ABUNDANCES OF REFRACTORY ELEMENTS FOR G-TYPE STARS WITH EXTRASOLAR PLANETS

We confirm the difference in chemical abundance between stars with and without exoplanets and present the relation between chemical abundances and physical properties of exoplanets, such as planetary mass and the semimajor axis of planetary orbit. We obtained the spectra of 52 G-type stars from the...

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Bibliographic Details
Published in:The Astrophysical journal 2011-08, Vol.736 (2), p.87-jQuery1323905336286='48'
Main Authors: KANG, Wonseok, LEE, Sang-Gak, KIM, Kang-Min
Format: Article
Language:English
Subjects:
ABUNDANCE
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Earth, ocean, space
ELEMENT ABUNDANCE
ELEMENTS
Exact sciences and technology
METALS
PHYSICAL PROPERTIES
PLANETS
STARS
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Summary:We confirm the difference in chemical abundance between stars with and without exoplanets and present the relation between chemical abundances and physical properties of exoplanets, such as planetary mass and the semimajor axis of planetary orbit. We obtained the spectra of 52 G-type stars from the Bohyunsan Optical Astronomy Observatory (BOAO) Echelle Spectrograph and carried out abundance analyses for 12 elements: Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, and Ni. We first found that the [Mn/Fe] ratios of planet-host stars are higher than those of comparison stars over the entire metallicity range, and we then found that in metal-poor stars of [Fe/H] < --0.4 the abundance difference was larger than in metal-rich samples, especially for the elements of Mg, Al, Sc, Ti, V, and Co. After examining the relation between planet properties and metallicities of planet-host stars, we observed that planet-host stars with low metallicities tend to have several low-mass planets (J) instead of a massive gas-giant planet.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/736/2/87