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Astrophysics Luncheon Seminar

Exploring the Free-Floating Planet Population with Gravitational Microlensing
Presented by Przemek Mroz
Warsaw University Observatory

Monday, April 15, 2019
12:00 noon in 169-336

Theories of planet formation predict the existence of a population of free-floating planets that are not gravitationally tethered to any host star. Gravitational microlensing provides a unique tool for studying these objects. The first results of Sumi et al. (2011) claimed that Jupiter-mass free-floating planets are as common as main-sequence stars. However, these results disagree with censuses of substellar objects in young clusters and star-forming regions and with predictions of planet formation theories. I will present new results of the analysis of a ten times larger sample of microlensing events discovered by the OGLE-IV survey during the years 2010-2018, which shed new light on the population of free-floating planets. I will also discuss prospects for detecting free-floating planets with future missions, like Euclid and WFIRST.

JPL Contact: Geoff Bryden (3-4692)

SVCP Astrophysics

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