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

planets and satellites: detection; planets and satellites:; individual: HD 136352; planets and satellites: general; Astrophysics -; Earth and Planetary Astrophysics

Abstract :

[en] 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 = 107.1361_−0.0022^+0.0019 days and T_c = 2459009.7759_−0.0096^+0.0101 BJD_TDB, 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.

Undetrended and detrended light curves are only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (ftp://130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/671/A154

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Ehrenreich, D.; University of Geneva, Astronomical Observatory, -

Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization

Akinsanmi, B.; University of Geneva, Astronomical Observatory

Wilson, T. G.; Scottish Universities Physics Alliance

Bonfanti, A.; Austrian Institute of Space Science Research

Beck, M.; University of Geneva, Astronomical Observatory

Benz, W.; University of Bern, Physics Institute, University of Bern, Switzerland

Hoyer, S.; Aix-Marseille Universite, Laboratoire d'Astrophysique

Queloz, D.; ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 2, 8093, Zurich, Switzerland, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK

Alibert, Y.; University of Bern, Physics Institute

More authors (83 more)

Language :

English

Title :

A full transit of v² Lupi d and the search for an exomoon in its Hill sphere with CHEOPS

Publication date :

01 March 2023

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, Fr

Volume :

671

Pages :

A154

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2023A&A...671A.154E

Available on ORBi :

since 16 May 2023

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