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Transmission spectroscopy with VLT FORS2: a featureless spectrum for the low-density transiting exoplanet WASP-88b
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-06-28 , DOI: 10.1093/mnras/stab1847
Petros Spyratos 1 , Nikolay Nikolov 2 , John Southworth 1 , Savvas Constantinou 3 , Nikku Madhusudhan 3 , Aarynn L Carter 4 , Ernst J W de Mooij 5 , Jonathan J Fortney 4 , Neale P Gibson 6 , Jayesh M Goyal 7 , Christiane Helling 8 , Nathan J Mayne 9 , Thomas Mikal-Evans 10
Affiliation  

We present ground-based optical transmission spectroscopy of the low-density hot Jupiter WASP-88b covering the wavelength range of 4413−8333 Å with the FOcal Reducer Spectrograph (FORS2) on the Very Large Telescope. The FORS2 white light curves exhibit a significant time-correlated noise that we model using a Gaussian process and remove as a wavelength-independent component from the spectroscopic light curves. We analyse complementary photometric observations from the Transiting Exoplanet Survey Satellite and refine the system properties and ephemeris. We find a featureless transmission spectrum with increased absorption towards shorter wavelengths. We perform an atmospheric retrieval analysis with the aura code, finding tentative evidence for haze in the upper atmospheric layers and a lower likelihood for a dense cloud deck. While our retrieval analysis results point towards clouds and hazes, further evidence is needed to definitively reject a clear-sky scenario.

中文翻译:

VLT FORS2 的透射光谱:低密度凌日系外行星 WASP-88b 的无特征光谱

我们展示了低密度热木星 WASP-88b 的地面光学透射光谱,其波长范围为 4413-8333 Å,并使用超大望远镜上的焦减光谱仪 (FORS2)。FORS2 白光曲线表现出显着的时间相关噪声,我们使用高斯过程对其进行建模,并从光谱光曲线中将其作为与波长无关的分量移除。我们分析来自凌日系外行星调查卫星的互补光度观测,并改进系统属性和星历。我们发现了一种无特征的透射光谱,其对较短波长的吸收增加。我们使用光环代码进行大气反演分析,发现高层大气中有雾霾的初步证据和密集云层的可能性较低。
更新日期:2021-06-28
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