Close-in giant planets lose mass fastest when young: a 0.3-Jupiter-mass planet can lose up to 20% of its mass, a 1-Jupiter-mass planet loses under 1%, and hydrogen-alpha transit signals fade after roughly 1.2 billion years.
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Evolution of atmospheric escape in close-in giant planets and their associated Ly$\alpha$ and H$\alpha$ transit predictions
Close-in giant planets lose mass fastest when young: a 0.3-Jupiter-mass planet can lose up to 20% of its mass, a 1-Jupiter-mass planet loses under 1%, and hydrogen-alpha transit signals fade after roughly 1.2 billion years.