通过长时标焦散穿越引力微透镜事件观测表征低质量双星
太阳与恒星天体物理
2016-08-14 v3
摘要
尽管双星系统具有重要的天体物理学意义，但目前的探测仅限于分离度、距离和质量范围较小的系统，因此有必要使用多种观测技术，以获得跨越广泛物理参数的恒星多重性的完整图景。在本文中，我们报告了通过对微透镜事件 MOA-2011-BLG-090 和 OGLE-2011-BLG-0417 的观测所发现并测量的两个双星系统。通过同时测量爱因斯坦半径和透镜视差，可以确定双星的质量。测得的双星组分质量分别为：MOA-2011-BLG-090 为 0.43 和 0.39 ，OGLE-2011-BLG-0417 为 0.57 和 0.17 ；因此，MOA-2011-BLG-090 的两个透镜组分以及 OGLE-2011-BLG-0417 的一个组分均为 M 型矮星，这证明了微透镜在探测由低质量组分构成的双星方面的效用。通过考虑透镜的全开普勒运动对光变曲线进行建模，我们还测量了双星的轨道参数。OGLE-2011-BLG-0417 的混合光很可能来自透镜本身，这使得通过后续径向速度观测来检验微透镜轨道解成为可能。对于这两个事件，光变曲线中对确定物理透镜参数至关重要的焦散穿越部分，已通过高时间分辨率巡天观测得到解析，因此预计未来具有实测物理参数的微透镜双星数量将会增加。
引用
@article{arxiv.1204.2869,
title = {Characterizing Low-Mass Binaries From Observation of Long Time-scale Caustic-crossing Gravitational Microlensing Events},
author = {I. -G. Shin and C. Han and J. -Y. Choi and A. Udalski and T. Sumi and A. Gould and V. Bozza and M. Dominik and P. Fouqué and K. Horne and M. and 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 P. Chote and M. Freeman and A. Fukui and K. Furusawa and Y. Itow and S. Kobara and C. H. Ling and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and K. Ohmori and K. Ohnishi and N. J. Rattenbury and To. Saito and D. J. Sullivan and D. Suzuki and K. Suzuki and W. L. Sweatman and S. Takino and P. J. Tristram and K. Wada and P. C. M. Yock and D. M. Bramich and C. Snodgrass and I. A. Steele and R. A. Street and Y. Tsapras and K. A. Alsubai and P. Browne 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 A. Hornstrup 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. Lunkkvist and L. Mancini and M. Mathiasen and M. T. Penny and S. Rahvar and D. Ricci and G. Scarpetta and J. Skottfelt and J. Southworth and J. Surdej and J. Tregloan-Reed and J. Wambsganss and O. Wertz and L. A. Almeida and V. Batista and G. Christie and D. L. DePoy and Subo Dong and B. S. Gaudi and C. Henderson and F. Jablonski and C. -U. Lee and J. McCormick and D. McGregor and D. Moorhouse and T. Natusch and H. Ngan and S. -Y. Park and R. W. Pogge and T. -G. Tan and G. Thornley and J. C. Yee and M. D. Albrow and E. Bachelet and J. -P. Beaulieu and S. Brillant and A. Cassan and A. A. Cole and E. Corrales and C. Coutures and S. Dieters and D. Dominis Prester and J. Donatowicz and J. Greenhill and D. Kubas and J. -B. Marquette and J. W. Menzies and K. C. Sahu and M. Zub},
journal= {arXiv preprint arXiv:1204.2869},
year = {2016}
}
备注
8 pages, 5 figures, 4 tables