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

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Volume 580 (August 2015)

A&A, 580 (2015) L13

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Table 1

Mass fractions of heavy element, total fraction of heavy elements, and iron mass fraction among refractory species (values in %).

Quantity	C-7	K-93	K-10	Sun	Sun^f

H₂O^a	0.75 ± 0.31	0.54 ± 0.22	0.98 ± 0.20	0.50	0.51
CH₄^a	0.32 ± 0.05	0.35 ± 0.13	0.36 ± 0.04	0.37	0.29
Fe^a	0.14 ± 0.01	0.09 ± 0.01	0.10 ± 0.00	0.13	0.17^d
MgSiO₃^a	0.25 ± 0.08	0.10 ± 0.06	0.11 ± 0.05	0.19	0.27^e
Mg₂SiO₄^a	0.05 ± 0.06	0.08 ± 0.06	0.14 ± 0.06	0.08	0.27^e

Z^b	1.50 ± 0.31	1.17 ± 0.25	1.69 ± 0.21	1.26	1.32

f_iron^c	31.6 ± 2.6	34.7 ± 3.7	27.5 ± 1.7	33.2	38.0

Notes.

^(a)

The m_H2 and m_He are between 74.7−75.1% and 23.6−23.7%, respectively.

^(b)

Summed mass percent of all heavy elements.

^(c)

m_Fe/ (m_Fe + m_MgSiO3 + m_Mg2SiO4).

^(d)

Includes all metal species and FeS.

^(e)

Includes all silicates and oxides.

^(f)

Lodders (2003).

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