The escaping atmospheres of hydrogen driven by stellar X-ray and extreme Ultraviolet (XUV) have been detected around some exoplanets by the excess absorption of Ly-alpha in far ultraviolet band. In the optical band the excess absorption of H-alpha is also found by the ground-based instruments. In this presentation, we will talk about the properties of exoplanetary atmosphere through modeling the Hα Transmission Spectrum.
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