Two-Micron All-Sky Survey J01542930+0053266: A new eclipsing M dwarf binary system
Two-Micron All-Sky Survey J01542930+0053266: A new eclipsing M dwarf binary system
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DOI：
10.1111/j.1365-2966.2008.13040.x
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发表时间：
2008-05
影响因子：
4.8
通讯作者：
A. Becker;E. Agol;N. Silvestri;J. Bochanski;C. Laws;A. West;G. Basri;V. Belokurov;D. Bramich;J. Carpenter;P. Challis;K. Covey;R. Cutri;N. Evans;M. Fellhauer;A. Garg;G. Gilmore;P. Hewett;P. Plavchan;D. Schneider;C. Slesnick;S. Vidrih;L. Walkowicz;D. Zucker
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文献类型：
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作者：
A. Becker;E. Agol;N. Silvestri;J. Bochanski;C. Laws;A. West;G. Basri;V. Belokurov;D. Bramich;J. Carpenter;P. Challis;K. Covey;R. Cutri;N. Evans;M. Fellhauer;A. Garg;G. Gilmore;P. Hewett;P. Plavchan;D. Schneider;C. Slesnick;S. Vidrih;L. Walkowicz;D. Zucker
本文报道了由两颗M矮星组成的两微米全天巡天（2 MASS）J 01542930 +0053266。该系统的可变性最初是在2 MASS校准点源工作数据库的试点研究期间发现的。斯隆数字巡天的额外测光产生了一个八通带的光变曲线，我们从中得出轨道周期为2.639 0157 ± 0.000 0016 d。光谱学的后续工作证实了我们对该系统的光度分类，它可能由M0和M1矮星组成。径向速度测量使我们能够推导出组成部分的质量（M1 = 0.66 ± 0.03 M <$; M2 = 0.62 ± 0.03 M <$）和半径（R1 = 0.64 ± 0.08 R <$; R2 = 0.61 ± 0.09 R <$），这与双星系统中低质量恒星的经验质量-半径关系一致。我们进行蒙特卡罗模拟的光变曲线，使我们能够发现复杂的系统参数之间的简并。这两颗恒星都有Hα发射的证据，这在早期的M型矮星中并不常见。这表明联星可能会影响低质量恒星的磁活动特性;联星中的活动可能会在孤立恒星中的发电机衰变后很长一段时间内持续存在，为下一代变率调查带来新的潜在耀斑活动前景。
We report on Two-Micron All-Sky Survey (2MASS) J01542930+0053266, a faint eclipsing system composed of two M dwarfs. The variability of this system was originally discovered during a pilot study of the 2MASS Calibration Point Source Working Data base. Additional photometry from the Sloan Digital Sky Survey yields an eight-passband light curve from which we derive an orbital period of 2.639 0157 ± 0.000 0016 d. Spectroscopic followup confirms our photometric classification of the system, which is likely composed of M0 and M1 dwarfs. Radial velocity measurements allow us to derive the masses (M1 = 0.66 ± 0.03Mסּ; M2 = 0.62 ± 0.03Mסּ) and radii (R1 = 0.64 ± 0.08Rסּ; R2 = 0.61 ± 0.09Rסּ) of the components, which are consistent with empirical mass–radius relationships for low-mass stars in binary systems. We perform Monte Carlo simulations of the light curves which allow us to uncover complicated degeneracies between the system parameters. Both stars show evidence of Hα emission, something not common in early-type M dwarfs. This suggests that binarity may influence the magnetic activity properties of low-mass stars; activity in the binary may persist long after the dynamos in their isolated counterparts have decayed, yielding a new potential foreground of flaring activity for next generation variability surveys.