SIMBAD references

2020MNRAS.499..974G - Mon. Not. R. Astron. Soc., 499, 974-992 (2020/November-3)

SN 2017ivv: two years of evolution of a transitional Type II supernova.

GUTIERREZ C.P., PASTORELLO A., JERKSTRAND A., GALBANY L., SULLIVAN M., ANDERSON J.P., TAUBENBERGER S., KUNCARAYAKTI H., GONZALEZ-GAITAN S., WISEMAN P., INSERRA C., FRASER M., MAGUIRE K., SMARTT S., MULLER-BRAVO T.E., ARCAVI I., BENETTI S., BERSIER D., BOSE S., BOSTROEM K.A., BURKE J., CHEN P., CHEN T.-W., DELLA VALLE M., DONG S., GAL-YAM A., GROMADZKI M., HIRAMATSU D., HOLOIEN T.W.-S., HOSSEINZADEH G., HOWELL D.A., KANKARE E., KOCHANEK C.S., McCULLY C., NICHOLL M., PIGNATA G., PRIETO J.L., SHAPPEE B., TAGGART K., TOMASELLA L., VALENTI S. and YOUNG D.R.

Abstract (from CDS):

We present the photometric and spectroscopic evolution of the Type II supernova (SN II) SN 2017ivv (also known as ASASSN-17qp). Located in an extremely faint galaxy (M_r = -10.3 mag), SN 2017ivv shows an unprecedented evolution during the 2 yr of observations. At early times, the light curve shows a fast rise (∼6-8 d) to a peak of M^ max^_g= -17.84 mag, followed by a very rapid decline of 7.94 ± 0.48 mag per 100 d in the V band. The extensive photometric coverage at late phases shows that the radioactive tail has two slopes, one steeper than that expected from the decay of ⁵⁶Co (between 100 and 350 d), and another slower (after 450 d), probably produced by an additional energy source. From the bolometric light curve, we estimated that the amount of ejected ⁵⁶Ni is ∼0.059 ± 0.003 M☉. The nebular spectra of SN 2017ivv show a remarkable transformation that allows the evolution to be split into three phases: (1) Hα strong phase (<200 d); (2) Hα weak phase (between 200 and 350 d); and (3) Hα broad phase (>500 d). We find that the nebular analysis favours a binary progenitor and an asymmetric explosion. Finally, comparing the nebular spectra of SN 2017ivv to models suggests a progenitor with a zero-age main-sequence mass of 15-17 M_☉.

Journal keyword(s): techniques: photometric - techniques: spectroscopic - surveys - supernovae: general

Simbad objects: 41

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