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Reanalyses of anomalous gravitational microlensing events in the OGLE-III early warning system database with combined data

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posted on 2023-05-18, 09:43 authored by Jeong, J, Park, H, Han, C, Gould, A, Udalski, A, Szymanski, MK, Pietrzynski, G, Soszynski, I, Poleski, R, Ulaczyk, K, Wyrzykowski, L, Abe, F, Bennett, DP, Bond, IA, Botzler, CS, Freeman, M, Fukui, A, Fukunaga, D, Itow, Y, Koshimoto, N, Masuda, K, Matsubara, Y, Muraki, Y, Namba, S, Ohnishi, K, Rattenbury, NJ, Saito, To, Sullivan, DJ, Sweatman, WL, Sumi, T, Suzuki, D, Tristram, PJ, Tsurumi, N, Wada, K, Yamai, N, Yock, PCM, Yonehara, A, Albrow, MD, Batista, V, Beaulieu, J-P, Caldwell, JAR, Cassan, A, Andrew ColeAndrew Cole, Coutures, C, Dieters, S, Dominik, M, Dominis Prester, D, Donatowicz, J, Fouque, P, Greenhill, J, Hoffman, M, Huber, M, Jorgensen, UG, Kane, SR, Kubas, D, Martin, R, Marquette, J-B, Menzies, J, Pitrou, C, Pollard, K, Sahu, KC, Vinter, C, Wambsganss, J, Williams, A, Allen, W, Bolt, G, Choi, J-Y, Christie, GW, DePoy, DL, Drummond, J, Gaudi, BS, Hwang, K-H, Jung, YK, Lee, C-U, Mallia, F, Maoz, D, Maury, A, McCormick, J, Monard, LAG, Moorhouse, D, Natusch, T, Ofek, EO, Park, B-G, Pogge, RW, Santallo, R, Shin, I-G, Thornley, G, Yee, JC, Bramich, DM, Burgdorf, M, Horne, K, Hundertmark, M, Kains, N, Snodgrass, C, Steele, I, Street, R, Tsapras, Y
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.

History

Publication title

The Astrophysical Journal

Volume

804

Article number

38

Number

38

Pagination

1-11

ISSN

0004-637X

Department/School

School of Natural Sciences

Publisher

Institute of Physics Publishing

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

© 2015. The American Astronomical Society

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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    University Of Tasmania

    Categories

    Keywords

    exoplanetsmicrolensingbinaries: closegravitational lensing: micro

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    In Copyright

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