微引力透镜双星中的候选棕矮星伴星
太阳与恒星天体物理
2015-06-11 v2
摘要
棕矮星是重要的天体，因为它们可能提供了恒星和行星之间的缺失环节，这两个种群具有截然不同的形成历史。在本文中，我们介绍了通过分析2004-2011观测季节期间发现的微引力透镜双星事件而发现的候选棕矮星伴星双星。基于低质量比准则q<0.2，我们发现了7个候选事件，包括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和MOA-2011-BLG-278/OGLE-2011-BLG-012N。其中，通过同时测量爱因斯坦半径和透镜视差确定透镜质量，我们能够确认MOA-2011-BLG-104/OGLE-2011-BLG-0172和MOA-2011-BLG-149的透镜伴星是棕矮星。测量得到的棕矮星伴星质量分别为(0.02±0.01) M_Sun和(0.019±0.002) M_Sun，两个伴星都围绕低质量M矮星宿主恒星运行。随着新一代巡天中光变曲线覆盖良好的透镜事件数量的增加，预计将探测到更多的微引力透镜棕矮星。
引用
@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}
}
备注
10 pages, 9 figures, 4 tables