Atmospheric phase correction using CARMA-PACS: High angular resolution observations of the FU Orionis star PP 13S

Laura M. Pérez, James W. Lamb, David P. Woody, John M. Carpenter, B. Ashley Zauderer, Andrea Isella, Douglas C. Bock, Alberto D. Bolatto, John Carlstrom, Thomas L. Culverhouse, Marshall Joy, Woojin Kwon, Erik M. Leitch, Daniel P. Marrone, Stephen J. Muchovej, Richard L. Plambeck, Stephen L. Scott, Peter J. Teuben, Melvyn C.H. Wright

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


We present 0′′15 resolution observations of the 227 GHz continuum emission from the circumstellar disk around the FU Orionis star PP 13S*. The data were obtained with the Combined Array for Research in Millimeter-wave Astronomy (CARMA) Paired Antenna Calibration System (C-PACS), which measures and corrects the atmospheric delay fluctuations on the longest baselines of the array in order to improve the sensitivity and angular resolution of the observations. A description of the C-PACS technique and the data reduction procedures are presented. C-PACS was applied to CARMA observations of PP 13S*, which led to a factor of 1.6 increase in the observed peak flux of the source, a 36% reduction in the noise of the image, and a 52% decrease in the measured size of the source major axis. The calibrated complex visibilities were fitted with a theoretical disk model to constrain the disk surface density. The total disk mass from the best-fit model corresponds to 0.06 M, which is larger than the median mass of a disk around a classical T Tauri star. The disk is optically thick at a wavelength of 1.3 mm for orbital radii less than 48 AU. At larger radii, the inferred surface density of the PP 13S* disk is an order of magnitude lower than that needed to develop a gravitational instability.

Original languageEnglish (US)
Pages (from-to)493-501
Number of pages9
JournalAstrophysical Journal
Issue number1
StatePublished - Nov 20 2010


  • Circumstellar matter
  • Stars: pre-main sequence
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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