arXiv 1012.48822010-12-22astro-ph.EP

晚M矮星的NIRSPEC径向速度测量

NIRSPEC Radial Velocity Measurements of Late-M Dwarfs

A. Tanner, R. White, J. Bailey, T. Barman

备注：: Contribution to Proceedings of Cool Stars 16 Workshop

摘要：

随着2010年十年期巡天的重点是探测类地行星，以及2008年系外行星工作队的重点是寻找M矮星周围的行星，使用红外阶梯光谱仪的径向速度巡天将对未来系外行星研究产生重大影响。在这里，我们提出的结果，红外径向速度调查的样本14晚M矮星与NIRSPEC阶梯光谱仪的凯克II望远镜。使用大地线进行波长校准，我们能够在一年的时间内实现150-300米/秒的测量精度。虽然我们需要更多的RV时期来确定我们的大多数恒星是否有行星质量的同伴，但我们已经将样本子集周围行星质量的上限定为5-10 MJ。我们还确定了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建模社区，以更好地了解晚M矮星的大气。

英文摘要：

With an emphasis in detecting Earth-like planets set forth by the 2010 Decadal Survey and in searching for planets around M dwarfs set forth by the 2008 Exoplanet Task Force, radial velocity surveys with infrared echelle spectrometers will have a significant impact on future exoplanet studies. Here, we present the results of an infrared radial velocity survey of a sample of 14 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 150-300 m/s over a year-long timeframe. While we require more RV epochs to determine whether most of our stars have planetary-mass companions, we have placed upper limits of 5-10 MJ on the masses of planets around a sub-set of our sample. We have also determined the rotational velocities for all the stars in the sample and offer our multi-order, high-resolution spectra over 2.0 to 2.4 micron to the modeling community to better understand the atmospheres of late-M dwarfs.

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