Gl86B: a white dwarf orbits an exoplanet host star

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dc.creatorMugrauer, M.
dc.creatorNeuhaeuser, R.
dc.date2005-06-14
dc.date.accessioned2026-07-07T02:17:57Z
dc.date.available2026-07-07T02:17:57Z
dc.descriptionIn 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.
dc.description5 pages, 5 figures, MNRAS letter
dc.identifierhttps://arxiv.org/abs/astro-ph/0506311
dc.identifierhttp://arxiv.org/abs/astro-ph/0506311
dc.identifier2005MNRAS.tmpL..50M
dc.identifierdoi:10.1111/j.1745-3933.2005.00055.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9312
dc.subjectAstrophysics
dc.titleGl86B: a white dwarf orbits an exoplanet host star
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