Show simple item record

dc.creatorGaudi, B. Scott
dc.date.accessioned2011-01-25T17:17:02Z
dc.date.available2011-01-25T17:17:02Z
dc.date.issued1998-10-20
dc.identifier.citationB. Scott Gaudi, "Distinguishing Between Binary-Source and Planetary Microlensing Perturbations," The Astrophysical Journal 506, no. 2 (1998), doi: 10.1086/306256, http://iopscience.iop.org/0004-637X/506/2/533en_US
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/1811/47610
dc.description.abstractA planetary microlensing event is characterized by a short-lived perturbation to the standard microlensing curve. Planetary perturbations typically last from a few hours to a day, have maximum amplitudes, δ_max, of ±5%-20% of the standard curve, and come in two classes: major and minor image perturbations. There exist a subset of binary-source events that can reproduce the main features of major image perturbations, which are likely to represent more than half of all planetary events, and thus masquerade as planetary events. These events require a binary source with a small flux ratio, epsilon ~ 10^-2 to 10^-4, and a small impact parameter for the fainter source, β_2 <~ ε/δmax. The detection probability of events of this type is ~β_2, and can be as high as ~30%; this is comparable to planetary detection rates. Thus a sample of planetary-like perturbations could be seriously contaminated by binary-source events, and there exists the possibility that completely meaningless physical parameters would be derived for any given major image perturbation. Here I derive analytic expressions for a binary-source event in the extreme flux-ratio limit and use these to demonstrate the basic degeneracy between binary-source and planet perturbations. I describe how the degeneracy can be broken by dense and accurate sampling of the perturbation, optical/infrared photometry, or spectroscopic measurements.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Astronomical Societyen_US
dc.subjectplanetary systemsen_US
dc.subjectgravitational lensingen_US
dc.titleDistinguishing Between Binary-Source and Planetary Microlensing Perturbationsen_US
dc.typeArticleen_US
dc.identifier.doi10.1086/306256
dc.identifier.osuauthorgaudi.1


Files in this item

Thumbnail

Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.

This item appears in the following Collection(s)

Show simple item record