TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906
Artikel i vetenskaplig tidskrift, 2023
We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ∼ 734 d, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS, and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24 ± 0.08 R and a period of 10.924709 ± 0.000032 d, whilst HD 15906 c has a radius of 2.93+−000607 R and a period of 21.583298+−00000055000052 d. Assuming zero bond albedo and full day-night heat redistribution, the inner and outer planet have equilibrium temperatures of 668 ± 13 K and 532 ± 10 K, respectively. The HD 15906 system has become one of only six multiplanet systems with two warm (700 K) sub-Neptune sized planets transiting a bright star (G ≤ 10 mag). It is an excellent target for detailed characterization studies to constrain the composition of sub-Neptune planets and test theories of planet formation and evolution.
planets and satellites: fundamental parameters
planets and satellites: detection
stars: individual: HD 15906 (TOI 461, TIC 4646810)
techniques: photometric
stars: fundamental parameters
Författare
A. Tuson
University of Cambridge
D. Queloz
University of Cambridge
Eidgenössische Technische Hochschule Zürich (ETH)
H. P. Osborn
Universität Bern
Massachusetts Institute of Technology (MIT)
T.G. Wilson
University of St Andrews
M.J. Hooton
University of Cambridge
Universität Bern
M. Beck
Université de Genève
M. Lendl
Université de Genève
G. Olofsson
Stockholms universitet
A. Fortier
Universität Bern
A. Bonfanti
Institut fur Weltraumforschung
A. Brandeker
Stockholms universitet
L. A. Buchhave
Danmarks Tekniske Universitet (DTU)
A. Collier Cameron
University of St Andrews
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
D. Gandolfi
Universita degli Studi di Torino
Z. Garai
Eötvös Loránd University (ELTE)
Slovak Academy of Sciences
S. Giacalone
University of California
J. Gomes da Silva
Universidade do Porto
S. B. Howell
NASA Ames Research Center
J. A. Patel
Stockholms universitet
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
L. M. Serrano
Universita degli Studi di Torino
S. G. Sousa
Universidade do Porto
S. Ulmer-Moll
Université de Genève
Universität Bern
A. Vanderburg
Massachusetts Institute of Technology (MIT)
C. Ziegler
Stephen F. Austin State University
Y. Alibert
Universität Bern
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Anglada
Institut d'Estudis Espacials de Catalunya (IEEC)
Institut de Ciències de l'Espai (ICE) - CSIC
T. Bárczy
Admatis
D. Barrado Navascues
Centro de Astrobiologia (CAB)
S.C.C. Barros
Universidade do Porto
W. Baumjohann
Institut fur Weltraumforschung
T. Beck
Universität Bern
W. Benz
Universität Bern
N. Billot
Université de Genève
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Borsato
Istituto nazionale di astrofisica (INAF)
C. Broeg
Universität Bern
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Charnoz
Institut de Physique du Globe de Paris
D. Conti
American Association of Variable Star Observers
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. E. Cubillos
Institut fur Weltraumforschung
Istituto nazionale di astrofisica (INAF)
M. B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
L. Delrez
Universite de Liège
O. Demangeon
Universidade do Porto
B.O. Demory
Universität Bern
D. Dragomir
University of New Mexico
Courtney D. Dressing
University of California
D. Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Zahra Essack
Massachusetts Institute of Technology (MIT)
J. Farinato
Istituto nazionale di astrofisica (INAF)
L. Fossati
Institut fur Weltraumforschung
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Elise Furlan
National Aeronautics and Space Administration (NASA)
H. Gill
University of California
Michaël Gillon
Universite de Liège
Crystal Gnilka
NASA Ames Research Center
E. Gonzales
University of California
M. Gudel
Universität Wien
Maximilian N. Günther
European Space Research and Technology Centre (ESA ESTEC)
S. Hoyer
Laboratoire d'Astrophysique de Marseille
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
Jon M. Jenkins
NASA Ames Research Center
L.L. Kiss
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
J. Laskar
Observatoire de Paris
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
N. Law
The University of North Carolina System
A. L. des Etangs
Institut d 'Astrophysique de Paris
G. Lo Curto
European Southern Observatory Santiago
C. Lovis
Université de Genève
R. Luque
University of Chicago
D. Magrin
Istituto nazionale di astrofisica (INAF)
A. Mann
The University of North Carolina System
P. Maxted
Keele University
Michel Mayor
Université de Genève
S. McDermott
Protologic LLC
M. Mecina
Universität Wien
C. Mordasini
Universität Bern
A. Mortier
University of Birmingham
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
Universität Wien
I. Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Giampaolo P. Piotto
Università di Padova
Istituto nazionale di astrofisica (INAF)
D. Pollacco
The University of Warwick
T. Pritchard
NASA Goddard Space Flight Center
Roberto Ragazzoni
Università di Padova
Istituto nazionale di astrofisica (INAF)
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
F. Ratti
European Space Research and Technology Centre (ESA ESTEC)
H. Rauer
Technische Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Freie Universität Berlin
I. Ribas
Institut de Ciències de l'Espai (ICE) - CSIC
Institut d'Estudis Espacials de Catalunya (IEEC)
George R. Ricker
Massachusetts Institute of Technology (MIT)
M. Rieder
Universität Bern
N. C. Santos
Universidade do Porto
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 523 2 3090-3118Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stad1369