Transiting exoplanets from the CoRoT space mission XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit

被引：12

作者：

Cabrera, J. ^{[1
]}

Csizmadia, Sz. ^{[1
]}

Montagnier, G. ^{[2
]}

Fridlund, M. ^{[3
,4
,5
]}

Ammler-von Eiff, M. ^{[6
]}

Chaintreuil, S. ^{[7
]}

Damiani, C. ^{[8
]}

Deleuil, M. ^{[8
]}

Ferraz-Mello, S. ^{[9
]}

Ferrigno, A. ^{[7
]}

Gandolfi, D. ^{[10
]}

Guillot, T. ^{[11
]}

Guenther, E. W. ^{[6
,12
]}

Hatzes, A. ^{[6
]}

Hebrard, G. ^{[2
]}

Klagyivik, P. ^{[13
,14
]}

Parviainen, H. ^{[15
]}

Pasternacki, Th. ^{[1
]}

Paetzold, M. ^{[16
]}

Sebastian, D. ^{[6
]}

Tadeu dos Santos, M. ^{[9
]}

Wuchterl, G. ^{[6
]}

Aigrain, S. ^{[15
]}

Alonso, R. ^{[13
,14
]}

Almenara, J. -M. ^{[8
]}

Armstrong, J. D. ^{[17
,18
]}

Auvergne, M. ^{[7
]}

Baglin, A. ^{[7
]}

Barge, P. ^{[8
]}

Barros, S. C. C. ^{[8
]}

Bonomo, A. S. ^{[19
]}

Borde, P. ^{[20
,21
]}

Bouchy, F. ^{[8
]}

Carpano, S. ^{[24
]}

Chaffey, C. ^{[25
]}

Deeg, H. J. ^{[13
,14
]}

Diaz, R. F. ^{[26
]}

Dvorak, R. ^{[27
]}

Erikson, A. ^{[1
]}

Grziwa, S. ^{[16
]}

Korth, J. ^{[16
]}

Lammer, H. ^{[12
]}

Lindsay, C. ^{[28
]}

Mazeh, T. ^{[29
]}

Moutou, C. ^{[8
,30
]}

Ofir, A. ^{[31
]}

Ollivier, M. ^{[22
,23
]}

Palle, E. ^{[13
,14
]}

Rauer, H. ^{[1
,32
]}

Rouan, D. ^{[7
]}

机构：

[1] German Aerosp Ctr, Inst Planetary Res, D-12489 Berlin, Germany

[2] Univ Paris 06, UMR CNRS 7095, Inst Astrophys Paris, F-75014 Paris, France

[3] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[4] Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden

[5] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[6] Thuringer Landessternwarte, D-07778 Tautenburg, Germany

[7] Univ Paris Diderot, UPMC, Observ Paris, LESIA,UMR CNRS 8109, F-92195 Meudon, France

[8] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

[9] Univ Sao Paulo, IAG, BR-05508090 Sao Paulo, Brazil

[10] Fak Phys & Astron, Zentrum Astron, D-69120 Heidelberg, Germany

[11] Univ Nice Sophia Antipolis, CNRS UMR 6202, Observ Cote Azur, F-06304 Nice 4, France

[12] Austrian Acad Sci, Inst Weltraumforsch, IWF, A-8042 Graz, Austria

[13] Inst Astrofis Canarias, Tenerife 38205, Spain

[14] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[15] Univ Oxford, Dept Phys, Subdept Astrophys, Oxford OX1 3RH, England

[16] Univ Cologne, Rhein Inst Umweltforsch, D-50931 Cologne, Germany

[17] Univ Hawaii, Inst Astron, Pukalani, HI 96768 USA

[18] Las Cumbres Observ Global Telescope Network Inc, Goleta, CA 93117 USA

[19] INAF Osservatorio Astrofis Torino, I-10025 Pino Torinese, Italy

[20] Univ Bordeaux, UMR 5804, LAB, F-33270 Floirac, France

[21] CNRS, F-33270 Floirac, France

[22] Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France

[23] CNRS, F-91405 Orsay, France

[24] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[25] Torrance High Sch, Torrance, CA 90501 USA

[26] Observ Univ Geneve, CH-1290 Sauverny, Switzerland

[27] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

[28] Iolani Sch, Honolulu, HI 96816 USA

[29] Tel Aviv Univ, Sch Phys & Astron, Raymond & Beverly Sackler Fac Exact Sci, IL-6997801 Tel Aviv, Israel

[30] CFHT Corp, Kamuela, HI 96743 USA

[31] Inst Astrophys, D-37077 Gottingen, Germany

[32] Tech Univ Berlin, Ctr Astron & Astrophys, D-10623 Berlin, Germany

[33] Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, P-4150762 Oporto, Portugal

[34] Univ Paris Diderot, UMR CNRS 8102, Observ Paris, LUTH, F-92195 Meudon, France

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 579卷

基金：

美国国家航空航天局; 欧洲研究理事会; 美国国家科学基金会;

关键词：

planetary systems; techniques: photometric; techniques: radial velocities; techniques: spectroscopic; RAPIDLY ROTATING STARS; SOLAR-TYPE STARS; LIGHT CURVES; LITHIUM ABUNDANCES; DWARF COMPANION; BINARY-SYSTEMS; HOT JUPITERS; PHASE CURVES; V410; TAURI; KEPLER;

D O I：

10.1051/0004-6361/201424501

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT. Aims. We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars. Methods. We used the transit light curve to characterize the planetary parameters relative to the stellar parameters. The analysis of HARPS spectra established the planetary nature of the detections, providing their masses. Further photometric and spectroscopic ground-based observations provided stellar parameters (log g, T-eff, v sin i) to characterize the host stars. Our model takes the geometry of the transit to constrain the stellar density into account, which when linked to stellar evolutionary models, determines the bulk parameters of the star. Because of the asymmetric shape of the light curve of one of the planets, we had to include the possibility in our model that the stellar surface was not strictly spherical. Results. We present the planetary parameters of CoRoT-28b, a Jupiter-sized planet (mass 0.484 +/- 0.087 M-Jup; radius 0.955 +/- 0.066 R-Jup) orbiting an evolved star with an orbital period of 5.208 51 +/- 0.000 38 days, and CoRoT-29b, another Jupiter-sized planet (mass 0.85 +/- 0.20 M-Jup; radius 0.90 +/- 0.16 R-Jup) orbiting an oblate star with an orbital period of 2.850 570 +/- 0.000 006 days. The reason behind the asymmetry of the transit shape is not understood at this point. Conclusions. These two new planetary systems have very interesting properties and deserve further study, particularly in the case of the star CoRoT-29.

引用

页数：19

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