The TOI-763 system: Sub-Neptunes orbiting a Sun-like star
Artikel i vetenskaplig tidskrift, 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: detection

planets and satellites: individual: TOI-763

planets and satellites: individual: TIC 178819686

Författare

Malcolm Fridlund

Universiteit Leiden

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

J.H. Livingston

University of Tokyo

D. Gandolfi

Universita degli Studi di Torino

Carina Persson

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

K. W.F. Lam

Technische Universität Berlin

Keivan G. Stassun

Vanderbilt University

Coel Hellier

Keele University

Judith Korth

Universität zu Köln

A. Hatzes

Thüringer Landessternwarte Tautenburg

L. Malavolta

Università di Padova

R. Luque

Instituto Astrofisico de Canarias

Universidad de la Laguna

S. Redfield

Wesleyan University

E. W. Guenther

Thüringer Landessternwarte Tautenburg

Simon Albrecht

Aarhus Universitet

O. Barragán

University of Oxford

Serena Benatti

Osservatorio Astronomico di Palermo Guiseppe S. Vaiana

L. Bouma

Princeton University

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

William D. Cochran

The University of Texas at Austin

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

H. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

M. Esposito

Thüringer Landessternwarte Tautenburg

Iskra Georgieva

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

S. Grziwa

Universität zu Köln

Luciá González-Cuesta

Instituto Astrofisico de Canarias

Universidad de la Laguna

T. Hirano

Tokyo Institute of Technology

Jon M. Jenkins

NASA Ames Research Center

Petr Kabath

Astronomical Institute, Academy of Sciences of the Czech Republic v.v.i.

E. Knudstrup

Aarhus Universitet

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

S. Mathur

Instituto Astrofisico de Canarias

Universidad de la Laguna

S. E. Mullally

Massachusetts Institute of Technology (MIT)

Norio Narita

Instituto Astrofisico de Canarias

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Japan Science and Technology Agency

University of Tokyo

G. Nowak

Universidad de la Laguna

Instituto Astrofisico de Canarias

Henrik Olofsson

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Observationssupport

E. Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

Martin Pätzold

Universität zu Köln

E. Pompei

European Southern Observatory Santiago

H. Rauer

Technische Universität Berlin

Freie Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (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

Universita degli Studi di Torino

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

L. Spina

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

Monash University

J. Šubjak

Univerzita Karlova

Astronomical Institute, Academy of Sciences of the Czech Republic v.v.i.

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

Ämneskategorier

Subatomär fysik

Astronomi, astrofysik och kosmologi

Annan fysik

DOI

10.1093/mnras/staa2502

Mer information

Senast uppdaterat

2020-12-10