The accretion/ejection paradigm in Young Stellar Objects: from optical/NIR to FIR and mm observations

Seminar Date: 
29 Oct 2009 - 15:00
Speaker: 
Dr. Linda Podio
School of Cosmic Physics, Dublin Institute for Advanced Studies

Stellar jets are observed in association with young accreting stars and are believed to play a key role in the overall star formation process. For example, they may be responsible for the removal of excess angular momentum from the material in the disk, thus letting it move toward the star and accrete onto it.

My research activity has been aimed to study the physics and the origin of stellar jets through the analysis of observations taken mainly in the optical and the near-infrared wavelength range. In order to investigate the jet structure both on large scales (from hundreds of AU up to parsec scales) and at their base (on scales between a few and hundred AU) I used spectral diagnostic techniques to analyse observations taken at different angular/spectral resolution. This approach allowed me to address some outstanding issues related to: the propagation and subsequent impact of jets on the interstellar medium and the associated chemistry; the mechanism that accelerates/collimates the jet and how this is related to accretion; and finally the role of jets, if any, in the formation of both massive stars and brown dwarfs.

I will present the main results of my work and then I will discuss how the analysis of observations acquired with the Submillimeter Array and the Herschel space telescope will allow me to extend the study of jets and protoplanetary disks to the far-infrared and millimeter wavelength ranges.