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Title:
SOPHIE velocimetry of Kepler transit candidates. XII. KOI-1257 b: a highly eccentric three-month period transiting exoplanet
Authors:
Santerne, A.; Hébrard, G.; Deleuil, M.; Havel, M.; Correia, A. C. M.; Almenara, J.-M.; Alonso, R.; Arnold, L.; Barros, S. C. C.; Behrend, R.; Bernasconi, L.; Boisse, I.; Bonomo, A. S.; Bouchy, F.; Bruno, G.; Damiani, C.; Díaz, R. F.; Gravallon, D.; Guillot, T.; Labrevoir, O.; Montagnier, G.; Moutou, C.; Rinner, C.; Santos, N. C.; Abe, L.; Audejean, M.; Bendjoya, P.; Gillier, C.; Gregorio, J.; Martinez, P.; Michelet, J.; Montaigut, R.; Poncy, R.; Rivet, J.-P.; Rousseau, G.; Roy, R.; Suarez, O.; Vanhuysse, M.; Verilhac, D.
Affiliation:
AA(Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal ; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AB(Institut d'Astrophysique de Paris, UMR 7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014, Paris, France; Observatoire de Haute-Provence, Université d'Aix-Marseille & CNRS, 04870, Saint Michel l'Observatoire, France), AC(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AD(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France; Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal), AE(Departamento de Física, I3N, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal; Astronomie et Systèmes Dynamiques, IMCCE-CNRS UMR 8028, 77 Av. Denfert-Rochereau, 75014, Paris, France), AF(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AG(Instituto de Astrofísica de Canarias (IAC), 38200, La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. Astrofísica, 38206, La Laguna, Tenerife, Spain), AH(Observatoire de Haute-Provence, Université d'Aix-Marseille & CNRS, 04870, Saint Michel l'Observatoire, France), AI(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AJ(Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland; CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, 1290, Sauverny, Switzerland), AK(Observatoire des Engarouines, 1606 chemin de Rigoy, 84570, Mallemort-du-Comtat, France), AL(Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AM(INAF - Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy), AN(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France; Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland), AO(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AP(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AQ(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France; Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland), AR(Observatoire de Haute-Provence, Université d'Aix-Marseille & CNRS, 04870, Saint Michel l'Observatoire, France), AS(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France), AT(Centre d'Astronomie, Plateau du Moulin à Vent, 04870, St.-Michel-l'Observatoire, France), AU(Institut d'Astrophysique de Paris, UMR 7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014, Paris, France; Observatoire de Haute-Provence, Université d'Aix-Marseille & CNRS, 04870, Saint Michel l'Observatoire, France), AV(Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France; CNRS, Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Hwy., Kamuela, HI, 96743, USA), AW(Observatoire Oukaimeden, 40273, Oukaimeden, Morocco), AX(Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4169-007, Porto, Portugal), AY(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France), AZ(Observatoire de Chinon B92, Mairie de Chinon, 37500, Chinon, France), BA(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France), BB(Club d'Astronomie Lyon Ampère, Bât. Planétarium, Place de la Nation, 69120, Vaulx-en-Velin, France), BC(Atalaia Group - Crow Observatory, 4169-007, Porto, Portalegre, Portugal), BD(Observatoire ADAGIO, 31540, Bélesta, France), BE(Club d'Astronomie Lyon Ampère, Bât. Planétarium, Place de la Nation, 69120, Vaulx-en-Velin, France), BF(Club d'Astronomie Lyon Ampère, Bât. Planétarium, Place de la Nation, 69120, Vaulx-en-Velin, France), BG(2 rue des Écoles, 34920, Le Cres, France), BH(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France), BI(CdR & CdL Group: Lightcurves of Minor Planets and Variable Stars, 1290, Sauverny, Switzerland), BJ(Observatoire de Blauvac, 293 Ch. de St. Guillaume, 84570, Blauvac, France), BK(Laboratoire Lagrange, UMR 7239, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 06300, Nice, France), BL(OverSky, 47 allée des Palanques, BP 12, 33127, Saint-Jean d'Illac, France), BM(Montreurs de Grande Ourse, les Mairies, 26190, St. Laurent en Royans, France)
Publication:
Astronomy & Astrophysics, Volume 571, id.A37, 36 pp. (A&A Homepage)
Publication Date:
11/2014
Origin:
EDP Sciences
Astronomy Keywords:
planetary systems, techniques: photometric, techniques: radial, velocities, techniques: spectroscopic, methods: data, analysis, stars: individual: KOI-1257 Ab
DOI:
10.1051/0004-6361/201424158
Bibliographic Code:
2014A&A...571A..37S

Abstract

In this paper we report a new transiting warm giant planet: KOI-1257 b. It was first detected in photometry as a planet-candidate by the Kepler space telescope and then validated thanks to a radial velocity follow-up with the SOPHIE spectrograph. It orbits its host star with a period of 86.647661 d ± 3 s and a high eccentricity of 0.772 ± 0.045. The planet transits the main star of a metal-rich, relatively old binary system with stars of mass of 0.99 ± 0.05 M&sun; and 0.70 ± 0.07 M&sun; for the primary and secondary, respectively. This binary system is constrained thanks to a self-consistent modelling of the Kepler transit light curve, the SOPHIE radial velocities, line bisector and full-width half maximum (FWHM) variations, and the spectral energy distribution. However, future observations are needed to confirm it. The PASTIS fully-Bayesian software was used to validate the nature of the planet and to determine which star of the binary system is the transit host. By accounting for the dilution from the binary both in photometry and in radial velocity, we find that the planet has a mass of 1.45 ± 0.35 M&sun; , and a radius of 0.94 ± 0.12 R&sun; , and thus a bulk density of 2.1 ± 1.2 g cm-3. The planet has an equilibrium temperature of 511 ± 50 K, making it one of the few known members of the warm-Jupiter population. The HARPS-N spectrograph was also used to observe a transit of KOI-1257 b, simultaneously with a joint amateur and professional photometric follow-up, with the aim of constraining the orbital obliquity of the planet. However, the Rossiter-McLaughlin effect was not clearly detected, resulting in poor constraints on the orbital obliquity of the planet.

Based on observations made with SOPHIE on the 1.93 m telescope at Observatoire de Haute-Provence (CNRS), France, and with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Part of the observations were made with the IAC80 operated on the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias.Appendices are available in electronic form at http://www.aanda.orgFull Tables C.5-C.7 are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/571/A37

Associated Articles

Part  1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10     Part 11     Part 12     Part 13     Catalog Description     Part 14    

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