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Exoplanets at AAS220 according to Twitter

RT @NASAKepler J Orosz: More than half of the stars are in binary systems. An important place to search for planets.

@NasaKepler: small, close-in planets can form around metal-poor stars, but close-in Jupiters form only around metal-rich stars.

jerome orosz: kepler finds 4th circumbinary ('tatooine') planet: kepler-38b, 4.35 R_E, P=105.6 days

andrew howard: kepler sees paucity of planets smaller than 2x earth size. could (still) be selection effect, but might be real.

natalie batalha: kepler's best candidate yet for earthlike planet in habitable zone of its (cool) star: KOI-2124.01 (1 R_E, P=42.3d)

jack lissauer: kepler-33 (5 planets) is extremely flat system, seen *exactly* edge-on #aas220 (all planets follow same chord across star)

jason steffen: hot jupiters are very lonely population: no other planets in systems that contain hot jupiter

andrew howard: hot jupiters are pretty rare: 1,000x less common than earth-to-neptune-sized planets

jason steffen: hot neptunes, hot earths and warm jupiters *do* have companion planets in same system (30%, 30%, 10%)

The new 'Periodic Table of Exoplanets' includes Kepler Candidates and the Solar System http://phl.upr.edu/projects/habitable-exoplanets-catalog/media/pte

Habitable zone (Galaxy) - the existence of rocky planets requires supernova to create the heavy elements, so the center of the galaxy is better, on the other hand supernova are dangerous for living organisms so you want planets away from galactic center. Solution: The Sun may have originated nearer the center but have migrated outwards.^[1] - instead of a GHZ you have a Galactic Habitable History, perhaps this also applies to history of planetary migration within a system - HHs instead of HZs