Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.1002n&link_type=abstract
American Astronomical Society, ESS meeting #2, #10.02
Other
Scientific paper
Boley, Nayakshin and others have recently suggested that young massive gaseous proto-planets migrate faster than they contract and are therefore tidally disrupted. The disruption may "downside" the planets into Neptunes or Earth-sized planets. However, this potentially interesting scenario for planet formation has not yet been detailed.
We present detailed calculations that may shed unbiased light on the utility of these ideas. In particular, we (Nayakshin and Lodato, in prep.) model numerically the viscous gas disc evolution together with the radial migration of the giant gaseous planet embedded in the disc. The planet typically fills its Roche lobe at the planet-star separation of about 0.05 to 0.1 AU. The material overflowing the Roche lobe is deposited in the disc interior of the planet, which fuels a major protostellar accretion outburst rising on the time-scales of years.
The result of the planet's disruption depends on the radius-mass relation for the planet and whether the gap in the disc remains opened or not. If planet does not expand as it looses mass, or does so slowly, then there is a quasi-steady regime. This regime is well known from stellar binaries. The secondary (the planet here) looses mass to the primary and moves OUTWARD due to the conservation of angular momentum (overpowering the outer disc torques).
When the gap is partially closed, the planet's steady-state outward migration< falters, and the gaseous envelope can be destroyed very rapidly. Only solid cores survive such disruptions. However, if the partially disrupted giant contracts faster than it migrates, the result is a solid core surrounded by
smaller (than the original) gaseous envelope, e.g. Neptune or Saturn-type planets. We plan to include detailed theoretical planet models (a la Baraffe et al) for detailed comparisons of our calculations with observations of "hot" exoplanets and the FU Ori outburst lightcurves.
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