Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...630l.185c&link_type=abstract
The Astrophysical Journal, Volume 630, Issue 2, pp. L185-L188.
Astronomy and Astrophysics
Astronomy
176
Accretion, Accretion Disks, Stars: Circumstellar Matter, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present Spitzer Infrared Spectrograph (IRS) observations of two objects of the Taurus population that show unambiguous signs of clearing in their inner disks. In one of the objects, DM Tau, the outer disk is truncated at 3 AU; this object is akin to another recently reported in Taurus, CoKu Tau/4, in that the inner disk region is free of small dust. Unlike CoKu Tau/4, however, this star is still accreting, so optically thin gas should still remain in the inner disk region. The other object, GM Aur, also accreting, has ~0.02 lunar masses of small dust in the inner disk region within ~5 AU, consistent with previous reports. However, the IRS spectrum clearly shows that the optically thick outer disk has an inner truncation at a much larger radius than previously suggested, ~24 AU. These observations provide strong evidence for the presence of gaps in protoplanetary disks.
Barry Joseph D.
Calvet Nuria
D'Alessio Paola
Forrest William John
Franco-Hernández Ramiro
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