双星微引力透镜事件OGLE-2009-BLG-020：可验证的质量、距离和轨道预测
太阳与恒星天体物理
2015-05-27 v1
摘要
我们展示了首个双星微引力透镜实例，其参数测量可通过未来的多普勒观测进行验证（或反驳）。这一检验得以实现，得益于两种相对罕见情况的交汇。首先，双星透镜足够明亮（I=15.6），可以进行多普勒测量。其次，我们不仅测量了通常的7个双星透镜参数，还测量了“微透镜视差”（由此得到双星质量）和瞬时轨道速度的两个分量。因此，我们实际上测量了6个“开普勒+1”参数（两个瞬时位置、两个瞬时速度、双星总质量和质量比）。由于对较亮双星分量的多普勒观测可确定5个开普勒参数（周期、速度振幅、偏心率、相位和近星点位置），而同样的光谱学测量可得到主星质量，因此多普勒与微透镜联合观测将因6 + (5 + 1) - (7 + 1) = 4个自由度而过约束。这使得对微透镜解的极强检验成为可能。我们还引入了单星和双星透镜的统一微透镜符号体系，定义了约定，总结了所有已知的微透镜简并性，并扩展了一组参数以描述双星透镜的完整开普勒运动。
引用
@article{arxiv.1101.3312,
title = {Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions},
author = {J. Skowron and A. Udalski and A. Gould and Subo Dong and L. A. G. Monard and C. Han and C. R. Nelson and J. McCormick and D. Moorhouse and G. Thornley and A. Maury and D. M. Bramich and J. Greenhill and S. Kozlowski and I. Bond and R. Poleski and L. Wyrzykowski and K. Ulaczyk and M. Kubiak and M. K. Szymanski and G. Pietrzynski and I. Soszynski and B. S. Gaudi and J. C. Yee and L. -W. Hung and R. W. Pogge and D. L. DePoy and C. -U. Lee and B. -G. Park and W. Allen and F. Mallia and J. Drummond and G. Bolt and A. Allan and P. Browne and N. Clay and M. Dominik and S. Fraser and K. Horne and N. Kains and C. Mottram and C. Snodgrass and I. Steele and R. A. Street and Y. Tsapras and F. Abe and D. P. Bennett and C. S. Botzler and D. Douchin 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 A. Korpela and W. Lin and C. H. Ling and S. Makita and K. Masuda and Y. Matsubara and Y. Muraki and T. Nagayama and N. Miyake and K. Nishimoto and K. Ohnishi and Y. C. Perrott and N. Rattenbury and To. Saito and L. Skuljan and D. J. Sullivan and T. Sumi and D. Suzuki and W. L. Sweatman and P. J. Tristram and K. Wada and P. C. M. Yock and J. -P. Beaulieu and P. Fouque and M. D. Albrow and V. Batista and S. Brillant and J. A. R. Caldwell and A. Cassan and A. Cole and K. H. Cook and Ch. Coutures and S. Dieters and D. Dominis Prester and J. Donatowicz and S. R. Kane and D. Kubas and J. -B. Marquette and R. Martin and J. Menzies and K. C. Sahu and J. Wambsganss and A. Williams and M. Zub},
journal= {arXiv preprint arXiv:1101.3312},
year = {2015}
}
备注
51 pages, 8 figures, 2 appendices. Submitted to ApJ. Fortran codes for Appendix B are attached to this astro-ph submission and are also available at http://www.astronomy.ohio-state.edu/~jskowron/OGLE-2009-BLG-020/