A New Mechanism to Form Dusty/Asteroidal Rings Around Planets: The Capture of Particles Into Inner Resonances

Details A New Mechanism to Form Dusty/Asteroidal Rings Around Planets: The Capture of Particles Into Inner Resonances A New Mechanism to Form Dusty/Asteroidal Rings Around Planets: The Capture of Particles Into Inner Resonances

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19311603g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #116.03; Bulletin of the American Astronomical Society, Vol. 30, p.1423

Astronomy and Astrophysics

Astronomy

Scientific paper

Using numerical experiments, we have shown that particles can be captured into inner resonances if the planet experiences a negative drift (da/dtpl<0). An alternative possible mechanism is an ourward drift of particles (da/dtpart>0) considered by Hamilton (1994). Both mechanisms are able to produce dusty ring structures located in the inner resonances. The outward particle's drift mechanism is realized whenever there is a strong stellar wind. As a result, a dusty ring similar to an outer resonant ring around Earth, seen by COBE and IRAS but located in the inner resonances and stretched along the planetary orbit, might form. The planetary inward drift mechanism operates if the planet experiences a strong interaction with outer planets or outer disk. (In the Solar system, such negative drift is exemplified by Jupiter.) As a result, not just dust might me captured into the inner resonances (which happens when the outward drift of particles dominates) but asteroids and minor planets as well. As many of the recently found extra-solar `Jupiters' are located rather close to the parent star (e.g. Marcy & Butler 1998), we could expect at least some of them possessing a small planet or/and an inner asteroid belt. Those asteroids would be a source of dust for producing the inner ring structures. We provide numerical results for ring structures in the inner resonances. This work has been supported by NASA Grant NAG5-7065 to George Mason University. References: Hamilton, D.P. 1994, Icarus, 109, 221 Marcy, G.W. & Butler, R.P. 1998, Ann. Rev. Astr. Ap. (in press)

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