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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2022

PRODIGE - Envelope to disk with NOEMA

Roberto Neri
D. Semenov
  • Fonction : Auteur
Th. Henning
  • Fonction : Auteur
Anne Dutrey
A. Fuente
  • Fonction : Auteur
S. Guilloteau
T. Hsieh
  • Fonction : Auteur
I. Jiménez-Serra
  • Fonction : Auteur
S. Marino
  • Fonction : Auteur
M. Maureira
  • Fonction : Auteur
G. Smirnov-Pinchukov
  • Fonction : Auteur
M. Tafalla
  • Fonction : Auteur
B. Zhao
  • Fonction : Auteur

Résumé

Context: In the past few years, there has been a rise in the detection of streamers, asymmetric flows of material directed toward the protostellar disk with material from outside a star’s natal core. It is unclear how they affect the process of mass accretion, in particular beyond the Class 0 phase. Aims: We investigate the gas kinematics around Per-emb-50, a Class I source in the crowded star-forming region NGC 1333. Our goal is to study how the mass infall proceeds from envelope to disk scales in this source. Methods: We use new NOEMA 1.3 mm observations, including C 18 O, H 2 CO, and SO, in the context of the PRODIGE MPG – IRAM program, to probe the core and envelope structures toward Per-emb-50. Results: We discover a streamer delivering material toward Per-emb-50 in H 2 CO and C 18 O emission. The streamer’s emission can be well described by the analytic solutions for an infalling parcel of gas along a streamline with conserved angular momentum, both in the image plane and along the line-of-sight velocities. The streamer has a mean infall rate of 1.3 × 10 −6 M ⊙ yr− 1 , five to ten times higher than the current accretion rate of the protostar. SO and SO 2 emission reveal asymmetric infall motions in the inner envelope, additional to the streamer around Per-emb-50. Furthermore, the presence of SO 2 could mark the impact zone of the infalling material. Conclusions: The streamer delivers sufficient mass to sustain the protostellar accretion rate and might produce an accretion burst, which would explain the protostar’s high luminosity with respect to other Class I sources. Our results highlight the importance of late infall for protostellar evolution: streamers might provide a significant amount of mass for stellar accretion after the Class 0 phase.
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Dates et versions

hal-04658937 , version 1 (22-07-2024)

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M. Valdivia-Mena, J. Pineda, D. Segura-Cox, P. Caselli, Roberto Neri, et al.. PRODIGE - Envelope to disk with NOEMA: I. A 3000 au streamer feeding a Class I protostar. Astronomy and Astrophysics - A&A, 2022, 667, pp.A12. ⟨10.1051/0004-6361/202243310⟩. ⟨hal-04658937⟩
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