The astrometric signal of microlensing events caused by free floating planets

Astrometric observations of microlensing events can be used to obtain important information about lenses. During these events, the shift of the position of the multiple image centroid with respect to the source star location can be measured. This effect, which is expected to occur on scales from mic...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysics and space science 2018-07, Vol.363 (7), p.1-8, Article 153
Main Authors: Hamolli, Lindita, Hafizi, Mimoza, De Paolis, Francesco, Nucita, Achille A.
Format: Article
Language:English
Subjects:
Astrobiology
Astronomy
Astrophysics
Astrophysics and Astroparticles
Cosmology
Galactic bulge
Galaxies
Microlenses
Milky Way
Observations and Techniques
Original Article
Photometric observations
Photometry
Physical properties
Physics
Physics and Astronomy
Planets
Rogue planets
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Telescopes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Astrometric observations of microlensing events can be used to obtain important information about lenses. During these events, the shift of the position of the multiple image centroid with respect to the source star location can be measured. This effect, which is expected to occur on scales from micro-arcseconds to milli-arcseconds, depends on the lens-source-observer system physical parameters. Here, we consider the astrometric and photometric observations by space and ground-based telescopes of microlensing events towards the Galactic bulge caused by free floating planets (FFPs). We show that the efficiency of astrometric signal on photometrically detected microlensing events tends to increase for higher FFP masses in our Galaxy. In addition, we estimate that during five years of the Gaia observations, about a dozen of microlensing events caused by FFPs are expected to be detectable.
ISSN:0004-640X
1572-946X
DOI:10.1007/s10509-018-3374-2