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

Journal
Date Issued
2023
Author(s)
Ehrenreich, D.
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Delrez, L.
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Akinsanmi, B.
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Wilson, T.G.
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Bonfanti, A.
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Beck, M.
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Benz, W.
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Hoyer, S.
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Queloz, D.
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Alibert, Y.
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Charnoz, S.
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Collier Cameron, A.
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Deline, A.
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Hooton, M.
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Lendl, M.
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Olofsson, G.
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Sousa, S.G.
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Adibekyan, V.
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Alonso, R.
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Anglada, G.
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Barrado, D.
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Barros, S.C.C.
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Baumjohann, W.
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Beck, T.
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Bekkelien, A.
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•
Billot, N.
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Bonfils, X.
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Brandeker, A.
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Broeg, C.
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Bárczy, T.
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Berta-Thompson, Z.K.
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Cabrera, J.
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Corral Van Damme, C.
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Csizmadia, S.
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Davies, M.B.
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Deleuil, M.
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Demangeon, O.
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Demory, B.-O.
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Doty, J.P.
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Erikson, A.
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Fausnaugh, M.M.
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Florén, H.-G.
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Fortier, A.
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Fossati, L.
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Fridlund, M.
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Futyan, D.
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Gandolfi, D.
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Gillon, M.
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Guterman, P.
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Güdel, M.
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Heng, K.
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Isaak, K.G.
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Jäckel, A.
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Jenkins, J.M.
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Kiss, L.L.
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Laskar, J.
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Latham, D.W.
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Lecavelier Des Etangs, A.
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Levine, A.M.
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Lovis, C.
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Maxted, P.F.L.
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Morgan, E.H.
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Osborn, H.P.
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Ottensamer, R.
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Pallé, E.
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Peter, G.
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Piotto, G.
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Pollacco, D.
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Rando, N.
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Rauer, H.
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Ribas, I.
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Ricker, G.R.
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Salmon, S.
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Santos, N.C.
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Simon, A.E.
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Smith, A.M.S.
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Steinberger, M.
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Steller, M.
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Szabó, G.M.
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Ségransan, D.
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Shporer, A.
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Thomas, N.
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Tschentscher, M.
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Udry, S.
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Vanderspek, R.
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Van Grootel, V.
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Walton, N.A.
DOI
Abstract
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.
Volume
671
Start page
A154
Uri
Url
Issn Identifier
0004-6361
Rights
open.access
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