ELFT HÍRADÓ

[uhlar AT konkoly.hu (Karola_Uhlar)]

                                Meghívó
                 az  MTA CSFK Csillagászati Intézete 
                             szemináriumára

Elõadó: David Heyrovsky (Charles University, Prague)

Cím: Detecting Planets by Gravitational Microlensing

Kivonat:
The two main techniques for finding exoplanets, the Doppler and planetary 
transit methods, are both sensitive primarily to close-in giant planets. 
In comparison, gravitational microlensing enables the detection of other 
types of planets, such as Earth-mass planets at AU separations from their 
host stars. The gravitational microlensing effect occurs when a 
stellar-mass object passes in the foreground of a distant observed star, 
located for example in the Galactic Bulge. During the course of the 
passage the gravitational field of the object temporarily amplifies the 
light from the background star. The structure of the measured light curve 
of such a microlensing event depends on the nature of the lensing object. 
Usually the lens is just a single star or a binary star, but occasionally 
the lens is found to be a star with one or more planets. In this seminar I 
will describe the technique, the planets detected by it so far, and 
discuss its prospects for the future.

Az elõadás idõpontja: 2012. április 19., csütörtök 14 óra 

Helye: MTA CSFK CSI elõadóterme Budapest, XII., Konkoly Thege M. út 15-17.