Accueil > Séminaires d’Astrophysique > Life and death : studying shocks of protostellar outflows and supernovae with Spitzer

 

Life and death : studying shocks of protostellar outflows and supernovae with Spitzer

Achim Tappe (Spitzer Science Center, California Institute of Technology, Pasadena, Etats Unis)

Par Stephane Charpinet - 12/11/2007

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Achim TAPPE

 (Spitzer Science Center, California Institute of Technology, Pasadena, Etats Unis)

Jeudi 20 Décembre 2007 à 11h

CESR


Life and death : studying shocks of protostellar outflows and supernovae with Spitzer

Shocks driven by a variety of sources strongly influence the chemistry and physics in the interstellar medium : they accelerate, heat, and compress interstellar gas, erode dust grains, and affect interstellar chemistry. We can study many of the underlying physical and chemical processes using Spitzer’s high sensitivity and mid-IR spectral mapping capabilities.

In this talk, I present recent Spitzer spectra connected to both extremes of the stellar life cycle, supernovae and protostellar outflows. In particular, I discuss the detection of polycyclic aromatic hydrocarbon (PAH) bands associated with the oxygen-rich supernova remnant N132D in the Large Magellanic Cloud. Can dust and PAHs survive the aftermath of a supernova explosion ? How is the answer to this question potentially related to the emergence of life on Earth ? The second example is the high-resolution spectrum of the HH211 protostellar outflow.

This exceptionally rich spectrum shows a sequence of very high-J OH emission, several pure rotational H2O transitions, H2 0-0 S(0) to S(7), HD 0-0 R(3) to R(6), and atomic fine-structure lines from Fe+, Si+, Ne+, S, and Cl. The large number of lines from rotationally excited molecules in combination with the fine-structure transitions provide valuable diagnostics to analyze the shock excitation conditions in detail.

 

 

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Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

CNRS (Midi-Pyrénées)

Univ. Paul Sabatier

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