techniques: radial velocities; stars: late-type; planetary systems
Abstract :
[en] We report on the detection of GJ 3634b, a super-Earth of mass m sin i = 7.0[SUB]-0.8[SUP]+0.9[/SUP]~M_⊕[/SUB] and period P = 2.64561 ± 0.00066 day. Its host star is a M2.5 dwarf, has a mass of 0.45 ± 0.05 M[SUB]ȯ[/SUB], a radius of 0.43 ± 0.03 R[SUB]ȯ[/SUB] and lies 19.8 ± 0.6 pc away from our Sun. The planet is detected after a radial-velocity campaign using the ESO/Harps spectrograph. GJ 3634b had an a priori geometric probability to undergo transit of ~7% and, if telluric in composition, a non-grazing transit would produce a photometric dip of ≲0.1%. We therefore followed-up upon the RV detection with photometric observations using the 4.5-μm band of the IRAC imager onboard Spitzer. Our six-hour long light curve excludes that a transit occurs for 2σ of the probable transit window, decreasing the probability that GJ 3634b undergoes transit to ~0.5%. Based on observations made with the Harps instrument on the ESO 3.6-m telescope at La Silla Observatory under program IDs 082.C-0718(B) and183.C-0437(A), and observations made with Warm Spitzer under program 60027.Radial-velocity and photometric tables (Tables 2 and 3) are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/528/A111">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/528/A111</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bonfils, X.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France ; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290, Sauverny, Switzerland
Gillon, Michaël ; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290, Sauverny, Switzerland ; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Bât. B5C, 4000, Liège, Belgium
Forveille, T.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France
Delfosse, X.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France
Deming, D.; Planetary Systems Branch, Code 693, NASA/Goddard Space Flight Center Greenbelt, MD, 20771, USA
Demory, B*-O; Department of Earth, Atmospheric and Planetary Sciences, Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
Lovis, C.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290, Sauverny, Switzerland
Mayor, M.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290, Sauverny, Switzerland
Neves, V.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France ; Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal
Perrier, C.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France
Santos, N. C.; Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal
Seager, S.; Department of Earth, Atmospheric and Planetary Sciences, Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
Udry, S.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290, Sauverny, Switzerland
Boisse, I.; Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal
Bonnefoy, M.; UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France
