The New Class of Dusty DAZ White Dwarfs

Details The New Class of Dusty DAZ White Dwarfs The New Class of Dusty DAZ White Dwarfs

2007-03-18

arxiv.org/abs/astro-ph/0703473v1

Astrophys.J.662:544-551,2007

Astronomy and Astrophysics

Astrophysics

27 pages, 7 figures, ApJ accepted

Scientific paper

10.1086/518108

Our mid-infrared survey of 124 white dwarfs with the Spitzer Space Telescope and the IRAC imager has revealed an infrared excess associated with the white dwarf WD 2115-560 naturally explained by circumstellar dust. This object is the fourth white dwarf observed to have circumstellar dust. All four are DAZ white dwarfs, i.e. they have both photospheric Balmer lines and photospheric metal lines. We discuss these four objects as a class, which we abbreviate "DAZd", where the "d" stands for "dust". Using an optically-thick, geometrically-thin disk model analogous to Saturn's rings, we find that the inner disk edges are at >~0.1 to 0.2 Ro and that the outer disk edges are ~0.3 to 0.6 Ro. This model naturally explains the accretion rates and lifetimes of the detected WD disks and the accretion rates inferred from photospheric metal abundances.

Affiliated with

Also associated with

No associations

Rating

The New Class of Dusty DAZ White Dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The New Class of Dusty DAZ White Dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The New Class of Dusty DAZ White Dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-212822