Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734009b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #340.09; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present high spatial resolution interferometric observations of the molecular gas and dust surrounding Barnard 5 IRS1, a deeply embedded, low-mass protostellar core in the Perseus star-forming region. Continuum emission at 272 GHz (1.1mm) and molecular lines HCO+ J=3-2 and HCN J=3-2 were imaged at spatial resolution of 0.5"-2" (125-500 AU) to investigate Class I YSO disk and envelope structure and dynamics. B5 IRS1 continuum emission appears resolved even on the shortest baselines, and shows a compact, elongated structure perpendicular to the outflow axis. Assuming the emission traces a dusty disk, we estimate a lower limit disk mass of 0.02M&sun;. Paired with singe-dish submillimeter observations, we use our disk mass estimate to calculate an envelope mass estimate of 0.21M&sun;. B5 IRS1 is one of only a few Class I young stellar objects which show emission and a velocity gradient in HCO+ J=3-2. If this kinematic pattern is interpreted as a signature of rotation around a central object, then we calculate a mass of 0.1M&sun; and place this source in the context of recent surveys. Discussion and uncertainties are presented regarding limitations of methods.
Bourke Tyler L.
Brassfield Erin
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