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An Upper Limit on the Extended Helium Atmosphere of GJ 1214 bBased on observations collected at the European Southern Observatory under ESO program 087.C-0442 (PI van Boekel).
Research Notes of the AAS Pub Date : 2020-12-14 , DOI: 10.3847/2515-5172/abcfc7
D. J. M. Petit dit de la Roche , M. E. van den Ancker , P. A. Miles-Paez

The He i 10830 Å absorption line in transit spectra traces the upper atmospheres of exoplanets and their mass loss, which in turn is important in determining their evolution and demographics. We use archival VLT/X-Shooter data to set new, more sensitive limits on the extended helium atmosphere of GJ 1214 b, a sub-Neptune orbiting an M-dwarf. We determine limits for the excess absorption at 10830 Å of 0.38%0.44%, which corresponds to an extended atmosphere scale height of 0.130.14R p (95% confidence limit of <0.4R p ). This is an improvement on previous upper limits set by Crossfield et al. (2019) and shows that X-shooter is a suitable instrument for these types of observations.



中文翻译:

GJ 1214 b 扩展氦大气的上限基于欧洲南方天文台在 ESO 计划 087.C-0442 (PI van Boekel) 下收集的观测结果。

凌日光谱中的 He  i 10830 Å 吸收线可追踪系外行星的高层大气及其质量损失,这反过来又对确定它们的演化和人口统计很重要。我们使用存档的 VLT/X-Shooter 数据为 GJ 1214 b(围绕 M 矮星运行的亚海王星)的扩展氦大气设置了新的、更敏感的限制。我们确定 10830 Å 处的过量吸收限值为 0.38%0.44%,这对应于 0.130.14 R p的扩展大气尺度高度(95% 置信限 <0.4 R p)。这是对 Crossfield 等人先前设定的上限的改进。(2019 年)并表明 X-shooter 是适合此类观察的仪器。

更新日期:2020-12-14
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