Streamers feeding the SVS13-A protobinary system: astrochemistry reveals accretion shocks?

Abstract

We report ALMA high-angular resolution (~ 50 au) observations of the binary system SVS13-A. More specifically, we analyse deuterated water (HDO) and sulfur dioxide (SO2) emission. The molecular emission is associated with both the components of the binary system, VLA4A and VLA4B. The spatial distribution is compared to that of formamide (NH2CHO), previously analysed in the system. Deuterated water reveals an additional emitting component spatially coincident with the dust accretion streamer, at a distance larger than 120 au from the protostars, and at blue-shifted velocities (> 3 km/s from the systemic velocities). We investigate the origin of the molecular emission in the streamer, in light of thermal sublimation temperatures calculated using updated binding energies (BE) distributions. We propose that the observed emission is produced by an accretion shock at the interface between the accretion streamer and the disk of VLA4A. Thermal desorption is not completely excluded in case the source is actively experiencing an accretion burst.

Accepted for publication in Faraday Discussions 2023

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Cited by in corpus (4)

• FAUST XVII: Super deuteration in the planet forming system IRS 63 where the streamer strikes the disk
• Accuracy of ALMA estimates of young disk radii and masses. Predicted observations from numerical simulations
• An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
• FAUST XV. A disk wind mapped by CH${}_3$OH and SiO in the inner 300 au of the NGC 1333 IRAS 4A2 protostar