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M31 pixel lensing event OAB-N2

     
 

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Unpublished WeCAPP data allows us to confirm OAB-N2, previously reported only as a viable candidate, as a well constrained pixel lensing event. The updated photometry enables a detailed analysis in the event parameter space including the effects due to finite source size. The combined results of these analyses allow us to put a strong lower limit on the lens proper motion. This outcome favors the MACHO lensing hypothesis over self lensing for this individual event.

 

 

OAB-N2 light curve. Circles (boxes) are for R (I)-band, with filled (empty) symbols for OAB (WeCAPP) data. The solid (dashed) lines show the best fit with (without) inclusion of finite size source effect. The abscissa units are time in days (JD-2450000.0). The ordinate units are flux in ADU s−1 per superpixel.

 
 
 
 
 
   

Editor of this page: Luigi Mancini  Last update: 27/05/2010