Transiting exoplanets from the CoRoT space mission : XXIV. CoRoT-25b and CoRoT-26b: Two low-density giant planets

被引：0

作者：

Almenara, J.M. ^{[1
]}

Bouchy, F. ^{[1
,2
]}

Gaulme, P. ^{[3
]}

Deleuil, M. ^{[1
]}

Havel, M. ^{[4
]}

Gandolfi, D. ^{[5
]}

Deeg, H.J. ^{[6
,7
]}

Wuchterl, G. ^{[8
]}

Guillot, T. ^{[9
]}

Gardes, B. ^{[1
]}

Pasternacki, T. ^{[10
]}

Aigrain, S. ^{[11
]}

Alonso, R. ^{[6
,7
,12
]}

Auvergne, M. ^{[13
]}

Baglin, A. ^{[13
]}

Bonomo, A.S. ^{[1
,14
]}

Bordé, P. ^{[15
]}

Cabrera, J. ^{[10
]}

Carpano, S. ^{[5
]}

Cochran, W.D. ^{[16
]}

Csizmadia, Sz. ^{[10
]}

Damiani, C. ^{[1
]}

Diaz, R.F. ^{[1
]}

Dvorak, R. ^{[17
]}

Endl, M. ^{[16
]}

Erikson, A. ^{[10
]}

Ferraz-Mello, S. ^{[18
]}

Fridlund, M. ^{[5
]}

Hébrard, G. ^{[2
,19
]}

Gillon, M. ^{[20
]}

Guenther, E. ^{[8
]}

Hatzes, A. ^{[8
]}

Léger, A. ^{[15
]}

Lammer, H. ^{[21
]}

MacQueen, P.J. ^{[16
]}

Mazeh, T. ^{[22
]}

Moutou, C. ^{[1
]}

Ollivier, M. ^{[15
]}

Ofir, A. ^{[23
]}

Pätzold, M. ^{[24
]}

Parviainen, H. ^{[6
,7
]}

Queloz, D. ^{[12
]}

Rauer, H. ^{[10
,25
]}

Rouan, D. ^{[13
]}

Santerne, A. ^{[1
]}

Samuel, B. ^{[13
]}

Schneider, J. ^{[26
]}

Tal-Or, L. ^{[22
]}

Tingley, B. ^{[6
,7
,27
]}

Weingrill, J. ^{[21
]}

机构：

[1] Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326

[2] Institut d'Astrophysique de Paris, 75014 Paris

[3] Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001

[4] NASA Postdoctoral Program Fellow, Ames Research Center, Moffett Field, CA 94035

[5] Research and Scientific Support Department, ESTEC/ESA, 2200 AG Noordwijk

[6] Instituto de Astrofisica de Canarias, 38205 La Laguna, Tenerife

[7] Universidad de la Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife

[8] Thüringer Landessternwarte, Tautenburg 5, 07778 Tautenburg

[9] Observatoire de la Côte d'Azur, Laboratoire Cassiopée, 06304 Nice Cedex 4

[10] Institute of Planetary Research, German Aerospace Center, 12489 Berlin

[11] Department of Physics, Denys Wilkinson Building, Oxford, OX1 3RH, Keble Road

[12] Observatoire de l'Université de Genève, 1290 Sauverny

[13] LESIA, Obs de Paris, 92195 Meudon cedex, Place J. Janssen

[14] INAF-Osservatorio Astronomico di Torino, 10025 Pino Torinese

[15] Institut d'Astrophysique Spatiale, Université Paris-Sud 11 and CNRS, UMR 8617, 91405 Orsay

[16] McDonald Observatory, University of Texas at Austin, Austin

[17] University of Vienna, Institute of Astronomy, 1180 Vienna

[18] IAG, Universidade de Sao Paulo

[19] Observatoire de Haute Provence

[20] University of Liège, Sart Tilman, Liège 1

[21] Space Research Institute, Austrian Academy of Science, 8042 Graz

[22] Wise Observatory, Tel Aviv University

[23] Institut für Astrophysik, Georg-August-Universität, 37077 Göttingen

[24] Rheinisches Institut für Umweltforschung An der Universität zu Köln, 50931 Köln

[25] Center for Astronomy and Astrophysics, TU Berlin, 10623 Berlin

[26] LUTH, CNRS, Université Paris Diderot, 92195 Meudon

[27] Department of Physics and Astronomy, Aarhus University

来源：

Astronomy and Astrophysics | 2013年 / 555卷

基金：

英国科学技术设施理事会; 美国国家航空航天局;

关键词：

Planetary systems; Techniques: photometric; Techniques: radial velocities; Techniques: spectroscopic;

D O I：

10.1051/0004-6361/201321462

中图分类号：

学科分类号：

摘要：

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. © 2013 ESO.

引用

共 31 条

[31] HAT-P-18b AND HAT-P-19b: TWO LOW-DENSITY SATURN-MASS PLANETS TRANSITING METAL-RICH K STARS
Hartman, J. D.
Bakos, G. A.
Sato, B.
Torres, G.
Noyes, R. W.
Latham, D. W.
Kovacs, G.
Fischer, D. A.
Howard, A. W.
Johnson, J. A.
Marcy, G. W.
Buchhave, L. A.
Fueresz, G.
Perumpilly, G.
Beky, B.
Stefanik, R. P.
Sasselov, D. D.
Esquerdo, G. A.
Everett, M.
Csubry, Z.
Lazar, J.
Papp, I.
Sari, P.
ASTROPHYSICAL JOURNAL, 2011, 726 (01)

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