December 3, 2013
AST101 – Lecture 22 (23 class)
o largest wobble of a parent star would be with a higher mass and close by
bigger = more gravity, closer = more gravity
o Doppler shift (graph curve) estimates mass of a planet (textbook has a boo-boo)
o “hot Jupiter” – most radial velocity planets are
lots of the planets observed are closer to their parent star than Jupiter is to the Sun
this is because they have moved inward
chucked out all the terrestrial planets
those planets are “rogue” now
Jovian planets moved in (but will soon evaporate b/c too close to the Sun
and only made out of easily-evaporated gases like hydrogen and helium)
o What if Ganymede/Europa/Callisto hitched a ride to the Sun with Jupiter (like Jovian
planets in other solar systems)?
suddenly, we might have habitable moons!
o apparent overabundance of hot Jupiters is another bias becaus