Asymmetric Line Profiles in Spectra of Gaseous Metal Disks Around Single White Dwarfs

Details Asymmetric Line Profiles in Spectra of Gaseous Metal Disks Around Single White Dwarfs Asymmetric Line Profiles in Spectra of Gaseous Metal Disks Around Single White Dwarfs

2011-02-02

arxiv.org/abs/1102.0446v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

8 pages, 5 figures, Part of PlanetsbeyondMS/2010 proceedings (arXiv:1011.6606)

Scientific paper

10.1063/1.3556204

Metal-rich debris disks were discovered around several single DAZ and DBZ white dwarfs, which may stem from disruption of smaller rocky planetesimals. In some cases, the material in addition forms a gaseous disk. For SDSS J122859.93+104032.9, the double peaked infrared Ca II triplet at about 8500 angstrom exhibits a strong red/violet asymmetry. With the Tuebingen non-LTE Accretion Disk code AcDc we calculated the spectrum and vertical structure of the disk, assuming the chemical mixture of the disk's material being similar to a chondrite-like asteroid, the most prominent type in our own solar system. By modifying the code to simulate different non axis-symmetrical disk geometries, the first preliminary results are in good agreement with the observed asymmetric line profile.

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