A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

The double-peaked Type Ic supernova 2019cad: another SN 2005bf-like object

Julkaisun tekijät: Gutierrez CP, Bersten MC, Orellana M, Pastorello A, Ertini K, Folatelli G, Pignata G, Anderson JP, Smartt S, Sullivan M, Pursiainen M, Inserra C, Elias-Rosa N, Fraser M, Kankare E, Moran S, Reguitti A, Reynolds TM, Stritzinger M, Burke J, Frohmaier C, Galbany L, Hiramatsu D, Howell DA, Kuncarayakti H, Mattila S, Muller-Bravo T, Pellegrino C, Smith M


Julkaisuvuosi: 2021

Journal: Monthly Notices of the Royal Astronomical Society


Lehden akronyymi: MON NOT R ASTRON SOC

Volyymi: 504

Sivujen määrä: 16

ISSN: 0035-8711

eISSN: 1365-2966

DOI: http://dx.doi.org/10.1093/mnras/stab1009

We present the photometric and spectroscopic evolution of supernova (SN) 2019cad during the first similar to 100 d from explosion. Based on the light-curve morphology, we find that SN 2019cad resembles the double-peaked Type Ib/c SN 2005bf and the Type Ic PTF11mnb. Unlike those two objects, SN 2019cad also shows the initial peak in the redder bands. Inspection of the g-band light curve indicates the initial peak is reached in similar to 8 d, while the r-band peak occurred similar to 15 d post-explosion. A second and more prominent peak is reached in all bands at similar to 45 d past explosion, followed by a fast decline from similar to 60 d. During the first 30 d, the spectra of SN 2019cad show the typical features of a Type Ic SN, however, after 40 d, a blue continuum with prominent lines of Si II lambda 6355 and C II lambda 6580 is observed again. Comparing the bolometric light curve to hydrodynamical models, we find that SN 2019cad is consistent with a pre-SN mass of 11 M-circle dot, and an explosion energy of 3.5 x 10(51) erg. The light-curve morphology can be reproduced either by a double-peaked Ni-56 distribution with an external component of 0.041 M-circle dot, and an internal component of 0.3 M-circle dot or a double-peaked Ni-56 distribution plus magnetar model (P similar to 11 ms and B similar to 26 x 10(14) G). If SN 2019cad were to suffer from significant host reddening (which cannot be ruled out), the Ni-56 model would require extreme values, while the magnetar model would still be feasible.

Ladattava julkaisu

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.

Last updated on 2022-10-01 at 16:24