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Lecture 37: Strange New Worlds
What are the properties of the 400+ exoplanets we have discovered so
far? This lecture reviews the properties of exoplanets, and finds a
couple of surprises: Jupiter-mass planets orbiting close to their parent
stars, and Jupiter-mass planets in very elliptical orbits. Both seem to
require some mechanism for migration: strong gravitational interactions
with either the protoplanetary disk or other giant planets to cause the
planets to move inward from their birth places beyond the "Ice Line".
We will then briefly discuss why we are seeing systems very different
from our own, mostly we think a selection effect due to our search
methods to date. Microlensing, however, is more sensitive to systems
like ours, and is starting to find them. Earths, however, remain
elusive so far, but the hunt is on. Recorded live on 2009 Nov 18 in
Room 1005 Smith Laboratory on the Columbus campus of The Ohio State
University.
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By Richard Pogge
4.7
181181 ratings
What are the properties of the 400+ exoplanets we have discovered so
far? This lecture reviews the properties of exoplanets, and finds a
couple of surprises: Jupiter-mass planets orbiting close to their parent
stars, and Jupiter-mass planets in very elliptical orbits. Both seem to
require some mechanism for migration: strong gravitational interactions
with either the protoplanetary disk or other giant planets to cause the
planets to move inward from their birth places beyond the "Ice Line".
We will then briefly discuss why we are seeing systems very different
from our own, mostly we think a selection effect due to our search
methods to date. Microlensing, however, is more sensitive to systems
like ours, and is starting to find them. Earths, however, remain
elusive so far, but the hunt is on. Recorded live on 2009 Nov 18 in
Room 1005 Smith Laboratory on the Columbus campus of The Ohio State
University.
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