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Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486


Hwang, K-H and Choi, J-Y and Bond, IA and Sumi, T and Han, C and Gaudi, BS and Gould, A and Bozza, V and Beaulieu, J-P and Tsapras, Y and Abe, F and Bennett, DP and Botzler, CS and Chote, P and Freeman, M and Fukui, A and Fukunaga, D and Harris, P and Itow, Y and Koshimoto, N and Ling, CH 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 Suzuki, D and Tristram, PJ and Wada, K and Yamai, N and Yock, PCM and Yonehara, A and Andrade de Almeida, L and DePoy, DL and Dong, S and Jablonski, F and Jung, YK and Kavka, A and Lee, C-U and Park, H and Pogge, RW and Shin, I-G and Yee, JC and Albrow, MD and Bachelet, E and Batista, V and Brillant, S and Caldwell, JAR and Cassan, A and Cole, A and Corrales, E and Coutures, C and Dieters, S and Dominis Prester, D and Donatowicz, J and Fouque, P and Greenhill, J and Jorgensen, UG and Kane, SR and Kubas, D and Marquette, J-B and Martin, R and Meintjes, P and Menzies, J and Pollard, KR and Williams, A and Wouters, D and Bramich, DM and Dominik, M and Horne, K and Browne, P and Hundertmark, M and Ipatov, S and Kains, N and Snodgrass, C and Steele, IA and Street, RA, Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486, Astrophysical Journal, 778, (1) Article 55. ISSN 0004-637X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The American Astronomical Society

DOI: doi:10.1088/0004-637X/778/1/55


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 the 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.

Item Details

Item Type:Refereed Article
Keywords:binaries: general – gravitational lensing: micro – planets and satellites: detection
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, A (Professor Andrew Cole)
UTAS Author:Greenhill, J (Dr John Greenhill)
ID Code:88681
Year Published:2013
Web of Science® Times Cited:24
Deposited By:Mathematics and Physics
Deposited On:2014-02-12
Last Modified:2017-11-06

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