The nearby He-rich superluminous supernova SN 2021bnw during photospheric phases
INAF - Osservatorio Astronomico d’Abruzzo（意大利国家天体物理研究所阿布鲁佐天文台）；INAF - Osservatorio Astronomico di Padova（意大利国家天体物理研究所帕多瓦天文台）；Dipartimento di Fisica, “Sapienza” Università di Roma & Sezione INFN Roma1（罗马大学物理系及INFN罗马第一分所）；Caltech Optical Observatories, California Institute of Technology（加州理工学院光学观测站）；National Research Center, Kurchatov Institute（库尔恰托夫研究所国家研究中心）；Lebedev Physical Institute, Russian Academy of Sciences（俄罗斯科学院列别杰夫物理研究所）；M.V. Lomonosov Moscow State University, Sternberg Astronomical Institute（莫斯科国立大学谢尔盖天文研究所）；Yunnan Observatories, Chinese Academy of Sciences（中国科学院云南天文台）；International Centre of Supernovae, Yunnan Key Laboratory（云南省超新星国际研究中心）；Graduate Institute of Astronomy, National Central University（中央大学天文学研究所）
A. Fiore, A. Kozyreva, L. Yan, S. Benetti, J. P. Anderson, P. Baklanov, Y. -Z. Cai, E. Cappellaro, T. -W. Chen, N. Elias-Rosa, A. Gal-Yam, M. J. Graham, M. Grom… 展开作者
A. Fiore, A. Kozyreva, L. Yan, S. Benetti, J. P. Anderson, P. Baklanov, Y. -Z. Cai, E. Cappellaro, T. -W. Chen, N. Elias-Rosa, A. Gal-Yam, M. J. Graham, M. Gromadzki, S. L. Groom, C. P. Gutiérrez, D. Hiramatsu, D. A. Howell, C. Inserra, M. M. Kasliwal, R. Könyves-Tóth, P. Lundqvist, C. McCully, A. Mironov, S. Moran, T. E. Müller-Bravo, M. Newsome, M. Nicholl, P. Ochner, E. Padilla Gonzalez, P. J. Pessi, G. Pignata, F. Ragosta, A. Reguitti, T. M. Reynolds, R. L. Riddle, B. Rusholme, I. Salmaso, S. Schulze, J. Sollerman, L. Tomasella, D. Warshofsky, S. Yang, D. R. Young
备注：
14 pages, 12 figures, 4 tables. Accepted for publication in A&A; matches the final version in A&A
Aim. We present and interpret the data of the nearby hydrogen-deficient but helium-rich superluminous supernova SN 2021bnw which reached a magnitude of -20.7 at maximum luminosity in g band. Methods. We discuss the light curves and spectra of SN 2021bnw based on its spectro-photometric follow up exploiting different observational facilities. We reproduce the NIR spectrum of SN 2021bnw with TARDIS to inspect the chemical composition at late photospheric phases and identify helium features. We also use a STELLA model coupling hydrodynamics and radiation transport to constrain the physical parameters of the explosion assmunig a 56Ni+CSM scenario. Results. We suggest that SN 2021bnw was mainly powered by the interaction of the ejecta with a previously lost He-rich circumstellar material, coupled with a central power source. Conclusions. This work expands the data sample of He-rich superluminous supernovae rich (SLSNe Ib) and, assuming a single progenitor scenario, can constrain the masses and the physics of their progenitors.
The Type I Superluminous Supernova Catalogue II: Spectroscopic Evolution in the Photospheric Phase, Velocity Measurements, and Constraints on Diversity
