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SN 2025ogs: A Spectroscopically Normal Type Ia Supernova at z = 2 as a Benchmark for Redshift Evolution

  • Authors: M. R. Siebert, J. D. R. Pierel, M. Engesser, D. A. Coulter, C. DeCoursey, O. D. Fox, A. Rest, W. Chen, J. M. DerKacy, E. Egami, R. J. Foley, D. O. Jones, K. Kakiichi, A. M. Koekemoer, Z. G. Lane, C. Larison, D. C. Leonard, T. J. Moriya, E. Padilla Gonzalez, R. M. Quimby, K. Shukawa, L. G. Strolger, Yossef Zenati

M. R. Siebert et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 4.

The distributions of rest-frame B – V color at peak B-band brightness, Δm15(B), and host-galaxy properties measured for the cosmological sample of SNe Ia presented in D. Brout et al. (2022). The vertical lines with shaded 1σ uncertainties are SN 2025ogs (green solid line) and the other spectroscopic SNe Ia, namely SN 2023adsy (blue dotted line) and SN 2023aeax (red dashed line).

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