Characterising the atmospheres of the two warm Neptune-like planets HD 106315 c and HD 3167 c with the HST/WFC3 Camera
Abstract
We present an atmospheric characterisation of two intermediate-sized planets: HD 106315 c (R$_{\rm P}$=4.98$\pm$0.23 R$_{\oplus}$) and HD 3167 c (R$_{\rm P}$=2.74$\pm$0.11 R$_{\oplus}$) whose results have been published in the ARES IV article, i.e Guilluy et al 2020. We analysed spatially scanned spectroscopic observations obtained with the G141 grism (1.125 - 1.650 ${\rm \mu}$m) of the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope. We use the publicly available \verb+Iraclis+ pipeline and TauREx3 atmospheric retrieval code and we found a strong water spectroscopic signature in HD 106315 c transmission spectrum corresponding to an abundance of log (H$_2$O)=−2.1$\pm$0.7 (5.7$\sigma$). We also found evidences of water and carbon dioxide in HD 3167 c' s atmosphere with log (H$_2$O)=−4.1$\pm$0.9 (3.2$\sigma$) and log (CO$_2$)=−2.4$\pm$0.7 (3.3$\sigma$). Different scenarios including additional contribution of clouds, ammonia and carbon bearing species are discussed. HD 106315 c and HD 3167 c will be interesting targets for upcoming telescopes such as the James Webb Space Telescope (JWST) and the Atmospheric Remote-Sensing Infrared Exoplanet Large-Survey (ARIEL).
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E.498G