SIMBAD references

2007ApJ...663.1103M - Astrophys. J., 663, 1103-1109 (2007/July-2)

Mass and temperature of the TWA 7 debris disk.


Abstract (from CDS):

We present photometric detections of dust emission at 850 and 450 µm 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 (TWA). Based on the 850 µm flux, we estimate the mass of the disk to be 18 Mlunar (0.2 M) assuming a mass opacity of 1.7 cm2/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 TWA 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.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - stars: individual (TWA 7) - Stars: Pre-Main-Sequence - Submillimeter

Simbad objects: 25

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