Constraining planet structure from stellar chemistry: the cases of CoRoT-7, Kepler-10, and Kepler-93

被引：65

作者：

Santos, N. C. ^{[1
,2
]}

Adibekyan, V. ^{[1
]}

Mordasini, C. ^{[3
]}

Benz, W. ^{[3
]}

Delgado-Mena, E. ^{[1
]}

Dorn, C. ^{[3
]}

Buchhave, L. ^{[4
,5
]}

Figueira, P. ^{[1
]}

Mortier, A. ^{[6
]}

Pepe, F. ^{[7
]}

Santerne, A. ^{[1
]}

Sousa, S. G. ^{[1
]}

Udry, S. ^{[7
]}

机构：

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

[2] Univ Porto, Fac Ciencias, Dept Fis & Astron, P-4169007 Oporto, Portugal

[3] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

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

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

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

[7] Univ Geneva, Observ Geneva, CH-1290 Sauverny, Switzerland

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 580卷

基金：

瑞士国家科学基金会;

关键词：

planetary systems; planets and satellites: detection; stars: abundances; techniques: spectroscopic; MASS-RADIUS RELATIONSHIPS; COMPOSITIONAL DIVERSITY; CHEMICAL-COMPOSITION; GIANT PLANETS; STARS; METALLICITY; ABUNDANCES; PARAMETERS; MODEL; EARTH;

D O I：

10.1051/0004-6361/201526850

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We explore the possibility that the stellar relative abundances of different species can be used to constrain the bulk abundances of known transiting rocky planets. Methods. We use high resolution spectra to derive stellar parameters and chemical abundances for Fe, Si, Mg, O, and C in three stars hosting low mass, rocky planets: CoRoT-7, Kepler-10, and Kepler-93. These planets follow the same line along the mass-radius diagram, pointing toward a similar composition. The derived abundance ratios are compared with the solar values. With a simple stoichiometric model, we estimate the iron mass fraction in each planet, assuming stellar composition. Results. We show that in all cases, the iron mass fraction inferred from the mass-radius relationship seems to be in good agreement with the iron abundance derived from the host star's photospheric composition. Conclusions. The results suggest that stellar abundances can be used to add constraints on the composition of orbiting rocky planets.

引用

页数：5

共 3 条

[1] Constraining planet structure and composition from stellar chemistry: trends in different stellar populations
Santos, N. C.
Adibekyan, V.
Dorn, C.
Mordasini, C.
Noack, L.
Barros, S. C. C.
Delgado-Mena, E.
Demangeon, O.
Faria, J. P.
Israelian, G.
Sousa, S. G.
ASTRONOMY & ASTROPHYSICS, 2017, 608
[2] Bayesian analysis of interiors of HD 219134b, Kepler-10b, Kepler-93b, CoRoT-7b, 55 Cnc e, and HD 97658b using stellar abundance proxies
Dorn, Caroline
Hinkel, Natalie R.
Venturini, Julia
ASTRONOMY & ASTROPHYSICS, 2017, 597
[3] Rocky super-Earth interiors Structure and internal dynamics of CoRoT-7b and Kepler-10b
Wagner, F. W.
Tosi, N.
Sohl, F.
Rauer, H.
Spohn, T.
ASTRONOMY & ASTROPHYSICS, 2012, 541

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