The planetary system around HD 190622 (TOI-1054): Measuring the gas content of low-mass planets orbiting F-stars
Artikel i vetenskaplig tidskrift, 2023
Context. Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constraints improve our understanding of planetary formation processes such as the delivery of volatile-rich planetesimals from beyond the ice line into the inner planetary system. Additional constraints may come from studies of the atmosphere, but almost all such studies of the atmosphere investigate the detection of certain species, and abundances are not routinely quantitatively measured. Aims. Accurate measurements of planetary bulk parameters-that is, mass and density-provide constraints on the inner structure and chemical composition of transiting planets. This information provides insight into properties such as the amounts of volatile species, which in turn can be related to formation and evolution processes. Methods. The Transiting Exoplanet Survey Satellite (TESS) reported a planetary candidate around HD 190622 (TOI-1054), which was subsequently validated and found to merit further characterization with photometric and spectroscopic facilities. The KESPRINT collaboration used data from the High Accuracy Radial Velocity Planet Searcher (HARPS) to independently confirm the planetary candidate, securing its mass, and revealing the presence of an outer giant planet in the system. The CHEOPS consortium invested telescope time in the transiting target in order to reduce the uncertainty on the radius, improving the characterization of the planet. Results. We present the discovery and characterization of the planetary system around HD 190622 (TOI-1054). This system hosts one transiting planet, which is smaller than Neptune (3.087-0.053+0.058REarth, 7.7 ± 1.0 MEarth) but has a similar bulk density (1.43 ± 0.21 g cm-3) and an orbital period of 16 days; and a giant planet, not known to be transiting, with a minimum mass of 227.0 ± 6.7 MEarth in an orbit with a period of 315 days. Conclusions. Our measurements constrain the structure and composition of the transiting planet. HD 190622b has singular properties among the known population of transiting planets, which we discuss in detail. Among the sub-Neptune-sized planets known today, this planet stands out because of its large gas content.
Planetary systems
Planets and satellites: detection
Författare
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. Gandolfi
Universita degli Studi di Torino
L. M. Serrano
Universita degli Studi di Torino
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. A. Egger
Universität Bern
Ph. Baumeister
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Krenn
Institut fur Weltraumforschung
W. Benz
Universität Bern
A. Deline
Université de Genève
H.-G. Florén
Stockholms universitet
A. Collier Cameron
University of St Andrews
V. Adibekyan
Universidade do Porto
Y. Alibert
Universität Bern
Salvatore E. Bellomo
Universita degli Studi di Torino
L. Delrez
Universite de Liège
L. Fossati
Institut fur Weltraumforschung
A. Fortier
Universität Bern
S. Grziwa
Universität zu Köln
S. Hoyer
Laboratoire d'Astrophysique de Marseille
A. Bonfanti
Institut fur Weltraumforschung
S. Salmon
Université de Genève
S.G. Sousa
Universidade do Porto
T.G. Wilson
University of St Andrews
Javier Alarcon
European Southern Observatory Santiago
R. Alonso
Instituto de Astrofísica de Canarias
G. Anglada Escude´
Consejo Nacional de Investigaciones Cientificas y Tecnicas
T. Bárczy
Admatis
O. Barragán
University of Oxford
D. Barrado
Centro de Astrobiologia (CAB)
S.C.C. Barros
Universidade do Porto
W. Baumjohann
Institut fur Weltraumforschung
M. Beck
Université de Genève
T. Beck
Universität Bern
L.M. Bernabò
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
N. Billot
Université de Genève
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Borsato
Istituto nazionale di astrofisica (INAF)
A. Brandeker
Stockholms universitet
C. Broeg
Universität Bern
O. Carrión-González
Technische Universität Berlin
S. Charnoz
Institut de Physique du Globe de Paris
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
William D. Cochran
The University of Texas at Austin
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
Kevin I. Collins
George Mason University
D. Conti
American Association of Variable Star Observers
Melvyn B. Davies
Lunds universitet
H. Deeg
Instituto de Astrofísica de Canarias
M. Deleuil
Laboratoire d'Astrophysique de Marseille
O. Demangeon
Universidade do Porto
B.O. Demory
Universität Bern
D. Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Esposito
Thüringer Landessternwarte Tautenburg
Malcolm Fridlund
Universiteit Leiden
Michaël Gillon
Universite de Liège
E. Goffo
Universita degli Studi di Torino
M. Gudel
Universität Wien
E. W. Guenther
Thüringer Landessternwarte Tautenburg
J. V. Harre
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Kevin Heng
Universität Bern
M.J. Hooton
University of Cambridge
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
Jon M. Jenkins
NASA Ames Research Center
L. Kiss
Magyar Tudomanyos Akademia
E. Knudstrup
Aarhus Universitet
K. W.F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Laskar
Observatoire de Paris
A. L. des Etangs
Centre national de la recherche scientifique (CNRS)
M. Lendl
Université de Genève
C. Lovis
Université de Genève
R. Luque
University of Chicago
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. Maxted
Keele University
Alexandra Muresan
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
G. Olofsson
Stockholms universitet
H. P. Osborn
Universität Bern
H. L.M. Osborne
University College London (UCL)
R. Ottensamer
Universität Wien
I. Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Giampaolo P. Piotto
Istituto nazionale di astrofisica (INAF)
Don L. Pollacco
The University of Warwick
D. Queloz
University of Cambridge
Roberto Ragazzoni
Istituto nazionale di astrofisica (INAF)
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Redfield
Wesleyan University
I. Ribas
Consejo Nacional de Investigaciones Cientificas y Tecnicas
George R. Ricker
Massachusetts Institute of Technology (MIT)
F. Rodler
European Southern Observatory Santiago
N. C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
S. Seager
Massachusetts Institute of Technology (MIT)
D. Segransan
Université de Genève
A.E. Simon
Universität Bern
A. M.S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Manfred B. Steller
Institut fur Weltraumforschung
G.M. Szabó
Eötvös Loránd University (ELTE)
Nicolas Thomas
Universität Bern
N. Tosi
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. D. Twicken
NASA Ames Research Center
S. Udry
Université de Genève
Vincent Van Eylen
University College London (UCL)
V. Van Grootel
Universite de Liège
N. A. Walton
University of Cambridge
J. N. Winn
Princeton University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 675 A183Ämneskategorier
Astronomi, astrofysik och kosmologi
Annan fysik
DOI
10.1051/0004-6361/202245774