|Abstract : || |
The crucial problem in star formation appears as the circumstellar disk transports away the angular momentum from the collapsing core and prevents material to accrete at the central source. Previous observations reveal that outflows and jets could efficiently remove the excess angular momentum from the disk and allow material to fall into the central source. Thus, jets and outflows are intriguing sign spots of star formation and trace the accretion history of protostars. However, it is unclear from the observational point of view at what stage of star formation and from which part of the circumstellar disk the jet launches. How does the chemical composition of the shock in the jet evolve with time?
In this talk, I shall discuss the properties of the jets and outflows observed in protostars based on our recent observations with the Atacama Large Millimeter/submillimeter Array (ALMA). In particular, (i) when outflows/jets are launched, (ii) how the outflows/jets evolve chemically with time, (iii) how they are correlated to accretion and ejection rate (iv) how frequent the episodic accretion/ejection occurs. Finally, I shall try to provide links between the high-resolution ALMA observations with the low/medium-resolution near-infrared spectroscopy and time-series photometric observations from Indian nation facility telescopes.
|About Speaker : || |
Dr. SOMNATH DUTTA is a post-doctoral fellow at Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), Taiwan. He obtained his Ph.D. from S. N. Bose National Centre for Basic Sciences, Kolkata, India (2012-2017). He is interested in the formation and evolution of sun-like stars.