[Baps] Seminar on Planet Formation by Seth Jacobson, Wed Nov 13 @ 2pm

[Sarah Stewart-Mukhopadhyay]

Seth Jacobson is visiting Harvard all week and giving a talk at CfA on
Wednesday:

SSP Seminar

Dr. Seth Jacobson
University of Bayreuth / Nice Observatory

Wednesday November 13 at 2pm at CfA in the Pratt Conference Room
(http://www.cfa.harvard.edu/ssp/events.html)

Title: "Terrestrial planet formation in the age of the truncated disk."

Abstract:
After reviewing the standard model of terrestrial planet formation, both
its successes and failures. I will introduce the recently proposed solution
to the small Mars mass problem, the truncated disk. The Grand Tack model
exploits the gas-driven migration of giant planets observed in extra-solar
planet systems to motivate this truncation. In this model the first inward
and then outward migration of Jupiter and Saturn creates a truncated disk
of embryos and planetesimals, of which the subsequent evolution broadly
reproduces the orbital and mass distributions of the terrestrial planets
including a small Mars.

New results will be presented that explore a large number of N-body
simulations that model a variety of different oligarchic growth regime
initial conditions. From this dataset, we discover a correlation between
the time of the last giant impact and the late accreted mass. From highly
siderophile element constraints on the late accreted mass, we are able to
estimate the time of the last giant (Moon forming) impact. These
terrestrial disks still produce good analog terrestrial planet mass-orbit
distributions, but now have a large distribution of different accretion
histories. We find a portion of parameter space that is able to match Solar
System constraints such as the date of the Moon forming impact, the mass of
late accretion, and the rapid growth of Mars.
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