SN 2018bsz: significant dust formation in a nearby superluminous supernova

Leloudas G.; Matsuura M.; Li C. -J.; Maguire K.; Young D. R.; Jerkstrand A.; Gonzalez-Gaitan S.; Roy R. Ruiter A. J.; Schulze S.; Rau A.; Tartaglia L.; Inserra C.; Wesson R.; Mueller-Bravo T. E.; Anderson J. P.; Brennan S. J.; Gromadzki M.; Seitenzahl I.; Galbany L.; Kankare E.; Schweyer T.; Gal-Yam A.; Kuncarayakti H.; Kotak R.; Kravtsov T.; Schady P.; Yang S.; Sollerman J.; Kool E. C.; Pignata G.; Pursiainen M.; Chen T. -W.; Baade D.; Hsiao E. Y.; Paraskeva E.; Pessi P. J.; Mazzali P. A.; Wang L.; Carini R.; Nicholl M.; Fraser M.; Gutierrez C. P.; Yates R. M.
SN 2018bsz: significant dust formation in a nearby superluminous supernova

Leloudas G.
Matsuura M.
Li C. -J.
Maguire K.
Young D. R.
Jerkstrand A.
Gonzalez-Gaitan S.
Roy R. Ruiter A. J.
Schulze S.
Rau A.
Tartaglia L.
Inserra C.
Wesson R.
Mueller-Bravo T. E.
Anderson J. P.
Brennan S. J.
Gromadzki M.
Seitenzahl I.
Galbany L.
Kankare E.
Schweyer T.
Gal-Yam A.
Kuncarayakti H.
Kotak R.
Kravtsov T.
Schady P.
Yang S.
Sollerman J.
Kool E. C.
Pignata G.
Pursiainen M.
Chen T. -W.
Baade D.
Hsiao E. Y.
Paraskeva E.
Pessi P. J.
Mazzali P. A.
Wang L.
Carini R.
Nicholl M.
Fraser M.
Gutierrez C. P.
Yates R. M.
Katso/Avaa
Lataukset: 

Arxiv
URI
https://arxiv.org/abs/2109.07942
Näytä kaikki kuvailutiedot
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022012710630
Tiivistelmä

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.

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