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THE DISSIMILAR CHEMICAL COMPOSITION OF THE PLANET-HOSTING STARS OF THE XO-2 BINARY SYSTEM

Ramírez, I; Khanal, S.; Aleo, P.; Sobotka, A.; Liu, Fan; Casagrande, Luca; Meléndez, J; Yong, David; Lambert, David L; Asplund, Martin

Description

Using high-quality spectra of the twin stars in the XO-2 binary system, we have detected significant differences in the chemical composition of their photospheres. The differences correlate strongly with the elements' dust condensation temperature. In XO-2N, volatiles are enhanced by about 0.015 dex and refractories are overabundant by up to 0.090 dex. On average, our error bar in relative abundance is 0.012 dex. We present an early metal-depletion scenario in which the formation of the gas...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
URI: http://hdl.handle.net/1885/103198
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/808/1/13

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