Investigating the free-floating planet mass by Euclid observations
arXiv:1607.03029 · doi:10.1007/s10509-016-2860-7
Abstract
The detection of anomalies in gravitational microlensing events is nowadays one of the main goals among the microlensing community. In the case of single-lens events, these anomalies can be caused by the finite source effects, that is when the source disk size is not negligible, and by the Earth rotation around the Sun (the so-called parallax effect). The finite source and parallax effects may help to define the mass of the lens, uniquely. Free-floating planets (FFPs) are extremely dim objects, and gravitational microlensing provides at present the exclusive method to investigate these bodies. In this work, making use of a synthetic population algorithm, we study the possibility of detecting the finite source and parallax effects in simulated microlensing events caused by FFPs towards the Galactic bulge, taking into consideration the capabilities of the space-based Euclid telescope. We find a significant efficiency for detecting the parallax effect in microlensing events with detectable finite source effect, that turns out to be about 51% for mass function index .
arXiv commentAstrophysics and Space Science 2016
References in corpus (11)
- Unbound or Distant Planetary Mass Population Detected by Gravitational Microlensing
- Detecting Earth-Mass Planets with Gravitational Microlensing
- First Observation of Parallax in a Gravitational Microlensing Event
- Nomads of the Galaxy
- OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star
- Gravitational Microlensing: A Tool for Detecting and Characterizing Free-Floating Planets
- Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
- Estimating Finite Source Effects in Microlensing Events due to Free-Floating Planets with the Euclid Survey
- Astrophysical implications of gravitational microlensing of gravitational waves
- Microlensing Zone of Planets Detectable through the Channel of High-Magnification Events
- Microlensing signature of a white dwarf population in the galactic halo
Cited by in corpus (4)
- Euclid-Roman joint microlensing survey: early mass measurement, free floating planets and exomoons
- Never bet against Einstein
- The impact of the free-floating planet (FFP) mass function on the event rate for the accurate microlensing parallax determination: application to Euclid and Roman parallax observation
- The astrometric signal of microlensing events caused by free floating planets