A full transit of v ²Lupi d and the search for an exomoon in its Hill sphere with CHEOPS

Autor(en)

D. Ehrenreich, L. Delrez, B. Akinsanmi, T. G. Wilson, A. Bonfanti, M. Beck, W. Benz, S. Hoyer, D. Queloz, Y. Alibert, S. Charnoz, A. Collier Cameron, A. Deline, M. Hooton, M. Lendl, G. Olofsson, S. G. Sousa, V. Adibekyan, R. Alonso, G. Anglada, D. Barrado, S. C.C. Barros, W. Baumjohann, T. Beck, A. Bekkelien, M. Bergomi, N. Billot, X. Bonfils, A. Brandeker, C. Broeg, T. Bárczy, Z. K. Berta-Thompson, J. Cabrera, C. Corral Van Damme, S. Csizmadia, M. B. Davies, M. Deleuil, O. Demangeon, B. O. Demory, J. P. Doty, A. Erikson, M. M. Fausnaugh, H. G. Florén, A. Fortier, L. Fossati, M. Fridlund, D. Futyan, D. Gandolfi, M. Gillon, P. Guterman, M. Güdel, K. Heng, K. G. Isaak, A. Jäckel, J. M. Jenkins, L. L. Kiss, J. Laskar, D. W. Latham, A. Lecavelier Des Etangs, A. M. Levine, C. Lovis, D. Magrin, P. F.L. Maxted, E. H. Morgan, V. Nascimbeni, H. P. Osborn, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, G. Piotto, D. Pollacco, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, G. R. Ricker, S. Salmon, N. C. Santos, G. Scandariato, A. E. Simon, A. M.S. Smith, M. Steinberger, M. Steller, G. M. Szabó, D. Ségransan, A. Shporer, N. Thomas, M. Tschentscher, S. Udry, R. Vanderspek, V. Van Grootel, N. A. Walton

Abstrakt

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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Universität Genf, Université de Liège, University of St. Andrews, Österreichische Akademie der Wissenschaften (ÖAW), Universität Bern, Aix-Marseille Université, Eidgenössische Technische Hochschule Zürich, University of Cambridge, Université de Paris, Stockholm University, Universidade do Porto, Instituto de Astrofísica de Canarias (IAC), Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), European Space Astronomy Centre (ESA), INAF - Osservatorio Astronomico di Padova, Université Grenoble-Alpes, Admatis, University of Colorado, Boulder, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), European Space Research & Technology Centre (ESA/ESTEC), Lund University, Noqsi Aerospace Ltd., Massachusetts Institute of Technology, Leiden University, Chalmers University of Technology, Università degli Studi di Torino, National Institute for Earth Sciences & Astronomy (INSU-CNRS), University of Warwick, National Aeronautics & Space Administration (NASA), MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, Université de recherche Paris Sciences et Lettres, Harvard-Smithsonian Center for Astrophysics, Université Paris VI - Pierre-et-Marie-Curie, Keele University, INAF-Osservatorio Astrofisico di Catania, Università degli Studi di Padova, Technische Universität Berlin, Freie Universität Berlin (FU)

Journal

Astronomy and Astrophysics

Band

671

Anzahl der Seiten

16

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/202244790

Publikationsdatum

03-2023

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ed514dc8-2154-4c91-b01a-d5aa601f7594