INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

C. Han; K. -H. Hwang; D. Kim; A. Udalski; F. Abe; L. A. B. Monard; J. McCormick; M. K. Szymanski; M. Kubiak; G. Pietrzynski; I. Soszynski; O. Szewczyk; L. Wyrzykowski; K. Ulaczyk; I. A. Bond; C. S. Botzler; A. Fukui; K. Furusawa; J. B. Hearnshaw; Y. Itow; K. Kamiya; P. M. Kilmartin; A. Korpela; W. Lin; C. H. Ling; K. Masuda; Y. Matsubara; N. Miyake; Y. Muraki; M. Nagaya; K. Ohnishi; T. Tokumura; Y. C. Perrott; N. Rattenbury; To. Saito; T. Sako; L. Skuljan; D. S. Sullivan; T. Sumi; W. L. Sweatman; P. J. Tristram; P. C. M. Yock; W. Allen; G. W. Christie; D. L. DePoy; S. Dong; B. S. Gaudi; A. Gould; C. -U. Lee; T. Natusch; B. -G. Park; R. W. Pogge; M. D. Albrow; A. Allan; V. Batista; J. P. Beaulieu; D. P. Bennett; S. Brillant; M. Bode; D. M. Bramich; M. Burgdorf; J. A. R. Caldwell; H. Calitz; A. Cassan; E. Corrales; S. Dieters; D. D. Prester; Martin Dominik; J. Donatowicz; P. Fouque; J. Greenhill; K. Hill; M. Hoffman; K. Horne; U. G. Jorgensen; N. Kains; D. Kubas; J. B. Marquette; R. Martin; P. Meintjes; J. Menzies; K. R. Pollard; K. C. Sahu; C. Snodgrass; I. Steele; R. Street; Y. Tsapras; J. Wambsganss; A. Williams; M. Zub

doi:10.1088/0004-637X/705/2/1116

INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

C. Han, K. -H. Hwang, D. Kim, A. Udalski, F. Abe, L. A. B. Monard, J. McCormick, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski, O. Szewczyk, L. Wyrzykowski, K. Ulaczyk, I. A. Bond, C. S. Botzler, A. Fukui, K. Furusawa, J. B. Hearnshaw, Y. ItowK. Kamiya, P. M. Kilmartin, A. Korpela, W. Lin, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Ohnishi, T. Tokumura, Y. C. Perrott, N. Rattenbury, To. Saito, T. Sako, L. Skuljan, D. S. Sullivan, T. Sumi, W. L. Sweatman, P. J. Tristram, P. C. M. Yock, W. Allen, G. W. Christie, D. L. DePoy, S. Dong, B. S. Gaudi, A. Gould, C. -U. Lee, T. Natusch, B. -G. Park, R. W. Pogge, M. D. Albrow, A. Allan, V. Batista, J. P. Beaulieu, D. P. Bennett, S. Brillant, M. Bode, D. M. Bramich, M. Burgdorf, J. A. R. Caldwell, H. Calitz, A. Cassan, E. Corrales, S. Dieters, D. D. Prester, Martin Dominik, J. Donatowicz, P. Fouque, J. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jorgensen, N. Kains, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, R. Street, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub

School of Physics and Astronomy

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

Abstract

To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007- BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.

Original language	English
Pages (from-to)	1116-1121
Number of pages	6
Journal	Astrophysical Journal
Volume	705
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/705/2/1116
Publication status	Published - 10 Nov 2009

Keywords

gravitational lensing
planetary systems
PLANETARY SYSTEMS
EARTH MASS
DEGENERACY
CAUSTICS
HUNT
LENS

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10.1088/0004-637X/705/2/1116

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Han, C., Hwang, K. .-H., Kim, D., Udalski, A., Abe, F., Monard, L. A. B., McCormick, J., Szymanski, M. K., Kubiak, M., Pietrzynski, G., Soszynski, I., Szewczyk, O., Wyrzykowski, L., Ulaczyk, K., Bond, I. A., Botzler, C. S., Fukui, A., Furusawa, K., Hearnshaw, J. B., ... Zub, M. (2009). INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS. Astrophysical Journal, 705(2), 1116-1121. https://doi.org/10.1088/0004-637X/705/2/1116

@article{a2007e039c3d4163a863fca6d4b5c4d2,

title = "INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS",

abstract = "To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007- BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.",

keywords = "gravitational lensing, planetary systems, PLANETARY SYSTEMS, EARTH MASS, DEGENERACY, CAUSTICS, HUNT, LENS",

author = "C. Han and Hwang, {K. -H.} and D. Kim and A. Udalski and F. Abe and Monard, {L. A. B.} and J. McCormick and Szymanski, {M. K.} and M. Kubiak and G. Pietrzynski and I. Soszynski and O. Szewczyk and L. Wyrzykowski and K. Ulaczyk and Bond, {I. A.} and Botzler, {C. S.} and A. Fukui and K. Furusawa and Hearnshaw, {J. B.} and Y. Itow and K. Kamiya and Kilmartin, {P. M.} and A. Korpela and W. Lin and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and K. Ohnishi and T. Tokumura and Perrott, {Y. C.} and N. Rattenbury and To. Saito and T. Sako and L. Skuljan and Sullivan, {D. S.} and T. Sumi and Sweatman, {W. L.} and Tristram, {P. J.} and Yock, {P. C. M.} and W. Allen and Christie, {G. W.} and DePoy, {D. L.} and S. Dong and Gaudi, {B. S.} and A. Gould and Lee, {C. -U.} and T. Natusch and Park, {B. -G.} and Pogge, {R. W.} and Albrow, {M. D.} and A. Allan and V. Batista and Beaulieu, {J. P.} and Bennett, {D. P.} and S. Brillant and M. Bode and Bramich, {D. M.} and M. Burgdorf and Caldwell, {J. A. R.} and H. Calitz and A. Cassan and E. Corrales and S. Dieters and Prester, {D. D.} and Martin Dominik and J. Donatowicz and P. Fouque and J. Greenhill and K. Hill and M. Hoffman and K. Horne and Jorgensen, {U. G.} and N. Kains and D. Kubas and Marquette, {J. B.} and R. Martin and P. Meintjes and J. Menzies and Pollard, {K. R.} and Sahu, {K. C.} and C. Snodgrass and I. Steele and R. Street and Y. Tsapras and J. Wambsganss and A. Williams and M. Zub",

year = "2009",

month = nov,

day = "10",

doi = "10.1088/0004-637X/705/2/1116",

language = "English",

volume = "705",

pages = "1116--1121",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Han, C, Hwang, K-H, Kim, D, Udalski, A, Abe, F, Monard, LAB, McCormick, J, Szymanski, MK, Kubiak, M, Pietrzynski, G, Soszynski, I, Szewczyk, O, Wyrzykowski, L, Ulaczyk, K, Bond, IA, Botzler, CS, Fukui, A, Furusawa, K, Hearnshaw, JB, Itow, Y, Kamiya, K, Kilmartin, PM, Korpela, A, Lin, W, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Nagaya, M, Ohnishi, K, Tokumura, T, Perrott, YC, Rattenbury, N, Saito, T, Sako, T, Skuljan, L, Sullivan, DS, Sumi, T, Sweatman, WL, Tristram, PJ, Yock, PCM, Allen, W, Christie, GW, DePoy, DL, Dong, S, Gaudi, BS, Gould, A, Lee, C-U, Natusch, T, Park, B-G, Pogge, RW, Albrow, MD, Allan, A, Batista, V, Beaulieu, JP, Bennett, DP, Brillant, S, Bode, M, Bramich, DM, Burgdorf, M, Caldwell, JAR, Calitz, H, Cassan, A, Corrales, E, Dieters, S, Prester, DD, Dominik, M, Donatowicz, J, Fouque, P, Greenhill, J, Hill, K, Hoffman, M, Horne, K, Jorgensen, UG, Kains, N, Kubas, D, Marquette, JB, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, Sahu, KC, Snodgrass, C, Steele, I, Street, R, Tsapras, Y, Wambsganss, J, Williams, A & Zub, M 2009, 'INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS', Astrophysical Journal, vol. 705, no. 2, pp. 1116-1121. https://doi.org/10.1088/0004-637X/705/2/1116

TY - JOUR

T1 - INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

AU - Han, C.

AU - Hwang, K. -H.

AU - Kim, D.

AU - Udalski, A.

AU - Abe, F.

AU - Monard, L. A. B.

AU - McCormick, J.

AU - Szymanski, M. K.

AU - Kubiak, M.

AU - Pietrzynski, G.

AU - Soszynski, I.

AU - Szewczyk, O.

AU - Wyrzykowski, L.

AU - Ulaczyk, K.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Fukui, A.

AU - Furusawa, K.

AU - Hearnshaw, J. B.

AU - Itow, Y.

AU - Kamiya, K.

AU - Kilmartin, P. M.

AU - Korpela, A.

AU - Lin, W.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Nagaya, M.

AU - Ohnishi, K.

AU - Tokumura, T.

AU - Perrott, Y. C.

AU - Rattenbury, N.

AU - Saito, To.

AU - Sako, T.

AU - Skuljan, L.

AU - Sullivan, D. S.

AU - Sumi, T.

AU - Sweatman, W. L.

AU - Tristram, P. J.

AU - Yock, P. C. M.

AU - Allen, W.

AU - Christie, G. W.

AU - DePoy, D. L.

AU - Dong, S.

AU - Gaudi, B. S.

AU - Gould, A.

AU - Lee, C. -U.

AU - Natusch, T.

AU - Park, B. -G.

AU - Pogge, R. W.

AU - Albrow, M. D.

AU - Allan, A.

AU - Batista, V.

AU - Beaulieu, J. P.

AU - Bennett, D. P.

AU - Brillant, S.

AU - Bode, M.

AU - Bramich, D. M.

AU - Burgdorf, M.

AU - Caldwell, J. A. R.

AU - Calitz, H.

AU - Cassan, A.

AU - Corrales, E.

AU - Dieters, S.

AU - Prester, D. D.

AU - Dominik, Martin

AU - Donatowicz, J.

AU - Fouque, P.

AU - Greenhill, J.

AU - Hill, K.

AU - Hoffman, M.

AU - Horne, K.

AU - Jorgensen, U. G.

AU - Kains, N.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Snodgrass, C.

AU - Steele, I.

AU - Street, R.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Williams, A.

AU - Zub, M.

PY - 2009/11/10

Y1 - 2009/11/10

N2 - To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007- BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.

AB - To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007- BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations.

KW - gravitational lensing

KW - planetary systems

KW - PLANETARY SYSTEMS

KW - EARTH MASS

KW - DEGENERACY

KW - CAUSTICS

KW - HUNT

KW - LENS

UR - http://www.scopus.com/inward/record.url?scp=70450200209&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/705/2/1116

DO - 10.1088/0004-637X/705/2/1116

M3 - Article

SN - 0004-637X

VL - 705

SP - 1116

EP - 1121

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

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Keywords

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INTERPRETATION OF STRONG SHORT-TERM CENTRAL PERTURBATIONS IN THE LIGHT CURVES OF MODERATE-MAGNIFICATION MICROLENSING EVENTS

Abstract

Keywords

Access to Document

Other files and links

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Projects

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089

Astrophysics at St Andrews: Astrophysics at St.Andrews

Cite this