Non-detection of the putative substellar companion to HD 149382

Jackson M. Norris, Jason T. Wright, Richard A. Wade, Suvrath Mahadevan, Sara Gettel

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Abstract

It has been argued that a substellar companion may significantly influence the evolution of the progenitors of subdwarf B (sdB) stars. Recently, the bright sdB star HD 149382 has been claimed to host a substellar (possibly planetary) companion with a period of 2.391days. 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 companion, we made 10 radial velocity measurements of HD 149382 over 17days 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 < 28days and Msin i ≳ 1 M Jup.

Original languageEnglish (US)
Article number88
JournalAstrophysical Journal
Volume743
Issue number1
DOIs
StatePublished - Dec 10 2011

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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