TOI−757 b: an eccentric transiting mini−Neptune on a 17.5−d orbit
Artikel i vetenskaplig tidskrift, 2024
We report the spectroscopic confirmation and fundamental properties of TOI−757 b, a mini−Neptune on a 17.5−d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high−precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space−borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground−based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI−757 b has a radius of Rp = 2.5 ± 0.1R. and a mass of Mp = 10.5+−2212M, implying a bulk density of ρp = 3.6 ± 0.8 g cm−3. Our internal composition modelling was unable to constrain the composition of TOI−757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39+−000708, making it one of the very few highly eccentric planets among precisely characterized mini−Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI−757 b’s formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star−star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI−757.
techniques: photometric
planets and satellites: interiors
stars: individual: TOI-757 (TIC 130924120)
planets and satellites: composition
techniques: radial velocities
Författare
A. Alqasim
University College London (UCL)
N. Grieves
Université de Genève
N. M. Rosário
Universidade do Porto
D. Gandolfi
Universita degli Studi di Torino
J.H. Livingston
University of Tokyo
S.G. Sousa
Universidade do Porto
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
J. K. Teske
Carnegie Institution of Washington
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
J. A. Egger
Universität Bern
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Coel Hellier
Keele University
A. F. Lanza
Istituto nazionale di astrofisica (INAF)
Vincent Van Eylen
University College London (UCL)
F. Bouchy
Université de Genève
R.J. Oelkers
Texas A&M University
G. Srdoc
Kotizarovci Observatory
E. Goffo
Carnegie Observatories
T.G. Wilson
European Space Research and Technology Centre (ESA ESTEC)
E. Goffo
Universita degli Studi di Torino
L. Delrez
Technische Universität Graz
Ramotholo Sefako
Universita degli Studi di Torino
S.C.C. Barros
The University of Warwick
Kevin I. Collins
Stockholms universitet
A. Heitzmann
Tsinghua University
A. Bonfanti
Université de Genève
R. Alonso
Université de Genève
T. Bárczy
Universität Bern
D. Barrado Navascues
Universität Bern
W. Baumjohann
KU Leuven
W. Benz
Universidade do Porto
N. Billot
South African Astronomical Observatory
L. Borsato
Universidade do Porto
C. Broeg
George Mason University
R. Alonso
Aarhus Universitet
J. Asquier
European Space Research and Technology Centre (ESA ESTEC)
William D. Cochran
Universidad de la Laguna
A. Collier Cameron
Admatis
W. Baumjohann
Université de Genève
Szilard Csizmadia
Universität Bern
W. Benz
Universität Bern
Tansu Daylan
Université de Genève
M. Deleuil
European Space Astronomy Centre (ESAC)
B.O. Demory
Universität Bern
E. Bryant
University College London (UCL)
R.P. Butler
Carnegie Institution of Washington
William D. Cochran
Istituto nazionale di astrofisica (INAF)
A. Collier Cameron
The University of Texas at Austin
A. Correia
University of St Andrews
J.D. Crane
Carnegie Observatories
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. E. Cubillos
Université de Genève
M. B. Davies
Istituto nazionale di astrofisica (INAF)
Tansu Daylan
Lunds universitet
M. Deleuil
Washington University in St. Louis
A. Deline
Université de Genève
B.O. Demory
Universität Bern
A. Derekas
Laboratoire d'Astrophysique de Marseille
Billy Edwards
Eötvös Loránd University (ELTE)
D. Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Zahra Essack
Université de Genève
A. Fortier
Universität Bern
K. Gazeas
University of New Mexico
Michaël Gillon
Universität Bern
M. Gudel
University of Athens
J. Hasiba
Université de Genève
A. Hatzes
Thüringer Landessternwarte Tautenburg
Ch. Helling
Thüringer Landessternwarte Tautenburg
T. Hirano
Universität Wien
S.B. Howell
National Astronomical Observatory of Japan
S. Hoyer
Washington University in St. Louis
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
Jon M. Jenkins
National Astronomical Observatory of Japan
S. Kanodia
Carnegie Institution of Washington
L. L. Kiss
NASA Ames Research Center
Judith Korth
Eötvös Loránd University (ELTE)
K. W.F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Laskar
Lunds universitet
A. L. des Etangs
Observatoire de Paris
M. Lendl
Université de Genève
M. B. Lund
Institut d 'Astrophysique de Paris
R. Luque
California Institute of Technology (Caltech)
A. Mann
University of Chicago
D. Magrin
European Space Astronomy Centre (ESAC)
P. Maxted
Keele University
C. Mordasini
Universität Bern
D. Ehrenreich
Universität Wien
Zahra Essack
European Space Astronomy Centre (ESAC)
A. Fortier
Instituto de Astrofísica de Canarias
G. Olofsson
The University of Warwick
Michaël Gillon
Universität Bern
S.B. Howell
University College London (UCL)
S. Hoyer
European Southern Observatory (ESO)
K. Isaak
University of Athens
I. Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Aarhus Universitet
Judith Korth
Las Campanas Observatory
K. W.F. Lam
European Space Astronomy Centre (ESAC)
Valerio Nascimbeni
University of Athens
G. Olofsson
Università di Padova
H. P. Osborn
European Space Astronomy Centre (ESAC)
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
R. Ottensamer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I. Pagano
Freie Universität Berlin
E. Palle
Wesleyan University
G. Peter
Institut d'Estudis Espacials de Catalunya (IEEC)
Giampaolo P. Piotto
Uniwersytet Mikolaja Kopernika
M. Rieder
Universität Bern
Roberto Ragazzoni
Université de Genève
H. Rauer
Universidade do Porto
S. Redfield
Istituto nazionale di astrofisica (INAF)
I. Ribas
Uniwersytet Mikolaja Kopernika
D. Segransan
Université de Genève
George R. Ricker
Uniwersytet Mikolaja Kopernika
N. C. Santos
Universität Bern
Gaetano Scandariato
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Stalport
Universität Bern
D. Segransan
Laboratoire d'Astrophysique de Marseille
Avi Shporer
Carnegie Observatories
A.E. Simon
National Astronomical Observatory of Japan
Alexis M. S. Smith
Université de Genève
G.M. Szabó
Uniwersytet Mikolaja Kopernika
J. D. Twicken
Universite de Liège
S. Udry
Université de Genève
Roland K. Vanderspek
Aarhus Universitet
V. Van Grootel
Uniwersytet Mikolaja Kopernika
J. Venturini
European Space Astronomy Centre (ESAC)
V. Viotto
European Space Astronomy Centre (ESAC)
N. A. Walton
SETI Institute
J. N. Winn
University of Cambridge
S.W. Yee
Harvard-Smithsonian Center for Astrophysics
Monthly Notices of the Royal Astronomical Society
00358711 (ISSN) 13652966 (eISSN)
Vol. 533 1 1-26Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stae1767