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 interp...

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Main Authors:	Hwang, K., Choi, J., Bond, I., Sumi, T., Han, C., Gaudi, B., Gould, A., Bozza, V., Beaulieu, J., Tsapras, Y., Abe, F., Bennett, D., Botzler, C., Chote, P., Freeman, M., Fukui, A., Fukunaga, D., Harris, P., Itow, Y., Koshimoto, N., Ling, C., Masuda, K., Matsubara, M., Muraki, Y., Namba, S., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sweatman, W., Suzuki, D., Tristram, P., Wada, K., Yamai, N., Yock, P., Yonehara, A., Andrade de Almeida, L., DePoy, D., Dong, S., Jablonski, F., Jung, Y., Kavka, A., Lee, C., Park, H., Pogge, R., Shin, I., Yee, J., Albrow, M., Bachelet, E., Batista, V., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Greenhill, J., Jorgensen, U., Kane, S., Kubas, D., Marquette, J., Martin, R., Meintjes, P., Menzies, J., Pollard, K., Williams, Andrew, Wouters, D., Bramich, D., Dominik, M., Horne, K., Browne, P., Hundertmark, M., Ipatov, S., Kains, N., Snodgrass, C., Steele, I., Street, R.
Format:	Journal Article
Published:	Institute of Physics Publishing 2013
Subjects:	color figures binaries detection Online-only material micro – planets and satellites general – gravitational lensing
Online Access:	http://iopscience.iop.org/0004-637X/778/1/55/pdf/0004-637X_778_1_55.pdf http://hdl.handle.net/20.500.11937/14093

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author	Hwang, K. Choi, J. Bond, I. Sumi, T. Han, C. Gaudi, B. Gould, A. Bozza, V. Beaulieu, J. Tsapras, Y. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Fukunaga, D. Harris, P. Itow, Y. Koshimoto, N. Ling, C. Masuda, K. Matsubara, M. Muraki, Y. Namba, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Sweatman, W. Suzuki, D. Tristram, P. Wada, K. Yamai, N. Yock, P. Yonehara, A. Andrade de Almeida, L. DePoy, D. Dong, S. Jablonski, F. Jung, Y. Kavka, A. Lee, C. Park, H. Pogge, R. Shin, I. Yee, J. Albrow, M. Bachelet, E. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Greenhill, J. Jorgensen, U. Kane, S. Kubas, D. Marquette, J. Martin, R. Meintjes, P. Menzies, J. Pollard, K. Williams, Andrew Wouters, D. Bramich, D. Dominik, M. Horne, K. Browne, P. Hundertmark, M. Ipatov, S. Kains, N. Snodgrass, C. Steele, I. Street, R.
author_facet	Hwang, K. Choi, J. Bond, I. Sumi, T. Han, C. Gaudi, B. Gould, A. Bozza, V. Beaulieu, J. Tsapras, Y. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Fukunaga, D. Harris, P. Itow, Y. Koshimoto, N. Ling, C. Masuda, K. Matsubara, M. Muraki, Y. Namba, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Sweatman, W. Suzuki, D. Tristram, P. Wada, K. Yamai, N. Yock, P. Yonehara, A. Andrade de Almeida, L. DePoy, D. Dong, S. Jablonski, F. Jung, Y. Kavka, A. Lee, C. Park, H. Pogge, R. Shin, I. Yee, J. Albrow, M. Bachelet, E. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Greenhill, J. Jorgensen, U. Kane, S. Kubas, D. Marquette, J. Martin, R. Meintjes, P. Menzies, J. Pollard, K. Williams, Andrew Wouters, D. Bramich, D. Dominik, M. Horne, K. Browne, P. Hundertmark, M. Ipatov, S. Kains, N. Snodgrass, C. Steele, I. Street, R.
author_sort	Hwang, K.
building	Curtin Institutional Repository
collection	Online Access
description	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 clearlyresolved. 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.
first_indexed	2025-11-14T07:06:29Z
format	Journal Article
id	curtin-20.500.11937-14093
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:06:29Z
publishDate	2013
publisher	Institute of Physics Publishing
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-140932017-02-28T01:26:45Z Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486 Hwang, K. Choi, J. Bond, I. Sumi, T. Han, C. Gaudi, B. Gould, A. Bozza, V. Beaulieu, J. Tsapras, Y. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Fukunaga, D. Harris, P. Itow, Y. Koshimoto, N. Ling, C. Masuda, K. Matsubara, M. Muraki, Y. Namba, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Sweatman, W. Suzuki, D. Tristram, P. Wada, K. Yamai, N. Yock, P. Yonehara, A. Andrade de Almeida, L. DePoy, D. Dong, S. Jablonski, F. Jung, Y. Kavka, A. Lee, C. Park, H. Pogge, R. Shin, I. Yee, J. Albrow, M. Bachelet, E. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Greenhill, J. Jorgensen, U. Kane, S. Kubas, D. Marquette, J. Martin, R. Meintjes, P. Menzies, J. Pollard, K. Williams, Andrew Wouters, D. Bramich, D. Dominik, M. Horne, K. Browne, P. Hundertmark, M. Ipatov, S. Kains, N. Snodgrass, C. Steele, I. Street, R. color figures binaries detection Online-only material micro – planets and satellites general – gravitational lensing 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 clearlyresolved. 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/14093 http://iopscience.iop.org/0004-637X/778/1/55/pdf/0004-637X_778_1_55.pdf Institute of Physics Publishing restricted
spellingShingle	color figures binaries detection Online-only material micro – planets and satellites general – gravitational lensing Hwang, K. Choi, J. Bond, I. Sumi, T. Han, C. Gaudi, B. Gould, A. Bozza, V. Beaulieu, J. Tsapras, Y. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Fukunaga, D. Harris, P. Itow, Y. Koshimoto, N. Ling, C. Masuda, K. Matsubara, M. Muraki, Y. Namba, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Sweatman, W. Suzuki, D. Tristram, P. Wada, K. Yamai, N. Yock, P. Yonehara, A. Andrade de Almeida, L. DePoy, D. Dong, S. Jablonski, F. Jung, Y. Kavka, A. Lee, C. Park, H. Pogge, R. Shin, I. Yee, J. Albrow, M. Bachelet, E. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Greenhill, J. Jorgensen, U. Kane, S. Kubas, D. Marquette, J. Martin, R. Meintjes, P. Menzies, J. Pollard, K. Williams, Andrew Wouters, D. Bramich, D. Dominik, M. Horne, K. Browne, P. Hundertmark, M. Ipatov, S. Kains, N. Snodgrass, C. Steele, I. Street, R. Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title	Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title_full	Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title_fullStr	Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title_full_unstemmed	Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title_short	Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486
title_sort	interpretation of a short-term anomaly in the gravitational microlensing event moa-2012-blg-486
topic	color figures binaries detection Online-only material micro – planets and satellites general – gravitational lensing
url	http://iopscience.iop.org/0004-637X/778/1/55/pdf/0004-637X_778_1_55.pdf http://hdl.handle.net/20.500.11937/14093

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

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