Non-Detection of the Putative Substellar Companion to HD 149382

It has been argued that a substellar companion may significantly influence the evolution of the progenitors of sdB stars. Recently, the bright sdB star HD 149382 has been claimed to host a substellar (possibly planetary) companion with a period of 2.391 days. This has important implications for the...

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Published inarXiv.org
Main Authors Norris, Jackson M, Wright, Jason T, Wade, Richard A, Mahadevan, Suvrath, Gettel, Sara
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.10.2011
Subjects
Elliptical galaxies
Extrasolar planets
Physics - Solar and Stellar Astrophysics
Radial velocity
Space telescopes
Stellar evolution
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Summary:It has been argued that a substellar companion may significantly influence the evolution of the progenitors of sdB stars. Recently, the bright sdB star HD 149382 has been claimed to host a substellar (possibly planetary) companion with a period of 2.391 days. This has important implications for the evolution of the progenitors of sdB stars as well as the source of the UV-excess seen in elliptical galaxies. In order to verify this putative planet, we made 10 radial velocity measurements of HD 149382 over 17 days with the High Resolution Spectrograph at the Hobby-Eberly Telescope. Our data conclusively demonstrate that the putative substellar companion does not exist, and they exclude the presence of almost any substellar companion with P < 28 days and Msin i >~ 1 Mjup.
ISSN:2331-8422
DOI:10.48550/arxiv.1110.1384