A Substellar Common Proper-motion Companion to the Pleiad H II 1348
Abstract
We announce the identification of a proper-motion companion to the star H II 1348, a K5 V member of the Pleiades open cluster. The existence of a faint point source 1farcs1 away from H II 1348 was previously known from adaptive optics imaging by Bouvier et al. However, because of a high likelihood of background star contamination and in the absence of follow-up astrometry, Bouvier et al. tentatively concluded that the candidate companion was not physically associated with H II 1348. We establish the proper-motion association of the pair from adaptive optics imaging with the Palomar 5 m telescope. Adaptive optics spectroscopy with the integral field spectrograph OSIRIS on the Keck 10 m telescope reveals that the companion has a spectral type of M8 ± 1. According to substellar evolution models, the M8 spectral type resides within the substellar mass regime at the age of the Pleiades. The primary itself is a known double-lined spectroscopic binary, which makes the resolved companion, H II 1348B, the least massive and widest component of this hierarchical triple system and the first substellar companion to a stellar primary in the Pleiades.
Additional Information
© 2012 American Astronomical Society. Received 2011 October 13; accepted 2011 December 7; published 2012 January 23. Partial support for S.A.M. was provided through the Spitzer Fellowship Program under award 1273192. The authors also wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Facilities: Keck:II, HaleAttached Files
Published - Geissler2012p18206Astrophys_J.pdf
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Additional details
- Eprint ID
- 31600
- Resolver ID
- CaltechAUTHORS:20120522-140334989
- NASA Spitzer Fellowship
- 1273192
- Created
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2012-05-22Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field