GEOMETRIC and KINEMATIC STRUCTURE of the OUTFLOW/ENVELOPE SYSTEM of L1527 REVEALED by SUBARCSECOND-RESOLUTION OBSERVATION of CS

Yoko Oya, Nami Sakai, Bertrand Lefloch, Ana López-Sepulcre, Yoshimasa Watanabe, Cecilia Ceccarelli, Satoshi Yamamoto

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Subarcsecond-resolution images of the rotational line emissions of CS and c-C3H2 obtained toward the low-mass protostar IRAS 04368+2557 in L1527 with the Atacama Large Millimeter/submillimeter Array are investigated to constrain the orientation of the outflow/envelope system. The distribution of CS consists of an envelope component extending from north to south and a faint butterfly shaped outflow component. The kinematic structure of the envelope is well reproduced by a simple ballistic model of an infalling rotating envelope. Although the envelope has a nearly edge-on configuration, we find that the western side of the envelope faces the observer. This configuration is opposite to the direction of the large-scale (∼104 AU) outflow suggested previously from the 12CO (J = 3-2) observation, and to the morphology of infrared reflection near the protostar (∼200 AU). The latter discrepancy could originate from high extinction by the outflow cavity of the western side, or may indicate that the outflow axis is not parallel to the rotation axis of the envelope. Position-velocity diagrams show the accelerated outflow cavity wall, and its kinematic structure in the 2000 AU scale is explained by a standard parabolic model with the inclination angle derived from the analysis of the envelope. The different orientation of the outflow between the small and large scale implies a possibility of precession of the outflow axis. The shape and the velocity of the outflow in the vicinity of the protostar are compared with those of other protostars.

Original languageEnglish
Article number59
JournalAstrophysical Journal
Volume812
Issue number1
DOIs
Publication statusPublished - 2015 Oct 10
Externally publishedYes

Keywords

  • ISM: individual objects (L1527)
  • ISM: molecules
  • stars: formation
  • stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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