Mass determinations of the three mini-Neptunes transiting TOI-125
Artikel i vetenskaplig tidskrift, 2020

The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission's primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS's observations were focused on the southern ecliptic hemisphere, resulting in the discovery of three mini-Neptunes orbiting the star T01-125, a V = 11,0 KO dwarf. We present intensive HARPS radial velocity observations, yielding precise mass measurements for TO1-125b, TOI-125c, and TOI-125d. TOI-125b has an orbital period of 4,65 d, a radius of 2,726 + 0,075 RE, a mass of 9,50 0,88 ME, and is near the 2:1 mean motion resonance with TOI-125c at 9.15 d. TOI-125c has a similar radius of 2,759 0.10 RE and a mass of 6,63 + 0,99 ME, being the puffiest of the three planets. T01-125d has an orbital period of 19,98 d and a radius of 2.93 + 0,17 RE and mass 13,6 1,2 ME, For T01-125b and d, we find unusual high eccentricities of 0.19 0.04 and 0.17+(c):(!,(, respectively. Our analysis also provides upper mass limits for the two low-SNR planet candidates in the system; for T01-125.04 (Rp = 1.36 RE, P = 0.53 d), we find a 2a upper mass limit of 1.6 ME, whereas T01-125.05 (RP = 4.2-'2E44 RE, P = 13.28 d) is unlikely a viable planet candidate with an upper mass limit of 2.7 ME. We discuss the internal structure of the three confirmed planets, as well as dynamical stability and system architecture for this intriguing exoplanet system.

Planets and satellites: detection

Planets and satellites: individual: (TOI-125, TIC 52368076)

Författare

L. D. Nielsen

Université de Genève

D. Gandolfi

Universita degli Studi di Torino

D. J. Armstrong

The University of Warwick

J. S. Jenkins

Universidad de Chile (UCH)

Malcolm Fridlund

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

N. C. Santos

Universidade do Porto

F. Dai

California Institute of Technology (Caltech)

V Adibekyan

Universidade do Porto

R. Luque

Instituto de Astrofísica de Canarias

Universidad de la Laguna

J. H. Steffen

University of Nevada, Las Vegas

M. Esposito

Thüringer Landessternwarte Tautenburg

F. Meru

The University of Warwick

S. Sabotta

Thüringer Landessternwarte Tautenburg

E. Bolmont

Université de Genève

D. Kossakowski

Max-Planck-Gesellschaft

J. F. Otegi

Université de Genève

Universität Zürich

F. Murgas

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Stalport

Université de Genève

F. Rodler

European Southern Observatory Santiago

M. R. Diaz

Universidad de Chile (UCH)

N. T. Kurtovic

Universidad de Chile (UCH)

G. Ricker

Massachusetts Institute of Technology (MIT)

R. Vanderspek

Massachusetts Institute of Technology (MIT)

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

S. Seager

Massachusetts Institute of Technology (MIT)

J. N. Winn

Princeton University

J. M. Jenkins

NASA Ames Research Center

R. Allart

Université de Genève

J. M. Almenara

Université de Genève

D. Barrado

Centro de Astrobiología (INTA-CSIC)

S.C.C. Barros

Universidade do Porto

D. Bayliss

The University of Warwick

Z. M. Berdinas

Universidad de Chile (UCH)

I Boisse

Aix-Marseille Université

F. Bouchy

Université de Genève

P. Boyd

NASA Goddard Space Flight Center

D. J. A. Brown

The University of Warwick

E. M. Bryant

The University of Warwick

C. Burke

Massachusetts Institute of Technology (MIT)

W. D. Cochran

The University of Texas at Austin

B. F. Cooke

The University of Warwick

O. D. S. Demangeon

Universidade do Porto

R. F. Diaz

Universidad de Buenos Aires

J. Dittman

Massachusetts Institute of Technology (MIT)

C. Dorn

Universiteit Leiden

X. Dumusque

Université de Genève

R. A. Garcia

Université Paris Diderot

Université Paris-Saclay

L. Gonzalez-Cuesta

Instituto de Astrofísica de Canarias

Universidad de la Laguna

S. Grziwa

Universität zu Köln

Iskra Georgieva

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

N. Guerrero

Massachusetts Institute of Technology (MIT)

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

R. Helled

Universiteit Leiden

C. E. Henze

NASA Ames Research Center

S. Hojjatpanah

Universidade do Porto

J. Korth

Universität zu Köln

K. W. F. Lam

Technische Universität Berlin

J. Lillo-Box

Centro de Astrobiología (INTA-CSIC)

T. A. Lopez

Aix-Marseille Université

J. Livingston

University of Tokyo

S. Mathur

Universidad de la Laguna

Instituto de Astrofísica de Canarias

O. Mousis

Aix-Marseille Université

N. Narita

Centro de Astrobiología (INTA-CSIC)

National Astronomical Observatory of Japan

Instituto de Astrofísica de Canarias

Japan Science and Technology Agency

H. P. Osborn

Universität Bern

Aix-Marseille Université

E. Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

P. A. Pena Rojas

Universidad de Chile (UCH)

Carina Persson

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

S. N. Quinn

Harvard-Smithsonian Center for Astrophysics

H. Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Freie Universität Berlin

S. Redfield

Wesleyan University

A. Santerne

Aix-Marseille Université

L. A. dos Santos

Université de Genève

Seidel

Université de Genève

S. G. Sousa

Universidade do Porto

E. B. Ting

NASA Ames Research Center

M. Turbet

Université de Genève

S. Udry

Université de Genève

A. Vanderburg

The University of Texas at Austin

V. Van Eylen

University College London (UCL)

Vines

Universidad de Chile (UCH)

P. J. Wheatley

The University of Warwick

P. A. Wilson

The University of Warwick

Monthly Notices of the Royal Astronomical Society

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

Vol. 492 4 5399-5412

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1093/MNRAS/STAA197

Mer information

Senast uppdaterat

2021-04-15