Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542519l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.19; Bulletin of the American Astronomical Society, Vol. 42, p.339
Astronomy and Astrophysics
Astronomy
Scientific paper
Detailed studies of the spectral energy distributions of young stars can reveal much about their basic properties and circumstellar environment. We seek to test the predictions of disk locking theories that describe the angular momentum evolution of young stars. To do so, we compare Spitzer Space Telescope measurements of a sample of stars in the young cluster IC348 to a grid of model star+disk spectral energy distributions that covers a wide range of disk parameter space. In particular we seek to test whether the inner edges of the circumstellar disks are truncated at the co-rotation radius, where some disk-locking theories specifically predict the star-disk linkage to occur.
Preliminary results show that the disks in a majority of our sample population are truncated at co-rotation and/or at the dust sublimation radius. Our SED analysis depends on the detection of the dusty disk, however; our methods are insensitive to dust-free gas disks inward of the sublimation radius. Our data is consistent with most dusty disks being truncated at co-rotation, as postulated by the disk-locking theory. The suggestion is then that the postulated disk-locking theory is plausible for a subset of stars. Approximately 1/3 of the sample stars do not have disks truncated at co-rotation as predicted by the disk locking theory; the subsequent angular momentum evolution of these stars must proceed without disk locking.
Covey Kevin R.
LeBlanc Thompson S.
Stassun Keivan G.
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