Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mwac.meet..p10k&link_type=abstract
"Midwest Astrochemistry Meeting 2010, held 5-6 November at the University of Illinois at Urbana-Champaign. http://midwest.astroc
Astronomy and Astrophysics
Astronomy
Scientific paper
Circumstellar envelopes of the youngest protostellar systems, the so-called Class 0 young stellar objects (YSOs), harbor conditions of star formation. Recently, we studied the density distribution and the dust opacity spectral index (β) of three Class 0 YSOs (Kwon et al. 2009): L1448 IRS 2, L1448 IRS 3B, and L1157, through visibility modeling of the continuum data at λ = 1.3 mm and 2.7 mm taken by the Combined Array for Research in Millimeter-wave Astronomy (CARMA).We found that β is around 1 indicating significant grain growth at the earliest stage already and that there are two types of density distribution: density power-law index p ~ 1.8 in L1448 IRS 2 and L1157 and p ~ 2.6 in L1448 IRS 3B. Since L1448 IRS 3B is a binary system and younger in terms of the bipolar outflow kinematic time scale, it could indicate a discrepancy of binary star formation and/or an evolutionary change of density distribution. In addition, L1448 IRS 3B has a distinct radial dependence of β presenting dust grain segregation and/or faster grain growth at the central region, which is not clearly detected in the others. To investigate these interesting results further, we have been carrying out a survey of 20 YSOs using CARMA. Preliminary results of the survey also show β ~ 1 and the two types of density distribution. The density distribution and the grain growth should be addressed by successful star formation theories. In addition, these results provide physical conditions of astrochemical modeling toward early stages of star formation.
Kwon Woojin
Looney Leslie W.
Mundy Lee G.
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