Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops
Artikel i vetenskaplig tidskrift, 2023
HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R (HIP 9618 b) and 3.343 ± 0.039 R (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M for HIP 9618 b, which, according to our interior structure models, corresponds to a 6.8 ± 1.4 per cent gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion (0.08+−000512M☉) orbiting at 26.0+−111900 au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.
surveys
occultations
planets and satellites: detection
eclipses
binaries: spectroscopic
Författare
H. P. Osborn
Massachusetts Institute of Technology (MIT)
Universität Bern
G. Nowak
Uniwersytet Mikolaja Kopernika
Universidad de la Laguna
Instituto de Astrofísica de Canarias
G. Hebrard
Institut d 'Astrophysique de Paris
T. Masseron
Universidad de la Laguna
Instituto de Astrofísica de Canarias
J. Lillo-Box
Europeiska rymdorganisationen (ESA)
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
A. Bekkelien
Université de Genève
H.-G. Florén
Stockholms universitet
P. Guterman
Laboratoire d'Astrophysique de Marseille
A.E. Simon
Universität Bern
V. Adibekyan
Universidade do Porto
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
L. Borsato
Istituto nazionale di astrofisica (INAF)
A. Brandeker
Stockholms universitet
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
A. Collier Cameron
University of St Andrews
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
J. A. Egger
Universität Bern
D. Gandolfi
Universita degli Studi di Torino
M.J. Hooton
Universität Bern
University of Cambridge
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
M. Lendl
Université de Genève
E. C. Matthews
Université de Genève
Max-Planck-Gesellschaft
A. Tuson
University of Cambridge
S. Ulmer-Moll
Université de Genève
A. Vanderburg
Massachusetts Institute of Technology (MIT)
T.G. Wilson
University of St Andrews
C. Ziegler
Stephen F. Austin State University
Y. Alibert
Universität Bern
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Anglada
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
L. Arnold
Centre national de la recherche scientifique (CNRS)
J. Asquier
Europeiska rymdorganisationen (ESA)
D. Barrado Y Navascues
Centro de Astrobiologia (CAB)
W. Baumjohann
Institut fur Weltraumforschung
T. Beck
Universität Bern
A. A. Belinski
Moscow State University
W. Benz
Universität Bern
F. Biondi
Istituto nazionale di astrofisica (INAF)
Max-Planck-Gesellschaft
I. Boisse
Laboratoire d'Astrophysique de Marseille
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
C. Broeg
Universität Bern
L. A. Buchhave
Danmarks Tekniske Universitet (DTU)
T. Bárczy
Admatis
S.C.C. Barros
Universidade do Porto
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
C. Cardona Guillen
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Ilaria Carleo
Universidad de la Laguna
Instituto de Astrofísica de Canarias
A. Castro-González
Europeiska rymdorganisationen (ESA)
S. Charnoz
Institut de Physique du Globe de Paris
Jessie L. Christiansen
National Aeronautics and Space Administration (NASA)
Pía Cortés-Zuleta
Laboratoire d'Astrophysique de Marseille
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Dalal
Institut d 'Astrophysique de Paris
M. B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
X. Delfosse
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Delrez
Universite de Liège
B.O. Demory
Universität Bern
A. B. Dunlavey
National Aeronautics and Space Administration (NASA)
D. Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
R. B. Fernandes
University of Arizona
A. Fortier
Universität Bern
T. Forveille
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Fossati
Institut fur Weltraumforschung
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Michaël Gillon
Universite de Liège
Robert Goeke
Massachusetts Institute of Technology (MIT)
M. V. Goliguzova
Moscow State University
E. Gonzales
University of California
Maximilian N. Günther
Europeiska rymdorganisationen (ESA)
M. Gudel
Universität Wien
N. Heidari
Laboratoire d'Astrophysique de Marseille
C. E. Henze
National Aeronautics and Space Administration (NASA)
S. B. Howell
National Aeronautics and Space Administration (NASA)
S. Hoyer
Laboratoire d'Astrophysique de Marseille
J. I. Frey
Universität Bern
K. Isaak
Europeiska rymdorganisationen (ESA)
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
F. Kiefer
Observatoire de Paris
Institut d 'Astrophysique de Paris
L.L. Kiss
Magyar Tudomanyos Akademia
Eötvös Loránd University (ELTE)
Judith Korth
Lunds universitet
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
P. Maxted
Keele University
J. Laskar
Observatoire de Paris
A. L. des Etangs
Institut d 'Astrophysique de Paris
C. Lovis
Université de Genève
M. B. Lund
National Aeronautics and Space Administration (NASA)
R. Luque
University of Chicago
D. Magrin
Istituto nazionale di astrofisica (INAF)
J. M. Almenara
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
E. Martioli
Institut d 'Astrophysique de Paris
Laboratorio Nacional de Astrofisica, Itajuba
M. Mecina
Universität Wien
J. V. Medina
Space Telescope Science Institute (STScI)
D. Moldovan
Google Inc.
M. Morales-Calderon
Europeiska rymdorganisationen (ESA)
Giuseppe Morello
Instituto de Astrofísica de Canarias
Universidad de la Laguna
C. Moutou
Institut de Recherche en Astrophysique et Planétologie (IRAP)
F. Murgas
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Eric L.N. Jensen
Swarthmore College
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 523 2 3069-3089Satellitstudier av exoplaneters mångfald
Rymdstyrelsen (174/18), 2019-02-04 -- 2023-08-01.
Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stad1319