Extended Data Fig. 3: Light curves variability.
From: Signatures of strong magnetization and a metal-poor atmosphere for a Neptune-sized exoplanet
Transit light curves of HAT-P-11 versus time variability. a, Integrated flux of C II 133.45 nm (red) and C II 133.57 nm lines (black, scaled by the two lines’ mean flux ratio ~1.41) versus time measured from the transit central time Tc. For clarity, dates of observations are only shown for the first HST orbit (time from mid-transit = -0.375), the other exposures being separated by a multiple of the HST orbit (1.5 h). b, Normalized flux of FUV chromosphere lines. We notice a flare event during the fifth HST orbit of the transit observed on December 21 2016 (blue) in the SI III and Si IV lines, an activity that is not visible in the C II lines. An extended but weaker activity also appears at most orbital phases during the May 21 2017 transit (olive) for the Si III and Si IV lines but not for the C II lines.
