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; 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. Fouqué; J. Greenhill; U. G. Jørgensen; 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; Noé Kains; C. Snodgrass; I. A. Steele; R. A. Street

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

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, 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. KoshimotoC. 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. Fouqué, J. Greenhill, U. G. Jørgensen, 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, Noé Kains, C. Snodgrass, I. A. Steele, R. A. Street

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	55
Number of pages	6
Journal	Astrophysical Journal
Volume	778
Issue number	1
Early online date	1 Nov 2013
DOIs	https://doi.org/10.1088/0004-637X/778/1/55
Publication status	Published - 20 Nov 2013

Keywords

Binaries: general
Gravitational lensing: micro
Planets and satellites: detection

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10.1088/0004-637X/778/1/55

Dominik_2013_TAJ_Interpretation
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AGN Echo mapping: AGN Echo Mapping and Mineral Clouds in Alien Atmospheres
Horne, K. D. (PI)
Science & Technology Facilities Council
1/04/12 → 31/08/12
Project: Standard
Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard

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Hwang, K.-H., Choi, J.-Y., Bond, I. A., Sumi, T., Han, C., Gaudi, B. S., Gould, A., Bozza, V., Beaulieu, J.-P., Tsapras, Y., Abe, F., Bennett, D. P., Botzler, C. S., Chote, P., Freeman, M., Fukui, A., Fukunaga, D., Harris, P., Itow, Y., ... Street, R. A. (2013). Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486. Astrophysical Journal, 778(1), Article 55. https://doi.org/10.1088/0004-637X/778/1/55

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

abstract = "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.",

keywords = "Binaries: general, Gravitational lensing: micro, Planets and satellites: detection",

author = "K.-H. Hwang and J.-Y. Choi and Bond, {I. A.} and T. Sumi and C. Han and Gaudi, {B. S.} and A. Gould and V. Bozza and J.-P. Beaulieu and Y. Tsapras and F. Abe and Bennett, {D. P.} and Botzler, {C. S.} and P. Chote and M. Freeman and A. Fukui and D. Fukunaga and P. Harris and Y. Itow and N. Koshimoto and Ling, {C. H.} and K. Masuda and Y. Matsubara and Y. Muraki and S. Namba and K. Ohnishi and Rattenbury, {N. J.} and To. Saito and Sullivan, {D. J.} and Sweatman, {W. L.} and D. Suzuki and Tristram, {P. J.} and K. Wada and N. Yamai and Yock, {P. C. M.} and A. Yonehara and {de Almeida}, {L. Andrade} and DePoy, {D. L.} and Subo Dong and F. Jablonski and Jung, {Y. K.} and A. Kavka and C.-U. Lee and H. Park and Pogge, {R. W.} and I.-G. Shin and Yee, {J. C.} and Albrow, {M. D.} and E. Bachelet and V. Batista and S. Brillant and Caldwell, {J. A. R.} and A. Cassan and A. Cole and E. Corrales and Ch. Coutures and S. Dieters and {Dominis Prester}, D. and J. Donatowicz and P. Fouqu{\'e} and J. Greenhill and J{\o}rgensen, {U. G.} and Kane, {S. R.} and D. Kubas and J.-B. Marquette and R. Martin and P. Meintjes and J. Menzies and Pollard, {K. R.} and A. Williams and D. Wouters and Bramich, {D. M.} and M. Dominik and K. Horne and P. Browne and M. Hundertmark and S. Ipatov and No{\'e} Kains and C. Snodgrass and Steele, {I. A.} and Street, {R. A.}",

note = "D.M.B., M.D., K.H., M.H., S.I., C.S., R.A.S., and Y.T. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). K.H. is supported by a Royal Society Leverhulme Senior Research Fellowship.",

year = "2013",

month = nov,

day = "20",

doi = "10.1088/0004-637X/778/1/55",

language = "English",

volume = "778",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Hwang, K-H, Choi, J-Y, Bond, IA, Sumi, T, Han, C, Gaudi, BS, Gould, A, Bozza, V, Beaulieu, J-P, Tsapras, Y, Abe, F, Bennett, DP, Botzler, CS, Chote, P, Freeman, M, Fukui, A, Fukunaga, D, Harris, P, Itow, Y, Koshimoto, N, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Namba, S, Ohnishi, K, Rattenbury, NJ, Saito, T, Sullivan, DJ, Sweatman, WL, Suzuki, D, Tristram, PJ, Wada, K, Yamai, N, Yock, PCM, Yonehara, A, de Almeida, LA, DePoy, DL, Dong, S, Jablonski, F, Jung, YK, Kavka, A, Lee, C-U, Park, H, Pogge, RW, Shin, I-G, Yee, JC, Albrow, MD, Bachelet, E, Batista, V, Brillant, S, Caldwell, JAR, Cassan, A, Cole, A, Corrales, E, Coutures, C, Dieters, S, Dominis Prester, D, Donatowicz, J, Fouqué, P, Greenhill, J, Jørgensen, UG, Kane, SR, Kubas, D, Marquette, J-B, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, Williams, A, Wouters, D, Bramich, DM, Dominik, M , Horne, K, Browne, P, Hundertmark, M, Ipatov, S, Kains, N, Snodgrass, C, Steele, IA & Street, RA 2013, 'Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486', Astrophysical Journal, vol. 778, no. 1, 55. https://doi.org/10.1088/0004-637X/778/1/55

TY - JOUR

T1 - Interpretation of a short-term anomaly in the gravitational microlensing event MOA-2012-BLG-486

AU - Hwang, K.-H.

AU - Choi, J.-Y.

AU - Bond, I. A.

AU - Sumi, T.

AU - Han, C.

AU - Gaudi, B. S.

AU - Gould, A.

AU - Bozza, V.

AU - Beaulieu, J.-P.

AU - Tsapras, Y.

AU - Abe, F.

AU - Bennett, D. P.

AU - Botzler, C. S.

AU - Chote, P.

AU - Freeman, M.

AU - Fukui, A.

AU - Fukunaga, D.

AU - Harris, P.

AU - Itow, Y.

AU - Koshimoto, N.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Muraki, Y.

AU - Namba, S.

AU - Ohnishi, K.

AU - Rattenbury, N. J.

AU - Saito, To.

AU - Sullivan, D. J.

AU - Sweatman, W. L.

AU - Suzuki, D.

AU - Tristram, P. J.

AU - Wada, K.

AU - Yamai, N.

AU - Yock, P. C. M.

AU - Yonehara, A.

AU - de Almeida, L. Andrade

AU - DePoy, D. L.

AU - Dong, Subo

AU - Jablonski, F.

AU - Jung, Y. K.

AU - Kavka, A.

AU - Lee, C.-U.

AU - Park, H.

AU - Pogge, R. W.

AU - Shin, I.-G.

AU - Yee, J. C.

AU - Albrow, M. D.

AU - Bachelet, E.

AU - Batista, V.

AU - Brillant, S.

AU - Caldwell, J. A. R.

AU - Cassan, A.

AU - Cole, A.

AU - Corrales, E.

AU - Coutures, Ch.

AU - Dieters, S.

AU - Dominis Prester, D.

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Jørgensen, U. G.

AU - Kane, S. R.

AU - Kubas, D.

AU - Marquette, J.-B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Williams, A.

AU - Wouters, D.

AU - Bramich, D. M.

AU - Dominik, M.

AU - Horne, K.

AU - Browne, P.

AU - Hundertmark, M.

AU - Ipatov, S.

AU - Kains, Noé

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Street, R. A.

N1 - D.M.B., M.D., K.H., M.H., S.I., C.S., R.A.S., and Y.T. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). K.H. is supported by a Royal Society Leverhulme Senior Research Fellowship.

PY - 2013/11/20

Y1 - 2013/11/20

N2 - 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.

AB - 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.

KW - Binaries: general

KW - Gravitational lensing: micro

KW - Planets and satellites: detection

U2 - 10.1088/0004-637X/778/1/55

DO - 10.1088/0004-637X/778/1/55

M3 - Article

SN - 0004-637X

VL - 778

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 55

ER -

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

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AGN Echo mapping: AGN Echo Mapping and Mineral Clouds in Alien Atmospheres

Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

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