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Rapidly rotating lenses: repeating features in the light curves of short-period binary microlenses
Penny, Matthew T.1; Kerins, Eamonn1; Mao, Shude1,2
2011-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume417Issue:3Pages:2216-2229
AbstractMicrolensing is most sensitive to binary lenses with relatively large orbital separations, and as such, typical binary microlensing events show little or no orbital motion during the event. However, despite the strength of binary microlensing features falling off rapidly as the lens separation decreases, we show that it is possible to detect repeating features in the light curve of binary microlenses that complete several orbits during the microlensing event. We investigate the light-curve features of such rapidly rotating lens (RRL) events. We derive analytical limits on the range of parameters where these effects are detectable, and confirm these numerically. Using a population synthesis Galactic model, we estimate the RRL event rate for a ground-based and a space-based microlensing survey to be 0.32f(b) and 7.8f(b) events per year, respectively, assuming year-round monitoring, where f(b) is the binary fraction. We detail how RRL event parameters can be quickly estimated from their light curves, and suggest a method to model RRL events using timing measurements of light-curve features. Modelling RRL light curves will yield the lens orbital period and possibly measurements of all orbital elements, including the inclination and eccentricity. Measurement of the period from the light curve allows a mass-distance relation to be defined, which when combined with a measurement of microlens parallax or finite-source effects can yield a mass measurement to a twofold degeneracy. With sub-per cent accuracy photometry, it is possible to detect planetary companions, but the likelihood of this is very small.
KeywordGravitational Lensing: Micro Celestial Mechanics Binaries: General Planetary Systems Galaxy: Bulge
DOI10.1111/j.1365-2966.2011.19403.x
Indexed BySCI
Language英语
WOS IDWOS:000297043600040
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7865
Collection星系宇宙学研究部
Affiliation1.Univ Manchester, Sch Phys & Astron, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Penny, Matthew T.,Kerins, Eamonn,Mao, Shude. Rapidly rotating lenses: repeating features in the light curves of short-period binary microlenses[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,417(3):2216-2229.
APA Penny, Matthew T.,Kerins, Eamonn,&Mao, Shude.(2011).Rapidly rotating lenses: repeating features in the light curves of short-period binary microlenses.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,417(3),2216-2229.
MLA Penny, Matthew T.,et al."Rapidly rotating lenses: repeating features in the light curves of short-period binary microlenses".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 417.3(2011):2216-2229.
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