Modeling Spitzer observations of VV Ser. I. The circumstellar disk of a UX Orionis star

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dc.creatorPontoppidan, Klaus M.
dc.creatorDullemond, Cornelis P.
dc.creatorBlake, Geoffrey A.
dc.creatorBoogert, A. C. Adwin
dc.creatorvan Dishoeck, Ewine F.
dc.creatorEvans, Neal J.
dc.creatorKessler-Silacci, Jacqueline
dc.creatorLahuis, Fred
dc.date2006-10-12
dc.date.accessioned2026-07-07T10:40:28Z
dc.date.available2026-07-07T10:40:28Z
dc.descriptionWe present mid-infrared Spitzer-IRS spectra of the well-known UX Orionis star VV Ser. We combine the Spitzer data with interferometric and spectroscopic data from the literature covering UV to submillimeter wavelengths. The full set of data are modeled by a two-dimensional axisymmetric Monte Carlo radiative transfer code. The model is used to test the prediction of (Dullemond et al. 2003) that disks around UX Orionis stars must have a self-shadowed shape, and that these disks are seen nearly edge-on, looking just over the edge of a puffed-up inner rim, formed roughly at the dust sublimation radius. We find that a single, relatively simple model is consistent with all the available observational constraints spanning 4 orders of magnitude in wavelength and spatial scales, providing strong support for this interpretation of UX Orionis stars. The grains in the upper layers of the puffed-up inner rim must be small (0.01-0.4 micron) to reproduce the colors (R_V ~ 3.6) of the extinction events, while the shape and strength of the mid-infrared silicate emission features indicate that grains in the outer disk (> 1-2 AU) are somewhat larger (0.3-3.0 micron). From the model fit, the location of the puffed-up inner rim is estimated to be at a dust temperature of 1500 K or at 0.7-0.8 AU for small grains. This is almost twice the rim radius estimated from near-infrared interferometry. A best fitting model for the inner rim in which large grains in the disk mid-plane reach to within 0.25 AU of the star, while small grains in the disk surface create a puffed-up inner rim at ~0.7-0.8 AU, is able to reproduce all the data, including the near-infrared visibilities. [Abstract abridged]
dc.description12 pages, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0610384
dc.identifierhttp://arxiv.org/abs/astro-ph/0610384
dc.identifierAstrophys.J.656:980-990,2007
dc.identifierdoi:10.1086/510570
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181347
dc.subjectAstrophysics
dc.titleModeling Spitzer observations of VV Ser. I. The circumstellar disk of a UX Orionis star
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