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ALMA observations of a misaligned binary protoplanetary disk system in Orion | | Jonathan P. Williams
; Rita K. Mann
; James Di Francesco
; Sean M. Andrews
; A. Meredith Hughes
; Luca Ricci
; John Bally
; Doug Johnstone
; Brenda Matthews
; | | Date: |
14 Oct 2014 | | Abstract: | We present ALMA observations of a wide binary system in Orion, with projected
separation 440 AU, in which we detect submillimeter emission from the
protoplanetary disks around each star. Both disks appear moderately massive and
have strong line emission in CO 3-2, HCO+ 4-3, and HCN 3-2. In addition, CS 7-6
is detected in one disk. The line-to-continuum ratios are similar for the two
disks in each of the lines. From the resolved velocity gradients across each
disk, we constrain the masses of the central stars, and show consistency with
optical-infrared spectroscopy, both indicative of a high mass ratio ~9. The
small difference between the systemic velocities indicates that the binary
orbital plane is close to face-on. The angle between the projected disk
rotation axes is very high, ~72 degrees, showing that the system did not form
from a single massive disk or a rigidly rotating cloud core. This finding,
which adds to related evidence from disk geometries in other systems,
protostellar outflows, stellar rotation, and similar recent ALMA results,
demonstrates that turbulence or dynamical interactions act on small scales well
below that of molecular cores during the early stages of star formation. | | Source: | arXiv, 1410.3570 | | Services: | Forum | Review | PDF | Favorites | |
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