Water Ice in the Disk around the Protostar AFGL 2136 IRS 1

Details Water Ice in the Disk around the Protostar AFGL 2136 IRS 1 Water Ice in the Disk around the Protostar AFGL 2136 IRS 1

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466l.103k&link_type=abstract

Astrophysical Journal Letters v.466, p.L103

Astronomy and Astrophysics

Astronomy

9

Stars: Circumstellar Matter, Ism: Individual Alphanumeric: Afgl 2136, Stars: Formation, Ism: Jets And Outflows, Ism: Molecules, Ism: Reflection Nebulae

Scientific paper

The protostar AFGL 2136 IRS 1 illuminates the Juggler nebula and drives a massive molecular outflow. The line of sight toward AFGL 2136 also displays a rich spectrum of solid state absorption features. To investigate the distribution of ice-coated grains in the environment of IRS 1, we obtained narrowband images at six near-infrared wavelengths surrounding and including the 3.08 mu m water ice feature. These images (specifically, a color map constructed from 2.14 and 3.60 mu m images) provide vivid evidence for the presence of a disk around IRS 1 and appear to reveal, for the first time, the detailed distribution of water ice in the local environment of a protostar. Models of the 2--4 mu m spectral energy distributions (SEDs) toward IRS 1 and the Juggler nebula suggest that the abundance of icy grains is larger along lines of sight through the disk than along lines of sight away from the equatorial plane of IRS 1. Thus, while we find evidence that icy grains exist throughout the cloud core containing AFGL 2136, it appears that the physical conditions in the circumstellar disk around IRS 1 are more conducive to ice mantle survival and/or growth than are physical conditions in its rarefied polar regions.

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