TY - JOUR
T1 - The double-peaked Type Ic supernova 2019cad
T2 - another SN 2005bf-like object
AU - Gutiérrez, C. P.
AU - Bersten, M. C.
AU - Orellana, M.
AU - Pastorello, A.
AU - Ertini, K.
AU - Folatelli, G.
AU - Pignata, G.
AU - Anderson, J. P.
AU - Smartt, S.
AU - Sullivan, M.
AU - Pursiainen, M.
AU - Inserra, C.
AU - Elias-Rosa, N.
AU - Fraser, M.
AU - Kankare, E.
AU - Moran, S.
AU - Reguitti, A.
AU - Reynolds, T. M.
AU - Stritzinger, M.
AU - Burke, J.
AU - Frohmaier, C.
AU - Galbany, L.
AU - Hiramatsu, D.
AU - Howell, D. A.
AU - Kuncarayakti, H.
AU - Mattila, S.
AU - Müller-Bravo, T.
AU - Pellegrino, C.
AU - Smith, M.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - We present the photometric and spectroscopic evolution of supernova (SN) 2019cad during the first ∼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 ∼8 d, while the r-band peak occurred ∼15 d post-explosion. A second and more prominent peak is reached in all bands at ∼45 d past explosion, followed by a fast decline from ∼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 λ6355 and C II λ6580 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⊙, and an explosion energy of 3.5 × 1051 erg. The light-curve morphology can be reproduced either by a double-peaked 56Ni distribution with an external component of 0.041 M⊙, and an internal component of 0.3 M⊙ or a double-peaked 56Ni distribution plus magnetar model (P ∼ 11 ms and B ∼ 26 × 1014 G). If SN 2019cad were to suffer from significant host reddening (which cannot be ruled out), the 56Ni model would require extreme values, while the magnetar model would still be feasible.
AB - We present the photometric and spectroscopic evolution of supernova (SN) 2019cad during the first ∼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 ∼8 d, while the r-band peak occurred ∼15 d post-explosion. A second and more prominent peak is reached in all bands at ∼45 d past explosion, followed by a fast decline from ∼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 λ6355 and C II λ6580 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⊙, and an explosion energy of 3.5 × 1051 erg. The light-curve morphology can be reproduced either by a double-peaked 56Ni distribution with an external component of 0.041 M⊙, and an internal component of 0.3 M⊙ or a double-peaked 56Ni distribution plus magnetar model (P ∼ 11 ms and B ∼ 26 × 1014 G). If SN 2019cad were to suffer from significant host reddening (which cannot be ruled out), the 56Ni model would require extreme values, while the magnetar model would still be feasible.
KW - Supernovae: general
KW - Supernovae: individual: SN 2019cad
KW - UKRI
KW - STFC
UR - http://www.scopus.com/inward/record.url?scp=85108619752&partnerID=8YFLogxK
U2 - 10.1093/mnras/stab1009
DO - 10.1093/mnras/stab1009
M3 - Article
AN - SCOPUS:85108619752
SN - 0035-8711
VL - 504
SP - 4907
EP - 4922
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -