Probing jets from Class 0 protostars

Details Probing jets from Class 0 protostars Probing jets from Class 0 protostars

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50364n&link_type=abstract

Spitzer Proposal ID #50364

Physics

Scientific paper

Flows of matter from young and heavily embedded ``Class 0'' protostars are often observed only at millimeter wavelengths in the form of collimated molecular jets. An important open debate is whether such jets represent the cold external layer of an embedded atomic jet, or whether the jet itself is intrinsically composed of only molecular gas under low excitation conditions. The aim of this proposal is to obtain insight into the composition and excitation of such jets through IRS observations of mid-IR lines, which are unique tracers of the warm embedded gas components. The immediate objectives will be: 1) to detect the atomic/ionic component associated with Class 0 molecular jets; 2) to derive detailed physical quantities to be compared with models for acceleration and propagation of jets, models which have so far only been tested on more evolved CTT stars; 3) to determine if such jets have sufficient momentum and energy to sustain the swept up gas seen further out in the form of near-IR bow shocks. To this aim, a sample of three well-known Class 0 jets have been selected for which near-IR, millimeter and ISO observations are already available. This will ensure a thorough comparison of the different jet excitation components which should ultimately be explained in a unified flow model. The feasibility of this project and the original results that can be obtained by such a project have been demonstrated on one source observed during cycle-2 GO. Here we wish to extend such a study on additional sources in order to derive general conclusions.

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