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Frank Grundahl

Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Standard

Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events. / The OGLE Collaboration; The MOA Collaboration; The RoboNet Collaboration; The MiNDSTEp Consortium; The μFUN Collaboration; The PLANET Collaboration.

In: Astrophysical Journal, Vol. 755, No. 2, 01.08.2012, p. 91.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

The OGLE Collaboration, The MOA Collaboration, The RoboNet Collaboration, The MiNDSTEp Consortium, The μFUN Collaboration & The PLANET Collaboration 2012, 'Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events', Astrophysical Journal, vol. 755, no. 2, pp. 91. https://doi.org/10.1088/0004-637X/755/2/91

APA

The OGLE Collaboration, The MOA Collaboration, The RoboNet Collaboration, The MiNDSTEp Consortium, The μFUN Collaboration, & The PLANET Collaboration (2012). Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events. Astrophysical Journal, 755(2), 91. https://doi.org/10.1088/0004-637X/755/2/91

CBE

The OGLE Collaboration, The MOA Collaboration, The RoboNet Collaboration, The MiNDSTEp Consortium, The μFUN Collaboration, The PLANET Collaboration. 2012. Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events. Astrophysical Journal. 755(2):91. https://doi.org/10.1088/0004-637X/755/2/91

MLA

Vancouver

The OGLE Collaboration, The MOA Collaboration, The RoboNet Collaboration, The MiNDSTEp Consortium, The μFUN Collaboration, The PLANET Collaboration. Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events. Astrophysical Journal. 2012 Aug 1;755(2):91. https://doi.org/10.1088/0004-637X/755/2/91

Author

The OGLE Collaboration ; The MOA Collaboration ; The RoboNet Collaboration ; The MiNDSTEp Consortium ; The μFUN Collaboration ; The PLANET Collaboration. / Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events. In: Astrophysical Journal. 2012 ; Vol. 755, No. 2. pp. 91.

Bibtex

@article{941ba0a3731d4b93a8ff70b1c26187b3,
title = "Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events",
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 &sun; and 0.39 M &sun; for MOA-2011-BLG-090 and 0.57 M &sun; and 0.17 M &sun; 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.",
author = "I.-G. Shin and C. Han and J.-Y. Choi and A. Udalski and T. Sumi and A. Gould and V. Bozza and M. Dominik and P. Fouqu{\'e} and K. Horne and Szyma{\'n}ski, {M. K.} and M. Kubiak and I. Soszy{\'n}ski and G. Pietrzy{\'n}ski and R. Poleski and K. Ulaczyk and P. Pietrukowicz and S. Koz{\l}owski and J. Skowron and {\L}. Wyrzykowski and F. Abe and Bennett, {D. P.} and Bond, {I. A.} and Botzler, {C. S.} and P. Chote and M. Freeman and A. Fukui and K. Furusawa and Y. Itow and S. Kobara and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and K. Ohmori and K. Ohnishi and Rattenbury, {N. J.} and To. Saito and Sullivan, {D. J.} and D. Suzuki and K. Suzuki and Sweatman, {W. L.} and S. Takino and Tristram, {P. J.} and K. Wada and F. Grundahl and J. Jessen-Hansen and Lund, {Mikkel N{\o}rup} and Mia Lundkvist and {The OGLE Collaboration} and {The MOA Collaboration} and {The RoboNet Collaboration} and {The MiNDSTEp Consortium} and {The μFUN Collaboration} and {The PLANET Collaboration}",
year = "2012",
month = aug,
day = "1",
doi = "10.1088/0004-637X/755/2/91",
language = "English",
volume = "755",
pages = "91",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing, Inc",
number = "2",

}

RIS

TY - JOUR

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, Ł.

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 - Grundahl, F.

AU - Jessen-Hansen, J.

AU - Lund, Mikkel Nørup

AU - Lundkvist, Mia

AU - The OGLE Collaboration

AU - The MOA Collaboration

AU - The RoboNet Collaboration

AU - The MiNDSTEp Consortium

AU - The μFUN Collaboration

AU - The PLANET Collaboration

PY - 2012/8/1

Y1 - 2012/8/1

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 &sun; and 0.39 M &sun; for MOA-2011-BLG-090 and 0.57 M &sun; and 0.17 M &sun; 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 &sun; and 0.39 M &sun; for MOA-2011-BLG-090 and 0.57 M &sun; and 0.17 M &sun; 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.

U2 - 10.1088/0004-637X/755/2/91

DO - 10.1088/0004-637X/755/2/91

M3 - Journal article

VL - 755

SP - 91

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -