[en] In the last decade, a dozen close-in giant planets have been discovered orbiting stars with spectral types ranging from M0 to M4, a mystery since known formation pathways do not predict the existence of such systems. Here, we confirm TOI-4860 b, a Jupiter-sized planet orbiting an M4.5 host, a star at the transition between fully and partially convective interiors. First identified with TESS data, we validate the transiting companion's planetary nature through multicolour photometry from the TRAPPIST-South/North, SPECULOOS, and MuSCAT3 facilities. Our analysis yields a radius of 0.76 +/- 0.02 R_Jup for the planet, a mass of 0.34 M_\odot for the star, and an orbital period of 1.52 d. Using the newly commissioned SPIRIT InGaAs camera at the SPECULOOS-South Observatory, we collect infrared photometry in zYJ that spans the time of secondary eclipse. These observations do not detect a secondary eclipse, placing an upper limit on the brightness of the companion. The planetary nature of the companion is further confirmed through high-resolution spectroscopy obtained with the IRD spectrograph at Subaru Telescope, from which we measure a mass of 0.67 +/- 0.14 M_Jup. Based on its overall density, TOI-4860 b appears to be rich in heavy elements, like its host star.
Disciplines :
Aérospatiale, astronomie & astrophysique
Auteur, co-auteur :
Triaud, Amaury H. M. J.; University of Birmingham, School of Physics and Astronomy
Dransfield, Georgina; University of Birmingham, School of Physics and Astronomy
Narita, Norio; University of Tokyo, Japan, Center for Astrobiology, Madrid, Astrophysical Institute of the Canaries
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Hirano, Teruyuki; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Rackham, Benjamin V.; MIT, Department of Earth and Planetary Science, MIT, Center for Space Research/Kavli Institute
Mori, Mayuko; University of Tokyo, Japan
Baycroft, Thomas; University of Birmingham, School of Physics and Astronomy
Benkhaldoun, Zouhair; University Cadi Ayyad, Morocco
Burgasser, Adam J.; Department of Astronomy and Astrophysics, UC San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
Caldwell, Douglas A.; NASA Ames Research Center, SETI Institute, California
Collins, Karen A.; Harvard Smithsonian Center for Astrophysics
Davis, Yasmin T.; University of Birmingham, School of Physics and Astronomy
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Demory, Brice-Oliver; University of Bern, Switzerland
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization ; CEA Saclay, Service d'Astrophysique
Fukui, Akihiko; University of Tokyo, Japan, Astrophysical Institute of the Canaries
Muñoz, Clàudia Jano; University of Cambridge, Institute of Astronomy
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Garcia, Lionel ; Université de Liège - ULiège > Astrobiology
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Chew, Yilen Gómez Maqueo; UNAM, Institute of Astronomy
Hooton, Matthew J.; University of Cambridge, Institute of Astronomy
Ikoma, Masahiro; National Astronomical Observatory of Japan
Kawauchi, Kiyoe; Ritsumeikan University, Japan
Kotani, Takayuki; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan, Graduate University for Advanced Studies, Department of Astronomical Science
Levine, Alan M.; MIT, Center for Space Research/Kavli Institute
Pallé, Enric; Astrophysical Institute of the Canaries
Pedersen, Peter P.; Department of Physics, ETH Zurich, Wolfgang-Pauli-Strasse 2, CH-8093 Zurich, Switzerland
Pozuelos, Francisco J.; University of Liege, Belgium, Institute of Astrophysics of Andalusia
Queloz, Didier; University of Cambridge, Institute of Astronomy, -
Scutt, Owen J.; University of Birmingham, School of Physics and Astronomy
Seager, Sara; MIT, Department of Earth and Planetary Science
Sebastian, Daniel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization ; University of Birmingham, School of Physics and Astronomy
Tamura, Motohide; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan, University of Tokyo, Department of Astronomy
Thompson, Samantha; University of Cambridge, Institute of Astronomy
Watanabe, Noriharu; University of Tokyo, Japan
de Wit, Julien; MIT, Department of Earth and Planetary Science
Winn, Joshua N.; Princeton University, Department of Astrophysical Sciences
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