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Wednesday 21 Feb 2024Systematically studying late-stage infall of material onto Class II disks

Aashish Gupta - ESO

Physics building, 4th floor 14:00-15:00

The traditional picture of the star formation process suggests that as a protostar evolves to the Class II stage - i.e., its envelope disperses - a circumstellar disk is left behind that evolves in isolation to form a planetary system. Nevertheless, Class II systems are still in the vicinity of large-scale molecular clouds and may continue to accrete material from them. To systematically study this phenomenon, we demonstrated that the proximity to reflection nebulae could be used as a criterion for identifying Class II sources with streamer-like structures, suggesting late infall. To ascertain the infalling nature of these observed structures and then to quantify their impact on the protostellar systems, we developed the first-of-its-kind code TIPSY (Trajectory of Infalling Particles in Streamers around Young stars). Analysis of streamers around S CrA and HL Tau using TIPSY showed that they are feeding protostellar systems at a rate of > 27 MJupiter Myr-1 and > 5 MJupiter Myr-1, respectively, which can significantly increase the mass budget available to form planets.

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