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Astronomy Tea Talks at Caltech

Mondays, Robinson 106
Tea:  4.00pm
Talk: 4.15pm

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2007 - 2008 season:
22 January 2008
Tim van Kempen (Leiden)

"The warm and dense gas of embedded low-mass protostars"

Embedded low-mass protostars, also known as the Class 0 and Class I evolutionary
stages, have been studied extensively the last decade. Although much is known about
the cold outer regions on scales of a few tens of thousand of AU from dust and gas
studies, far less information exists about the inner regions, where the dense and
warm gas is located. The dense gas in the center, close to where the material in
the envelope accretes onto the central star and disk system, is studied using
molecular lines with the new HARP-B array on the JCMT for a large sample of
embedded objects in the L1688 region. Comparison between high density and cloud
material tracers characterizes these inner regions of embedded sources. In
addition, it is found that many sources thought to be embedded from (near)-IR
studies, are not embedded, but confused by geometrical effects.
The warm gas, with temperatures above 100 Kelvin, is studied using the new 650/800
GHz heterodyne array receiver CHAMP+ on the APEX telescope. Such studies
disentangle the warm gas heated thermally from that shock heated by the outflowing
gas. First results of CO isotopologues of a recently started project will be
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Last modified on 20th Jul 2011 by Johan Richard.  

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