SETI public: Gl86B: a white dwarf orbits an exoplanet host star

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Paper: astro-ph/0506311
Date: Tue, 14 Jun 2005 15:48:00 GMT (830kb)

Title: Gl86B: a white dwarf orbits an exoplanet host star

Authors: M. Mugrauer, R. Neuhaeuser
Comments: 5 pages, 5 figures, MNRAS letter
Journal-ref: 2005MNRAS.tmpL..50M
DOI: 10.1111/j.1745-3933.2005.00055.x
\\
In this letter we present our first high contrast NACO/SDI observations of
the exoplanet host star Gl86 and results from NACO spectroscopy. Els et al.
(2001) found a faint co-moving companion located only ~2arcsec east of the
exoplanet host star Gl86A. Our high contrast SDI observations rule out
additional stellar companions from 1AU up to 23AU, and are sensitive for
faint
T dwarf companions down to 35MJup. We present evidence for orbital motion of
Gl86B around the exoplanet host star Gl86A, which finally confirms that this
is
a bound binary system. With the given photometry from Els et al. (2001) and
the
obtained NACO spectroscopy we prove that the companion Gl86B is a cool white
dwarf with an effective temperature of 5000+-500K. This is the first
confirmed
white dwarf companion to an exoplanet host star and the first observational
confirmation that planets survive the post main sequence evolution of a star
from which they are separated by only one to two dozen astronomical units
(giant phase and planetary nebula) as expected from theory.

\\ ( http://arXiv.org/abs/astro-ph/0506311 , 830kb)

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