SPATIALLY RESOLVED MID-INFRARED IMAGING OF THE SR 21 TRANSITION DISK

Journal Article · Sat Jun 20 04:00:00 EDT 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/698/2/L169; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21307733

Eisner, J A ^[1]; Monnier, J D ^[2]; Tuthill, P ^[3]; Lacour, S ^[4]

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1. Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)
2. University of Michigan Astronomy Department, 941 Dennison Building, Ann Arbor, MI 48109 (United States)
3. School of Physics, Sydney University, NSW 2006 (Australia)
4. Observatoire de Paris, F-92195 Meudon (France)

We present mid-infrared (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 {approx}0.5 AU to {approx}20 AU, based on modeling of the observed spectral energy distribution (SED). 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 {approx}10 AU, without the hot inner disk spanning {approx}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.

• OSTI ID: 21307733
• Journal Information: Astrophysical Journal (Online), Journal Name: Astrophysical Journal (Online) Journal Issue: 2 Vol. 698; ISSN 1538-4357
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DUSTS
EMISSION
ENERGY SPECTRA
PROTOPLANETS
STARS