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

Hwang, K.-H.; Udalski, A.; 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, Ł.; 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. and Pogge, R. W. (2010). OGLE-2005-BLG-153: microlensing discovery and characterization of a very low mass binary. Astrophysical Journal, 723(1) pp. 797–802.

DOI (Digital Object Identifier) Link: https://doi.org/10.1088/0004-637X/723/1/797
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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.

Item Type: Journal Item
Copyright Holders: 2010 The American Astronomical Society
ISSN: 1538-4357
Keywords: binaries; gravitational lensing
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 43086
Depositing User: Colin Snodgrass
Date Deposited: 12 Jun 2015 08:58
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43086
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