Jeans Collapse of a System of Electron Emitting Dust Particles

Details Jeans Collapse of a System of Electron Emitting Dust Particles Jeans Collapse of a System of Electron Emitting Dust Particles

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..aprw10010d&link_type=abstract

American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #W10.010

Astronomy and Astrophysics

Astrophysics

Scientific paper

The collapse of a molecular cloud to form a planetary system is a classic process in astrophysics. The length scale of the collapsed system and the rate of its formation is described in the simplest model by the Jeans instability. When the model is complicated by additional processes, the rate and scale of the Jeans instability is modified [1]. We focus on the processes involved with the charging of the dust in the initial cloud. The presence of charge of the same sign on the dust particles inhibits the process of collapse. Yet, the process of charging is expected to be operational. We propose a mechanism that can explain this apparent contradiction. In a recent work [2], we have shown that in presence of electron emission from the dust the interaction potential of a dust particle becomes similar to the Lennard-Jones (LJ) potential. The important consequence of this discovery is that emitting dust particles with LJ like potential can actually attract each other even though they all share the same sign of charge. Here, we present a series of simulations conducted with a new code designed to study a large system of weakly coupled dust particles, interacting with a LJ like potential. [1] P. K. Shukla, Dust plasma interaction in space, Nova Science Publ., 2002. [2] G.L. Delzanno, G. Lapenta, M. Rosenberg, Phys. Rev. Lett., to appear.

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