用Gemini积分场光谱仪NIFS对GQ Lup b的近红外观测
Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS
摘要：
我们提出了新的JHK光谱（R ~ 5000）的GQ Lup b，获得了近红外积分场光谱仪NIFS和自适应光学系统ALTAIR在双子座北望远镜。角微分成像被用于在J和H波段抑制斑点噪声从GQ Lup A，我们表明，这种方法可以提供改善信噪比（S/N）的一个因素2 - 6位于亚角秒分离的同伴。根据高质量的观测数据和GAIA合成光谱，我们估计伴星的有效温度为Teff = 2400 +/- 100 K，重力为log g = 4.0 +/- 0.5，光度为log（L/L_s）= -2.47 +/- 0.28。与DUSTY演化轨迹的预测相比，我们可以将GQ Lup b的质量限制在8 - 60 MJup，最有可能是在褐矮星制度中。与Seifahrt等人发表的光谱相比，我们的GQ Lup b的光谱明显偏红（15 - 50%），并且没有显示出重要的Paβ发射。我们的光谱是在很好的协议与较低的S/N光谱先前公布的McEllington和合作者。
英文摘要：
We present new JHK spectroscopy (R ~ 5000) of GQ Lup b, acquired with the near-infrared integral field spectrograph NIFS and the adaptive optics system ALTAIR at the Gemini North telescope. Angular differential imaging was used in the J and H bands to suppress the speckle noise from GQ Lup A; we show that this approach can provide improvements in signal-to-noise ratio (S/N) by a factor of 2 - 6 for companions located at subarcsecond separations. Based on high quality observations and GAIA synthetic spectra, we estimate the companion effective temperature to Teff = 2400 +/- 100 K, its gravity to log g = 4.0 +/- 0.5, and its luminosity to log(L/L_s) = -2.47 +/- 0.28. Comparisons with the predictions of the DUSTY evolutionary tracks allow us to constrain the mass of GQ Lup b to 8 - 60 MJup, most likely in the brown dwarf regime. Compared with the spectra published by Seifahrt and collaborators, our spectra of GQ Lup b are significantly redder (by 15 - 50%) and do not show important Paβemission. Our spectra are in excellent agreement with the lower S/N spectra previously published by McElwain and collaborators.
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