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Title:
Transiting exoplanets from the CoRoT space mission. XXIV. CoRoT-25b and CoRoT-26b: two low-density giant planets
Authors:
Almenara, J. M.; Bouchy, F.; Gaulme, P.; Deleuil, M.; Havel, M.; Gandolfi, D.; Deeg, H. J.; Wuchterl, G.; Guillot, T.; Gardes, B.; Pasternacki, T.; Aigrain, S.; Alonso, R.; Auvergne, M.; Baglin, A.; Bonomo, A. S.; Bordé, P.; Cabrera, J.; Carpano, S.; Cochran, W. D.; Csizmadia, Sz.; Damiani, C.; Diaz, R. F.; Dvorak, R.; Endl, M.; Erikson, A.; Ferraz-Mello, S.; Fridlund, M.; Hébrard, G.; Gillon, M.; Guenther, E.; Hatzes, A.; Léger, A.; Lammer, H.; MacQueen, P. J.; Mazeh, T.; Moutou, C.; Ollivier, M.; Ofir, A.; Pätzold, M.; Parviainen, H.; Queloz, D.; Rauer, H.; Rouan, D.; Santerne, A.; Samuel, B.; Schneider, J.; Tal-Or, L.; Tingley, B.; Weingrill, J.
Affiliation:
AA(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France ), AB(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France; Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014, Paris, France), AC(Department of Astronomy, New Mexico State University, PO Box 30001, MSC 4500, Las Cruces, NM, 88003-8001, USA), AD(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AE(NASA Postdoctoral Program Fellow, Ames Research Center, PO Box 1, Moffett Field, CA, 94035, USA), AF(Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG, Noordwijk, The Netherlands), AG(Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife, Spain), AH(Thüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778, Tautenburg, Germany), AI(Observatoire de la Côte d'Azur, Laboratoire Cassiopée, BP 4229, 06304, Nice Cedex 4, France), AJ(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AK(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany), AL(Department of Physics, Denys Wilkinson Building Keble Road, Oxford, OX1 3RH, UK), AM(Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife, Spain; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland), AN(LESIA, Obs de Paris, Place J. Janssen, 92195, Meudon Cedex, France), AO(LESIA, Obs de Paris, Place J. Janssen, 92195, Meudon Cedex, France), AP(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France; INAF - Osservatorio Astronomico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy), AQ(Institut d'astrophysique spatiale, Université Paris-Sud 11 & CNRS, UMR 8617, Bât. 121, 91405, Orsay, France), AR(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany), AS(Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG, Noordwijk, The Netherlands), AT(McDonald Observatory, The University of Texas at Austin, Austin, TX, 78712, USA), AU(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany), AV(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AW(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), AX(University of Vienna, Institute of Astronomy, Türkenschanzstr. 17, 1180, Vienna, Austria), AY(McDonald Observatory, The University of Texas at Austin, Austin, TX, 78712, USA), AZ(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany), BA(IAG, Universidade de Sao Paulo, Brazil), BB(Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG, Noordwijk, The Netherlands), BC(Observatoire de Haute Provence, 04670 Saint Michel l', Observatoire, France; Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014, Paris, France), BD(University of Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium), BE(Thüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778, Tautenburg, Germany), BF(Thüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778, Tautenburg, Germany), BG(Institut d'astrophysique spatiale, Université Paris-Sud 11 & CNRS, UMR 8617, Bât. 121, 91405, Orsay, France), BH(Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042, Graz, Austria), BI(McDonald Observatory, The University of Texas at Austin, Austin, TX, 78712, USA), BJ(Wise Observatory, Tel Aviv University, 69978, Tel Aviv, Israel), BK(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), BL(Institut d'astrophysique spatiale, Université Paris-Sud 11 & CNRS, UMR 8617, Bât. 121, 91405, Orsay, France), BM(Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany), BN(Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany), BO(Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife, Spain), BP(Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland), BQ(Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany; Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623, Berlin, Germany), BR(LESIA, Obs de Paris, Place J. Janssen, 92195, Meudon Cedex, France), BS(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France), BT(LESIA, Obs de Paris, Place J. Janssen, 92195, Meudon Cedex, France), BU(LUTH, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92195, Meudon, France), BV(Wise Observatory, Tel Aviv University, 69978, Tel Aviv, Israel), BW(Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife, Spain; Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark), BX(Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042, Graz, Austria)
Publication:
Astronomy & Astrophysics, Volume 555, id.A118, 11 pp. (A&A Homepage)
Publication Date:
07/2013
Origin:
EDP Sciences
Astronomy Keywords:
planetary systems, techniques: photometric, techniques: radial velocities, techniques: spectroscopic
DOI:
10.1051/0004-6361/201321462
Bibliographic Code:
2013A&A...555A.118A

Abstract

We report the discovery of two transiting exoplanets, CoRoT-25b and CoRoT-26b, both of low density, one of which is in the Saturn mass-regime. For each star, ground-based complementary observations through optical photometry and radial velocity measurements secured the planetary nature of the transiting body and allowed us to fully characterize them. For CoRoT-25b we found a planetary mass of 0.27 ± 0.04 MJup, a radius of 1.08-0.10+0.3 RJup and hence a mean density of 0.15-0.06+0.15 g cm-3. The planet orbits an F9 main-sequence star in a 4.86-day period, that has a V magnitude of 15.0, solar metallicity, and an age of 4.5-2.0+1.8-Gyr. CoRoT-26b orbits a slightly evolved G5 star of 9.06 ± 1.5-Gyr age in a 4.20-day period that hassolar metallicity and a V magnitude of 15.8. With a mass of 0.52 ± 0.05 MJup, a radius of 1.26-0.07+0.13 RJup, and a mean density of 0.28-0.07+0.09 g cm-3, it belongs to the low-mass hot-Jupiter population. Planetary evolution models allowed us to estimate a core mass of a few tens of Earth mass for the two planets with heavy-element mass fractions of 0.52-0.15+0.08 and 0.26-0.08+0.05, respectively, assuming that a small fraction of the incoming flux is dissipated at the center of the planet. In addition, these models indicate that CoRoT-26b is anomalously large compared with what standard models could account for, indicating that dissipation from stellar heating could cause this size.

The CoRoT space mission, launched on December 27th 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD and Science Programme), Germany and Spain. Partly based on observations obtained at the European Southern Observatory at Paranal and La Silla, Chile in programs 083.C-0690(A), 184.C-0639.

Associated Articles

Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10     Part 11     Part 12     Part 13     Part 14     Part 15     Part 16     Part 17     Part 18     Part 19     Part 20     Part 22     Part 21     Part 23     Part 24     Part 25     Part 26     Part  1    

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