# A Submillimeter View of Circumstellar Dust Disks in $ρ$ Ophiuchus - Astrophysics

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Abstract: We present new multiwavelength submillimeter continuum measurements of thecircumstellar dust around 48 young stars in the $ho$ Ophiuchus dark clouds.Supplemented with previous 1.3 mm observations of an additional 99 objects fromthe literature, the statistical distributions of disk masses and submillimetercolors are calculated and compared to those in the Taurus-Auriga region. Thesebasic submillimeter properties of young stellar objects in both environmentsare shown to be essentially identical. As with their Taurus counterparts, the$ho$ Oph circumstellar dust properties are shown to evolve along an empiricalevolution sequence based on the infrared spectral energy distribution. Thecombined $ho$ Oph and Taurus Class II samples 173 sources are used to setbenchmark values for basic outer disk characteristics: M disk ~ 0.005 solarmasses, M disk-M star ~ 1%, and $\alpha$ ~ 2 where $F { u} \propto u^{\alpha}$ between 350 microns and 1.3 mm. The precision of these numbersare addressed in the context of substantial solid particle growth in theearliest stages of the planet formation process. There is some circumstantialevidence that disk masses inferred from submillimeter emission may beunder-estimated by up to an order of magnitude.

Autor: Sean M. Andrews, Jonathan P. Williams

Fuente: https://arxiv.org/