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Interpretation of a Short-Term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486

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arxiv 1308.5762 v1 pith:EVFFNVPN submitted 2013-08-27 astro-ph.SR

Interpretation of a Short-Term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486

K.-H. Hwang , J.-Y. Choi , I. A. Bond , T. Sumi , C. Han , B. S. Gaudi , A. Gould , V. Bozza
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J.-P. Beaulieu Y. Tsapras F. Abe D. P. Bennett C. S. Botzler P. Chote M. Freeman A. Fukui D. Fukunaga P. Harris Y. Itow N. Koshimoto C. H. Ling K. Masuda Y. Matsubara Y. Muraki S. Namba K. Ohnishi N. J. Rattenbury To. Saito D. J. Sullivan W. L. Sweatman D. Suzuki P. J. Tristram K. Wada N. Yamai P. C. M. Yock A. Yonehara L. Andrade de Almeida D. L. DePoy Subo Dong F. Jablonski Y. K. Jung A. Kavka C.-U. Lee H. Park R. W. Pogge I.-G. Shin J. C. Yee M. D. Albrow E. Bachelet V. Batista S. Brillant J. A. R. Caldwell A. Cassan A. Cole E. Corrales Ch. Coutures S. Dieters D. Dominis Prester J. Donatowicz P. Fouqu\'e J. Greenhill U. G. J{\o}rgensen S. R. Kane D. Kubas J.-B. Marquette R. Martin P. Meintjes J. Menzies K. R. Pollard A. Williams D. Wouters D. M. Bramich M. Dominik K. Horne P. Browne M. Hundertmark S. Ipatov N. Kains C. Snodgrass I. A. Steele R. A. Street
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classification astro-ph.SR
keywords planetarybinary-sourceeventmicrolensingmodelperturbationshort-termbest-fit
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A planetary microlensing signal is generally characterized by a short-term perturbation to the standard single lensing light curve. A subset of binary-source events can produce perturbations that mimic planetary signals, thereby introducing an ambiguity between the planetary and binary-source interpretations. In this paper, we present analysis of the microlensing event MOA-2012-BLG-486, for which the light curve exhibits a short-lived perturbation. Routine modeling not considering data taken in different passbands yields a best-fit planetary model that is slightly preferred over the best-fit binary-source model. However, when allowed for a change in the color during the perturbation, we find that the binary-source model yields a significantly better fit and thus the degeneracy is clearly resolved. This event not only signifies the importance of considering various interpretations of short-term anomalies, but also demonstrates the importance of multi-band data for checking the possibility of false-positive planetary signals.

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