Microlensig Binaries with Candidate Brown Dwarf Companions
Abstract
Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation history. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during 2004 - 2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found 7 candidate events, including OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE-2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured mass of the brown dwarf companions are (0.02 +/- 0.01) M_Sun and (0.019 +/- 0.002) M_Sun for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well covered light curves increases with new generation searches.
Cite
@article{arxiv.1208.2323,
title = {Microlensig Binaries with Candidate Brown Dwarf Companions},
author = {I. -G. Shin and C. Han and A. Gould and A. Udalski and T. Sumi and M. Dominik and J. -P. Beaulieu and Y. Tsapras and V. Bozza and M. K. Szymański and M. Kubiak and I. Soszyński and G. Pietrzyński and R. Poleski and K. Ulaczyk and P. Pietrukowicz and S. Kozłowski and J. Skowron and Ł. Wyrzykowski and F. Abe and D. P. Bennett and I. A. Bond and C. S. Botzler and M. Freeman 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 G. W. Christie and D. L. Depoy and S. Dong and A. Gal-Yam and B. S. Gaudi and L. -W. Hung and J. Janczak and S. Kaspi and D. Maoz and J. McCormick and D. McGregor and D. Moorhouse and J. A. Muñoz and T. Natusch and C. Nelson and R. W. Pogge and T. -G. Tan and D. Polishook and Y. Shvartzvald and A. Shporer and G. Thornley and U. Malamud and J. C. Yee and J. -Y. Choi and Y. -K. Jung and H. Park and C. -U. Lee and B. -G. Park and J. -R. Koo and D. Bajek and D. M. Bramich and P. Browne and K. Horne and S. Ipatov and C. Snodgrass and I. Steele and R. Street and K. A. Alsubai and M. J. Burgdorf and S. Calchi Novati and P. Dodds and S. Dreizler and X. -S. Fang and F. Grundahl and C. -H. Gu and S. Hardis and K. Harpsøe and T. C. Hinse and M. Hundertmark and J. Jessen-Hansen and U. G. Jørgensen and N. Kains and E. Kerins and C. Liebig and M. Lund and M. Lundkvist and L. Mancini and M. Mathiasen and A. Hornstrup and M. T. Penny and S. Proft and S. Rahvar and D. Ricci and G. Scarpetta and J. Skottfelt and J. Southworth and J. Surdej and J. Tregloan-Reed and O. Wertz and F. Zimmer and M. D. Albrow and V. Batista 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 K. Hill and M. Hoffman 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},
journal= {arXiv preprint arXiv:1208.2323},
year = {2015}
}
Comments
10 pages, 9 figures, 4 tables