Colors, Parallax and Orbit of GL229B

Details Colors, Parallax and Orbit of GL229B Colors, Parallax and Orbit of GL229B

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6338k&link_type=abstract

HST Proposal ID #6338

Other

Hst Proposal Id #6338 Cool Stars

Scientific paper

Recently we discovered a low luminosity, cool proper-motion companion to the nearby star GL 229. We see strong absorption features in the companion's H- and K-band spectra that resemble those of Jupiter and that are usually ascribed to methane. From chemical thermodynamics, we know that carbon mainly resides in methane when the temperature is below 1000 K. The totality of the data is consistent with a 20 Jupiter mass object orbiting GL 229 at 7.6 arcsec {44 AU}. This is the first detection of such a cool condensed object. We propose HST observations to determine the parallax of the object, which is essential for interpreting the photometric data, and to search for other companions that may be fainter or closer to the main star.

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