Atmospheric Phase Correction using CARMA-PACS: High Angular Resolution Observations of the FU-Orionis star PP 13S* - Astrophysics > Instrumentation and Methods for AstrophysicsReportar como inadecuado




Atmospheric Phase Correction using CARMA-PACS: High Angular Resolution Observations of the FU-Orionis star PP 13S* - Astrophysics > Instrumentation and Methods for Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We present 0.15- resolution observations of the 227 GHz continuum emissionfrom the circumstellar disk around the FU-Orionis star PP 13S*. The data wereobtained with the Combined Array for Research in Millimeter-wave AstronomyCARMA Paired Antenna Calibration System C-PACS, which measures and correctsthe atmospheric delay fluctuations on the longest baselines of the array inorder to improve the sensitivity and angular resolution of the observations. Adescription of the C-PACS technique and the data reduction procedures arepresented. C-PACS was applied to CARMA observations of PP 13S*, which led to afactor of 1.6 increase in the observed peak flux of the source, a 36% reductionin the noise of the image, and a 52% decrease in the measured size of thesource major axis. The calibrated complex visibilities were fitted with atheoretical disk model to constrain the disk surface density. The total diskmass from the best fit model corresponds to 0.06 \msun, which is larger thanthe median mass of a disk around a classical T Tauri star. The disk isoptically thick at a wavelength of 1.3 mm for orbital radii less than 48 AU. Atlarger radii, the inferred surface density of the PP 13S* disk is an order ofmagnitude lower than that needed to develop a gravitational instability.



Autor: Laura M. Pérez, James W. Lamb, David P. Woody, John M. Carpenter, B. Ashley Zauderer, Andrea Isella, Douglas C. Bock, Alberto D.

Fuente: https://arxiv.org/







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