A protostellar system fed by a streamer of 10,500 au length
Jaime E. Pineda (1), Dominique Segura-Cox (1), Paola Caselli (1),, Nichol Cunningham (2), Bo Zhao (1), Anika Schmiedeke (1), Maria Jos\'e, Maureira (1), Roberto Neri (2) ((1) Max-Planck-Institut f\"ur, extraterrestrische Physik (MPE), Gie{\ss}enbachstr. 1, D-85748 Garching,

TL;DR
This study reports the first observation of a large-scale streamer connecting a dense core to a young protostellar disk, highlighting the role of environmental inflows in early disk formation.
Contribution
It introduces the discovery of a 10,500 au streamer feeding a protostellar system, emphasizing the significance of large-scale accretion flows in early star and disk formation.
Findings
Detected a large-scale streamer (>10,500 au) connecting core to disk.
Streamer composed of chemically fresh material, indicating recent accretion.
Suggests large-scale inflows influence early disk evolution.
Abstract
Binary formation is an important aspect of star formation. One possible route for close-in binary formation is disk fragmentation. Recent observations show small scale asymmetries (<300 au) around young protostars, although not always resolving the circumbinary disk, are linked to disk phenomena. In later stages, resolved circumbinary disk observations (<200 au) show similar asymmetries, suggesting the origin of the asymmetries arises from binary-disk interactions. We observed one of the youngest systems to study the connection between disk and dense core. We find for the first time a bright and clear streamer in chemically fresh material (Carbon-chain species) that originates from outside the dense core (>10,500 au). This material connects the outer dense core with the region where asymmetries arise near disk scales. This new…
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