THE KEPLER-10 PLANETARY SYSTEM REVISITED BY HARPS-N: A HOT ROCKY WORLD AND A SOLID NEPTUNE-MASS PLANET

被引：142

作者：

Dumusque, Xavier ^{[1
]}

Bonomo, Aldo S. ^{[2
]}

Haywood, Raphaelle D. ^{[3
]}

Malavolta, Luca ^{[4
,5
]}

Segransan, Damien ^{[6
]}

Buchhave, Lars A. ^{[1
,7
]}

Cameron, Andrew Collier ^{[3
]}

Latham, David W. ^{[1
]}

Molinari, Emilio ^{[8
,9
]}

Pepe, Francesco ^{[6
]}

Udry, Stephane ^{[6
]}

Charbonneau, David ^{[1
]}

Cosentino, Rosario ^{[8
]}

Dressing, Courtney D. ^{[1
]}

Figueira, Pedro ^{[10
]}

Fiorenzano, Aldo F. M. ^{[8
]}

Gettel, Sara ^{[1
]}

Harutyunyan, Avet ^{[8
]}

Horne, Keith ^{[3
]}

Lopez-Morales, Mercedes ^{[1
]}

Lovis, Christophe ^{[6
]}

Mayor, Michel ^{[6
]}

Micela, Giusi ^{[11
]}

Motalebi, Fatemeh ^{[6
]}

Nascimbeni, Valerio ^{[5
]}

Phillips, David F. ^{[1
]}

Piotto, Giampaolo ^{[4
,5
]}

Pollacco, Don ^{[12
]}

Queloz, Didier ^{[6
,13
]}

Rice, Ken ^{[14
]}

Sasselov, Dimitar ^{[1
]}

Sozzetti, Alessandro ^{[2
]}

Szentgyorgyi, Andrew ^{[1
]}

Watson, Chris ^{[15
]}

机构：

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

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

[3] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[4] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35122 Padua, Italy

[5] INAF Osservatorio Astron Padova, I-35122 Padua, Italy

[6] Univ Geneva, Astron Observ, CH-1290 Versoix, Switzerland

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

[8] INAF Fdn Galileo Galilei, E-38712 Brea Baja, Spain

[9] INAF IASF, I-20133 Milan, Italy

[10] Univ Porto, Ctr Astrofis, P-4150762 Oporto, Portugal

[11] INAF Osservatorio Astron Palermo, I-90124 Palermo, Italy

[12] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[13] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[14] Univ Edinburgh, Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland

[15] Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 789卷 / 02期

基金：

瑞士国家科学基金会;

关键词：

planetary systems; stars: individual (Kepler-10 KOI-072 KIC 11904151); stars: statistics; techniques: photometric; techniques: spectroscopic; LIMB-DARKENING COEFFICIENTS; LOWER MAIN-SEQUENCE; CHAIN MONTE-CARLO; TRANSITING PLANET; LIGHT CURVES; SUPER-EARTHS; STELLAR; ABUNDANCE; AGE; ROTATION;

D O I：

10.1088/0004-637X/789/2/154

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Kepler-10b was the first rocky planet detected by the Kepler satellite and confirmed with radial velocity follow-up observations from Keck-HIRES. The mass of the planet was measured with a precision of around 30%, which was insufficient to constrain models of its internal structure and composition in detail. In addition to Kepler-10b, a second planet transiting the same star with a period of 45 days was statistically validated, but the radial velocities were only good enough to set an upper limit of 20 M-circle plus for the mass of Kepler-10c. To improve the precision on the mass for planet b, the HARPS-N Collaboration decided to observe Kepler-10 intensively with the HARPS-N spectrograph on the Telescopio Nazionale Galileo on La Palma. In total, 148 high-quality radial-velocity measurements were obtained over two observing seasons. These new data allow us to improve the precision of the mass determination for Kepler-10b to 15%. With a mass of 3.33 +/- 0.49 M-circle plus and an updated radius of 1.47(-0.02)(+0.03) R-circle plus, Kepler-10b has a density of 5.8 +/- 0.8 g cm(-3), very close to the value predicted by models with the same internal structure and composition as the Earth. We were also able to determine a mass for the 45-day period planet Kepler-10c, with an even better precision of 11%. With a mass of 17.2 +/- 1.9 M-circle plus and radius of 2.35(-0.04)(+0.09) R-circle plus, Kepler-10c has a density of 7.1 +/- 1.0 g cm(-3). Kepler-10c appears to be the first strong evidence of a class of more massive solid planets with longer orbital periods.

引用

页数：14

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