OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS

I. -G. Shin; A. Udalski; C. Han; A. Gould; M. Dominik; P. Fouque; M. Kubiak; M. K. Szymanski; G. Pietrzynki; I. Soszynski; K. Ulaczyk; L. Wyrzykowski; D. L. DePoy; S. Dong; B. S. Gaudi; C. -U. Lee; B. -G. Park; R. W. Pogge; M. D. Albrow; A. Allan; J. P. Beaulieu; D. P. Bennett; M. Bode; D. M. Bramich; S. Brillant; M. Burgdorf; H. Calitz; A. Cassan; K. H. Cook; E. Corrales; Ch. Coutures; N. Desort; S. Dieters; D. Dominis Prester; J. Donatowicz; S. N. Fraser; J. Greenhill; K. Hill; M. Hoffman; K. Horne; U. G. Jorgensen; S. R. Kane; D. Kubas; J. B. Marquette; R. Martin; P. Meintjes; J. Menzies; C. Mottram; T. Naylor; K. R. Pollard; K. C. Sahu; C. Snodgrass; I. Steele; C. Vinter; J. Wambsganss; A. Williams; K. Woller

doi:10.1088/0004-637X/735/2/85

OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS

I. -G. Shin, A. Udalski, C. Han, A. Gould, M. Dominik, P. Fouque, M. Kubiak, M. K. Szymanski, G. Pietrzynki, I. Soszynski, K. Ulaczyk, L. Wyrzykowski, D. L. DePoy, S. Dong, B. S. Gaudi, C. -U. Lee, B. -G. Park, R. W. Pogge, M. D. Albrow, A. AllanJ. P. Beaulieu, D. P. Bennett, M. Bode, D. M. Bramich, S. Brillant, M. Burgdorf, H. Calitz, A. Cassan, K. H. Cook, E. Corrales, Ch. Coutures, N. Desort, S. Dieters, D. Dominis Prester, J. Donatowicz, S. N. Fraser, J. Greenhill, K. Hill, M. Hoffman, K. Horne, U. G. Jorgensen, S. R. Kane, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, C. Mottram, T. Naylor, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, C. Vinter, J. Wambsganss, A. Williams, K. Woller

School of Physics and Astronomy

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Abstract

We present the result of the analysis of the gravitational binary-lensing event OGLE-2005-BLG-018. The light curve of the event is characterized by two adjacent strong features and a single weak feature separated from the strong features. The light curve exhibits noticeable deviations from the best-fit model based on standard binary parameters. To explain the deviation, we test models including various higher-order effects of the motions of the observer, source, and lens. From this, we find that it is necessary to account for the orbital motion of the lens in describing the light curve. From modeling the light curve considering the parallax effect and Keplerian orbital motion, we are able to not only measure the physical parameters but also to find a complete orbital solution of the lens system. It is found that the event was produced by a binary lens located in the Galactic bulge with a distance of 6.7 +/- 0.3 kpc from the Earth. The individual lens components with masses 0.9 +/- 0.3 M-circle dot and 0.5 +/- 0.1 M-circle dot are separated with a semi-major axis of a = 2.5 +/- 1.0 AU and orbiting each other with a period P = 3.1 +/- 1.3 yr. This event demonstrates that it is possible to extract detailed information about binary lens systems from well-resolved lensing light curves.

Original language	English
Article number	85
Number of pages	8
Journal	Astrophysical Journal
Volume	735
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/735/2/85
Publication status	Published - 10 Jul 2011

Keywords

binaries: general
gravitational lensing: micro
MICROLENSING EVENTS
JUPITER/SATURN ANALOG
MAGELLANIC CLOUDS
MASS PLANET
OGLE VIEW
DISCOVERY
STARS
ROTATION
SYSTEMS
COMMON

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10.1088/0004-637X/735/2/85

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089
Bonnell, I. A. (PI), Cameron, A. C. (CoI), Dominik, M. (CoI), Driver, S. P. (CoI), Greaves, J. S. (CoI), Horne, K. D. (CoI), Jardine, M. M. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
Science & Technology Facilities Council
1/04/09 → 31/03/12
Project: Standard

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Shin, I. .-G., Udalski, A., Han, C., Gould, A., Dominik, M., Fouque, P., Kubiak, M., Szymanski, M. K., Pietrzynki, G., Soszynski, I., Ulaczyk, K., Wyrzykowski, L., DePoy, D. L., Dong, S., Gaudi, B. S., Lee, C. .-U., Park, B. .-G., Pogge, R. W., Albrow, M. D., ... Woller, K. (2011). OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS. Astrophysical Journal, 735(2), Article 85. https://doi.org/10.1088/0004-637X/735/2/85

@article{461f7ea78fc5472da43dbdceebccc379,

title = "OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS",

abstract = "We present the result of the analysis of the gravitational binary-lensing event OGLE-2005-BLG-018. The light curve of the event is characterized by two adjacent strong features and a single weak feature separated from the strong features. The light curve exhibits noticeable deviations from the best-fit model based on standard binary parameters. To explain the deviation, we test models including various higher-order effects of the motions of the observer, source, and lens. From this, we find that it is necessary to account for the orbital motion of the lens in describing the light curve. From modeling the light curve considering the parallax effect and Keplerian orbital motion, we are able to not only measure the physical parameters but also to find a complete orbital solution of the lens system. It is found that the event was produced by a binary lens located in the Galactic bulge with a distance of 6.7 +/- 0.3 kpc from the Earth. The individual lens components with masses 0.9 +/- 0.3 M-circle dot and 0.5 +/- 0.1 M-circle dot are separated with a semi-major axis of a = 2.5 +/- 1.0 AU and orbiting each other with a period P = 3.1 +/- 1.3 yr. This event demonstrates that it is possible to extract detailed information about binary lens systems from well-resolved lensing light curves.",

keywords = "binaries: general, gravitational lensing: micro, MICROLENSING EVENTS, JUPITER/SATURN ANALOG, MAGELLANIC CLOUDS, MASS PLANET, OGLE VIEW, DISCOVERY, STARS, ROTATION, SYSTEMS, COMMON",

author = "Shin, {I. -G.} and A. Udalski and C. Han and A. Gould and M. Dominik and P. Fouque and M. Kubiak and Szymanski, {M. K.} and G. Pietrzynki and I. Soszynski and K. Ulaczyk and L. Wyrzykowski and DePoy, {D. L.} and S. Dong and Gaudi, {B. S.} and Lee, {C. -U.} and Park, {B. -G.} and Pogge, {R. W.} and Albrow, {M. D.} and A. Allan and Beaulieu, {J. P.} and Bennett, {D. P.} and M. Bode and Bramich, {D. M.} and S. Brillant and M. Burgdorf and H. Calitz and A. Cassan and Cook, {K. H.} and E. Corrales and Ch. Coutures and N. Desort and S. Dieters and Prester, {D. Dominis} and J. Donatowicz and Fraser, {S. N.} and J. Greenhill and K. Hill and M. Hoffman and K. Horne and Jorgensen, {U. G.} and Kane, {S. R.} and D. Kubas and Marquette, {J. B.} and R. Martin and P. Meintjes and J. Menzies and C. Mottram and T. Naylor and Pollard, {K. R.} and Sahu, {K. C.} and C. Snodgrass and I. Steele and C. Vinter and J. Wambsganss and A. Williams and K. Woller",

year = "2011",

month = jul,

day = "10",

doi = "10.1088/0004-637X/735/2/85",

language = "English",

volume = "735",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Shin, I-G, Udalski, A, Han, C, Gould, A, Dominik, M, Fouque, P, Kubiak, M, Szymanski, MK, Pietrzynki, G, Soszynski, I, Ulaczyk, K, Wyrzykowski, L, DePoy, DL, Dong, S, Gaudi, BS, Lee, C-U, Park, B-G, Pogge, RW, Albrow, MD, Allan, A, Beaulieu, JP, Bennett, DP, Bode, M, Bramich, DM, Brillant, S, Burgdorf, M, Calitz, H, Cassan, A, Cook, KH, Corrales, E, Coutures, C, Desort, N, Dieters, S, Prester, DD, Donatowicz, J, Fraser, SN, Greenhill, J, Hill, K, Hoffman, M, Horne, K, Jorgensen, UG, Kane, SR, Kubas, D, Marquette, JB, Martin, R, Meintjes, P, Menzies, J, Mottram, C, Naylor, T, Pollard, KR, Sahu, KC, Snodgrass, C, Steele, I, Vinter, C, Wambsganss, J, Williams, A & Woller, K 2011, 'OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS', Astrophysical Journal, vol. 735, no. 2, 85. https://doi.org/10.1088/0004-637X/735/2/85

TY - JOUR

T1 - OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS

AU - Shin, I. -G.

AU - Udalski, A.

AU - Han, C.

AU - Gould, A.

AU - Dominik, M.

AU - Fouque, P.

AU - Kubiak, M.

AU - Szymanski, M. K.

AU - Pietrzynki, G.

AU - Soszynski, I.

AU - Ulaczyk, K.

AU - Wyrzykowski, L.

AU - DePoy, D. L.

AU - Dong, S.

AU - Gaudi, B. S.

AU - Lee, C. -U.

AU - Park, B. -G.

AU - Pogge, R. W.

AU - Albrow, M. D.

AU - Allan, A.

AU - Beaulieu, J. P.

AU - Bennett, D. P.

AU - Bode, M.

AU - Bramich, D. M.

AU - Brillant, S.

AU - Burgdorf, M.

AU - Calitz, H.

AU - Cassan, A.

AU - Cook, K. H.

AU - Corrales, E.

AU - Coutures, Ch.

AU - Desort, N.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Fraser, S. N.

AU - Greenhill, J.

AU - Hill, K.

AU - Hoffman, M.

AU - Horne, K.

AU - Jorgensen, U. G.

AU - Kane, S. R.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Mottram, C.

AU - Naylor, T.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Snodgrass, C.

AU - Steele, I.

AU - Vinter, C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Woller, K.

PY - 2011/7/10

Y1 - 2011/7/10

N2 - We present the result of the analysis of the gravitational binary-lensing event OGLE-2005-BLG-018. The light curve of the event is characterized by two adjacent strong features and a single weak feature separated from the strong features. The light curve exhibits noticeable deviations from the best-fit model based on standard binary parameters. To explain the deviation, we test models including various higher-order effects of the motions of the observer, source, and lens. From this, we find that it is necessary to account for the orbital motion of the lens in describing the light curve. From modeling the light curve considering the parallax effect and Keplerian orbital motion, we are able to not only measure the physical parameters but also to find a complete orbital solution of the lens system. It is found that the event was produced by a binary lens located in the Galactic bulge with a distance of 6.7 +/- 0.3 kpc from the Earth. The individual lens components with masses 0.9 +/- 0.3 M-circle dot and 0.5 +/- 0.1 M-circle dot are separated with a semi-major axis of a = 2.5 +/- 1.0 AU and orbiting each other with a period P = 3.1 +/- 1.3 yr. This event demonstrates that it is possible to extract detailed information about binary lens systems from well-resolved lensing light curves.

AB - We present the result of the analysis of the gravitational binary-lensing event OGLE-2005-BLG-018. The light curve of the event is characterized by two adjacent strong features and a single weak feature separated from the strong features. The light curve exhibits noticeable deviations from the best-fit model based on standard binary parameters. To explain the deviation, we test models including various higher-order effects of the motions of the observer, source, and lens. From this, we find that it is necessary to account for the orbital motion of the lens in describing the light curve. From modeling the light curve considering the parallax effect and Keplerian orbital motion, we are able to not only measure the physical parameters but also to find a complete orbital solution of the lens system. It is found that the event was produced by a binary lens located in the Galactic bulge with a distance of 6.7 +/- 0.3 kpc from the Earth. The individual lens components with masses 0.9 +/- 0.3 M-circle dot and 0.5 +/- 0.1 M-circle dot are separated with a semi-major axis of a = 2.5 +/- 1.0 AU and orbiting each other with a period P = 3.1 +/- 1.3 yr. This event demonstrates that it is possible to extract detailed information about binary lens systems from well-resolved lensing light curves.

KW - binaries: general

KW - gravitational lensing: micro

KW - MICROLENSING EVENTS

KW - JUPITER/SATURN ANALOG

KW - MAGELLANIC CLOUDS

KW - MASS PLANET

KW - OGLE VIEW

KW - DISCOVERY

KW - STARS

KW - ROTATION

KW - SYSTEMS

KW - COMMON

U2 - 10.1088/0004-637X/735/2/85

DO - 10.1088/0004-637X/735/2/85

M3 - Article

SN - 0004-637X

VL - 735

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 85

ER -

OGLE-2005-BLG-018: CHARACTERIZATION OF FULL PHYSICAL AND ORBITAL PARAMETERS OF A GRAVITATIONAL BINARY LENS

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Keywords

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Projects

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

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