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Interpretation of a Short-term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486 (CROSBI ID 198986)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Hwang, K-H. ; ... ; Dominis Prester, Dijana ; ... ; street, R.A. Interpretation of a Short-term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486 // The Astrophysical journal, 778 (2013), 1; 55-1-55-6

Podaci o odgovornosti

Hwang, K-H. ; ... ; Dominis Prester, Dijana ; ... ; street, R.A.

engleski

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

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.

binaries: general; gravitational lensing: micro; planets and satellites: detection

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Podaci o izdanju

778 (1)

2013.

55-1-55-6

objavljeno

0004-637X

Povezanost rada

Fizika

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