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 v<SUP>2</SUP> Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M<SUB>⊕</SUB>). 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<SUB>⊕</SUB> exoplanet v<SUP>2</SUP> 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<SUB>−0.0022</SUB><SUP>+0.0019</SUP> days and T<SUB>c</SUB> = 2459009.7759<SUB>−0.0096</SUB><SUP>+0.0101</SUP> BJD<SUB>TDB</SUB>, 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 v<SUP>2</SUP> Lup d transits will warrant a comprehensive search for a moon around this outstanding exoplanet. <P />Undetrended and detrended light curves are only available at the CDS via anonymous ftp to <A href="https://cdsarc.cds.unistra.fr/">cdsarc.cds.unistra.fr</A> (ftp://130.79.128.5) or via <A href="https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/671/A154">https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/671/A154</A>
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
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
Charnoz, S.; Institut de Physique du Globe de Paris
Collier Cameron, A.; University of Liege, Laboratory of Planetary and Atmospheric Physics
Deline, A.; University of Geneva, Astronomical Observatory
Hooton, M.; University of Cambridge, Institute of Astronomy, University of Bern, Physics Institute
Lendl, M.; University of Geneva, Astronomical Observatory
Olofsson, G.; AlbaNova University Center
Sousa, S. G.; University of Porto, Center for Astrophysics
Adibekyan, V.; University of Porto, Center for Astrophysics
Alonso, R.; Astrophysical Institute of the Canaries
Anglada, G.; Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193, Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), Carrer del Gran Capità, 2, 08034, Barcelona, Spain
Barrado, D.; Depto. de Astrofísica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 28692, Villanueva de la Cañada (Madrid), Spain
Barros, S. C. C.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Baumjohann, W.; Austrian Institute of Space Science Research
Beck, T.; University of Bern, Physics Institute
Bekkelien, A.; University of Geneva, Astronomical Observatory
Bergomi, M.; Astronomical Observatory of Padua
Billot, N.; University of Geneva, Astronomical Observatory
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Brandeker, A.; AlbaNova University Center
Broeg, C.; University of Bern, Physics Institute
Bárczy, T.; Admatis, 5. Kandó Kálmán Street, 3534, Miskolc, Hungary
Berta-Thompson, Z. K.; University of Colorado, Boulder, Department of Astrophysical and Planetary Sciences
Cabrera, J.; Helmholtz Institute for Planetary Research, Berlin
Corral Van Damme, C.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201, Noordwijk, The Netherlands
Csizmadia, S.; Helmholtz Institute for Planetary Research, Berlin
Davies, M. B.; University of Lund, Sweden
Deleuil, M.; Aix-Marseille Universite, Laboratoire d'Astrophysique
Demangeon, O.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Demory, B. -O.; University of Bern, Switzerland
Doty, J. P.; Noqsi Aerospace Ltd., 15 Blanchard Avenue, Billerica, MA 01821, USA
Erikson, A.; Helmholtz Institute for Planetary Research, Berlin
Fausnaugh, M. M.; MIT, Center for Space Research/Kavli Institute
Florén, H. -G.; AlbaNova University Center
Fortier, A.; University of Bern, Physics Institute
Fossati, L.; Austrian Institute of Space Science Research
Fridlund, M.; Leiden Observatory, Onsala Space Observatory
Futyan, D.; University of Geneva, Astronomical Observatory
Gandolfi, D.; University of Turin, Department of Physics
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Güdel, M.; University of Vienna, Department of Astronomy
Heng, K.; University of Bern, Switzerland, University of Warwick, Department of Physics
Isaak, K. G.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201, Noordwijk, The Netherlands
Jäckel, A.; University of Bern, Switzerland
Jenkins, J. M.; NASA Ames Research Center
Kiss, L. L.; Konkoly Observatory, Eotvos Lorand University, Hungary
Laskar, J.; Observatoire de Paris, Institut de Mecanique Celeste et de Calcul des Ephemerides
Latham, D. W.; Harvard Smithsonian Center for Astrophysics
Lecavelier des Etangs, A.; Institut d'astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98bis blvd. Arago, 75014, Paris, France
Levine, A. M.; MIT, Center for Space Research/Kavli Institute
Lovis, C.; University of Geneva, Astronomical Observatory
Magrin, D.; Astronomical Observatory of Padua
Maxted, P. F. L.; Keele University, Department of Physics and Astrophysics
Morgan, E. H.; MIT, Center for Space Research/Kavli Institute
Nascimbeni, V.; Astronomical Observatory of Padua
Osborn, H. P.; University of Bern, Physics Institute, MIT, Center for Space Research/Kavli Institute
Ottensamer, R.; University of Vienna, Department of Astronomy
Pagano, I.; Astronomical Observatory of Catania
Pallé, E.; Astrophysical Institute of the Canaries
Peter, G.; German Aerospace Center, Berlin
Piotto, G.; Astronomical Observatory of Padua, University of Padua, Department of Physics and Astronomy
Pollacco, D.; University of Warwick, Department of Physics
Ragazzoni, R.; Astronomical Observatory of Padua, University of Padua, Department of Physics and Astronomy
Rando, N.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201, Noordwijk, The Netherlands
Rauer, H.; Helmholtz Institute for Planetary Research, Berlin, Technical University of Berlin, Center for Astronomy and Astrophysics, Free University of Berlin, Department of Geosciences
Ribas, I.; Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193, Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), Carrer del Gran Capità, 2, 08034, Barcelona, Spain
Ricker, G. R.; MIT, Center for Space Research/Kavli Institute
Salmon, S.; University of Geneva, Astronomical Observatory
Santos, N. C.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Scandariato, G.; Astronomical Observatory of Catania
Simon, A. E.; University of Bern, Physics Institute
Smith, A. M. S.; Helmholtz Institute for Planetary Research, Berlin
Steinberger, M.; Austrian Institute of Space Science Research
Steller, M.; Austrian Institute of Space Science Research
Szabó, G. M.; Eotvos Lorand University, Hungary, Eotvos Lorand University, Hungary
Ségransan, D.; University of Geneva, Astronomical Observatory
Shporer, A.; MIT, Center for Space Research/Kavli Institute
Thomas, N.; University of Bern, Physics Institute
Tschentscher, M.; Helmholtz Institute for Planetary Research, Berlin
Udry, S.; University of Geneva, Astronomical Observatory
Vanderspek, R.; MIT, Center for Space Research/Kavli Institute
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Walton, N. A.; University of Cambridge, Institute of Astronomy
