The β pictoris circumstellar disk XXV: the ca ii absorption lines and the falling evaporating bodies model revisited using UHRF observations

Beust, H. and Lagrange, A.-M. and Crawford, Ian and Goudard, C. and Spyromilio, J. and Vidal-Madjar, A. (1998) The β pictoris circumstellar disk XXV: the ca ii absorption lines and the falling evaporating bodies model revisited using UHRF observations. Astronomy & Astrophysics 338 (3), pp. 1015-1030. ISSN 0004-6361.

Abstract

We present here ultra high resolution observations of the Ca ii K and H lines towards β Pictoris recorded over a period of 3 years and a smaller set of calcium triplet data. At the present resolution, the central Ca ii circumstellar absorption is complex, with several variable components, some of them at very low velocity shifts (< 10 km s−1) with respect to the star, in addition to a very narrow stable component. The stable component is analyzed and physical informations are derived. The variable components at low redshifts are analyzed, and well modeled in the framework of the Falling Evaporating Bodies (FEB) scenario previously invoked to explain the absorption features observed at higher redshifts. We show that the very low redshift events are well simulated by FEBs crossing the line of sight at somewhat larger distances from the star than those responsible for the higher velocity redshift events. The implications of these new observations on the dynamical process responsible for the FEB phenomenon are discussed. In particular, they put strong constraints on the orbital parameters of the incoming bodies that appear in fact in perfect agreement with an origin based on mean-motion resonances with a massive planet.

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