Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA

Details Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA

2009-11-18

arxiv.org/abs/0911.3653v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17 pages; 15 figures; Accepted by A&A

Scientific paper

Models predict that in the innermost AU of the disk around Herbig Ae/Be star, the dust disk forms a "puffed-up" inner rim, which should result in a strongly asymmetric brightness distribution for disks seen under intermediate inclination. Using the VLTI/AMBER long-baseline interferometer, we obtained 24 near-infrared (H- and K-band) spectro-interferometric observations on the Herbig Ae star R CrA. In the derived visibility function, we detect the signatures of an extended (25 mas) and a compact component (5.8 mas), with the compact component contributing about 2/3 of the total flux. The brightness distribution is highly asymmetric, as indicated by the strong closure phases (up to 40 deg) and the detected position angle dependence of the visibilities and closure phases. To interpret these asymmetries, we employ geometric as well as physical models, including a binary model, a skewed ring model, and a puffed-up inner rim model with a vertical or curved rim shape. Our curved puffed-up rim model can reasonably well reproduce the interferometric observables and the SED simultaneously and suggests a luminosity of 29 L_sun and the presence of relatively large (> 1.2 micron) Silicate dust grains. Perpendicular to the disk, two bow shock-like structures appear in the associated reflection nebula NGC 6729, suggesting that the resolved sub-AU size disk is the driving engine of a large-scale outflow. Detecting, for the first time, strong non-localized asymmetries in the inner regions of a Herbig Ae disk, our study supports the existence of a puffed-up inner rim in YSO disks.

Affiliated with

Also associated with

No associations

Rating

Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA 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 Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R CrA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-452040