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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 2.

The left column shows the outflow temperature, pressure, velocity, and hydrogen number density profiles as a function of radius for ﹩\dot{M}=1{0}^{13}﹩ g s−1, together with the excited-state population ratio n3/n2. The dotted black line shows n3/n2 under the LTE assumption, highlighting the NLTE departure in the extended atmosphere. The right column shows the outflow model synthetic spectrum for ﹩\dot{M}=1{0}^{13}﹩ g s−1 (orange) compared with the observed line profile (black) and the emission contribution function as a function of wavelength and radius. The line core probes up to 1.8 Rp, while the double peaks probe ∼1.3 Rp.

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