Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events

I. G. Shin, C. Han, J. Y. Choi, A. Udalski, T. Sumi, A. Gould, V. Bozza, M. Dominik, P. Fouqué, K. Horne, M. K. Szymański, M. Kubiak, I. Soszyński, G. Pietrzyński, R. Poleski, K. Ulaczyk, P. Pietrukowicz, S. Kozłowski, J. Skowron, WyrzykowskiF. Abe, D. P. Bennett, I. A. Bond, C. S. Botzler, P. Chote, M. Freeman, A. Fukui, K. Furusawa, Y. Itow, S. Kobara, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, K. Ohmori, K. Ohnishi, N. J. Rattenbury, To Saito, D. J. Sullivan, D. Suzuki, K. Suzuki, W. L. Sweatman, S. Takino, P. J. Tristram, K. Wada, P. C M Yock, D. M. Bramich, C. Snodgrass, I. A. Steele, R. A. Street, Y. Tsapras, Khalid Al-Subai, P. Browne, M. J. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, X. S. Fang, F. Grundahl, C. H. Gu, S. Hardis, K. Harpsoe, T. C. Hinse, A. Hornstrup, M. Hundertmark, J. Jessen-Hansen, U. G. Jorgensen, N. Kains, E. Kerins, C. Liebig, M. Lund, M. Lunkkvist, L. Mancini, M. Mathiasen, M. T. Penny, S. Rahvar, D. Ricci, G. Scarpetta, J. Skottfelt, J. Southworth, J. Surdej, J. Tregloan-Reed, J. Wambsganss, O. Wertz, L. A. Almeida, V. Batista, G. Christie, D. L. Depoy, Subo Dong, B. S. Gaudi, C. Henderson, F. Jablonski, C. U. Lee, J. McCormick, D. McGregor, D. Moorhouse, T. Natusch, H. Ngan, S. Y. Park, R. W. Pogge, T. G. Tan, G. Thornley, J. C. Yee, M. D. Albrow, E. Bachelet, J. P. Beaulieu, S. Brillant, A. Cassan, A. A. Cole, E. Corrales, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, J. Greenhill, D. Kubas, J. B. Marquette, J. W. Menzies, K. C. Sahu, And M. Zub

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43 M and 0.39 M for MOA-2011-BLG-090 and 0.57 M and 0.17 M for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.

Original languageEnglish
Article number91
JournalAstrophysical Journal
Volume755
Issue number2
DOIs
Publication statusPublished - 20 Aug 2012

Fingerprint

alkalies
lenses
timescale
light curve
orbitals
parallax
binary stars
radial velocity
astrophysics
parameter
radii
modeling
detection

Keywords

  • binaries: general
  • gravitational lensing: micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events. / Shin, I. G.; Han, C.; Choi, J. Y.; Udalski, A.; Sumi, T.; Gould, A.; Bozza, V.; Dominik, M.; Fouqué, P.; Horne, K.; Szymański, M. K.; Kubiak, M.; Soszyński, I.; Pietrzyński, G.; Poleski, R.; Ulaczyk, K.; Pietrukowicz, P.; Kozłowski, S.; Skowron, J.; Wyrzykowski; Abe, F.; Bennett, D. P.; Bond, I. A.; Botzler, C. S.; Chote, P.; Freeman, M.; Fukui, A.; Furusawa, K.; Itow, Y.; Kobara, S.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Ohmori, K.; Ohnishi, K.; Rattenbury, N. J.; Saito, To; Sullivan, D. J.; Suzuki, D.; Suzuki, K.; Sweatman, W. L.; Takino, S.; Tristram, P. J.; Wada, K.; Yock, P. C M; Bramich, D. M.; Snodgrass, C.; Steele, I. A.; Street, R. A.; Tsapras, Y.; Al-Subai, Khalid; Browne, P.; Burgdorf, M. J.; Novati, S. Calchi; Dodds, P.; Dreizler, S.; Fang, X. S.; Grundahl, F.; Gu, C. H.; Hardis, S.; Harpsoe, K.; Hinse, T. C.; Hornstrup, A.; Hundertmark, M.; Jessen-Hansen, J.; Jorgensen, U. G.; Kains, N.; Kerins, E.; Liebig, C.; Lund, M.; Lunkkvist, M.; Mancini, L.; Mathiasen, M.; Penny, M. T.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Skottfelt, J.; Southworth, J.; Surdej, J.; Tregloan-Reed, J.; Wambsganss, J.; Wertz, O.; Almeida, L. A.; Batista, V.; Christie, G.; Depoy, D. L.; Dong, Subo; Gaudi, B. S.; Henderson, C.; Jablonski, F.; Lee, C. U.; McCormick, J.; McGregor, D.; Moorhouse, D.; Natusch, T.; Ngan, H.; Park, S. Y.; Pogge, R. W.; Tan, T. G.; Thornley, G.; Yee, J. C.; Albrow, M. D.; Bachelet, E.; Beaulieu, J. P.; Brillant, S.; Cassan, A.; Cole, A. A.; Corrales, E.; Coutures, C.; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Greenhill, J.; Kubas, D.; Marquette, J. B.; Menzies, J. W.; Sahu, K. C.; Zub, And M.

In: Astrophysical Journal, Vol. 755, No. 2, 91, 20.08.2012.

Research output: Contribution to journalArticle

Shin, IG, Han, C, Choi, JY, Udalski, A, Sumi, T, Gould, A, Bozza, V, Dominik, M, Fouqué, P, Horne, K, Szymański, MK, Kubiak, M, Soszyński, I, Pietrzyński, G, Poleski, R, Ulaczyk, K, Pietrukowicz, P, Kozłowski, S, Skowron, J, Wyrzykowski, Abe, F, Bennett, DP, Bond, IA, Botzler, CS, Chote, P, Freeman, M, Fukui, A, Furusawa, K, Itow, Y, Kobara, S, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Ohmori, K, Ohnishi, K, Rattenbury, NJ, Saito, T, Sullivan, DJ, Suzuki, D, Suzuki, K, Sweatman, WL, Takino, S, Tristram, PJ, Wada, K, Yock, PCM, Bramich, DM, Snodgrass, C, Steele, IA, Street, RA, Tsapras, Y, Al-Subai, K, Browne, P, Burgdorf, MJ, Novati, SC, Dodds, P, Dreizler, S, Fang, XS, Grundahl, F, Gu, CH, Hardis, S, Harpsoe, K, Hinse, TC, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Jorgensen, UG, Kains, N, Kerins, E, Liebig, C, Lund, M, Lunkkvist, M, Mancini, L, Mathiasen, M, Penny, MT, Rahvar, S, Ricci, D, Scarpetta, G, Skottfelt, J, Southworth, J, Surdej, J, Tregloan-Reed, J, Wambsganss, J, Wertz, O, Almeida, LA, Batista, V, Christie, G, Depoy, DL, Dong, S, Gaudi, BS, Henderson, C, Jablonski, F, Lee, CU, McCormick, J, McGregor, D, Moorhouse, D, Natusch, T, Ngan, H, Park, SY, Pogge, RW, Tan, TG, Thornley, G, Yee, JC, Albrow, MD, Bachelet, E, Beaulieu, JP, Brillant, S, Cassan, A, Cole, AA, Corrales, E, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Greenhill, J, Kubas, D, Marquette, JB, Menzies, JW, Sahu, KC & Zub, AM 2012, 'Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events', Astrophysical Journal, vol. 755, no. 2, 91. https://doi.org/10.1088/0004-637X/755/2/91
Shin, I. G. ; Han, C. ; Choi, J. Y. ; Udalski, A. ; Sumi, T. ; Gould, A. ; Bozza, V. ; Dominik, M. ; Fouqué, P. ; Horne, K. ; Szymański, M. K. ; Kubiak, M. ; Soszyński, I. ; Pietrzyński, G. ; Poleski, R. ; Ulaczyk, K. ; Pietrukowicz, P. ; Kozłowski, S. ; Skowron, J. ; Wyrzykowski ; Abe, F. ; Bennett, D. P. ; Bond, I. A. ; Botzler, C. S. ; Chote, P. ; Freeman, M. ; Fukui, A. ; Furusawa, K. ; Itow, Y. ; Kobara, S. ; Ling, C. H. ; Masuda, K. ; Matsubara, Y. ; Miyake, N. ; Muraki, Y. ; Ohmori, K. ; Ohnishi, K. ; Rattenbury, N. J. ; Saito, To ; Sullivan, D. J. ; Suzuki, D. ; Suzuki, K. ; Sweatman, W. L. ; Takino, S. ; Tristram, P. J. ; Wada, K. ; Yock, P. C M ; Bramich, D. M. ; Snodgrass, C. ; Steele, I. A. ; Street, R. A. ; Tsapras, Y. ; Al-Subai, Khalid ; Browne, P. ; Burgdorf, M. J. ; Novati, S. Calchi ; Dodds, P. ; Dreizler, S. ; Fang, X. S. ; Grundahl, F. ; Gu, C. H. ; Hardis, S. ; Harpsoe, K. ; Hinse, T. C. ; Hornstrup, A. ; Hundertmark, M. ; Jessen-Hansen, J. ; Jorgensen, U. G. ; Kains, N. ; Kerins, E. ; Liebig, C. ; Lund, M. ; Lunkkvist, M. ; Mancini, L. ; Mathiasen, M. ; Penny, M. T. ; Rahvar, S. ; Ricci, D. ; Scarpetta, G. ; Skottfelt, J. ; Southworth, J. ; Surdej, J. ; Tregloan-Reed, J. ; Wambsganss, J. ; Wertz, O. ; Almeida, L. A. ; Batista, V. ; Christie, G. ; Depoy, D. L. ; Dong, Subo ; Gaudi, B. S. ; Henderson, C. ; Jablonski, F. ; Lee, C. U. ; McCormick, J. ; McGregor, D. ; Moorhouse, D. ; Natusch, T. ; Ngan, H. ; Park, S. Y. ; Pogge, R. W. ; Tan, T. G. ; Thornley, G. ; Yee, J. C. ; Albrow, M. D. ; Bachelet, E. ; Beaulieu, J. P. ; Brillant, S. ; Cassan, A. ; Cole, A. A. ; Corrales, E. ; Coutures, C. ; Dieters, S. ; Prester, D. Dominis ; Donatowicz, J. ; Greenhill, J. ; Kubas, D. ; Marquette, J. B. ; Menzies, J. W. ; Sahu, K. C. ; Zub, And M. / Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events. In: Astrophysical Journal. 2012 ; Vol. 755, No. 2.
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abstract = "Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43 M and 0.39 M for MOA-2011-BLG-090 and 0.57 M and 0.17 M for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.",
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T1 - Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events

AU - Shin, I. G.

AU - Han, C.

AU - Choi, J. Y.

AU - Udalski, A.

AU - Sumi, T.

AU - Gould, A.

AU - Bozza, V.

AU - Dominik, M.

AU - Fouqué, P.

AU - Horne, K.

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 - Abe, F.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Chote, P.

AU - Freeman, M.

AU - Fukui, A.

AU - Furusawa, K.

AU - Itow, Y.

AU - Kobara, S.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Ohmori, K.

AU - Ohnishi, K.

AU - Rattenbury, N. J.

AU - Saito, To

AU - Sullivan, D. J.

AU - Suzuki, D.

AU - Suzuki, K.

AU - Sweatman, W. L.

AU - Takino, S.

AU - Tristram, P. J.

AU - Wada, K.

AU - Yock, P. C M

AU - Bramich, D. M.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Street, R. A.

AU - Tsapras, Y.

AU - Al-Subai, Khalid

AU - Browne, P.

AU - Burgdorf, M. J.

AU - Novati, S. Calchi

AU - Dodds, P.

AU - Dreizler, S.

AU - Fang, X. S.

AU - Grundahl, F.

AU - Gu, C. H.

AU - Hardis, S.

AU - Harpsoe, K.

AU - Hinse, T. C.

AU - Hornstrup, A.

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Jorgensen, U. G.

AU - Kains, N.

AU - Kerins, E.

AU - Liebig, C.

AU - Lund, M.

AU - Lunkkvist, M.

AU - Mancini, L.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Rahvar, S.

AU - Ricci, D.

AU - Scarpetta, G.

AU - Skottfelt, J.

AU - Southworth, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wambsganss, J.

AU - Wertz, O.

AU - Almeida, L. A.

AU - Batista, V.

AU - Christie, G.

AU - Depoy, D. L.

AU - Dong, Subo

AU - Gaudi, B. S.

AU - Henderson, C.

AU - Jablonski, F.

AU - Lee, C. U.

AU - McCormick, J.

AU - McGregor, D.

AU - Moorhouse, D.

AU - Natusch, T.

AU - Ngan, H.

AU - Park, S. Y.

AU - Pogge, R. W.

AU - Tan, T. G.

AU - Thornley, G.

AU - Yee, J. C.

AU - Albrow, M. D.

AU - Bachelet, E.

AU - Beaulieu, J. P.

AU - Brillant, S.

AU - Cassan, A.

AU - Cole, A. A.

AU - Corrales, E.

AU - Coutures, C.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Greenhill, J.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Menzies, J. W.

AU - Sahu, K. C.

AU - Zub, And M.

PY - 2012/8/20

Y1 - 2012/8/20

N2 - Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43 M and 0.39 M for MOA-2011-BLG-090 and 0.57 M and 0.17 M for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.

AB - Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43 M and 0.39 M for MOA-2011-BLG-090 and 0.57 M and 0.17 M for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.

KW - binaries: general

KW - gravitational lensing: micro

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