On the HR 4796A circumstellar disk

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dc.creatorAugereau, J. C.
dc.creatorLagrange, A. M.
dc.creatorMouillet, D.
dc.creatorPapaloizou, J. C. B.
dc.creatorGrorod, P. A.
dc.date1999-06-26
dc.date.accessioned2026-07-07T02:32:12Z
dc.date.available2026-07-07T02:32:12Z
dc.descriptionWe investigate in details the properties of the disk surrounding the 8 Myr old star HR 4796A, one of the few stars bringing precious clues to better understand the scenario which lead to planetary system formation. We propose a model able to reproduce all the available observations : the full spectral energy distribution from the mid-infrared to the millimeter wavelengths, resolved scattered light and thermal emission observations. We show that the circumstellar matter splits into two dust components : a cold annulus, peaked at 70 AU from the star, made of ISM-like grains (amorphous composition, porosity ~ 0.6) larger than 10 microns and a population of hot dust close to the star (at about 9 AU) made of comet-like grains (crystalline composition, porosity ~ 0.97). Both dust populations are highly collisional and the grain size distribution in the cold annulus is found to be cut-off by radiation pressure. At 70 AU, bodies as large as a few meters are required to fit the data leading to a minimum disk mass of a few Earth masses and to a gas to dust ratio less than 1. We discuss aftewards some implications on the disk structure and effects of larger bodies.
dc.description13 pages, accepted by Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9906429
dc.identifierhttp://arxiv.org/abs/astro-ph/9906429
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14422
dc.subjectAstrophysics
dc.titleOn the HR 4796A circumstellar disk
dc.typetext

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