Spatially Resolved Mid-IR Imaging of the SR 21 Transition Disk

Abstract

We present mid-IR observations from Gemini/TReCS that spatially resolve the dust emission around SR 21. The protoplanetary disk around SR 21 is believed to have a cleared gap extending from stellocentric radii of ~0.5 AU to ~20 AU, based on modeling of the observed spectral energy distribution. Our new observations resolve the dust emission, and our data are inconsistent with the previous model. We require the disk to be completely cleared within ~10 AU, without the hot inner disk spanning ~0.25-0.5 AU posited previously. To fit the SED and mid-IR imaging data together, we propose a disk model with a large inner hole, but with a warm companion--possibly surrounded by circumstellar material of its own--residing near the outer edge of the cleared region. We also discuss a model with a narrow ring included in a large cleared inner disk region, and argue that it is difficult to reconcile with the data.

13 pages, including 3 figures. Accepted for publication by ApJ Letters

References in corpus (10)

• Accretion in the Rho-Oph pre-main sequence stars
• A Submillimeter View of Circumstellar Dust Disks in $\rho$ Ophiuchus
• Photoevaporation of protoplanetary discs I: hydrodynamic models
• Spectro-astrometric imaging of molecular gas within protoplanetary disk gaps
• Demographics of Transition Objects
• The Disk Around CoKu Tau/4: Circumbinary, not Transitional
• An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission
• Pre-main sequence spectroscopic binaries suitable for VLTI observations
• High spatial resolution mid-infrared observations of the low-mass young star TW Hya
• Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA

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