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


Hwang, KH and Udalski, A and Han, C and Ryu, YH and Bond, IA and Beaulieu, JP and Dominik, M and Horne, K and Gould, A and Gaudi, BS and Kubiak, M and Szymanski, MK and Pietrzynski, G and Soszynski, I and Szewczyk, O and Ulaczyk, K and Wyrzykowski, L and Abe, F and Botzler, CS and Hearnshaw, JB and Itow, Y and Kamiya, K and Kilmartin, PM and Masuda, K and Matsubara, Y and Motomura, M and Muraki, Y and Nakamura, S and Ohnishi, K and Okada, C and Rattenbury, N and Saito, TO and Sako, T and Sasaki, M and Sullivan, DJ and Sumi, T and Tristram, PJ and Wood, JN and Yock, PCM and Yoshioka, T and Albrow, M and Bennett, DP and Bramich, DM and Brillant, S and Caldwell, JAR and Calitz, JJ and Cassan, A and Cook, KH and Corrales, E and Coutures, C and Desort, M and Dieters, S and Dominis, D and Donatowicz, J and Fouque, P and Greenhill, J and Harpsoe, K and Hill, K and Hoffman, M and Jorgensen, UG and Kane, S and Kubas, D and Martin, R and Marquette, JB and Meintjes, P and Menzies, J and Pollard, K and Sahu, K and Steele, I and Vinter, C and Wambsganss, G and Williams, A and Woller, K and Burgdorf, M and Snodgrass, C and Bode, M and Depoy, D and Lee, CU and Park, BG and Pogge, RW, OGLE-2005-BLG-153: Microlensing discovery and characterization of a very low mass binary, Astrophysical Journal, 723, (1) pp. 797-802. ISSN 0004-637X (2010) [Refereed Article]

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Copyright © 2010 Institute of Physics

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DOI: doi:10.1088/0004-637x/723/1/797


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 Details

Item Type:Refereed Article
Keywords:binaries: general – gravitational lensing: micro
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:High energy astrophysics and galactic cosmic rays
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Greenhill, J (Dr John Greenhill)
UTAS Author:Hill, K (Dr Kym Hill)
ID Code:66959
Year Published:2010
Web of Science® Times Cited:11
Deposited By:Physics
Deposited On:2011-02-21
Last Modified:2015-01-21

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