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Reanalyses of Anomalous Gravitational Microlensing Events in the OGLE-III Early Warning System Database with Combined Data

Jeong, J and Park, H and Han, C and Gould, A and Udalski, A and Szymanski, MK and Pietrzynski, G and Soszynski, I and Poleski, R and Ulaczyk, K and Wyrzykowski, L and Abe, F and Bennett, DP and Bond, IA and Botzler, CS and Freeman, M and Fukui, A and Fukunaga, D and Itow, Y and Koshimoto, N and Masuda, K and Matsubara, Y and Muraki, Y and Namba, S and Ohnishi, K and Rattenbury, NJ and Saito, T and Sullivan, DJ and Sweatman, WL and Sumi, T and Suzuki, D and Tristram, PJ and Tsurumi, N and Wada, K and Yamai, N and Yock, PCM and Yonehara, A and Albrow, MD and Batista, V and Beaulieu, J-P and Caldwell, JAR and Cassan, A and Cole, A and Coutures, C and Dieters, S and Dominik, M and Prester, DD and Donatowicz, J and Fouque, P and Greenhill, J and Hoffman, M and Huber, M and Jorgensen, UG and Kane, SR and Kubas, D and Martin, R and Marquette, J-B and Menzies, J and Pitrou, C and Pollard, K and Sahu, KC and Vinter, C and Wambsganss, J and Williams, A and Allen, W and Bolt, G and Choi, J-Y and Christie, GW and DePoy, DL and Drummond, J and Gaudi, BS and Hwang, K-H and Jung, YK and Lee, C-U and Mallia, F and Maoz, D and Maury, A and McCormick, J and Monard, LAG and Moorhouse, D and Natusch, T and Ofek, EO and Park, B-G and Pogge, RW and Santallo, R and Shin, I-G and Thornley, G and Yee, JC and Bramich, DM and Burgdorf, M and Horne, K and Hundertmark, M and Kains, N and Snodgrass, C and Steele, IA and Street, R and Tsapras, Y (2015) Reanalyses of Anomalous Gravitational Microlensing Events in the OGLE-III Early Warning System Database with Combined Data. Astrophysical Journal, 804 (1). ISSN 0004-637X

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 09 May 2017 09:03
Last Modified: 09 May 2017 09:03
DOI or Identification number: 10.1088/0004-637X/804/1/38
URI: http://researchonline.ljmu.ac.uk/id/eprint/6385

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