Details

Autor(en) / Beteiligte

• Spyratos, Petros
• Nikolov, Nikolay
• Southworth, John
• Constantinou, Savvas
• Madhusudhan, Nikku
• Carter, Aarynn L
• de Mooij, Ernst J W
• Fortney, Jonathan J
• Gibson, Neale P
• Goyal, Jayesh M
• Helling, Christiane
• Mayne, Nathan J
• Mikal-Evans, Thomas

Titel

Transmission spectroscopy with VLT FORS2: a featureless spectrum for the low-density transiting exoplanet WASP-88b

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2021-09, Vol.506 (2), p.2853-2870

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• ABSTRACT 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.