Astrophysics, abstract
astro-ph/0612697

From: Thomas Richard Marsh [view email]

Date: Fri, 22 Dec 2006 19:09:51 GMT (139kb)

A gaseous metal disk around a white dwarf

Authors: B.T. Gänsicke, T.R. Marsh, J. Southworth, A. Rebassa-Mansergas

Comments: Published 22 December in Science

The destiny of planetary systems through the late evolution of their host stars is very uncertain. We report a metal-rich gas disk around a moderately hot and young white dwarf. A dynamical model of the double-peaked emission lines constrains the outer disk radius to just 1.2 solar radii. The likely origin of the disk is a tidally disrupted asteroid, which has been destabilised from its initial orbit at a distance of more than 1000 solar radii by the interaction with a relatively massive planetesimal object or a planet. The white dwarf mass of 0.77 solar masses implies that planetary systems may form around high-mass stars.

http://arxiv.org/abs/astro-ph/0612697