Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480

Details Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480 Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480

2007-01-15

arxiv.org/abs/astro-ph/0701425v1

Astronomy and Astrophysics

Astrophysics

Astronomy and Astrophysics (2007) accepted in 2007

Scientific paper

10.1051/0004-6361:20066537

We report sub-arcsec CO observations of the disks around MWC 480, LkCa 15 and DM Tau, and simultaneous measurements of HCO+ J=1-0. We derive the disk properties by fitting a standard disk model, with all parameters power laws of the distance to the star. Biases are explained and discussed. We find evidence for vertical temperature gradient in the disks of MWC 480 and DM Tau, as in AB Aur, but not in LkCa 15. The disks temperature increase with stellar effective temperature. Most of the CO gas is at temperatures smaller than 17 K, the condensation temperature on grains. The scale height of the CO distribution appears larger (by 50%) than the hydrostatic scale height. The more UV luminous stars have more CO, but there is no simple dependency of CO abundance and isotopologue ratio with stellar type. The 13CO/HCO+ ratio is around 600. The temperature behaviour is consistent with expectations, but published chemical models have difficulty reproducing the observed CO quantities. Vertical mixing and photo-dissociation at the disk outer edge seem important chemical agents. The CO data suggest a more complex surface density distribution than assumed in models.

Affiliated with

Also associated with

No associations

Rating

Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480 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 Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-187922