VANDAM Perseus Survey
The VANDAM survey is a 264 hour Karl G. Jansky Very Large Array (VLA) survey of all known protostars in the Perseus molecular cloud, at a distance of ~300 parsecs. The survey is being conducted at wavelengths of 8 mm, 1 cm, 4cm and 6.4 cm using the Ka-band and C-band receiver systems. The observations are being conducted in two array configurations at Ka-band; A configuration for the highest resolution and B configuration for more sensitivity to compact, extended structure. The best resolutions in A and B configurations are is ~0.065" (15 AU) and in B-configuration ~0.2 46 AU), respectively.Follow-up studies are on-going with ALMA examining molecular line and continuum data toward multiples systems and disk candidates. Those data will also be released when possible.
VANDAM Orion Survey
The VANDAM survey has been extended to the protostars in the Orion Molecular Clouds using both the VLA and ALMA. A 9.1 hour ALMA survey at 0.87 mm has observed 328 protostars identified by the Herschel Orion Protostar Survey (HOPS) in the continuum, 12CO J=3-2 and 13CO J=3-2 lines. The resolution is ~0.1" toward the entire sample. A 350 hour VLA large program has observed 100 of the youngest Orion protostars in A and C configuration of the VLA at ~0.08" resolution at 8mm and 1cm. Follow-up observations toward 40 multiple systems was conducted with ALMA in Cycle 6.Data Release Timeline
All Ka-band imaging and measurement sets are available at http://jansky.nhn.ou.eduA subset of the A and B configuration data are available on the Harvard Dataverse https://dataverse.harvard.edu/dataverse/VANDAM
The Orion data will be hosted at https://dataverse.harvard.edu/dataverse/VANDAMOrion and a data release is aimed to happen in December 2019. The data release will include VLA and ALMA images of each target, 12CO images, 13CO images, and ALMA 0.87mm measurement sets.
Goals
- Characterize the frequency of multiplicity in the protostellar phase
- Determine the distributions of protostellar companion separations
- Resolve disks surrounding protostellar sources
- Characterize spectral index of dust emission
- Characterize emission from protostellar jets at centimeter wavelengths
Status
Perseus B-configuration observations - Completed 11/2013Perseus A-configuration observations - Completed 9/11/2015
Orion ALMA observations - Compeleted 07/2017
Orion VLA observations - Completed 01/2017