Imaging Polarimetry of Young Stellar Objects with ACS and NICMOS: A Study in Dust Grain Evolution

Details Imaging Polarimetry of Young Stellar Objects with ACS and NICMOS: A Study in Dust Grain Evolution Imaging Polarimetry of Young Stellar Objects with ACS and NICMOS: A Study in Dust Grain Evolution

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542932r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #429.32; Bulletin of the American Astronomical Society, Vol. 42, p.355

Astronomy and Astrophysics

Astronomy

Scientific paper

Understanding the early formation of planetary systems is closely linked to understanding how the ISM dust grain population changes as it evolves to planetesimals in young circumstellar disks. Therefore, we have obtained Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and Advanced Camera for Surveys (ACS) polarimetric observations of Class I-III young stellar objects (YSOs) to enable us to study the evolution of the dust grain population in the early phases of star formation. We will present models of four of our program objects - IRAS04302+2247, IRAS04016+2610, CoKuTau1 and DGTauB, based on comparison of the observed polarization maps and the predicted polarization using the radiation transfer models of Whitney et al. (2003 and references therein). We are testing for the dust grain distribution during the initial phases of dust grain growth as a function of evolutionary state. Data and model comparisons of these four YSOs, provide insight into the size and shape of the dust grain distribution within their circumstellar disks during the transition from a disk+envelope system to a disk+star system. Data and model comparisons of YSO intensity and fractional polarization are presented, along with the dust grain distribution that provides the best model fit to the observational data.

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