文章基本信息

标题：Confirmation of WASP-107b's Extended Helium Atmosphere with Keck II/NIRSPEC
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作者：James Kirk ; Munazza K.Alam ; Mercedes López-Morales 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：3
页码：1562-1570
DOI：10.3847/1538-3881/ab6e66
语种：English
出版社：American Institute of Physics
摘要：We present the detection of helium in the extended atmosphere of the sub-Saturn WASP-107b using high-resolution (R ≈ 25,000) near-infrared spectra from Keck II/Near Infrared Echelle Spectrograph (NIRSPEC).We find peak excess absorption of 7.26% ± 0.24% (30σ) centered on the He i triplet at 10833 Å.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 the Hubble Space Telescope.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 He i.
关键词：Observational astronomy;Exoplanets