Mass determinations of the three mini-Neptunes transiting TOI-125
Journal article, 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: individual: (TOI-125, TIC 52368076)
Planets and satellites: detection
Author
L. D. Nielsen
University of Geneva
D. Gandolfi
University of Turin
D. J. Armstrong
The University of Warwick
J. S. Jenkins
University of Chile (UCH)
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
N. C. Santos
University of Porto
F. Dai
California Institute of Technology (Caltech)
V Adibekyan
University of Porto
R. Luque
University of La Laguna
Instituto Astrofisico de Canarias
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
University of Geneva
D. Kossakowski
Max Planck Society
J. F. Otegi
University of Geneva
University of Zürich
F. Murgas
Instituto Astrofisico de Canarias
University of La Laguna
M. Stalport
University of Geneva
F. Rodler
European Southern Observatory Santiago
M. R. Diaz
University of Chile (UCH)
N. T. Kurtovic
University of 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
University of Geneva
J. M. Almenara
University of Geneva
D. Barrado
Spanish Astrobiology Center (INTA-CSIC)
S.C.C. Barros
University of Porto
D. Bayliss
The University of Warwick
Z. M. Berdinas
University of Chile (UCH)
I Boisse
Aix Marseille University
F. Bouchy
University of Geneva
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
University of Porto
R. F. Diaz
Universidad de Buenos Aires
J. Dittman
Massachusetts Institute of Technology (MIT)
C. Dorn
Leiden University
X. Dumusque
University of Geneva
R. A. Garcia
University Paris-Saclay
Paris Diderot University
L. Gonzalez-Cuesta
Instituto Astrofisico de Canarias
University of La Laguna
S. Grziwa
University of Cologne
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
N. Guerrero
Massachusetts Institute of Technology (MIT)
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
R. Helled
Leiden University
C. E. Henze
NASA Ames Research Center
S. Hojjatpanah
University of Porto
J. Korth
University of Cologne
K. W. F. Lam
Technische Universität Berlin
J. Lillo-Box
Spanish Astrobiology Center (INTA-CSIC)
T. A. Lopez
Aix Marseille University
J. Livingston
University of Tokyo
S. Mathur
Instituto Astrofisico de Canarias
University of La Laguna
O. Mousis
Aix Marseille University
N. Narita
National Astronomical Observatory of Japan
Japan Science and Technology Agency
Spanish Astrobiology Center (INTA-CSIC)
Instituto Astrofisico de Canarias
H. P. Osborn
Aix Marseille University
University of Bern
E. Palle
Instituto Astrofisico de Canarias
University of La Laguna
P. A. Pena Rojas
University of Chile (UCH)
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
S. N. Quinn
Harvard-Smithsonian Center for Astrophysics
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
Freie Universität Berlin
S. Redfield
Wesleyan University
A. Santerne
Aix Marseille University
L. A. dos Santos
University of Geneva
Seidel
University of Geneva
S. G. Sousa
University of Porto
E. B. Ting
NASA Ames Research Center
M. Turbet
University of Geneva
S. Udry
University of Geneva
A. Vanderburg
The University of Texas at Austin
V. Van Eylen
University College London (UCL)
Vines
University of 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 5399-5412Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1093/mnras/staa197