Early Estimation of Microlensing Event Magnifications | Zendy

Michael D. Albrow | Zendy

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Early Estimation of Microlensing Event Magnifications

Author(s) -

Michael D. Albrow

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/383565

Subject(s) - gravitational microlensing , event (particle physics) , magnification , sensitivity (control systems) , planet , bayesian probability , focus (optics) , computer science , lens (geology) , minification , algorithm , mathematics , artificial intelligence , astrophysics , physics , optics , computer vision , stars , mathematical optimization , engineering , electronic engineering

Gravitational microlensing events with high peak magnifications provide amuch enhanced sensitivity to the detection of planets around the lens star.However, estimates of peak magnification during the early stages of an event bymeans of chi^2 minimization frequently involve an overprediction, makingobserving campaigns with strategies that rely on these predictions inefficient. I show that a rudimentary Bayesian formulation, incorporating the knownstatistical characteristics of a detection system, produces much more accuratepredictions of peak magnification than chi^2 minimisation. Implementation ofthis system will allow efficient follow-up observing programs that focus solelyon events that contribute to planetary abundance statistics.Comment: Accepted by ApJ. 19 pages, incl 7 figures and 2 table

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