Reanalyses of anomalous gravitational microlensing events in the OGLE-III early warning system database with combined data
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We reanalyze microlensing events in the published list of anomalous events that were observed from the Optical Gravitational Lensing Experiment (OGLE) lensing survey conducted during the 2004–2008 period. In order to check the existence of possible degenerate solutions and extract extra information, we conduct analyses based on combined data from other survey and follow-up observation and consider higher-order effects. Among the analyzed events, we present analyses of eight events for which either new solutions are identified or additional information is obtained. We find that the previous binary-source interpretations of five events are better interpreted by binary-lens models. These events include OGLE-2006-BLG-238, OGLE-2007-BLG-159, OGLE-2007-BLG-491, OGLE-2008-BLG-143, and OGLE-2008-BLG-210. With additional data covering caustic crossings, we detect finite-source effects for six events including OGLE-2006-BLG-215, OGLE-2006-BLG-238, OGLE-2006-BLG-450, OGLE-2008-BLG-143, OGLE-2008-BLG-210, and OGLE-2008-BLG-513. Among them, we are able to measure the Einstein radii of three events for which multi-band data are available. These events are OGLE-2006-BLG-238, OGLE-2008-BLG-210, and OGLE-2008-BLG-513. For OGLE-2008-BLG-143, we detect higher-order effects induced by the changes of the observer's position caused by the orbital motion of the Earth around the Sun. In addition, we present degenerate solutions resulting from the known close/wide or ecliptic degeneracy. Finally, we note that the masses of the binary companions of the lenses of OGLE-2006-BLG-450 and OGLE-2008-BLG-210 are in the brown-dwarf regime.
Jeong , J , Park , H , Han , C , Gould , A , Udalski , A , Szymański , M K , Pietrzyński , G , Soszyński , I , Poleski , R , Ulaczyk , K , Wyrzykowski , Ł , Abe , F , Bennett , D P , Bond , I A , Botzler , C S , Freeman , M , Fukui , A , Fukunaga , D , Itow , Y , Koshimoto , N , Masuda , K , Matsubara , Y , Muraki , Y , Namba , S , Ohnishi , K , Rattenbury , N J , Saito , T , Sullivan , D J , Sweatman , W L , Sumi , T , Suzuki , D , Tristram , P J , Tsurumi , N , Wada , K , Yamai , N , Yock , P C M , Yonehara , A , Albrow , M D , Batista , V , Beaulieu , J-P , Caldwell , J A R , Cassan , A , Cole , A , Coutures , C , Dieters , S , Dominik , M , Dominis Prester , D , Donatowicz , J , Fouqué , P , Greenhill , J , Hoffman , M , Huber , M , Jørgensen , U G , Kane , S R , Kubas , D , Martin , R , Marquette , J-B , Menzies , J , Pitrou , C , Pollard , K , Sahu , K C , Vinter , C , Wambsganss , J , Williams , A , Allen , W , Bolt , G , Choi , J-Y , Christie , G W , DePoy , D L , Drummond , J , Gaudi , B S , Hwang , K-H , Jung , Y K , Lee , C-U , Mallia , F , Maoz , D , Maury , A , McCormick , J , Monard , L A G , Moorhouse , D , Natusch , T , Ofek , E O , Park , B-G , Pogge , R W , Santallo , R , Shin , I-G , Thornley , G , Yee , J C , Bramich , D M , Burgdorf , M , Horne , K , Hundertmark , M , Kains , N , Snodgrass , C , Steele , I , Street , R & Tsapras , Y 2015 , ' Reanalyses of anomalous gravitational microlensing events in the OGLE-III early warning system database with combined data ' Astrophysical Journal , vol 804 , no. 1 . DOI: 10.1088/0004-637X/804/1/38
© 2015. The American Astronomical Society. All rights reserved.
Work by C.H. was supported by the Creative Research Initiative Program (2009-0081561) of the National Research Foundation of Korea. The OGLE project has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement no. 246678 to AU. The MOA project is supported by the grants JSPS18253002 and JSPS20340052. T.S. acknowledges the financial support from the JSPS, JSPS23340044 and JSPS24253004. D.P.B. was supported by grants NASA-NNX12AF54G, JPL-RSA 1453175, and NSF AST-1211875. B.S.G. and A.G. were supported by NSF grant AST 110347. B.S.G., A.G., and R.P.G. were supported by NASA grant NNX12AB99G.
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