A flattened protostellar envelope in absorption around L1157

Leslie W. Looney, John J. Tobin, Woojin Kwon

Research output: Contribution to journalArticlepeer-review


Deep Spitzer IRAC images of L1157 reveal many of the details of the outflow and the circumstellar environment of this Class 0 protostar. In IRAC channel 4 (8 μm), there is a flattened structure seen in absorption against the background emission. The structure is perpendicular to the outflow and is extended to a diameter of ∼2′. This structure is the first clear detection of a flattened circumstellar envelope or pseudodisk around a Class 0 protostar. Such a flattened morphology is an expected outcome for many collapse theories that include magnetic fields or rotation. We construct an extinction model for a power-law density profile, but we do not constrain the density power-law index.

Original languageEnglish (US)
Pages (from-to)L139-L142
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2007


  • Circumstellar matter
  • Stars: formation
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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