• DOI:10.1051/0004-6361/202244790
• Corpus ID: 256598325

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

@article{Ehrenreich2023AFT,
  title={A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS,},
  author={David Ehrenreich and Laetitia Delrez and Babatunde Akinsanmi and Thomas G. Wilson and A. Bonfanti and M. Beck and W. Benz and Sergio Hoyer and D. Queloz and Yann Alibert and S. Charnoz and Andrew Collier Cameron and Adrien Deline and Matthew J. Hooton and Monika Lendl and Goeran Olofsson and S{\'e}rgio G. Sousa and Vardan Adibekyan and Rosa M. Alonso and G. Anglada and David Barrado and Susana C. C. Barros and Wolfgang Baumjohann and Thomas Beck and Anja Bekkelien and Maria Bergomi and Nicolas Billot and Xavier Bonfils and Alexis Brandeker and Christopher Broeg and T. B'arczy and Zachory K. Berta-Thompson and J. Cabrera and Carlos Corral van Damme and Szil{\'a}rd Csizmadia and Michael Benedict Davies and Magali Deleuil and Olivier D. S. Demangeon and B-O. Demory and John P. Doty and Alex Erikson and Michael M. Fausnaugh and H. G. Flor'en and Andrea Fortier and L. Fossati and Malcolm Fridlund and David Futyan and D Gandolfi and Micha{\"e}l Gillon and Pascal Guterman and Manuel Gudel and Kevin Heng and Kate Gudrun Isaak and A. Jackel and Jon M. Jenkins and L{\'a}szl{\'o} L. Kiss and Jacques Laskar and David W. Latham and A. Lecavelier des {\'E}tangs and Alan M. Levine and Cristophe Lovis and Demetrio Magrin and P. F. L. Maxted and Edward H. Morgan and Valerio Nascimbeni and Hugh P. Osborn and Roland Ottensamer and Isabella Pagano and E. Pall'e and Gao Peter and Giampaolo Piotto and Don Pollacco and R. Ragazzoni and Nicola Rando and Heike Rauer and I. Ribas and George R. Ricker and S'ebastien Salmon and N. C. Santos and Gaetano Scandariato and A E Simon and A. M. S. Smith and Michaela Steinberger and Manfred Steller and Gy. M. Szab'o and D. S'egransan and Avi Shporer and Nicolas Thomas and Matthias Tschentscher and St{\'e}phane Udry and Roland K. Vanderspek and Val{\'e}rie Van Grootel and Nancy A. Walton},
  journal={Astronomy \& Astrophysics},
  year={2023}
}

• D. Ehrenreich, L. Delrez, +90 authors N. Walton
• Published 3 February 2023
• Physics, Geology
• Astronomy & Astrophysics

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 Tc = 2459009.7759−0.0096+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.