CARBON AND OXYGEN ABUNDANCES IN THE HOT JUPITER EXOPLANET HOST STAR XO-2B AND ITS BINARY COMPANION

被引：18

作者：

Teske, Johanna K. ^{[1
]}

Schuler, Simon C. ^{[2
]}

Cunha, Katia ^{[1
,3
]}

Smith, Verne V. ^{[4
]}

Griffith, Caitlin A. ^{[5
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Univ Tampa, Tampa, FL 33606 USA

[3] Observ Nacl, BR-20921400 Rio De Janeiro, RJ, Brazil

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

[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 768卷 / 01期

关键词：

planets and satellites: formation; planets and satellites: individual (XO-2); stars: abundances; stars: atmospheres; PLANET FORMATION; EXTRASOLAR PLANET; WATER-VAPOR; ATMOSPHERE; RATIO; SUN; METALLICITIES; TEMPERATURE; TELESCOPE; TRENDS;

D O I：

10.1088/2041-8205/768/1/L12

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With the aim of connecting the compositions of stars and planets, we present the abundances of carbon and oxygen, as well as iron and nickel, for the transiting exoplanet host star XO-2N and its wide-separation binary companion XO-2S. Stellar parameters are derived from high-resolution, high signal-to-noise spectra, and the two stars are found to be similar in their T-eff, log g, iron ([Fe/H]), and nickel ([Ni/H]) abundances. Their carbon ([C/H]) and oxygen ([O/H]) abundances also overlap within errors, although XO-2N may be slightly more C-rich and O-rich than XO-2S. The C/O ratios of both stars (similar to 0.60 +/- 0.20) may also be somewhat larger than solar (C/O similar to 0.50). The XO-2 system has a transiting hot Jupiter orbiting one binary component but not the other, allowing us to probe the potential effects planet formation might have on the host star composition. Additionally, with multiple observations of its atmosphere the transiting exoplanet XO-2b lends itself to compositional analysis, which can be compared to the natal chemical environment established by our binary star elemental abundances. This work sets the stage for determining how similar or different exoplanet and host star compositions are, and the implications for planet formation, by discussing the C/O ratio measurements in the unique environment of a visual binary system with one star hosting a transiting hot Jupiter.

引用

页数：6

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