Article (Scientific journals)
A rocky planet transiting a nearby low-mass star
Berta-Thompson, Zachory K.; Irwin, Jonathan; Charbonneau, David et al.
2015In Nature, 527, p. 204-207
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Abstract :
[en] M-dwarf stars—hydrogen-burning stars that are smaller than 60 per cent of the size of the Sun—are the most common class of star in our Galaxy and outnumber Sun-like stars by a ratio of 12:1. Recent results have shown that M dwarfs host Earth-sized planets in great numbers: the average number of M-dwarf planets that are between 0.5 to 1.5 times the size of Earth is at least 1.4 per star. The nearest such planets known to transit their star are 39 parsecs away, too distant for detailed follow-up observations to measure the planetary masses or to study their atmospheres. Here we report observations of GJ 1132b, a planet with a size of 1.2 Earth radii that is transiting a small star 12 parsecs away. Our Doppler mass measurement of GJ 1132b yields a density consistent with an Earth-like bulk composition, similar to the compositions of the six known exoplanets with masses less than six times that of the Earth and precisely measured densities. Receiving 19 times more stellar radiation than the Earth, the planet is too hot to be habitable but is cool enough to support a substantial atmosphere, one that has probably been considerably depleted of hydrogen. Because the host star is nearby and only 21 per cent the radius of the Sun, existing and upcoming telescopes will be able to observe the composition and dynamics of the planetary atmosphere.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Berta-Thompson, Zachory K.;  Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA ; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Irwin, Jonathan;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Charbonneau, David;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Newton, Elisabeth R.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Dittmann, Jason A.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Astudillo-Defru, Nicola;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Bonfils, Xavier;  Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France
Gillon, Michaël  ;  Université de Liège - ULiège
Jehin, Emmanuel  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Stark, Antony A.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Stalder, Brian;  Institute for Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
Bouchy, Francois;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland ; Laboratoire d’Astrophysique de Marseille, UMR 6110 CNRS, Université de Provence, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Delfosse, Xavier;  Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France
Forveille, Thierry;  Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France
Lovis, Christophe;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Mayor, Michel;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Neves, Vasco;  Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, Rio Grande do Norte, Brazil
Pepe, Francesco;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Santos, Nuno C.;  Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, Portugal
Udry, Stéphane;  Observatoire de Genève, Université de Genéve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Wünsche, Anaël;  Université Grenoble Alpes, IPAG, F-38000 Grenoble, France ; CNRS, IPAG, F-38000 Grenoble, France)
More authors (11 more) Less
Language :
English
Title :
A rocky planet transiting a nearby low-mass star
Publication date :
01 November 2015
Journal title :
Nature
ISSN :
0028-0836
eISSN :
1476-4687
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
527
Pages :
204-207
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 December 2015

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