SMA Observations on a Very Low Luminosity Object

Details SMA Observations on a Very Low Luminosity Object SMA Observations on a Very Low Luminosity Object

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541441h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #414.41; Bulletin of the American Astronomical Society, Vol. 36, p.1113

Astronomy and Astrophysics

Astronomy

Scientific paper

Studying young stellar objects with extremely low luminosity (Very Low Luminosity Objects, VeLLOs) provide us great opportunity for investigating the initial conditions of star formation and the formation of brown dwarfs. We study the dynamical and chemical properties of a VeLLO - DCE 065 using Submillimeter Array (SMA). The most promising result from DCE 065 is that both CO and N2D+ are depleted toward the protostar, confirming that the core is extremely young. We also detect high velocity red and blue shifted components in 12CO, suggesting the possible outflow activities. Although the missing flux prevents us to see the whole picture of the outflows, the proto (or pseudo) disk is clearly detected in the dust continuum and N2D+. The N2D+ line is extremely narrow ( 0.2 km/s) and the line width is comparable to its velocity gradient across the major axis. Assuming the rotation of proto disk is contributed by central protostar, the derived mass of central star is 0.02 solar mass. With the consideration of the sub solar mass envelope, DCE 065 may present a scenario that a brown dwarf can be formed from the collapsing processes of a core.
CLH and SPL are supported by National Science Council of Taiwan under grant NSC 96-2112-M-007-019-MY2 and NSC 98-2112-M-007-007-MY3.

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