KINEMATICS OF THE ENVELOPE AND TWO BIPOLAR JETS IN THE CLASS 0 PROTOSTELLAR SYSTEM L1157

• Published in: The Astrophysical journal Vol. 814; no. 1; pp. 1 - 17
• Main Authors: Kwon, Woojin, Fernández-López, Manuel, Stephens, Ian W., Looney, Leslie W.
• Format: Journal Article
• Language: English
• Published: United Kingdom The American Astronomical Society 20.11.2015
• Subjects: Arrays; ASTRONOMY; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON MONOXIDE; CARBON NITRIDES; circumstellar matter; COSMIC DUST; CYANIDES; Envelopes; ISOTOPES; Jets; MASS; METHANOL; Outflow; Physical properties; Protostars; Spectra; STARS; stars: formation; stars: individual (L1157); stars: pre-main sequence; SULFUR DIOXIDE; techniques: interferometric
• ISSN: 0004-637X; 1538-4357; 1538-4357
• DOI: 10.1088/0004-637X/814/1/43

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 = 2-1 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 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.