Banzatti, A. and Testi, L. and Isella, A. and Natta, A. and Neri, R. and Wilner, D. J. (2011) New constraints on dust grain size and distribution in CQ Tauri. Astronomy and Astrophysics, 525 . Art. No. A12. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20110124-093019305
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Context. Grain growth in circumstellar disks is expected to be the first step towards the formation of planetary systems. There is now evidence for grain growth in several disks around young stars. Aims. Radially resolved images of grain growth in circumstellar disks are believed to be a powerful tool to constrain the dust evolution models and the initial stage for the formation of planets. In this paper we attempt to provide these constraints for the disk surrounding the young star CQ Tau. This system was already suggested from previous studies to host a population of grains grown to large sizes. Methods. We present new high angular resolution (0".3−0".9) observations at wavelengths from 850 μm to 3.6 cm obtained at the SMA, IRAM-PdBI and NRAO-VLA interferometers. We perform a combined analysis of the spectral energy distribution and of the high-resolution images at different wavelengths using a model to describe the dust thermal emission from the circumstellar disk. We include a prescription for the gas emission from the inner regions of the system. Results. We detect the presence of evolved dust by constraining the disk averaged dust opacity coefficient β (computed between 1.3 and 7 mm) to be 0.6 ± 0.1. This confirms the earlier suggestions that the disk contains dust grains grown to significant sizes and puts this on firmer grounds by tightly constraining the gas contamination to the observed fluxes at mm-cm wavelengths. We report some evidence of radial variations in dust properties, but current resolution and sensitivity are still too low for definitive results.
|Additional Information:||© 2010 ESO. Received 13 June 2010, Accepted 3 September 2010, Published online 26 November 2010. We thank Luca Ricci for his help in computing the dust opacities and for many useful discussions on grain growth in protoplanetary disks. All the observations used in this paper were taken in service mode by the observatories staff at SMA, IRAM and NRAO, their excellent support is gratefully acknowledged. LT and AN were partly supported by the grant ASI COFIS I/016/07/0. This work was performed in part under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Michelson Fellowship Program. JPL is managed for NASA by the California Institute of Technology. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.|
|Subject Keywords:||protoplanetary disks – dust, extinction – circumstellar matter – stars: individual: CQ Tauri|
|Official Citation:||New constraints on dust grain size and distribution in CQ Tauri A. Banzatti, L. Testi, A. Isella, A. Natta, R. Neri and D. J. Wilner A&A 525 A12 (2011) DOI: 10.1051/0004-6361/201015206|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||24 Jan 2011 17:50|
|Last Modified:||26 Dec 2012 12:51|
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