Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3602r&link_type=abstract
American Astronomical Society, ESS meeting #2, #36.02
Astronomy and Astrophysics
Astronomy
Scientific paper
The discovered extrasolar planets exhibit a huge variety of orbital parameters whereas all planets in our own solar system are on nearly circular orbits with low eccentricities and mutual inclinations.
We present new results on the interaction of proto-planetary discs and planets on extreme orbits (i.e. high inclination and high eccentricity). Both analytic calculations and three dimensional hydrodynamic simulations show interesting effects in an area of the parameter space which hasn't been studied before.
For highly inclined planets (i>H/r), the interaction with the disc is much weaker than for embedded planets and is dominated by dynamical friction. The relevant timescales become comparable to the disc lifetime. Furthermore, the migration timescale might be faster than the inclination damping timescale for low planet masses. This allows the formation of inclined planets even in the presence of a gas disc, as planets will not re-align with the disc.
For embedded, highly eccentric planets (e>H/r) the evolution is also dominated by dynamical friction. The timescales are also long, but depend on the global disc structure in this case. It is possible that eccentric planets created by gravitational instability or planet-planet scattering remain in their orbits even when they are embedded in the disc.
Muto Takayuki
Rein Hanno
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