EPoS Contribution
EPoS Contribution
VLA1623A: the big Keplerian disk of a young Class 0 source

Nadia Murillo
MPE, Garching, DE
When do disks form? Using ALMA Cycle 0 observations we study VLA1623A, the prototypical low-mass Class 0 source located in rho Ophiuchus. Observations detected a disk-like structure in C18O (2-1). Through analysis and modelling of the data we find this source to drive a big (~150AU) Keplerian disk, traced in C18O (2-1). Compared to other Class 0 sources with a reported Keplerian disk, VLA1623A is the youngest Keplerian disk yet observed. This shows that disk formation can indeed occur very early.
Caption: (Left) ALMA observations of C18O (2-1) towards VLA1623A (square). Contours show the intensity-integrated map and the color scale shows the velocity-integrated map. (Center) Keplerian plus Infall model of the C18O disk. Black contours show the observed emission, while the red and blue contours show the model. R_crit indicates the radius at which the velocity structure shifts from Keplerian to Infall whereas R_out is the outer radius of the disk. (Right) Comparisson of the observed and modeled spectral profiles. The gray line shows the model without foreground and the orange line shows the model with foreground added. The black line corresponds to the observations.
Collaborators:
S.-P. Lai, NTHU, Taiwan
S. Bruderer, MPE, Germany
D. Harsono, Leiden, Netherlands
E. F. van Dishoeck, Leiden; MPE, Netherlands; Germany
Key publication

Suggested Sessions: Cores to Disks