arXiv 1209.17722012-09-09astro-ph.SR

晚M矮星的Keck NIRSPEC径向速度观测

Keck NIRSPEC Radial Velocity Observations of Late-M dwarfs

Angelle Tanner, Russel White, John Bailey, Cullen Blake, Geoffery Blake, Kelle Cruz, Adam J. Burgasser, Adam Kraus

备注：: Accepted to ApJ
DOI：: 10.1088/0067-0049/203/1/10

摘要：

本文介绍了用凯克II望远镜上的NIRSPEC阶梯光谱仪对23颗晚M矮星进行红外光谱测量的结果。使用大地线进行波长校准，我们能够在一到四年的基线上实现45米/秒的测量精度。我们的样本包含两颗RV变化>1000 m/s的恒星。虽然我们需要更多的测量来确定这些RV变化是否是由于看不见的行星或恒星同伴，或者是已知困扰M矮星表面的恒星黑子的结果，但我们可以将这两个M矮星周围的任何同伴的质量上限定为<40 MJsini，RV变化<160 m/s，轨道周期为10-100天。我们还测量了晚M矮星样本中所有恒星的旋转速度，并将我们的2.0至2.4微米的多级高分辨率光谱提供给大气建模社区，以更好地了解晚M矮星的大气。

英文摘要：

We present the results of an infrared spectroscopic survey of 23 late-M dwarfs with the NIRSPEC echelle spectrometer on the Keck II telescope. Using telluric lines for wavelength calibration, we are able to achieve measurement precisions of down to 45 m/s for our late-M dwarfs over a one to four year-long baseline. Our sample contains two stars with RV variations of >1000 m/s. While we require more measurements to determine whether these RV variations are due to unseen planetary or stellar companions or are the result of starspots known to plague the surface of M dwarfs, we can place upper limits of <40 MJsini on the masses of any companions around those two M dwarfs with RV variations of <160 m/s at orbital periods of 10-100 days. We have also measured the rotational velocities for all the stars in our late-M dwarf sample and offer our multi-order, high-resolution spectra over 2.0 to 2.4 micron to the atmospheric modeling community to better understand the atmospheres of late-M dwarfs.

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