[Baps] Two Planetary Talks this Week: Youdin and Holman

[Sarah T. Stewart-Mukhopadhyay]

MONDAY, NOVEMBER 28

12:30 pm: Solar, Stellar and Planetary Sciences Division Seminar
<http://www.cfa.harvard.edu/ssp/today.shtml> . "The Formation of
Planetesimals," Dr. Andrew Youdin, Princeton University. Pratt Conference
Room. 

Abstract: The formation of planetesimals, the first generation of solids
greater than a kilometer, will be addressed. Purely collisional growth of
planetesimals from mm-sized grains faces several fundamental obstacles. As
an appealing alternative, collective instabilities driven by self-gravity
might gather small solids. Stirring by turbulence is thought to prevent such
gravitational instabilities (GI). We show that when dissipation by gas drag
is taken into account, GI persists even in the presence of moderately strong
turbulence. Dissipative GI produces growth times and wavelengths longer than
traditional dynamical collapse. Applications to meteorites from the asteroid
belt and mm-wave observations will be discussed. 

http://www.cfa.harvard.edu/cfa/calendar/latest.html


THURSDAY, DECEMBER 1 

4:00 pm: Colloquium <http://www.cfa.harvard.edu/colloquia/latest.html> .
"The Use of Transit Timing to Detect Extrasolar Planets," Dr. Matthew
Holman, CfA. Preceded by tea at 3:30 pm. Phillips Auditorium. 

http://www.cfa.harvard.edu/colloquia/latest.html



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