The magnetic field morphology of the class 0 protostar L1157-mm

Ian W. Stephens, Leslie W. Looney, Woojin Kwon, Charles L.H. Hull, Richard L. Plambeck, Richard M. Crutcher, Nicholas Chapman, Giles Novak, Jacqueline Davidson, John E. Vaillancourt, Hiroko Shinnaga, Tristan Matthews

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

We present the first detection of polarization around the Class 0 low-mass protostar L1157-mm at two different wavelengths. We show polarimetric maps at large scales (10″ resolution at 350 μm) from the SHARC-II Polarimeter and at smaller scales (1.″2-4.″5 at 1.3 mm) from the Combined Array for Research in Millimeter-wave Astronomy (CARMA). The observations are consistent with each other and show inferred magnetic field lines aligned with the outflow. The CARMA observations suggest a full hourglass magnetic field morphology centered about the core; this is only the second well-defined hourglass detected around a low-mass protostar to date. We apply two different methods to CARMA polarimetric observations to estimate the plane-of-sky magnetic field magnitude, finding values of 1.4 and 3.4 mG.

Original languageEnglish (US)
Article numberL15
JournalAstrophysical Journal Letters
Volume769
Issue number1
DOIs
StatePublished - May 20 2013

Keywords

  • galaxies: star formation
  • magnetic fields
  • polarization
  • stars: protostars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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