Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..347k&link_type=abstract
Astronomy and Astrophysics, v.409, p.347-359 (2003)
Astronomy and Astrophysics
Astrophysics
8
Stars: Individual: Beta Pic, Methods: Numerical, Comets: General, Stars: Circumstellar Matter, Stars: Planetary Systems: Formation
Scientific paper
Transient spectral redshifted absorption events in the spectrum of beta Pictoris (beta Pic) have been attributed to comet-like bodies falling toward the star (Falling Evaporating Bodies, or FEB) and evaporating in its immediate vicinity. Dynamical models shows that these bodies originate from circular orbits at ga 4 AU. After an eccentricity increase due to planetary perturbations, they end up as star-grazers. The physics of the cloud generated by the body's sublimation is highly influenced by the physico-chemical conditions inside the body. Thus it is necessary to investigate the composition and the behavior of the materials within the body in order to explain the observed features. The physico-chemical evolution of the bodies has been simulated during all the phases before and during their FEB state. First the fluctuations in the gas production rates of volatile solids in the first phase when the refractory materials have not yet evaporated has been studied. Later on, the refractory crust of the object evaporates even if the core still contains volatile solids. The simulation then shows a phase lag between the production rate of volatiles and of refractory materials during the periastron passage. The influence of dynamical and physical parameters on the FEB phenomenon are also investigated. We find that only a heterogenous population of bodies can produce all the absorption features that have been observed so far. These results are important for the understanding of the FEB phenomenon and can lead to a revision of the FEB sublimation model.
Beust Hervé
Karmann C.
Klinger Jurgen
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