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arXiv 1408.6900astro-ph.SRastro-ph.EP
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EBLM项目。II。来自SuperWASP的偏心长周期食双星系统中的一颗非常热的低质量M矮星

The EBLM project. II. A very hot, low-mass M dwarf in an eccentric and long period eclipsing binary system from SuperWASP

Y. Gómez Maqueo Chew, J. C. Morales, F. Faedi, E. García-Melendo, L. Hebb, F. Rodler, R. Deshpande, S. Mahadevan, J. McCormac, R. Barnes, A. H. M. J. Triaud, M.… 展开作者

Y. Gómez Maqueo Chew, J. C. Morales, F. Faedi, E. García-Melendo, L. Hebb, F. Rodler, R. Deshpande, S. Mahadevan, J. McCormac, R. Barnes, A. H. M. J. Triaud, M. López-Morales, I. Skillen, A. Collier Cameron, M. D. Joner, C. D. Laney, D. C. Stephens, K. G. Stassun, P. Montañés-Rodríguez

摘要:

本文给出了1 SWASPJ 011351.29 +314909.7(J 0113 +31)的基本性质,它是一个贫金属双星(-0.40 +/-0.04 dex),在偏心轨道(~0.3)上运行,轨道周期为~14.277 d。像J 0113 +31这样的绕太阳型恒星(EBLM)运行的M矮星,已经在凌日行星搜索过程中从WASP光变曲线和后续光谱中被识别出来。我们提出了第一个二进制EBLM样本进行充分分析,因此,在这里定义的方法。质量为0.945 +/- 0.045 Msun的主分量具有大半径(1.378 +/- 0.058 Rsun),表明系统相当古老,约为9.5 Gyr。M矮星的次级质量为0.186 +/- 0.010 Msun,半径为0.209 +/- 0.011 Rsun,与恒星演化模型完全一致。然而,从近红外二次食光曲线,发现M矮星的有效温度为3922 +/- 42 K,比理论模型预测的高出约600 K。我们讨论不同的情况来解释这种温度差异。J 0113 +31的情况下,我们可以测量质量,半径,温度和金属丰度,突出了导出质量,半径和温度作为M矮星的金属丰度的函数的重要性,以更好地了解最低质量的恒星。EBLM项目将确定M矮星的质量、半径、温度和金属丰度之间的关系,在主序底部提供重要的经验约束。

英文摘要:

In this paper, we derive the fundamental properties of 1SWASPJ011351.29+314909.7 (J0113+31), a metal-poor (-0.40 +/- 0.04 dex), eclipsing binary in an eccentric orbit (~0.3) with an orbital period of ~14.277 d. Eclipsing M dwarfs orbiting solar-type stars (EBLMs), like J0113+31, have been identified from WASP light curves and follow-up spectroscopy in the course of the transiting planet search. We present the first binary of the EBLM sample to be fully analysed, and thus, define here the methodology. The primary component with a mass of 0.945 +/- 0.045 Msun has a large radius (1.378 +/- 0.058 Rsun) indicating that the system is quite old, ~9.5 Gyr. The M-dwarf secondary mass of 0.186 +/- 0.010 Msun and radius of 0.209 +/- 0.011 Rsun are fully consistent with stellar evolutionary models. However, from the near-infrared secondary eclipse light curve, the M dwarf is found to have an effective temperature of 3922 +/- 42 K, which is ~600 K hotter than predicted by theoretical models. We discuss different scenarios to explain this temperature discrepancy. The case of J0113+31 for which we can measure mass, radius, temperature and metallicity, highlights the importance of deriving mass, radius and temperature as a function of metallicity for M dwarfs to better understand the lowest mass stars. The EBLM Project will define the relationship between mass, radius, temperature and metallicity for M dwarfs providing important empirical constraints at the bottom of the main sequence.

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