GJ1108A系统的轨道表征及分辨双星动力学质量与模型推导质量之比较
太阳与恒星天体物理
2018-10-17 v1 地球与行星天体物理
摘要
我们报道了GJ1108Aab的轨道表征，这是一个处于主序前阶段的低质量双星系统。通过结合自适应光学天体测量与视向速度测量，获得了偏心轨道解 =0.63，这可能由与广泛分离的GJ1108B系统之间的Kozai-Lidov机制引起。结合若干观测性质，我们确认该系统确实年轻。Columba是最可能的运动星组，GJ1108A系统属于该星组，尽管其成员资格尚未确立。若假设GJ1108A具有Columba的年龄，则GJ1108Aa与GJ1108Ab的动力学质量（ 和 ）比基于年龄和光度推演的演化模型所预测的质量更大。我们认为质量比较中的差异可归因于年龄不确定性；该系统可能比Columba中的恒星更老，且经典模型中未实现的效应（如吸积历史和磁活动）并非解释质量差异的首选。我们还通过整理文献中基于演化状态的类似低质量天体，讨论了该演化模型的性能。结果表明，当前模型平均能复现分辨低质量双星的质量，且无显著偏移。
引用
@article{arxiv.1808.04996,
title = {Orbital characterization of GJ1108A system, and comparison of dynamical mass with model-derived mass for resolved binaries},
author = {T. Mizuki and M. Kuzuhara and K. Mede and J. E. Schlieder and M. Janson and T. D. Brandt and T. Hirano and N. Narita and J. Wisniewski and T. Yamada and B. Biller and M. Bonnefoy and J. C. Carson and M. W. McElwain and T. Matsuo and E. L. Turner and S. Mayama and E. Akiyama and T. Uyama and T. Nakagawa and T. Kudo and N. Kusakabe and J. Hashimoto and L. Abe and W. Brander and S. Egner and M. Feldt and M. Goto and C. A. Grady and O. Guyon and Y. Hayano and M. Hayashi and S. S. Hayashi and T. Henning and K. W. Hodapp and M. Ishii and M. Iye and R. Kandori and G. R. Knapp and J. Kwon and S. Miyama and J. Morino and A. Moro-Martin and T. Nishimura and T. Pyo and E. Serabyn and T. Suenaga and H. Suto and R. Suzuki and Y. H. Takahashi and M. Takami and N. Takato and H. Terada and C. Thalmann and M. Watanabe and H. Takami and T. Usuda and M. Tamura},
journal= {arXiv preprint arXiv:1808.04996},
year = {2018}
}
备注
Accepted in ApJ