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Advances in Astronomy
Volume 2015 (2015), Article ID 402303, 8 pages
Research Article

Estimating Finite Source Effects in Microlensing Events due to Free-Floating Planets with the Euclid Survey

1Department of Physics, University of Tirana, Tirana, Albania
2Department of Mathematics and Physics “Ennio De Giorgi’” and INFN, University of Salento, CP 193, 73100 Lecce, Italy

Received 24 April 2015; Accepted 5 August 2015

Academic Editor: Zdzislaw E. Musielak

Copyright © 2015 Lindita Hamolli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In recent years free-floating planets (FFPs) have drawn a great interest among astrophysicists. Gravitational microlensing is a unique and exclusive method for their investigation which may allow obtaining precious information about their mass and spatial distribution. The planned Euclid space-based observatory will be able to detect a substantial number of microlensing events caused by FFPs towards the Galactic bulge. Making use of a synthetic population algorithm, we investigate the possibility of detecting finite source effects in simulated microlensing events due to FFPs. We find a significant efficiency for finite source effect detection that turns out to be between 20% and 40% for a FFP power law mass function index in the range [0.9, 1.6]. For many of such events it will also be possible to measure the angular Einstein radius and therefore constrain the lens physical parameters. These kinds of observations will also offer a unique possibility to investigate the photosphere and atmosphere of Galactic bulge stars.