Abstract

Contributed Talk - Splinter StarFormation   (MW-1250)

The First Chemical Inventory of a Streamer: A Case Study of B5-IRS1

Yu-Ru Chou (1), Jaime E. Pineda (1), and the PRODIGE team
1: Max-Planck-Institut für extraterrestrische Physik

Streamers are asymmetric material channels that accrete onto young disks, frequently observed during the early stages of star formation. However, streamer chemistry has been poorly explored, even though it may affect subsequent planetary chemistry. We aim to present the first chemical inventory of a streamer and to assess how chemically unique it is. We used NOEMA and IRAM 30m observations from the PRODIGE and ANTIHEROS large programs to target species containing carbon, oxygen, sulfur, nitrogen, and deuterium around the Class I protostar B5-IRS1. We confirmed streamer tracers using morphological and kinematic analyses and compared streamer abundances with those of the associated envelope and disk. The chemical inventory of the B5-IRS1 streamer includes H2CO, c-C3H2, DCN, DCO+, and C18O, with c-C3H2 identified as the most effective tracer of the streamer. The observed abundances of DCN and DCO+ indicate that these species likely formed within the host filament of B5-IRS1 and were subsequently transported to the star/disk system via the streamer. We found chemical stratification within the streamer, which can be attributed to density variations along its structure. This work provides the first chemical inventory of a streamer and shows that a streamer can be chemically connected to its host filament. Our findings establish a benchmark for future statistical and comparative analyses on streamer chemistry.