Friday 3 May at 1:30pm
Jes K Jørgensen - Sterrewacht Leiden
"The physical and chemical structure of low-mass
protostellar envelopes"
ABSTRACT: "In the first initial stages of the evolution of a low mass
protostar, it is surrounded by a collapsing envelope and a circumstellar
disk through which material is accreted. This so-called "class 0" phase
lasts only a very short time (on the order of ten thousand years), but
is critical for the subsequent evolution of the star in determining its
final properties in connection with the mass and chemical composition of
the disk through which planets possibly form at a later stage. In this
talk the first results from a survey of the physical and chemical properties
of a sample of class 0 objects are presented. The physical structure of
the envelopes is established through 1D radiative transfer modelling of
their submillimeter continuum emission and used as input for Monte Carlo
line modelling to determine the chemical properties for comparison with
single dish and millimeter interferometry observations, using especially
the JCMT and OVRO."
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