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Gl86B: a white dwarf orbits an exoplanet host star

By SpaceRef Editor
August 10, 2005
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Astrophysics, abstract

From: Markus Mugrauer [view email]
Date: Tue, 14 Jun 2005 15:48:00 GMT (830kb)

Gl86B: a white dwarf orbits an exoplanet host star

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.

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