Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-07
Astronomy and Astrophysics
Astrophysics
To appear in the Spitzer special issue of ApJS; 12 pages, 2 figures
Scientific paper
10.1086/422888
We have used the Spitzer Infrared Spectrograph to observe seven members of the TW Hya association, the nearest stellar association whose age ($\sim$ 10 Myr) is similar to the timescales thought to apply to planet formation and disk dissipation. Only two of the seven targets display infrared excess emission, indicating that substantial amounts of dust still exist closer to the stars than is characteristic of debris disks; however, in both objects we confirm an abrupt short-wavelength edge to the excess, as is seen in disks with cleared-out central regions. The mid-infrared excesses in the spectra of Hen 3-600 and TW Hya include crystalline silicate emission features, indicating that the grains have undergone significant thermal processing. We offer a detailed comparison between the spectra of TW Hya and Hen 3-600, and a model that corroborates the spectral shape and our previous understanding of the radial structure of these protoplanetary disks.
Barry Joseph D.
Brandl Bernhard R.
Calvet Nuria
Chen Christine H.
D'Alessio Paola
No associations
LandOfFree
The state of protoplanetary material 10 Myr after stellar formation: circumstellar disks in the TW Hydrae association 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 The state of protoplanetary material 10 Myr after stellar formation: circumstellar disks in the TW Hydrae association, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The state of protoplanetary material 10 Myr after stellar formation: circumstellar disks in the TW Hydrae association will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-594023