Null Detection of a Substellar Companion to HD 149382

Details Null Detection of a Substellar Companion to HD 149382 Null Detection of a Substellar Companion to HD 149382

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812807n&link_type=abstract

American Astronomical Society, AAS Meeting #218, #128.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Soker (1998) argued that a substellar companion may significantly influence the evolution of the progenitors of sdB stars. Recently, Geier et al. (2009) have claimed that the bright sdB star HD 149382 hosts a substellar companion with a period of 2.391 days and mass of 8-23 Jupiter masses. If true, this would have 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 substellar companion, we obtained 40 exposures of HD 149382 over 17 days with the High Resolution Spectrograph at the Hobby-Eberly Telescope. Our data are inconsistent with the claim by Geier et al. and support the absence of the substellar companion.

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