Near-infrared polarization images of the Orion proplyds

Details Near-infrared polarization images of the Orion proplyds Near-infrared polarization images of the Orion proplyds

2008-05-05

arxiv.org/abs/0805.0605v1

Astronomy and Astrophysics

Astrophysics

10 pages, 11 figures, 4 online figures

Scientific paper

10.1051/0004-6361:20077555

We performed AO-assisted high-resolution imaging polarimetry on selected Orion proplyds close to the Trapezium stars in the J, H, and K bands. Differential polarimetric images of one of the largest and brightest proplyds are interpreted using 3D radiation transfer simulations based on the Monte Carlo method. Although not fully resolvable by ground-based observations, the circumstellar material can be mapped with polarimetry. We present constraints on the disk parameters of the giant proplyd 177-341. We tested whether dust models with different grain size distributions could explain the observed extent of the polarization patterns and find that simple models with larger grains will not reproduce the spectral polarization behavior. The technique of polarimetric differential imaging (PDI) in the NIR provides a good opportunity to study the structure of the Orion proplyds.

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