OGLE-2013-BLG-0911Lb：一颗位于棕矮星—行星边界上的 M 型矮星次星体
地球与行星天体物理
2020-02-05 v1 星系天体物理
太阳与恒星天体物理
摘要
我们给出了对双星透镜微引力透镜事件 OGLE-2013-BLG-0911 的分析。最佳拟合解给出的双星质量比为 q~0.03，这与 Shvartzvald+2016 所报道的结果不同。该事件受到著名的近/远简并影响，产生了两组以爱因斯坦半径归一化的投影分离解：s~0.15 或 s~7。有限源与视差观测使我们能够测量透镜的物理参数。该透镜系统为一颗 M 型矮星，其周围有一颗大质量类木星伴星，处于非常近（M_{host}=0.30^{+0.08}_{-0.06} M_{Sun}, M_{comp}=10.1^{+2.9}_{-2.2} M_{Jup}, a_{exp}=0.40^{+0.05}_{-0.04} au）或远（M_{host}=0.28^{+0.10}_{-0.08} M_{Sun}, M_{comp}=9.9^{+3.8}_{-3.5}M_{Jup}, a_{exp}=18.0^{+3.2}_{-3.2} au）的分离轨道上。尽管质量比略高于通常使用的 q=0.03 的行星—棕矮星（BD）质量比边界，但该伴星的中位物理质量略低于 13M_{Jup} 的行星—BD 质量边界。BD 与行星的形成机制很可能不同，而处于边界附近的物体可能由其中任一种机制形成。探测具有约 13M_{Jup} 质量的此类伴星的分布，对于从统计上约束 BD 与大质量行星的形成理论十分重要。特别是，微引力透镜方法能够探测低质量 M 型矮星甚至 BD 周围的分布，而这用其他系外行星探测方法是具有挑战性的。
引用
@article{arxiv.1912.09613,
title = {OGLE-2013-BLG-0911Lb: A Secondary on the Brown-Dwarf Planet Boundary around an M-dwarf},
author = {Shota Miyazaki and Takahiro Sumi and David P. Bennett and Andrzej Udalski and Yossi Shvartzvald and Rachel Street and Valerio Bozza and Jennifer C. Yee and Ian A. Bond and Nicholas Rattenbury and Naoki Koshimoto and Daisuke Suzuki and Akihiko Fukui and F. Abe and A. Bhattacharya and R. Barry and M. Donachie and H. Fujii and Y. Hirao and Y. Itow and Y. Kamei and I. Kondo and M. C. A. Li and C. H. Ling and Y. Matsubara and T. Matsuo and Y. Muraki and M. Nagakane and K. Ohnishi and C. Ranc and T. Saito and A. Sharan and H. Shibai and H. Suematsu and D. J. Sullivan and P. J. Tristram and T. Yamakawa and A. Yonehara and J. Skowron and R. Poleski and P. Mr'oz and M. K. Szyma'nski and I. Soszy'nski and P. Pietrukowicz and S. KozLowski and K. Ulaczyk and L. Wyrzykowski and Matan Friedmann and Shai Kaspi and Dan Maoz and M. Albrow and G. Christie and D. L. DePoy and A. Gal-Yam and A. Gould and C. -U. Lee and I. Manulis and J. McCormick and T. Natusch and H. Ngan and R. W. Pogge and I. Porritt and Y. Tsapras and E. Bachelet and M. P. G. Hundertmark and M. Dominik and D. M. Bramich and A. Cassan and R. Figuera Jaimes and K. Horne and R. Schmidt and C. Snodgrass and J. Wambsganss and I. A. Steele and J. Menzies and S. Mao and U. G. Jorgensen and M. J. Burgdorf and S. Ciceri and S. Calchi Novati and G. D'Ago and D. F. Evans and T. C. Hinse and N. Kains and E. Kerins and H. Korhonen and L. Mancini and A. Popovas and M. Rabus and S. Rahvar and G. Scarpetta and J. Skottfelt and J. Southworth and G. D'Ago and N. Peixinho and P. Verma},
journal= {arXiv preprint arXiv:1912.09613},
year = {2020}
}
备注
22 pages, 10 figures, Accepted for publication in The Astronomical Journal