Dublin Institute for Advanced Studies contact@dias.ie 00353 (0) 16140100

2020-05-19, 15:00: Prof. H. Arce (Yale University)

Prof. Héctor Arce

Yale University, USA

Feedback from young stars and its impact over a wide rage of scales – from molecular clouds to protoplanetary disks.

Abstract: Star formation is a multi-scale process. Star-forming clouds in our galaxy have sizes of a few tens of parsecs. Dense condensations within clouds, where individual (or groups of) stars form, are smaller by more than two orders of magnitude. Circumstellar envelopes and disks are even smaller. Similarly, stellar winds and outflows impact the star formation environment over a wide range of scales —-as they originate close to the surface of the forming star and may reach linear sizes of a few parsecs. Thus, a complete picture of the star formation process requires understanding the gas structure and kinematics over a wide range of scales. I will present new interferometer (sub)millimeter data (from ALMA, CARMA and SMA) that have allow us to study the star formation environment at superb resolution, from scales of giant molecular clouds (~10pc) down to the scales of circumstellar envelopes and disks (~100AU). I will discuss the importance and the effects of outflows and winds on the star formation process and show recent results on the impact of stellar feedback on circumstellar disks and envelopes, and its effect on the core (and cloud) star formation efficiency. I will also show how outflows help us detect protostars and how they can tell us about the mass accretion history of forming stars.