Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534503m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #345.03; Bulletin of the American Astronomical Society, Vol. 42, p.451
Astronomy and Astrophysics
Astronomy
Scientific paper
The first 1 Myr in the lifetime of a young star are some of the most interesting and, unfortunately, least understood due to the obscuring effects of extinction from the molecular cloud material and infalling envelope. Recent Spitzer Infrared Spectrograph surveys of Taurus, the low-mass star-forming region exemplar, have determined that 1-2 Myr old disks tend to be highly settled with signs of grain growth, crystallization, and planet-formation. With the largest mid-infrared spectroscopic survey of the heavily embedded Ophiuchus star-forming region to date and the new McClure (2009) molecular cloud extinction law, we are able to penetrate up to Av 40, revealing the details of proto-planetary disks at < 1 Myr. Using a new, extinction-independent index to classify our sample into systems dominated by envelopes, disks, or photospheres, we arrive at a 10% embedded objects fraction, yielding an embedded lifetime of 0.2 Myr, similar to that seen in Taurus. Our analysis of the degree of dust sedimentation and dust grain processing in the disks suggest that the young population is as highly settled as the disk population in Taurus, with signs of significant dust processing even at 0.3 Myr. We discuss the wealth of evidence for radial structures which could be evidence for disk-planet interactions and explore the effects of stellar multiplicity on the degree of settling and radial structure. Our results indicate that disk structure and composition must evolve quickly, even during the infall phase.
This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Support for this work was provided by NASA through contract number 1257184 issued by JPL/Caltech, JPL contract 960803 to Cornell University, and Cornell subcontracts 31419-5714 to the University of Rochester.
Calvet Nuria
Chiang Huanching
D'Alessio Paola
Espaillat Catherine
Forrest William
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