论文标题
用Keck II/NIRSPEC确认WASP-107B扩展的氦气大气
Confirmation of WASP-107b's extended Helium atmosphere with Keck II/NIRSPEC
论文作者
论文摘要
我们使用高分辨率（$ r \ \ \ 25000 $）从Keck II/NIRSPEC的高分辨率（$ r \ 25000 $）介绍了子返回黄蜂-107B的扩展大气中检测氦气。我们发现，以10833a为中心的HEI三胞胎的峰值超额吸收为$ 7.26 \ pm 0.24 \％$（30 $σ$）。氦吸收曲线的幅度和形状与先前从甲壳虫和HST制造的行星中逃脱氦气的观察结果非常吻合。这表明在两年的基线中，从行星逃脱氦气的签名没有显着的时间变化。该结果表明，凯克II/NIRSPEC检测外部球星中大气逃生的能力，使其成为通过基于HEI的地面观测来进一步了解我们对外行星大气蒸发的有用工具。
We present the detection of helium in the extended atmosphere of the sub-Saturn WASP-107b using high resolution ($R \approx 25000$) near-infrared spectra from Keck II/NIRSPEC. We find peak excess absorption of $7.26 \pm 0.24\%$ (30$σ$) centered on the HeI triplet at 10833A. The amplitude and shape of the helium absorption profile is in excellent agreement with previous observations of escaping helium from this planet made by CARMENES and HST. This suggests there is no significant temporal variation in the signature of escaping helium from the planet over a two year baseline. This result demonstrates Keck II/NIRSPEC's ability to detect atmospheric escape in exoplanets, making it a useful instrument to further our understanding of the evaporation of exoplanetary atmospheres via ground-based observations of HeI.
