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Hydrogen Airglow from an Escaping Ultrahot Jupiter Atmosphere

  • Authors: Yapeng Zhang, Chenliang Huang, Aaron Householder, James E. Owen, Fei Dai, Aurora Y. Kesseli, Andrew W. Howard, Julie Inglis, Howard Isaacson, Heather A. Knutson, Dimitri Mawet, Nicole Wallack, Jerry W. Xuan, Michael Zhang, Theron W. Carmichael, Daniel Huber, Rena A. Lee, Nicholas Saunders, Lauren M. Weiss, Jingwen Zhang

Yapeng Zhang et al 2026 The Astrophysical Journal Letters 1005 .

  • Provider: AAS Journals

Caption: Figure A2.

Phase-averaged Hα line profile in the planet’s rest frame. (a) ϕ = 0.05–0.25, where the dayside is largely hidden, and no significant signal is detected. (b) ϕ = 0.30–0.45, where the dayside dominates, and the double-peaked emission with central self-absorption is detected at 10σ. Blue and orange points show the two independent spectral orders; black points are binned fluxes in every five data points.

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