Radio continuum observations of Class I protostellar disks in Taurus: constraining the greybody tail at centimetre wavelengths

Abstract

We present deep 1.8 cm (16 GHz) radio continuum imaging of seven young stellar objects in the Taurus molecular cloud. These objects have previously been extensively studied in the sub-mm to NIR range and their SEDs modelled to provide reliable physical and geometrical parametres.We use this new data to constrain the properties of the long-wavelength tail of the greybody spectrum, which is expected to be dominated by emission from large dust grains in the protostellar disk. We find spectra consistent with the opacity indices expected for such a population, with an average opacity index of beta = 0.26+/-0.22 indicating grain growth within the disks. We use spectra fitted jointly to radio and sub-mm data to separate the contributions from thermal dust and radio emission at 1.8 cm and derive disk masses directly from the cm-wave dust contribution. We find that disk masses derived from these flux densities under assumptions consistent with the literature are systematically higher than those calculated from sub-mm data, and meet the criteria for giant planet formation in a number of cases.

submitted MNRAS

References in corpus (8)

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• Observational Constraints on Submillimeter Dust Opacity
• The Detection and Characterization of cm Radio Continuum Emission from the Low-mass Protostar L1014-IRS
• AMI limits on 15 GHz excess emission in northern HII regions
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• The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). III. Extended Radio Emission from Protostars in Perseus
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• A LOFAR detection of the low mass young star T Tau at 149 MHz
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• A GMRT survey of regions towards the Taurus Molecular Cloud at 323 and 608 MHz
• The long wavelength view of GG Tau A: Rocks in the Ring World
• Modeling Hadronic Gamma-ray Emissions from Solar Flares and Prospects for Detecting Non-thermal Signatures from Protostars
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