A gaseous metal disk around a white dwarf

Gaensicke, B. T.; Marsh, T. R.; Southworth, J.; Rebassa-Mansergas, A.

A gaseous metal disk around a white dwarf

Authors

Gaensicke, B. T.

Marsh, T. R.

Southworth, J.

Rebassa-Mansergas, A.

Description

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.
Published 22 December in Science, added journal ref