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 5399-5412Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1093/MNRAS/STAA197