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. Fouqué, M. Kubiak, M. K. Szymański, G. Pietrzyńki, I. Soszyński, 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 & 37 others 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. Jörgensen, 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

Research output: Contribution to journalArticle

23 Citations (Scopus)

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 and 0.5 0.1 M 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 languageEnglish
Article number85
JournalAstrophysical Journal
Volume735
Issue number2
DOIs
Publication statusPublished - 10 Jul 2011
Externally publishedYes

Fingerprint

light curve
lenses
orbitals
orbits
deviation
galactic bulge
parallax
model test
parameter
modeling
effect

Keywords

  • binaries: general
  • gravitational lensing: micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Shin, I. G., Udalski, A., Han, C., Gould, A., Dominik, M., Fouqué, P., ... Woller, K. (2011). OGLE-2005-BLG-018: Characterization of full physical and orbital parameters of a gravitational binary lens. Astrophysical Journal, 735(2), [85]. https://doi.org/10.1088/0004-637X/735/2/85

OGLE-2005-BLG-018 : Characterization of full physical and orbital parameters of a gravitational binary lens. / Shin, I. G.; Udalski, A.; Han, C.; Gould, A.; Dominik, M.; Fouqué, P.; Kubiak, M.; Szymański, M. K.; Pietrzyńki, G.; Soszyński, 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.; Allan, A.; Beaulieu, J. P.; Bennett, D. P.; Bode, M.; Bramich, D. M.; Brillant, S.; Burgdorf, M.; Calitz, H.; Cassan, A.; Cook, K. H.; Corrales, E.; Coutures, Ch; Desort, N.; Dieters, S.; Dominis Prester, D.; Donatowicz, J.; Fraser, S. N.; Greenhill, J.; Hill, K.; Hoffman, M.; Horne, K.; Jörgensen, U. G.; Kane, S. R.; Kubas, D.; Marquette, J. B.; Martin, R.; Meintjes, P.; Menzies, J.; Mottram, C.; Naylor, T.; Pollard, K. R.; Sahu, K. C.; Snodgrass, C.; Steele, I.; Vinter, C.; Wambsganss, J.; Williams, A.; Woller, K.

In: Astrophysical Journal, Vol. 735, No. 2, 85, 10.07.2011.

Research output: Contribution to journalArticle

Shin, IG, Udalski, A, Han, C, Gould, A, Dominik, M, Fouqué, P, Kubiak, M, Szymański, MK, Pietrzyńki, G, Soszyński, I, Ulaczyk, K, Wyrzykowski, L, Depoy, DL, Dong, S, Gaudi, BS, Lee, CU, Park, BG, 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, Dominis Prester, D, Donatowicz, J, Fraser, SN, Greenhill, J, Hill, K, Hoffman, M, Horne, K, Jörgensen, 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
Shin, I. G. ; Udalski, A. ; Han, C. ; Gould, A. ; Dominik, M. ; Fouqué, P. ; Kubiak, M. ; Szymański, M. K. ; Pietrzyńki, G. ; Soszyński, 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. ; Allan, A. ; Beaulieu, J. P. ; Bennett, D. P. ; Bode, M. ; Bramich, D. M. ; Brillant, S. ; Burgdorf, M. ; Calitz, H. ; Cassan, A. ; Cook, K. H. ; Corrales, E. ; Coutures, Ch ; Desort, N. ; Dieters, S. ; Dominis Prester, D. ; Donatowicz, J. ; Fraser, S. N. ; Greenhill, J. ; Hill, K. ; Hoffman, M. ; Horne, K. ; Jörgensen, U. G. ; Kane, S. R. ; Kubas, D. ; Marquette, J. B. ; Martin, R. ; Meintjes, P. ; Menzies, J. ; Mottram, C. ; Naylor, T. ; Pollard, K. R. ; Sahu, K. C. ; Snodgrass, C. ; Steele, I. ; Vinter, C. ; Wambsganss, J. ; Williams, A. ; Woller, K. / OGLE-2005-BLG-018 : Characterization of full physical and orbital parameters of a gravitational binary lens. In: Astrophysical Journal. 2011 ; Vol. 735, No. 2.
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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 and 0.5 0.1 M ⊙ 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.",
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T1 - OGLE-2005-BLG-018

T2 - 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 - Fouqué, P.

AU - Kubiak, M.

AU - Szymański, M. K.

AU - Pietrzyńki, G.

AU - Soszyński, 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 - Dominis Prester, D.

AU - Donatowicz, J.

AU - Fraser, S. N.

AU - Greenhill, J.

AU - Hill, K.

AU - Hoffman, M.

AU - Horne, K.

AU - Jörgensen, 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 and 0.5 0.1 M ⊙ 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 and 0.5 0.1 M ⊙ 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

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