FAUST. II. Discovery of a Secondary Outflow in IRAS 15398−3359: Variability in Outflow Direction during the Earliest Stage of Star Formation? - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2021

FAUST. II. Discovery of a Secondary Outflow in IRAS 15398−3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?

Yuki Okoda
Yoko Oya
Logan Francis
Doug Johnstone
Shu-Ichiro Inutsuka
Cecilia Ceccarelli
Claudio Codella
Claire Chandler
Nami Sakai
Yuri Aikawa
Felipe Alves
Nadia Balucani
Eleonora Bianchi
Mathilde Bouvier
Paola Caselli
Emmanuel Caux
  • Fonction : Auteur
Steven Charnley
  • Fonction : Auteur
Spandan Choudhury
  • Fonction : Auteur
Marta de Simone
Francois Dulieu
  • Fonction : Auteur
Aurora Durán
  • Fonction : Auteur
Lucy Evans
  • Fonction : Auteur
Cécile Favre
  • Fonction : Auteur
Davide Fedele
  • Fonction : Auteur
Siyi Feng
Francesco Fontani
Tetsuya Hama
Tomoyuki Hanawa
Eric Herbst
Tomoya Hirota
Muneaki Imai
Andrea Isella
Izaskun Jímenez-Serra
Claudine Kahane
Bertrand Lefloch
  • Fonction : Auteur
Laurent Loinard
Ana López-Sepulcre
Luke Maud
María José Maureira
Francois Menard
Seyma Mercimek
  • Fonction : Auteur
Anna Miotello
George Moellenbrock
Shoji Mori
Nadia Murillo
  • Fonction : Auteur
Riouhei Nakatani
Hideko Nomura
Yasuhiro Oba
Ross O’donoghue
  • Fonction : Auteur
Satoshi Ohashi
Juan Ospina-Zamudio
  • Fonction : Auteur
Jaime Pineda
Linda Podio
  • Fonction : Auteur
Albert Rimola
Takeshi Sakai
Dominique Segura-Cox
Yancy Shirley
  • Fonction : Auteur
Brian Svoboda
Vianney Taquet
Leonardo Testi
Charlotte Vastel
Serena Viti
Naoki Watanabe
Yoshimasa Watanabe
Arezu Witzel
  • Fonction : Auteur
Ci Xue
Yichen Zhang
Bo Zhao
  • Fonction : Auteur
Satoshi Yamamoto
  • Fonction : Auteur

Résumé

We have observed the very low-mass Class 0 protostar IRAS 15398-3359 at scales ranging from 50 to 1800 au, as part of the Atacama Large Millimeter/Submillimeter Array Large Program FAUST. We uncover a linear feature, visible in H2CO, SO, and C18O line emission, which extends from the source in a direction almost perpendicular to the known active outflow. Molecular line emission from H2CO, SO, SiO, and CH3OH further reveals an arc-like structure connected to the outer end of the linear feature and separated from the protostar, IRAS 15398-3359, by 1200 au. The arc-like structure is blueshifted with respect to the systemic velocity. A velocity gradient of 1.2 km s-1 over 1200 au along the linear feature seen in the H2CO emission connects the protostar and the arc-like structure kinematically. SO, SiO, and CH3OH are known to trace shocks, and we interpret the arc-like structure as a relic shock region produced by an outflow previously launched by IRAS 15398-3359. The velocity gradient along the linear structure can be explained as relic outflow motion. The origins of the newly observed arc-like structure and extended linear feature are discussed in relation to turbulent motions within the protostellar core and episodic accretion events during the earliest stage of protostellar evolution.

Dates et versions

hal-03510964 , version 1 (04-01-2022)

Identifiants

Citer

Yuki Okoda, Yoko Oya, Logan Francis, Doug Johnstone, Shu-Ichiro Inutsuka, et al.. FAUST. II. Discovery of a Secondary Outflow in IRAS 15398−3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?. The Astrophysical Journal, 2021, 910 (1), pp.11. ⟨10.3847/1538-4357/abddb1⟩. ⟨hal-03510964⟩
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