Article (Scientific journals)
An M dwarf accompanied by a close-in giant orbiter with SPECULOOS
Triaud, Amaury H. M. J.; Dransfield, Georgina; Kagetani, Taiki et al.
2023In Monthly Notices of the Royal Astronomical Society, 525, p. 98-L104
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Keywords :
techniques: photometric; techniques: radial velocities; exoplanets; infrared: planetary systems; Astrophysics - Earth and Planetary
Abstract :
[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 :
Space science, astronomy & astrophysics
Author, co-author :
Triaud, Amaury H. M. J.;  University of Birmingham, School of Physics and Astronomy
Dransfield, Georgina;  University of Birmingham, School of Physics and Astronomy
Kagetani, Taiki;  University of Tokyo, Japan
Timmermans, Mathilde  ;  Université de Liège - ULiège > Astrobiology
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
Ghachoui, Mourad ;  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
Zúñiga Fernández, Sebastián Gaspar  ;  Université de Liège - ULiège > Astrobiology
More authors (33 more) Less
Language :
English
Title :
An M dwarf accompanied by a close-in giant orbiter with SPECULOOS
Publication date :
01 October 2023
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, Gb
Volume :
525
Pages :
L98-L104
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 September 2023

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