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The Transitional Type Ibn/IIn SN 2022pda, with Pre-explosion Outbursts and a Double-peaked Light Curve

  • Authors: Y.-Z. Cai, 永志 蔡, A. Pastorello, R. Chiba, T. J. Moriya, A. Reguitti, L. Tartaglia, S. Moran, S. Campana, Z.-Y. Wang, J.-W. Zhao, J. P. Anderson, S. Benetti, S. J. Brennan, E. Cappellaro, K. C. Chambers, T.-W. Chen, Z.-H. Chen, T. de Boer, Y.-Z. Dong, J. Duarte, N. Elias-Rosa, M. Fraser, W.-P. Gan, H. Gao, M. Gromadzki, G. Hosseinzadeh, D. A. Howell, C. Inserra, T. Kangas, E. Kankare, T. Kravtsov, L.-P. Li, C.-C. Lin, T. B. Lowe, P. Lundqvist, E. A. Magnier, K. Matilainen, P. A. Mazzali, C. McCully, P. Minguez, T. E. Müller-Bravo, M. Newsome, E. Padilla Gonzalez, C. Pellegrino, P. J. Pessi, T. Petrushevska, G. Pignata, R. P. Santos, S. Schulze, S. J. Smartt, I. A. Smith, K. W. Smith, J. Sollerman, S. Srivastav, M. D. Stritzinger, G. Terreran, G. Valerin, R. Wainscoat, S.-Q. Wang, 善钦 王, D. R. Young, L. Galbany, Z. Li, I. Salmaso, S. Zha, 帅 查, J.-M. Bai, 金明 白, B. Wang, 博 王, X.-F. Wang, 晓锋 王, J.-J. Zhang, 居甲 张

Y.-Z. Cai et al 2026 The Astrophysical Journal Letters 1004 .

  • Provider: AAS Journals

Caption: Figure 3.

Spectroscopic evolution of SN 2022pda. Top panel: sequence of optical spectra between phases −9.3 days and +72 days. Vertical lines mark the positions of the most prominent Balmer and He I  lines. Middle panel: identification of the most prominent lines in the blue part (3800–5200 Å) of the Very Large Telescope (VLT)/X-Shooter spectrum obtained on 2022 September 29. Bottom panel: identification on the −5.6 day VLT/X-Shooter NIR spectrum. This spectrum has been binned to 20 Å to increase the signal-to-noise ratio (S/N). Reddening and redshift corrections have been applied in all spectra. The positions of most significant telluric bands are marked with the symbol ‘⊕’. Some lower S/N spectra are not shown in this figure, while they are listed in the Table 2 (Appendix A.3).

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