A CHEWIE first bite: the transmission spectrum of WASP-69b
- University of Geneva, Observatory of Geneva, Astronomy, Switzerland (dominique.petit@unige.ch)
The CHEWIE survey (Clouds, Hazes and Elements vieWed on giant Exoplanets) aims to study the impact of the stellar environment on planet atmospheres and their aerosols at the day-night terminator through transmission spectra of planets in the Jupiter to Neptune mass range. It does this with ground-based, medium resolution observations between 330nm and 1100nm with the FORS2 instrument on the VLT. Our coverage of the optical wavelengths is complementary to upcoming JWST infrared observations. In this talk we present the first transmission spectrum of the survey, that of WASP-69b, a warm Saturn-mass planet with a puffed up atmosphere. We find that the spectrum shows the presence of aerosols and possible signs of sodium in the atmosphere, which is consistent with previous observations.
How to cite: Petit dit de la Roche, D. and Lendl, M.: A CHEWIE first bite: the transmission spectrum of WASP-69b, Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-571, https://doi.org/10.5194/epsc2022-571, 2022.
