Expansion of the Planet Detection Channels in Next-Generation Microlensing Surveys

Abstract

We classify various types of planetary lensing signals and the channels of detecting them. We estimate the relative frequencies of planet detections through the individual channels with special emphasis on the new channels to be additionally provided by future lensing experiments that will survey wide fields continuously at high cadence by using very large-format imaging cameras. From this investigation, we find that the fraction of wide-separation planets that would be discovered through the new channels of detecting planetary signals as independent and repeating events would be substantial. We estimate that the fraction of planets detectable through the new channels would comprise ~15 -- 30% of all planets depending on the models of the planetary separation distribution and mass ratios of planets. Considering that a significant fraction of planets might exist in the form of free-floating planets, the frequency of planets to be detected through the new channel would be even higher. With the expansion of the channels of detecting planet, future lensing surveys will greatly expand the range of planets to be probed.

6 pages, 3 figures, one table

References in corpus (23)

• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
• Detecting Earth-Mass Planets with Gravitational Microlensing
• A Jovian-mass Planet in Microlensing Event OGLE-2005-BLG-071
• Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
• Simulation of a Space-Based Microlensing Survey for Terrestrial Extra-Solar Planets
• The Mass Spectrum Of Machos From Parallax Measurements
• Planetary Detection Efficiency of the Magnification 3000 Microlensing Event OGLE-2004-BLG-343
• Maximum likelihood method for estimating the mass and period distributions of extra-solar planets
• Properties of Planetary Caustics in Gravitational Microlensing
• Gravitational lens under perturbations: Symmetry of perturbing potentials with invariant caustics
• Planetary Microlensing at High Magnification
• Constraints on Planetary Companions in the Magnification A=256 Microlensing Event: OGLE-2003-BLG-423
• Limits on the Abundance of Galactic Planets From Five Years of Planet Observations
• Study by MOA of extra-solar planets in gravitational microlensing events of high magnification
• Search for Low-Mass Exoplanets by Gravitational Microlensing at High Magnification
• Gravitational Microlensing: A Tool for Detecting and Characterizing Free-Floating Planets
• Improving the Prospects for Detecting Extrasolar Planets in Gravitational Microlensing in 2002
• Limits on Stellar and Planetary Companions in Microlensing Event OGLE-1998-BUL-14
• A New Channel for the Detection of Planetary Systems Through Microlensing: II. Repeating Events
• The possibility of detecting planets in the Andromeda Galaxy

Cited by in corpus (4)

• RoboNet-II: Follow-up observations of microlensing events with a robotic network of telescopes
• Characterization of Microlensing Planets with Moderately Wide Separations
• OGLE-2016-BLG-0263L\lowercase{b}: Microlensing Detection of a Very Low-mass Binary Companion Through a Repeating Event Channel
• Using graphical and pictorial representations to teach introductory astronomy students about the detection of extrasolar planets via gravitational microlensing