KEPLER-63b: A GIANT PLANET IN A POLAR ORBIT AROUND A YOUNG SUN-LIKE STAR

被引：101

作者：

Sanchis-Ojeda, Roberto ^{[1
,2
]}

Winn, Joshua N. ^{[1
,2
]}

Marcy, Geoffrey W. ^{[3
]}

Howard, Andrew W. ^{[4
]}

Isaacson, Howard ^{[3
]}

Johnson, John Asher ^{[5
]}

Torres, Guillermo ^{[6
]}

Albrecht, Simon ^{[1
,2
]}

Campante, Tiago L. ^{[7
]}

Chaplin, William J. ^{[7
]}

Davies, Guy R. ^{[7
]}

Lund, Mikkel N. ^{[8
]}

Carter, Joshua A. ^{[6
]}

Dawson, Rebekah I. ^{[6
]}

Buchhave, Lars A. ^{[9
,10
]}

Everett, Mark E. ^{[11
]}

Fischer, Debra A. ^{[12
]}

Geary, John C. ^{[6
]}

Gilliland, Ronald L. ^{[13
]}

Horch, Elliott P. ^{[14
]}

Howell, Steve B. ^{[15
]}

Latham, David W. ^{[6
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[5] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[7] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[8] Aarhus Univ, Stellar Astrophys Ctr SAC, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[9] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[10] Univ Copenhagen, Nat Hist Museum Denmark, Ctr Star & Planet Format, DK-1350 Copenhagen, Denmark

[11] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[12] Yale Univ, Dept Astron, New Haven, CT 06511 USA

[13] Penn State Univ, Davey Lab 525, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

[14] So Connecticut State Univ, New Haven, CT 06515 USA

[15] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 775卷 / 01期

基金：

新加坡国家研究基金会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

planetary systems; stars: activity; stars: individual (Kepler-63); stars: rotation; starspots; TRANSITING PLANET; LIGHT-CURVE; INITIAL CHARACTERISTICS; STELLAR ROTATION; RADIAL-VELOCITY; HOT JUPITERS; SPIN; ALIGNMENT; STARSPOTS; EXOPLANETS;

D O I：

10.1088/0004-637X/775/1/54

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery and characterization of a giant planet orbiting the young Sun-like star Kepler-63 (KOI-63, m(Kp) = 11.6, T-eff = 5576 K, M-star = 0.98 M-circle dot). The planet transits every 9.43 days, with apparent depth variations and brightening anomalies caused by large starspots. The planet's radius is 6.1 +/- 0.2 R-circle plus, based on the transit light curve and the estimated stellar parameters. The planet's mass could not be measured with the existing radial-velocity data, due to the high level of stellar activity, but if we assume a circular orbit, then we can place a rough upper bound of 120M(circle plus) (3 sigma). The host star has a high obliquity (Psi= 104 degrees), based on the Rossiter-McLaughlin effect and an analysis of starspot-crossing events. This result is valuable because almost all previous obliquity measurements are for stars with more massive planets and shorter-period orbits. In addition, the polar orbit of the planet combined with an analysis of spot-crossing events reveals a large and persistent polar starspot. Such spots have previously been inferred using Doppler tomography, and predicted in simulations of magnetic activity of young Sun-like stars.

引用

页数：13

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