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

Universite de Geneve

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, Galaktisk astrofysik

N. C. Santos

Universidade do Porto

F. Dai

California Institute of Technology (Caltech)

V Adibekyan

Universidade do Porto

R. Luque

Instituto Astrofisico 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

Universite de Geneve

D. Kossakowski

Max-Planck-Gesellschaft

J. F. Otegi

Universite de Geneve

Universität Zürich

F. Murgas

Instituto Astrofisico de Canarias

Universidad de la Laguna

M. Stalport

Universite de Geneve

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)

MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave

J. N. Winn

Princeton University

J. M. Jenkins

NASA Ames Research Center

R. Allart

Universite de Geneve

J. M. Almenara

Universite de Geneve

D. Barrado

Ctr Astrobiol CSIC INTA

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

Universite de Geneve

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

MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave

C. Dorn

Leiden Observ

X. Dumusque

Universite de Geneve

R. A. Garcia

Université Paris Diderot

Université Paris-Saclay

L. Gonzalez-Cuesta

Universidad de la Laguna

Instituto Astrofisico de Canarias

S. Grziwa

Universität zu Köln

Iskra Georgieva

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

N. Guerrero

Massachusetts Institute of Technology (MIT)

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

R. Helled

Leiden Observ

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

Ctr Astrobiol CSIC INTA

T. A. Lopez

Aix-Marseille Université

J. Livingston

University of Tokyo

S. Mathur

Universidad de la Laguna

Instituto Astrofisico de Canarias

O. Mousis

Aix-Marseille Université

N. Narita

Ctr Astrobiol CSIC INTA

National Astronomical Observatory of Japan

Instituto Astrofisico de Canarias

Japan Science and Technology Agency

H. P. Osborn

Universität Bern

Aix-Marseille Université

E. Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. A. Pena Rojas

Universidad de Chile (UCH)

Carina Persson

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

S. N. Quinn

Harvard-Smithsonian Center for Astrophysics

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

FU Berlin

Technische Universität Berlin

S. Redfield

Wesleyan University

A. Santerne

Aix-Marseille Université

L. A. dos Santos

Universite de Geneve

Seidel

Universite de Geneve

S. G. Sousa

Universidade do Porto

E. B. Ting

NASA Ames Research Center

M. Turbet

Universite de Geneve

S. Udry

Universite de Geneve

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

Subatomär fysik

Astronomi, astrofysik och kosmologi

Annan fysik

DOI

10.1093/mnras/staa197

Mer information

Senast uppdaterat

2020-05-18