Feature-rich transmission spectrum for WASP-127b Cloud-free skies for the puffiest known super-Neptune?
Feature-rich transmission spectrum for WASP-127b Cloud-free skies for the puffiest known super-Neptune?
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WASP-127b 的特征丰富的传输光谱 已知最膨胀的超级海王星的无云天空？
DOI：
10.1051/0004-6361/201731018
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发表时间：
2017
影响因子：
6.5
通讯作者：
Casasayas-Barris N.
中科院分区：
文献类型：
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作者：
Palle E.;Chen G.;Prieto-Arranz J.;Nowak G.;Murgas F.;Nortmann L.;Pollacco D.;Lam K.;Montanes-Rodriguez P.;Parviainen H.;Casasayas-Barris N.
WASP-127 b是迄今为止发现的密度最低的行星之一。质量低于土星（Mp= 0.18 ± 0.02MJ）和超木星半径（Rp= 1.37 ± 0.04 RJ），它围绕一颗即将离开主序星的明亮G5星星运行。方法我们使用NOT望远镜上的ALFOSC光谱仪观察了一个低分辨率的星系，（R~ 330，见有限）长缝光谱时间序列在行星过境，并在这里提出的第一个透射光谱WASP-127b.ResultsWe发现一个强大的瑞利斜率在蓝色波长和暗示的Na吸收，虽然数据的质量不允许我们声称检测。在红波长的TiO和VO的吸收功能是最好的解释，以适应data.ConclusionsAlthough具有较高的信噪比的意见，需要最终确认的吸收功能，WASP-127 b似乎是一个无云的气氛，是最好的目标之一，在不久的将来进行进一步的表征研究。
ContextWASP-127b is a planet with one of the lowest densities discovered to date. With a sub-Saturn mass (Mp= 0.18 ± 0.02MJ) and super-Jupiter radius (Rp= 1.37 ± 0.04RJ), it orbits a bright G5 star that is about to leave the main-sequence.AimsWe aim to explore the atmosphere of WASP-127b in order to retrieve its main atmospheric components, and to find hints for its intriguing inflation and evolutionary history.MethodsWe used the ALFOSC spectrograph at the NOT telescope to observe a low-resolution (R~ 330, seeing limited) long-slit spectroscopic time series during a planetary transit, and present here the first transmission spectrum for WASP-127b.ResultsWe find a strong Rayleigh slope at blue wavelengths and a hint of Na absorption, although the quality of the data does not allow us to claim a detection. At redder wavelengths the absorption features of TiO and VO are the best explanation to fit the data.ConclusionsAlthough observations with a higher signal-to-noise ratio are needed to conclusively confirm the absorption features, WASP-127b seems to posses a cloud-free atmosphere and is one of the best targets on which to perform further characterization studies in the near future.