[Baps] 2 planetary talks this week: Garrick-Bethell and Lin

[Sarah Stewart-Mukhopadhyay]

*TUESDAY, FEBRUARY 12 - EPS*
*2:00 PM *
"Some recent paleomagnetic, geologic, and geophysical insights into impact
cratering in the solar system."

Ian Garrick-Bethell, MIT

EPS Faculty Lounge, 4th floor, Hoffman Laboratory, 20 Oxford Street

*
*

*THURSDAY, FEBRUARY 14 - CfA*

*11:00 am:* Institute for Theory and Computation (ITC)
Colloquium<http://www.cfa.harvard.edu/itc/events/thu.htm>.


"Gas Giants and Rocky Planets Around G and M Dwarfs"

Dr. Doug Lin, University of California, Santa Cruz.

Pratt Conference Room, 60 Garden St., CfA

*Abstract:* Outstanding issues in the sequential accretion scenario for gas
giant planet formation include, 1) the retention of dust grains in the
presence of gas drag and that of cores despite type I migration, 2) time
scale for gas giant formation, 3) halting migration at stellar proximity,
and 4) the structural and dynamical diversities. In these context, we
investigate the influence of the snow line and other transition regions in
MRI induced turbulent protostellar disks and show that they naturally
provide retention barriers for planetary building blocks. We also examine
the role of protoplanetary disks in speeding up the gas giant formation
process and the dynamical consequences of rapidly emerging gas giant
planets. We present planetary population synthesis which reproduce the
observed distribution of extra solar gas giants. Radial velocity and transit
surveys will soon be able to detect Earth-mass rocky planets close to G and
M main-sequence dwarf stars. There are many several avenues through which
such planets may be formed. Although rocky planets may be formed in situ
from the grains which migrated to the stellar proximity, their mass is
likely to be severely limited by dynamical isolation. More massive rocky
planets can form near the snow line barrier and migrate to their proximity
of their stars with or without the presence of gas giant planets. Their
statistical properties will provide a caliberation on the efficiency of
migration and the frequency of rocky planets in the habital zone.
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