Microlensing Binaries Discovered through High-Magnification Channel
Abstract
Microlensing can provide a useful tool to probe binary distributions down to low-mass limits of binary companions. In this paper, we analyze the light curves of 8 binary lensing events detected through the channel of high-magnification events during the seasons from 2007 to 2010. The perturbations, which are confined near the peak of the light curves, can be easily distinguished from the central perturbations caused by planets. However, the degeneracy between close and wide binary solutions cannot be resolved with a confidence level for 3 events, implying that the degeneracy would be an important obstacle in studying binary distributions. The dependence of the degeneracy on the lensing parameters is consistent with a theoretic prediction that the degeneracy becomes severe as the binary separation and the mass ratio deviate from the values of resonant caustics. The measured mass ratio of the event OGLE-2008-BLG-510/MOA-2008-BLG-369 is , making the companion of the lens a strong brown-dwarf candidate.
Cite
@article{arxiv.1109.3295,
title = {Microlensing Binaries Discovered through High-Magnification Channel},
author = {I. -G. Shin and J. -Y. Choi and S. -Y. Park and C. Han and A. Gould and T. Sumi and A. Udalski and J. -P. Beaulieu and M. Dominik and W. Allen and M. Bos and G. W. Christie and D. L. Depoy and S. Dong and J. Drummond and A. Gal-Yam and B. S. Gaudi and L. -W. Hung and J. Janczak and S. Kaspi and C. -U. Lee and F. Mallia and D. Maoz and A. Maury and J. McCormick and L. A. G. Monard and D. Moorhouse and J. A. Muñoz and T. Natusch and C. Nelson and B. -G. Park and R. W. Pogge and D. Polishook and Y. Shvartzvald and A. Shporer and G. Thornley and J. C. Yee and F. Abe and D. P. Bennett and I. A. Bond and C. S. Botzler and A. Fukui and K. Furusawa and F. Hayashi and J. B. Hearnshaw and S. Hosaka and Y. Itow and K. Kamiya and P. M. Kilmartin and S. Kobara and A. Korpela and W. Lin and C. H. Ling and S. Makita and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and K. Nishimoto and K. Ohnishi and T. Okumura and K. Omori and Y. C. Perrott and N. Rattenbury and To. Saito and L. Skuljan and D. J. Sullivan and D. Suzuki and W. L. Sweatman and P. J. Tristram and K. Wada and P. C. M. Yock and M. K. Szymański and M. Kubiak and G. Pietrzyński and I. Soszyński and R. Poleski and K. Ulaczyk and Ł. Wyrzykowski and S. Kozłowski and P. Pietrukowicz and M. D. Albrow and V. Batista and D. M. Bramich and S. Brillant and J. A. R. Caldwell and J. J. Calitz and A. Cassan and A. Cole and K. H. Cook and E. Corrales and Ch. Coutures and S. Dieters and D. Dominis Prester and J. Donatowicz and P. Fouqué and J. Greenhill and M. Hoffman and U. G. Jørgensen and S. R. Kane and D. Kubas and J. -B. Marquette and R. Martin and P. Meintjes and J. Menzies and K. R. Pollard and K. C. Sahu and J. Wambsganss and A. Williams and C. Vinter and M. Zub and A. Allan and P. Browne and K. Horne and C. Snodgrass and I. Steele and R. Street and Y. Tsapras and K. A. Alsubai and V. Bozza and P. Browne and M. J. Burgdorf and S. Calchi Novati and P. Dodds and S. Dreizler and F. Finet and T. Gerner and M. Glitrup and F. Grundahl and S. Hardis and K. Harpsøe and F. V. Hessman and T. C. Hinse and M. Hundertmark and N. Kains and E. Kerins and C. Liebig and G. Maier and L. Mancini and M. Mathiasen and M. T. Penny and S. Proft and S. Rahvar and D. Ricci and G. Scarpetta and S. Schäfer and F. Schönebeck and J. Skottfelt and J. Surdej and J. Southworth and F. Zimmer},
journal= {arXiv preprint arXiv:1109.3295},
year = {2015}
}
Comments
10 figures, 6 tables, 26 pages