Mass and Temperature of the TWA 7 Debris Disk

Details Mass and Temperature of the TWA 7 Debris Disk Mass and Temperature of the TWA 7 Debris Disk

2007-04-03

arxiv.org/abs/0704.0463v1

Astrophys.J.663:1103-1109,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/518643

We present photometric detections of dust emission at 850 and 450 micron around the pre-main sequence M1 dwarf TWA 7 using the SCUBA camera on the James Clerk Maxwell Telescope. These data confirm the presence of a cold dust disk around TWA 7, a member of the TW Hydrae Association. Based on the 850 micron flux, we estimate the mass of the disk to be 18 lunar masses (0.2 Earth masses) assuming a mass opacity of 1.7 cm^2/g with a temperature of 45 K. This makes the TWA 7 disk (d=55 pc) an order of magnitude more massive than the disk reported around AU Microscopii (GL 803), the closest (9.9 pc) debris disk detected around an M dwarf. This is consistent with TWA 7 being slightly younger than AU Mic. We find that the mid-IR and submillimeter data require the disk to be comprised of dust at a range of temperatures. A model in which the dust is at a single radius from the star, with a range of temperatures according to grain size, is as effective at fitting the emission spectrum as a model in which the dust is of uniform size, but has a range of temperatures according to distance. We discuss this disk in the context of known disks in the TW Hydrae Association and around low-mass stars; a comparison of masses of disks in the TWA reveals no trend in mass or evolutionary state (gas-rich vs. debris) as a function of spectral type.

Affiliated with

Also associated with

No associations

Rating

Mass and Temperature of the TWA 7 Debris Disk 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 Mass and Temperature of the TWA 7 Debris Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass and Temperature of the TWA 7 Debris Disk will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-213200