A full transit of v 2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
Artikel i vetenskaplig tidskrift, 2023
The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). The TESS and CHEOPS missions revealed that all three planets are transiting and have radii straddling the radius gap separating volatile-rich and volatile-poor super-earths. Only a partial transit of planet d had been covered so we re-observed an inferior conjunction of the long-period 8.6 M⊕ exoplanet v2 Lup d with the CHEOPS space telescope. We confirmed its transiting nature by covering its whole 9.1 h transit for the first time. We refined the planet transit ephemeris to P = 107.13610.0022+0.0019 days and Tc = 2459009.77590.0096+0.0101 BJDTDB, improving by ~40 times on the previously reported transit timing uncertainty. This refined ephemeris will enable further follow-up of this outstanding long-period transiting planet to search for atmospheric signatures or explore the planet s Hill sphere in search for an exomoon. In fact, the CHEOPS observations also cover the transit of a large fraction of the planet s Hill sphere, which is as large as the Earth s, opening the tantalising possibility of catching transiting exomoons. We conducted a search for exomoon signals in this single-epoch light curve but found no conclusive photometric signature of additional transiting bodies larger than Mars. Yet, only a sustained follow-up of v2 Lup d transits will warrant a comprehensive search for a moon around this outstanding exoplanet.
Planets and satellites: general
Planets and satellites: individual: HD 136352
Planets and satellites: detection
Författare
D. Ehrenreich
Université de Genève
L. Delrez
Universite de Liège
B. Akinsanmi
Université de Genève
T. G. Wilson
University of St Andrews
A. Bonfanti
Institut fur Weltraumforschung
M. Beck
Université de Genève
W. Benz
Universität Bern
S. Hoyer
Laboratoire d'Astrophysique de Marseille
D. Queloz
Eidgenössische Technische Hochschule Zürich (ETH)
University of Cambridge
Y. Alibert
Universität Bern
S. Charnoz
Institut de Physique du Globe de Paris
A. Collier Cameron
Universite de Liège
A. Deline
Université de Genève
M.J. Hooton
University of Cambridge
Universität Bern
M. Lendl
Université de Genève
G. Olofsson
Stockholms universitet
S. G. Sousa
Universidade do Porto
V. Adibekyan
Universidade do Porto
R. Alonso
Instituto de Astrofísica de Canarias
G. Anglada
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Consejo Superior de Investigaciones Científicas (CSIC)
D. Barrado
Centro de Astrobiologia (CAB)
S.C.C. Barros
Universidade do Porto
W. Baumjohann
Institut fur Weltraumforschung
T. Beck
Universität Bern
A. Bekkelien
Université de Genève
M. Bergomi
Istituto nazionale di astrofisica (INAF)
N. Billot
Université de Genève
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
A. Brandeker
Stockholms universitet
C. Broeg
Universität Bern
T. Bárczy
Admatis
Z. K. Berta-Thompson
University of Colorado at Boulder
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
C. Corral Van Damme
European Space Research and Technology Centre (ESA ESTEC)
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
O. Demangeon
Universidade do Porto
B.O. Demory
Universität Bern
J. P. Doty
Noqsi Aerospace Ltd.
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Michael Fausnaugh
Massachusetts Institute of Technology (MIT)
H.-G. Florén
Stockholms universitet
A. Fortier
Universität Bern
L. Fossati
Institut fur Weltraumforschung
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
D. Futyan
Université de Genève
D. Gandolfi
Universita degli Studi di Torino
Michaël Gillon
Universite de Liège
P. Guterman
Laboratoire d'Astrophysique de Marseille
CS20330
M. Gudel
Universität Wien
Kevin Heng
The University of Warwick
Universität Bern
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
A. Jäckel
Universität Bern
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
L.L. Kiss
Magyar Tudomanyos Akademia
Eötvös Loránd University (ELTE)
J. Laskar
Observatoire de Paris
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
A. L. des Etangs
Institut d 'Astrophysique de Paris
A. M. Levine
Massachusetts Institute of Technology (MIT)
C. Lovis
Université de Genève
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. Maxted
Keele University
E. H. Morgan
Massachusetts Institute of Technology (MIT)
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
H. P. Osborn
Massachusetts Institute of Technology (MIT)
Universität Bern
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
Istituto nazionale di astrofisica (INAF)
Università di Padova
D. Pollacco
The University of Warwick
Roberto Ragazzoni
Università di Padova
Istituto nazionale di astrofisica (INAF)
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
H. Rauer
Technische Universität Berlin
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)
G. R. Ricker
Massachusetts Institute of Technology (MIT)
S. Salmon
Université de Genève
N. C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
A.E. Simon
Universität Bern
A. M.S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Steinberger
Institut fur Weltraumforschung
Manfred B. Steller
Institut fur Weltraumforschung
Gy M. Szabó
Eötvös Loránd University (ELTE)
D. Segransan
Université de Genève
Avi Shporer
Massachusetts Institute of Technology (MIT)
N. Thomas
Universität Bern
M. Tschentscher
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Udry
Université de Genève
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
V. Van Grootel
Universite de Liège
N. A. Walton
University of Cambridge
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 671 A154Ämneskategorier (SSIF 2011)
Subatomär fysik
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202244790