Spectropolarimetry of the 3 Micron Ice Feature toward the Becklin-Neugebauer Object

Details Spectropolarimetry of the 3 Micron Ice Feature toward the Becklin-Neugebauer Object Spectropolarimetry of the 3 Micron Ice Feature toward the Becklin-Neugebauer Object

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461..902h&link_type=abstract

Astrophysical Journal v.461, p.902

Astronomy and Astrophysics

Astronomy

28

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Individual Alphanumeric: Omc-1, Polarization

Scientific paper

We present spectropolarimetry of the 3.1 μm water-ice feature in the Becklin-Neugebauer (BN) object in OMC-1, with spectral resolution and signal-to-noise ratios substantially improved over previous observations. The well-known increase in polarization within the ice feature is interpreted in terms of a model for aligned graphite and silicate grains with ice mantles. We identify polarization structure in the long-wavelength (3.3-3.6 μm) wing of the ice profile, including a feature at 3.47 μm which matches closely the spectroscopic feature discovered in several protostars and attributed to carbonaceous material with diamond-like structure. We also show, for the first time, the occurrence of a systematic variation in the position angle of polarization across the ice feature in BN, indicating systematic differences in the relative numbers of core-mantle and unmantled grains along the line of sight, and a twist in the magnetic field orientation.

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