An ultra-short period super-Earth and sub-Neptune spanning the Radius Valley orbiting the kinematic thick disc star TOI-2345
Artikel i vetenskaplig tidskrift, 2025
A crucial chemical link between stars and their orbiting exoplanets is thought to exist. If universal, this connection could affect the formation and evolution of all planets. Therefore, this potential vital link needs testing by characterizing exoplanets around chemically-diverse stars. We present the discovery of two planets orbiting the metal-poor, kinematic thick-disc K-dwarf TOI-2345. TOI-2345 b is a super-Earth with a period of 1.05 d and TOI-2345 c is a sub-Neptune with a period of 21 d. In addition to the target being observed in four TESS sectors, we obtained five CHEOPS visits and 26 radial velocities from HARPS. By conducting a joint analysis of all the data, we find TOI-2345 b to have a radius of 1.504+0.047-0.044 R⊕ and a mass of 3.49 ± 0.85 M⊕; and TOI-2345 c to have a radius of 2.451+0.045-0.046 R⊕ and a mass of 7.27+2.27-2.45 M⊕. To explore chemical links between these planets and their host star, we model their interior structures newly accounting for devolatized stellar abundances. TOI-2345 adds to the limited sample of well-characterized planetary systems around thick disc stars. This system challenges theories of formation and populations of planets around thick disc stars with its Ultra-Short Period super-Earth and the wide period distribution of these two planets spanning the radius valley.
planets and satellites: interiors
planets and satellites: individual: TOI-2345 b & c
planets and satellites: detection
techniques: photometric - techniques: radial velocities
stars: individual: TOI-2345
Författare
Yoshi Eschen
The University of Warwick
T.G. Wilson
The University of Warwick
A. Bonfanti
Institut fur Weltraumforschung
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
S.G. Sousa
Universidade do Porto
M. Lendl
Université de Genève
A. Heitzmann
Université de Genève
A.E. Simon
Universität Bern
Physics Institute
G. Olofsson
Stockholms universitet
A. Castro-González
Université de Genève
J. A. Egger
Physics Institute
L. Fossati
Institut fur Weltraumforschung
A. J. Mustill
Lunds universitet
H. P. Osborn
Universität Bern
Eidgenössische Technische Hochschule Zürich (ETH)
Hugo G. Vivien
Laboratoire d'Astrophysique de Marseille
Y. Alibert
Universität Bern
Physics Institute
R. Alonso
Universidad de la Laguna
Instituto de Astrofísica de Canarias
T. Bárczy
Admatis
D. Barrado
Europeiska rymdorganisationen (ESA)
S.C.C. Barros
Universidade do Porto
W. Baumjohann
Institut fur Weltraumforschung
W. Benz
Universität Bern
Physics Institute
N. Billot
Université de Genève
L. Borsato
Istituto nazionale di astrofisica (INAF)
A. Brandeker
Stockholms universitet
C. Broeg
Physics Institute
Universität Bern
M. Buder
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. A. Caldwell
SETI Institute
National Aeronautics and Space Administration (NASA)
A. Collier Cameron
University of St Andrews
A. Correia
Universidade de Coimbra
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. E. Cubillos
Istituto nazionale di astrofisica (INAF)
Institut fur Weltraumforschung
Melvyn B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
A. Deline
Université de Genève
O. Demangeon
Universidade do Porto
B.O. Demory
Universität Bern
Physics Institute
A. Derekas
Eötvös Loránd University (ELTE)
Billy Edwards
Netherlands Institute for Space Research (SRON)
D. Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Farinato
Istituto nazionale di astrofisica (INAF)
A. Fortier
Universität Bern
Physics Institute
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
D. Gandolfi
Universita degli Studi di Torino
K. Gazeas
University of Athens
Michaël Gillon
Universite de Liège
Robert Goeke
Massachusetts Institute of Technology (MIT)
M. Gudel
Universität Wien
Maximilian N. Günther
Europeiska rymdorganisationen (ESA)
J. Hasiba
Institut fur Weltraumforschung
Ch. Helling
Technische Universität Graz
Institut fur Weltraumforschung
K. Isaak
Europeiska rymdorganisationen (ESA)
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
Tatiana Keller
Physics Institute
Universität Bern
L. L. Kiss
Eötvös Loránd University (ELTE)
Research Centre For Astronomy and Earth Sciences
D. Kitzmann
Physics Institute
Universität Bern
Judith Korth
Université de Genève
K. W.F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Laskar
Observatoire de Paris
A. L. des Etangs
Institut d 'Astrophysique de Paris
A. Leleu
Physics Institute
Université de Genève
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. Maxted
Keele University
Bruno Merín
Europeiska rymdorganisationen (ESA)
C. Mordasini
Physics Institute
Universität Bern
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
Universität Wien
I. Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. Piazza
Universität Bern
Giampaolo P. Piotto
Università di Padova
Istituto nazionale di astrofisica (INAF)
Don L. Pollacco
The University of Warwick
D. Queloz
University of Cambridge
Eidgenössische Technische Hochschule Zürich (ETH)
Roberto Ragazzoni
Istituto nazionale di astrofisica (INAF)
Università di Padova
N. Rando
Europeiska rymdorganisationen (ESA)
F. Ratti
Europeiska rymdorganisationen (ESA)
H. Rauer
Freie Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I. Ribas
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Consejo Superior de Investigaciones Científicas (CSIC)
N. C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
Université de Genève
Avi Shporer
Massachusetts Institute of Technology (MIT)
A. M.S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Stalport
Universite de Liège
S. Sulis
Laboratoire d'Astrophysique de Marseille
G.M. Szabó
Eötvös Loránd University (ELTE)
HUN-REN-ELTE Exoplanet Research Group
S. Udry
Université de Genève
S. Ulmer-Moll
Universite de Liège
Universiteit Leiden
V. Van Grootel
Universite de Liège
J. Venturini
Université de Genève
E. Villaver
Universidad de la Laguna
Instituto de Astrofísica de Canarias
N. A. Walton
University of Cambridge
David Watanabe
Planetary Discoveries
S. Wolf
Physics Institute
C. Ziegler
Stephen F. Austin State University
Monthly Notices of the Royal Astronomical Society
00358711 (ISSN) 13652966 (eISSN)
Vol. 544 2 2614-2636Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/staf1806