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X-Ray and UV Observations of the Young Sun HIP 67522: Evidence of Lyα Absorption within the Planetary System

  • Authors: Cynthia S. Froning, Allison Youngblood, David J. Wilson, Girish M. Duvvuri, Kevin France, P. Christian Schneider, J. Sebastian Pineda, Alexander Brown, Angeli Sandoval, Thomas Ayres

Cynthia S. Froning et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 9.

The SED of HIP 67522 compared to the present-day Sun. Shown in blue in the upper panel is the SED of the 17 Myr old star, HIP 67522. Overlaid in yellow is the SED of the Sun from T. N. Woods et al. (2009). For HIP 67522, the fluxes are scaled to an Earth-equivalent instellation distance. In the lower panel, the ratio of the two spectra is shown, displaying the dramatic increase in XUV emission in the younger star.

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