Izbrane teme sodobne fizike in matematike
Iskanje planetov z gravitacijskim mikrolečenjem temelji na ojačitvi svetlobe zvezde v ozadju zaradi prehoda planeta daleč pred njo. V članku so na začetku predstavljene preostale metode iskanja planetov ter diskusija o vprašanju, kaj sploh lahko definiramo kot planet. Nato sledi izpeljava preprostega modela mikrolečenja in vključitev popravkov modela. Nato sta predstavljeni dve izbrani odkritji planetov z mikrolečenjem, ki nakazujeta na težave pri uporabi te metode. Sledi pregled zmogljivosti, ki jih mikrolečenje dosega v primerjavi z ostalimi metodami, ter izpostavitev njegovih pomanjkljivosti. Članek se zaključi z napovedjo prihodnjih odkritij planetov z mikrolečenjem.
The search for planets through gravitational microlensing is based on the temporary magnification of light from a background star caused by a planet passing far in front of it. The article begins with a brief overview of other methods used to detect planets and discusses the question of what should be considered a planet. This is followed by a derivation of a simple microlensing model and a discussion of its corrections. Two selected planet discoveries made through microlensing are then presented, illustrating some of the challenges associated with this method. Finally, the capabilities of microlensing that cannot be matched by other detection techniques are discussed and compared with other methods and its limitations are presented. The article concludes with an outlook on future planet discoveries through gravitational microlensing.