KINEMATICS of the ENVELOPE and TWO BIPOLAR JETS in the CLASS 0 PROTOSTELLAR SYSTEM L1157

Woojin Kwon, Manuel Fernández-López, Ian W. Stephens, Leslie W. Looney

Research output: Contribution to journalArticlepeer-review

Abstract

A massive envelope and a strong bipolar outflow are the two main structures characterizing the youngest protostellar systems. In order to understand the physical properties of a bipolar outflow and the relationship with those of the envelope, we obtained a mosaic map covering the whole bipolar outflow of the youngest protostellar system L1157 with about 5 angular resolution in CO J = 21 using the Combined Array for Research in Millimeter-wave Astronomy. By utilizing these observations of the whole bipolar outflow, we estimate its physical properties and show that they are consistent with multiple jets. We also constrain a preferred precession direction. In addition, we observed the central envelope structure with 2 resolution in the l = 1.3 and 3 mm continua and various molecular lines: C17O, C18O, 13CO, CS, CN, N2H+, CH3OH, H2O, SO, and SO2. All of the CO isotopes and CS, CN, and N2H+ have been detected and imaged. We marginally detected the features that can be interpreted as a rotating inner envelope in C17O and C18O and as an infalling outer envelope in N2H+. We also estimated the envelope and central protostellar masses and found that the dust-opacity spectral index changes with radius.

Original languageEnglish (US)
Article number43
JournalAstrophysical Journal
Volume814
Issue number1
DOIs
StatePublished - Nov 20 2015

Keywords

  • circumstellar matter
  • stars: formation
  • stars: individual (L1157)
  • stars: pre-main sequence
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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