Gaseous Material Orbiting the Polluted, Dusty White Dwarf HE1349-2305
Carl Melis, P. Dufour, J. Farihi, J. Bochanski, Adam J. Burgasser, S., Parsons, B. Gaensicke, D. Koester, Brandon Swift
TL;DR
This study reports the discovery of gaseous metallic debris orbiting and accreting onto the white dwarf HE1349-2305, marking it as the first such gas disk-hosting polluted white dwarf identified.
Contribution
It is the first detection of a gas disk around a polluted white dwarf among previously known cases, expanding understanding of white dwarf pollution mechanisms.
Findings
Detection of CaII infrared triplet emission indicating gaseous debris
Measured atmospheric abundances of magnesium and silicon
Upper limits set for iron and oxygen
Abstract
We present new spectroscopic observations of the polluted, dusty, helium-dominated atmosphere white dwarf star HE1349-2305. Optical spectroscopy reveals weak CaII infrared triplet emission indicating that metallic gas debris orbits and is accreted by the white dwarf. Atmospheric abundances are measured for magnesium and silicon while upper limits for iron and oxygen are derived from the available optical spectroscopy. HE1349-2305 is the first gas disk-hosting white dwarf star identified amongst previously known polluted white dwarfs. Further characterization of the parent body polluting this star will require ultraviolet spectroscopy.
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