I have 2 planets, a hot Jupiter with a standard majority Hydrogen/Helium atmosphere (Ab) & an Earth-like planet(Ac) orbiting around an orange dwarf star (A) which is very similar to Epsilon Eridani [https://en.wikipedia.org/wiki/Epsilon_Eridani] with these parameters:
A
Stellar classification: K1.5V - K2V
Luminosity: 0.36 Stellar luminosities
Mass: 0.8 Stellar masses
Radius: 0.78 Stellar radii
Temperature: 5090 Kelvin
Ab
Mass: 0.5 Jupiter masses
Radius: 2 Jupiter radii
Density: 0.24 Jupiter densities
Escape velocity: 29.78 m/s2
Temperature:1000 Kelvin
Semi-Major axis: 0.04 AU
Inclination: 62.5 degrees (open to changes very easily if necessary for stability)
Ac most parameters don't really matter, only that:
Semi-Major axis: 0.7 AU Radius: 0.8 Earth radii Atmosphere: 120% Earth atmosphere
So the question really is if the temperature is enough for hydrogen to be blasted out of Ab's atmosphere to create a long comet like tail (and if its temperature would even be 1000 Kelvin to begin with at it's distance from A). And how would this tail appear in the sky of Ac?, would it look like a simple streak or cover the entire sky?, would it be visible during both day and night? what color would it have?, would the large amounts of hydrogen have any affect on Ac's aurora's?