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Issue A&A
Volume 402, Number 1, April IV 2003
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20030369



A&A 402, L5-L8 (2003)
DOI: 10.1051/0004-6361:20030369

Letter

A stream of particles from the $\beta$ Pictoris disc: A possible ejection mechanism

N. A. Krivova and S. K. Solanki

Max-Planck-Institute for Aeronomy, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
    e-mail: solanki@linmpi.mpg.de
(Received 5 September 2002 / Accepted 12 March 2003 )

Abstract
Recently, a stream of particles originating from the direction of $\beta$ Pictoris, a young main sequence star surrounded by a dust disc, has been reported (Baggaley 2000). Standard mechanisms of particle ejection from a disc fail to reproduce the properties of this stream. We find that scattering by a giant proto-planet with properties taken from the literature is consistent with the observations. The fact that a straightforward ejection mechanism reproduces the data supports the identification of the particle stream's source with $\beta$ Pic. Our work also indicates that protoplanetary dust discs form a potentially rich source of large interstellar grains, as widely detected in the Solar System.


Key words: circumstellar matter -- meteors, meteoroids -- planetary systems -- stars: individual: $\beta$ Pic

Offprint request: N. A. Krivova, natalie@linmpi.mpg.de

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© ESO 2003


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