Gravitational binary-lens events with prominent effects of lens orbital motion

H. Park, A. Udalski, C. Han, A. Gould, J. P. Beaulieu, Y. Tsapras, M. K. Szymański, M. Kubiak, I. Soszyński, G. Pietrzyński, R. Poleski, K. Ulaczyk, P. Pietrukowicz, S. Kozłowski, J. Skowron, Wyrzykowski, J. Y. Choi, D. L. Depoy, Subo Dong, B. S. Gaudi & 41 others K. H. Hwang, Y. K. Jung, A. Kavka, C. U. Lee, L. A G Monard, B. G. Park, R. W. Pogge, I. Porritt, I. G. Shin, J. C. Yee, M. D. Albrow, D. P. Bennett, J. A R Caldwell, A. Cassan, C. Coutures, D. Dominis, J. Donatowicz, P. Fouqué, J. Greenhill, M. Huber, U. G. Jørgensen, S. Kane, D. Kubas, J. B. Marquette, J. Menzies, C. Pitrou, K. R. Pollard, K. C. Sahu, J. Wambsganss, A. Williams, M. Zub, A. Allan, D. M. Bramich, P. Browne, M. Dominik, K. Horne, M. Hundertmark, N. Kains, C. Snodgrass, I. A. Steele, R. A. Street

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel for determining physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events, OGLE-2006-BLG-277 and OGLE-2012-BLG-0031, for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion.

Original languageEnglish
Article number134
JournalAstrophysical Journal
Volume778
Issue number2
DOIs
Publication statusPublished - 1 Dec 2013
Externally publishedYes

Fingerprint

lenses
orbits
light curve
orbitals
modeling
effect
deviation
parallax
stars
parameter

Keywords

  • binaries: general
  • gravitational lensing: micro
  • planets and satellites: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Park, H., Udalski, A., Han, C., Gould, A., Beaulieu, J. P., Tsapras, Y., ... Street, R. A. (2013). Gravitational binary-lens events with prominent effects of lens orbital motion. Astrophysical Journal, 778(2), [134]. https://doi.org/10.1088/0004-637X/778/2/134

Gravitational binary-lens events with prominent effects of lens orbital motion. / Park, H.; Udalski, A.; Han, C.; Gould, A.; Beaulieu, J. P.; Tsapras, Y.; Szymański, M. K.; Kubiak, M.; Soszyński, I.; Pietrzyński, G.; Poleski, R.; Ulaczyk, K.; Pietrukowicz, P.; Kozłowski, S.; Skowron, J.; Wyrzykowski; Choi, J. Y.; Depoy, D. L.; Dong, Subo; Gaudi, B. S.; Hwang, K. H.; Jung, Y. K.; Kavka, A.; Lee, C. U.; Monard, L. A G; Park, B. G.; Pogge, R. W.; Porritt, I.; Shin, I. G.; Yee, J. C.; Albrow, M. D.; Bennett, D. P.; Caldwell, J. A R; Cassan, A.; Coutures, C.; Dominis, D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Huber, M.; Jørgensen, U. G.; Kane, S.; Kubas, D.; Marquette, J. B.; Menzies, J.; Pitrou, C.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Williams, A.; Zub, M.; Allan, A.; Bramich, D. M.; Browne, P.; Dominik, M.; Horne, K.; Hundertmark, M.; Kains, N.; Snodgrass, C.; Steele, I. A.; Street, R. A.

In: Astrophysical Journal, Vol. 778, No. 2, 134, 01.12.2013.

Research output: Contribution to journalArticle

Park, H, Udalski, A, Han, C, Gould, A, Beaulieu, JP, Tsapras, Y, Szymański, MK, Kubiak, M, Soszyński, I, Pietrzyński, G, Poleski, R, Ulaczyk, K, Pietrukowicz, P, Kozłowski, S, Skowron, J, Wyrzykowski, Choi, JY, Depoy, DL, Dong, S, Gaudi, BS, Hwang, KH, Jung, YK, Kavka, A, Lee, CU, Monard, LAG, Park, BG, Pogge, RW, Porritt, I, Shin, IG, Yee, JC, Albrow, MD, Bennett, DP, Caldwell, JAR, Cassan, A, Coutures, C, Dominis, D, Donatowicz, J, Fouqué, P, Greenhill, J, Huber, M, Jørgensen, UG, Kane, S, Kubas, D, Marquette, JB, Menzies, J, Pitrou, C, Pollard, KR, Sahu, KC, Wambsganss, J, Williams, A, Zub, M, Allan, A, Bramich, DM, Browne, P, Dominik, M, Horne, K, Hundertmark, M, Kains, N, Snodgrass, C, Steele, IA & Street, RA 2013, 'Gravitational binary-lens events with prominent effects of lens orbital motion', Astrophysical Journal, vol. 778, no. 2, 134. https://doi.org/10.1088/0004-637X/778/2/134
Park, H. ; Udalski, A. ; Han, C. ; Gould, A. ; Beaulieu, J. P. ; Tsapras, Y. ; Szymański, M. K. ; Kubiak, M. ; Soszyński, I. ; Pietrzyński, G. ; Poleski, R. ; Ulaczyk, K. ; Pietrukowicz, P. ; Kozłowski, S. ; Skowron, J. ; Wyrzykowski ; Choi, J. Y. ; Depoy, D. L. ; Dong, Subo ; Gaudi, B. S. ; Hwang, K. H. ; Jung, Y. K. ; Kavka, A. ; Lee, C. U. ; Monard, L. A G ; Park, B. G. ; Pogge, R. W. ; Porritt, I. ; Shin, I. G. ; Yee, J. C. ; Albrow, M. D. ; Bennett, D. P. ; Caldwell, J. A R ; Cassan, A. ; Coutures, C. ; Dominis, D. ; Donatowicz, J. ; Fouqué, P. ; Greenhill, J. ; Huber, M. ; Jørgensen, U. G. ; Kane, S. ; Kubas, D. ; Marquette, J. B. ; Menzies, J. ; Pitrou, C. ; Pollard, K. R. ; Sahu, K. C. ; Wambsganss, J. ; Williams, A. ; Zub, M. ; Allan, A. ; Bramich, D. M. ; Browne, P. ; Dominik, M. ; Horne, K. ; Hundertmark, M. ; Kains, N. ; Snodgrass, C. ; Steele, I. A. ; Street, R. A. / Gravitational binary-lens events with prominent effects of lens orbital motion. In: Astrophysical Journal. 2013 ; Vol. 778, No. 2.
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abstract = "Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel for determining physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events, OGLE-2006-BLG-277 and OGLE-2012-BLG-0031, for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion.",
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AU - Udalski, A.

AU - Han, C.

AU - Gould, A.

AU - Beaulieu, J. P.

AU - Tsapras, Y.

AU - Szymański, M. K.

AU - Kubiak, M.

AU - Soszyński, I.

AU - Pietrzyński, G.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Pietrukowicz, P.

AU - Kozłowski, S.

AU - Skowron, J.

AU - Wyrzykowski,

AU - Choi, J. Y.

AU - Depoy, D. L.

AU - Dong, Subo

AU - Gaudi, B. S.

AU - Hwang, K. H.

AU - Jung, Y. K.

AU - Kavka, A.

AU - Lee, C. U.

AU - Monard, L. A G

AU - Park, B. G.

AU - Pogge, R. W.

AU - Porritt, I.

AU - Shin, I. G.

AU - Yee, J. C.

AU - Albrow, M. D.

AU - Bennett, D. P.

AU - Caldwell, J. A R

AU - Cassan, A.

AU - Coutures, C.

AU - Dominis, D.

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Huber, M.

AU - Jørgensen, U. G.

AU - Kane, S.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Menzies, J.

AU - Pitrou, C.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Zub, M.

AU - Allan, A.

AU - Bramich, D. M.

AU - Browne, P.

AU - Dominik, M.

AU - Horne, K.

AU - Hundertmark, M.

AU - Kains, N.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Street, R. A.

PY - 2013/12/1

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N2 - Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel for determining physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events, OGLE-2006-BLG-277 and OGLE-2012-BLG-0031, for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion.

AB - Gravitational microlensing events produced by lenses composed of binary masses are important because they provide a major channel for determining physical parameters of lenses. In this work, we analyze the light curves of two binary-lens events, OGLE-2006-BLG-277 and OGLE-2012-BLG-0031, for which the light curves exhibit strong deviations from standard models. From modeling considering various second-order effects, we find that the deviations are mostly explained by the effect of the lens orbital motion. We also find that lens parallax effects can mimic orbital effects to some extent. This implies that modeling light curves of binary-lens events not considering orbital effects can result in lens parallaxes that are substantially different from actual values and thus wrong determinations of physical lens parameters. This demonstrates the importance of routine consideration of orbital effects in interpreting light curves of binary-lens events. It is found that the lens of OGLE-2006-BLG-277 is a binary composed of a low-mass star and a brown dwarf companion.

KW - binaries: general

KW - gravitational lensing: micro

KW - planets and satellites: general

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