Jets from Class 0 protostars: a mid-infrared view from Spitzer

Seminar Date: 
11 Feb 2010 - 14:00
Dr. Odysseas Dionatos
University of Athens

Jets are an important component of the star-formation process, as they are believed to remove the excess angular momentum from the protostellar system and therefore allowing the accretion of material onto the protostar to proceed. Jets are associated with all protostellar stages, however they appear to have quite different properties as a protostar evolves. In later protostellar phases, jets are commonly traced in atomic emission, detected in the optical and near-IR bands. Flows of matter from very young and heavily embedded protostars –the so-called Class 0 objects – are often observed only at millimeter and submillimeter wavelengths in the form of collimated molecular jets. It is not yet clear if such jets are intrinsically molecular, or whether these formations represent an external layer of an embedded atomic jet – observed only at later evolutionary stages. In this context, I will be discussing the results of mid-IR spectroscopic observations with Spitzer Space Telescope, aiming to get an insight on the composition, excitation and dynamics of jets from Class 0 sources