laguna

Martin Pätzold

University of Cologne

E. Pompei

European Southern Observatory Santiago

H. Rauer

Technische Universität Berlin

Freie Universität Berlin

German Aerospace Center (DLR)

George R. Ricker

Massachusetts Institute of Technology (MIT)

F. Rodler

European Southern Observatory Santiago

S. Seager

Massachusetts Institute of Technology (MIT)

L. M. Serrano

University of Turin

Alexis M. S. Smith

German Aerospace Center (DLR)

L. Spina

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

Monash University

J. Šubjak

Charles University

Czech Academy of Sciences

P. Tenenbaum

NASA Ames Research Center

Eric B. Ting

NASA Ames Research Center

A. Vanderburg

University of Wisconsin Madison

Roland K. Vanderspek

Massachusetts Institute of Technology (MIT)

Vincent Van Eylen

University College London (UCL)

S. Villanueva

Massachusetts Institute of Technology (MIT)

J. N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 498 3 4503-4517

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology

Other Physics Topics

DOI

10.1093/mnras/staa2502

More information

Latest update

11/12/2021