OGLE-2005-BLG-153: Microlensing discovery and characterization of a very low mass binary

K. H. Hwang, A. Udalski, C. Han, Y. H. Ryu, I. A. Bond, J. P. Beaulieu, M. Dominik, K. Horne, A. Gould, B. S. Gaudi, M. Kubiak, M. K. Szymański, G. Pietrzyński, I. Soszyński, O. Szewczyk, K. Ulaczyk, Wyrzykowski, F. Abe, C. S. Botzler, J. B. HearnshawY. Itow, K. Kamiya, P. M. Kilmartin, K. Masuda, Y. Matsubara, M. Motomura, Y. Muraki, S. Nakamura, K. Ohnishi, C. Okada, N. Rattenbury, To Saito, T. Sako, M. Sasaki, D. J. Sullivan, T. Sumi, P. J. Tristram, J. N. Wood, P. C M Yock, T. Yoshioka, M. Albrow, D. P. Bennett, D. M. Bramich, S. Brillant, J. A R Caldwell, J. J. Calitz, A. Cassan, K. H. Cook, E. Corrales, C. Coutures, M. Desort, S. Dieters, D. Dominis, J. Donatowicz, P. Fouqué, J. Greenhill, K. Harpsøe, K. Hill, M. Hoffman, U. G. Jørgensen, S. Kane, D. Kubas, R. Martin, J. B. Marquette, P. Meintjes, J. Menzies, K. Pollard, K. Sahu, I. Steele, C. Vinter, J. Wambsganss, A. Williams, K. Woller, M. Burgdorf, C. Snodgrass, M. Bode, D. L. Depoy, C. U. Lee, B. G. Park, R. W. Pogge

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly known due to observational difficulties caused by the faintness of the objects. Here we report the microlensing discovery and characterization of a binary lens composed of very low mass stars just above the hydrogen-burning limit. From the combined measurements of the Einstein radius and microlens parallax, we measure the masses of the binary components of 0.10±0.01 M and 0.09±0.01 M. This discovery demonstrates that microlensing will provide a method to measure the mass function of all Galactic populations of very low mass binaries that is independent of the biases caused by the luminosity of the population.

Original languageEnglish
Pages (from-to)797-802
Number of pages6
JournalAstrophysical Journal
Volume723
Issue number1
DOIs
Publication statusPublished - 1 Nov 2010
Externally publishedYes

Fingerprint

parallax
star formation
luminosity
lenses
statistics
hydrogen
stars
radii
method

Keywords

  • Binaries
  • General - gravitational lensing
  • Micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hwang, K. H., Udalski, A., Han, C., Ryu, Y. H., Bond, I. A., Beaulieu, J. P., ... Pogge, R. W. (2010). OGLE-2005-BLG-153: Microlensing discovery and characterization of a very low mass binary. Astrophysical Journal, 723(1), 797-802. https://doi.org/10.1088/0004-637X/723/1/797

OGLE-2005-BLG-153 : Microlensing discovery and characterization of a very low mass binary. / Hwang, K. H.; Udalski, A.; Han, C.; Ryu, Y. H.; Bond, I. A.; Beaulieu, J. P.; Dominik, M.; Horne, K.; Gould, A.; Gaudi, B. S.; Kubiak, M.; Szymański, M. K.; Pietrzyński, G.; Soszyński, I.; Szewczyk, O.; Ulaczyk, K.; Wyrzykowski; Abe, F.; Botzler, C. S.; Hearnshaw, J. B.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Masuda, K.; Matsubara, Y.; Motomura, M.; Muraki, Y.; Nakamura, S.; Ohnishi, K.; Okada, C.; Rattenbury, N.; Saito, To; Sako, T.; Sasaki, M.; Sullivan, D. J.; Sumi, T.; Tristram, P. J.; Wood, J. N.; Yock, P. C M; Yoshioka, T.; Albrow, M.; Bennett, D. P.; Bramich, D. M.; Brillant, S.; Caldwell, J. A R; Calitz, J. J.; Cassan, A.; Cook, K. H.; Corrales, E.; Coutures, C.; Desort, M.; Dieters, S.; Dominis, D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Harpsøe, K.; Hill, K.; Hoffman, M.; Jørgensen, U. G.; Kane, S.; Kubas, D.; Martin, R.; Marquette, J. B.; Meintjes, P.; Menzies, J.; Pollard, K.; Sahu, K.; Steele, I.; Vinter, C.; Wambsganss, J.; Williams, A.; Woller, K.; Burgdorf, M.; Snodgrass, C.; Bode, M.; Depoy, D. L.; Lee, C. U.; Park, B. G.; Pogge, R. W.

In: Astrophysical Journal, Vol. 723, No. 1, 01.11.2010, p. 797-802.

Research output: Contribution to journalArticle

Hwang, KH, Udalski, A, Han, C, Ryu, YH, Bond, IA, Beaulieu, JP, Dominik, M, Horne, K, Gould, A, Gaudi, BS, Kubiak, M, Szymański, MK, Pietrzyński, G, Soszyński, I, Szewczyk, O, Ulaczyk, K, Wyrzykowski, Abe, F, Botzler, CS, Hearnshaw, JB, Itow, Y, Kamiya, K, Kilmartin, PM, Masuda, K, Matsubara, Y, Motomura, M, Muraki, Y, Nakamura, S, Ohnishi, K, Okada, C, Rattenbury, N, Saito, T, Sako, T, Sasaki, M, Sullivan, DJ, Sumi, T, Tristram, PJ, Wood, JN, Yock, PCM, Yoshioka, T, Albrow, M, Bennett, DP, Bramich, DM, Brillant, S, Caldwell, JAR, Calitz, JJ, Cassan, A, Cook, KH, Corrales, E, Coutures, C, Desort, M, Dieters, S, Dominis, D, Donatowicz, J, Fouqué, P, Greenhill, J, Harpsøe, K, Hill, K, Hoffman, M, Jørgensen, UG, Kane, S, Kubas, D, Martin, R, Marquette, JB, Meintjes, P, Menzies, J, Pollard, K, Sahu, K, Steele, I, Vinter, C, Wambsganss, J, Williams, A, Woller, K, Burgdorf, M, Snodgrass, C, Bode, M, Depoy, DL, Lee, CU, Park, BG & Pogge, RW 2010, 'OGLE-2005-BLG-153: Microlensing discovery and characterization of a very low mass binary', Astrophysical Journal, vol. 723, no. 1, pp. 797-802. https://doi.org/10.1088/0004-637X/723/1/797
Hwang, K. H. ; Udalski, A. ; Han, C. ; Ryu, Y. H. ; Bond, I. A. ; Beaulieu, J. P. ; Dominik, M. ; Horne, K. ; Gould, A. ; Gaudi, B. S. ; Kubiak, M. ; Szymański, M. K. ; Pietrzyński, G. ; Soszyński, I. ; Szewczyk, O. ; Ulaczyk, K. ; Wyrzykowski ; Abe, F. ; Botzler, C. S. ; Hearnshaw, J. B. ; Itow, Y. ; Kamiya, K. ; Kilmartin, P. M. ; Masuda, K. ; Matsubara, Y. ; Motomura, M. ; Muraki, Y. ; Nakamura, S. ; Ohnishi, K. ; Okada, C. ; Rattenbury, N. ; Saito, To ; Sako, T. ; Sasaki, M. ; Sullivan, D. J. ; Sumi, T. ; Tristram, P. J. ; Wood, J. N. ; Yock, P. C M ; Yoshioka, T. ; Albrow, M. ; Bennett, D. P. ; Bramich, D. M. ; Brillant, S. ; Caldwell, J. A R ; Calitz, J. J. ; Cassan, A. ; Cook, K. H. ; Corrales, E. ; Coutures, C. ; Desort, M. ; Dieters, S. ; Dominis, D. ; Donatowicz, J. ; Fouqué, P. ; Greenhill, J. ; Harpsøe, K. ; Hill, K. ; Hoffman, M. ; Jørgensen, U. G. ; Kane, S. ; Kubas, D. ; Martin, R. ; Marquette, J. B. ; Meintjes, P. ; Menzies, J. ; Pollard, K. ; Sahu, K. ; Steele, I. ; Vinter, C. ; Wambsganss, J. ; Williams, A. ; Woller, K. ; Burgdorf, M. ; Snodgrass, C. ; Bode, M. ; Depoy, D. L. ; Lee, C. U. ; Park, B. G. ; Pogge, R. W. / OGLE-2005-BLG-153 : Microlensing discovery and characterization of a very low mass binary. In: Astrophysical Journal. 2010 ; Vol. 723, No. 1. pp. 797-802.
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T1 - OGLE-2005-BLG-153

T2 - Microlensing discovery and characterization of a very low mass binary

AU - Hwang, K. H.

AU - Udalski, A.

AU - Han, C.

AU - Ryu, Y. H.

AU - Bond, I. A.

AU - Beaulieu, J. P.

AU - Dominik, M.

AU - Horne, K.

AU - Gould, A.

AU - Gaudi, B. S.

AU - Kubiak, M.

AU - Szymański, M. K.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Szewczyk, O.

AU - Ulaczyk, K.

AU - Wyrzykowski,

AU - Abe, F.

AU - Botzler, C. S.

AU - Hearnshaw, J. B.

AU - Itow, Y.

AU - Kamiya, K.

AU - Kilmartin, P. M.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Motomura, M.

AU - Muraki, Y.

AU - Nakamura, S.

AU - Ohnishi, K.

AU - Okada, C.

AU - Rattenbury, N.

AU - Saito, To

AU - Sako, T.

AU - Sasaki, M.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Tristram, P. J.

AU - Wood, J. N.

AU - Yock, P. C M

AU - Yoshioka, T.

AU - Albrow, M.

AU - Bennett, D. P.

AU - Bramich, D. M.

AU - Brillant, S.

AU - Caldwell, J. A R

AU - Calitz, J. J.

AU - Cassan, A.

AU - Cook, K. H.

AU - Corrales, E.

AU - Coutures, C.

AU - Desort, M.

AU - Dieters, S.

AU - Dominis, D.

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Harpsøe, K.

AU - Hill, K.

AU - Hoffman, M.

AU - Jørgensen, U. G.

AU - Kane, S.

AU - Kubas, D.

AU - Martin, R.

AU - Marquette, J. B.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K.

AU - Sahu, K.

AU - Steele, I.

AU - Vinter, C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Woller, K.

AU - Burgdorf, M.

AU - Snodgrass, C.

AU - Bode, M.

AU - Depoy, D. L.

AU - Lee, C. U.

AU - Park, B. G.

AU - Pogge, R. W.

PY - 2010/11/1

Y1 - 2010/11/1

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AB - The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly known due to observational difficulties caused by the faintness of the objects. Here we report the microlensing discovery and characterization of a binary lens composed of very low mass stars just above the hydrogen-burning limit. From the combined measurements of the Einstein radius and microlens parallax, we measure the masses of the binary components of 0.10±0.01 M⊙ and 0.09±0.01 M⊙. This discovery demonstrates that microlensing will provide a method to measure the mass function of all Galactic populations of very low mass binaries that is independent of the biases caused by the luminosity of the population.

KW - Binaries

KW - General - gravitational lensing

KW - Micro

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U2 - 10.1088/0004-637X/723/1/797

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JO - Astrophysical Journal

JF - Astrophysical Journal

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