Evidence for a hot dust-free inner disk around 51 Oph

Details Evidence for a hot dust-free inner disk around 51 Oph Evidence for a hot dust-free inner disk around 51 Oph

2004-12-20

arxiv.org/abs/astro-ph/0412514v1

Astronomy and Astrophysics

Astrophysics

Letter accepted for publication in A&A

Scientific paper

10.1051/0004-6361:200400132

We report on the observation of CO bandhead emission around 51 Oph (dv=2). A high resolving power (R~10,000) spectrum was obtained with the infrared spectrometer ISAAC mounted on VLT-ANTU. Modeling of the profile suggests that the hot (Tgas=2000-4000K) and dense (n_H>1e10 cm-3) molecular material as probed by the CO bandhead is located in the inner AU of a Keplerian disk viewed almost edge-on. Combined with the observation of cooler gas (Tgas=500-900K) by ISO-SWS and the lack of cold material, our data suggest that the disk around 51 Oph is essentially warm and small. We demonstrate the presence of a dust-free inner disk that extents from the inner truncation radius until the dust sublimation radius. The disk around 51 Oph may be in a rare transition state toward a small debris disk object.

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