Joachim Wambsganss (Heidelberg)

Searching for Extrasolar Planets with Gravitational Microlensing: Challenges and Exciting Results
Wann Am 05.11.2015 von 14:30 bis 15:30
Was
  • Kolloquium
Wo SH Lecture Hall
Termin übernehmen vCal / iCal

Gravitational microlensing is a very powerful method for the detection of extrasolar planets. In particular its sensitivity to low mass exoplanets and its potential for global statistical analyses are highly relevant. In the talk the basics of this technique and its current mode of operation will be explained as well as its advantages and disadvantages compared to other planet-search methods. About three dozen planets have been discovered so far by microlensing surveys. A couple of microlensing exoplanets will be reviewed in detail. A recent statistical investigation on the Galactic abundance of (bound and possibly unbound) exoplanets will be presented and discussed, with particular emphasis on the result that “Planets are the rule, not the exception”: Abundances analyses show that on average every Milky Way star has at least one planet! In a brief outlook, the immense potential of gravitational microlensing for detections of Earth- and Mars-mass planets, of exomoons and of free-floating planets will be highlighted.