Modelling light curves of bipolar core collapse supernovae from the equatorial plane
arXiv:2007.14021 · doi:10.3847/1538-4357/abcd9d
Abstract
We use the two-components bipolar toy model of core collapse supernova (CCSN) ejecta to fit the rapid decline from maximum luminosity in the light curve of the type IIb CCSN SN 2018gk (ASASSN-18am). In this toy model we use a template light curve from a different CCSN that is similar to SN 2018gk, but that has no rapid drop in its light curve. The bipolar morphology that we model with a polar ejecta and an equatorial ejecta increases the maximum luminosity and causes a steeper decline for an equatorial observer, relative to a similar spherical explosion. The total energy and mass of our toy model for SN 2018gk are E=5e51 erg and M=2.7Mo. This explosion energy is more than what a neutrino-driven explosion mechanism can supply, implying that jets exploded SN 2018gk. These energetic jets likely shaped the ejecta to a bipolar morphology, as our toy model requires. We crudely estimate that f=2-5% of all CCSNe show this behavior, most being hydrogen deficient (stripped-envelope) CCSNe, as we observe them from the equatorial plane. We estimate the overall fraction of CCSNe that have a pronounced bipolar morphology to be 5-15% of all CCSNe.
Accepted for publication in The Astrophysical Journal
References in corpus (14)
- Magnetorotational Core-Collapse Supernovae in Three Dimensions
- The intermediate r-process in core-collapse supernovae driven by the magneto-rotational instability
- Three-dimensional Models of Core-collapse Supernovae From Low-mass Progenitors With Implications for Crab
- LOSS Revisited - II: The relative rates of different types of supernovae vary between low- and high-mass galaxies
- Spectropolarimetry of superluminous supernovae: insight into their geometry
- Spectropolarimetry of the Type Ib/c SN 2005bf
- Asphericity, Interaction, and Dust in the Type II-P/II-L Supernova 2013ej in Messier 74
- LOSS Revisited - I: Unraveling correlations between supernova rates and galaxy properties, as measured in a reanalysis of the Lick Observatory Supernova Search
- Photospheric emission from long duration gamma-ray bursts powered by variable engines
- The imprints of the last jets in core collapse supernovae
- Implications of turbulence for jets in core-collapse supernova explosions
- Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
- Forming H-shaped and barrel-shaped nebulae with interacting jets
- Jet-shaped geometrically modified light curves of core collapse supernovae