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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 5.

Luminosity distance measurements of SNe Ia at z > 1 including data from D. Brout et al. (2022). Black points (with errors) are SNe Ia with spectroscopic classifications, while blue squares (with error) are SNe Ia with photometric classifications. The two strongly lensed SNe Ia with distance measurements are shown as purple triangles. SN 2025ogs is shown as a green star, and the flat ΛCDM model (H0 = 70 km s−1 Mpc−1) is shown as a solid red line. The black stars are the distance moduli for the other z > 2 spectroscopically confirmed SNe Ia with JWST. The best-fit flat wCDM cosmological constraints from D. Brout et al. (2022, black dashed line) and DES Collaboration et al. (2024, cyan dotted line) are also shown for comparison.

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