Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Production of star-grazing and impacting planetesimals via orbital
  migration of extrasolar planets : Stellar metallicity enhancement in young
  extrasolar planetary systems   During orbital migration of a giant extrasolar planet via ejection of
planetesimals (Murray et al.~1998), inner mean motion resonances can be strong
enough to cause planetesimals to graze or impact the star. We integrate
numerically the motions of particles which pass through the 3:1 or 4:1 mean
motion resonances of a migrating Jupiter mass planet. We find that many
particles can be trapped in the 3:1 or 4:1 resonances and pumped to high enough
eccentricities that they impact the star. This implies that for a planet
migrating a substantial fraction of its semi major axis, a significant fraction
of its mass in planetesimals could impact the star. This process may be capable
of enriching the metallicity of the star, and at a time when the star is no
longer fully convective. Upon close approaches to the star the surfaces of
these planetesimals will be sublimated. Orbital migration should cause
continuing production of evaporating bodies, suggesting that this process
should be detectable with searches for transient absorption lines in young
stars. The remainder of the particles will not impact the star but can be
subsequently ejected by the planet as it migrates further inwards. This allows
the planet to migrate a substantial fraction of its initial semi-major axis via
ejection of planetesimals.

16
The categories of this paper are: stat
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph