SN 2018bsz: significant dust formation in a nearby superluminous supernova
| Autor: | Lluís Galbany, Matt Nicholl, Erkki Kankare, Patricia Schady, Timo Kravtsov, Ivo R. Seitenzahl, Giorgos Leloudas, Steve Schulze, Hanindyo Kuncarayakti, Giuliano Pignata, Morgan Fraser, Roger Wesson, Sheng Yang, Kate Maguire, Erik C. Kool, Arne Rau, Eric Hsiao, Anders Jerkstrand, Mikako Matsuura, Mariusz Gromadzki, Seán Brennan, Priscila J. Pessi, Claudia P. Gutiérrez, Cosimo Inserra, Tassilo Schweyer, Ting-Wan Chen, Jesper Sollerman, Dietrich Baade, Joseph P. Anderson, Santiago González-Gaitán, Robert M. Yates, Ashley J. Ruiter, Avishay Gal-Yam, Emmy Paraskeva, R. Carini, Rubina Kotak, Chuan-Jui Li, Rupak Roy, P. A. Mazzali, Leonardo Tartaglia, M. Pursiainen, D. R. Young, T. E. Müller-Bravo, Lifan Wang |
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| Jazyk: | angličtina |
| Předmět: | |
| Zdroj: | Research Square |
| DOI: | 10.21203/rs.3.rs-872252/v1 |
| Popis: | We investigate the thermal emission and extinction from dust associated with the nearby superluminous supernova (SLSN) 2018bsz. Our dataset has daily cadence and simultaneous optical and near-infrared coverage up to ~ 100 days, together with late time (+ 1.7 yr) MIR observations. At 230 days after light curve peak the SN is not detected in the optical, but shows a surprisingly strong near-infrared excess, with r - J > 3 mag and r - Ks > 5 mag. The time evolution of the infrared light curve enables us to investigate if the mid-infrared emission is from newly formed dust inside the SN ejecta, from a pre-existing circumstellar envelope, or interstellar material heated by the radiation from the SN. We find the latter two scenarios can be ruled out, and a scenario where new dust is forming in the SN ejecta at epochs > 200 days can self-consistently reproduce the evolution of the SN flux. We can fit the spectral energy distribution well at +230 d with 5 x 10^-4 solar mass of carbon dust, increasing over the following several hundred days to 10^-2 solar mass by +535 d. SN 2018bsz is the first SLSN showing evidence for dust formation within the SN ejecta, and appears to form ten times more dust than normal core-collapse SNe at similar epochs. Together with their preference for low mass, low metallicity host galaxies, we suggest that SLSNe may be a significant contributor to dust formation in the early Universe. 14 pages and 7 figures in main text, 12 pages and 6 figures in appendix. The observational data will be updated once the paper is accepted |
| Databáze: | OpenAIRE |
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