Do the Helium in-transit EWs truly vary among transits 1, 2, and 3?
A varying transit signal would mean something about the helium exosphere could be changing-- it's extent, position, or opacity, for example. What physical mechanism could be giving rise to these variations, and which of our three cartoon scenarios does this observation favor?
We will want to rule-out that humdrum instrumental artifacts are not to blame, so spot-checking the spectra may be part of this exercise.
Do the Helium in-transit EWs truly vary among transits 1, 2, and 3?
A varying transit signal would mean something about the helium exosphere could be changing-- it's extent, position, or opacity, for example. What physical mechanism could be giving rise to these variations, and which of our three cartoon scenarios does this observation favor?
We will want to rule-out that humdrum instrumental artifacts are not to blame, so spot-checking the spectra may be part of this exercise.