The electron-capture origin of supernova 2018zd

@article{Hiramatsu2021TheEO,
  title={The electron-capture origin of supernova 2018zd},
  author={Daichi Hiramatsu and D. Andrew Howell and Schuyler D. van Dyk and Jared A. Goldberg and Kei-ichi Maeda and Takashi J. Moriya and Nozomu Tominaga and Ken’ichi Nomoto and Griffin Hosseinzadeh and Iair Arcavi and Curtis McCully and Jamison Burke and K. Azalee Bostroem and Stefano Valenti and Yize Dong and Peter. J. Brown and Jennifer E. Andrews and Christopher Bilinski and G. Grant Williams and Paul S. Smith and Nathan Smith and David. J. Sand and Gagandeep S. Anand and Chengyuan Xu and Alexei V. Filippenko and Melina C. Bersten and Gast{\'o}n Folatelli and Patrick L. Kelly and T. Noguchi and Koichi Itagaki},
  journal={Nature Astronomy},
  year={2021}
}
There are two well-understood regimes of stellar death, although the transition has remained unresolved for 40 years. Stars up to about 8 solar masses lose their outer layers and leave behind a degenerate core -- a white dwarf. More massive stars (above $\sim$ 10 solar masses) produce an iron core, which collapse to a neutron star or black hole in a core-collapse supernova. Theoretically, stars in between ($\sim$ 8--10 solar masses) are expected to produce an electron-capture supernova when the… 

SN 2020jfo: A Short-plateau Type II Supernova from a Low-mass Progenitor

We present spectroscopic and photometric observations of the Type IIP supernova, SN 2020jfo, in ultraviolet and optical wavelengths. SN 2020jfo occurred in the spiral galaxy M61 (NGC 4303), with

Weak Mass Loss from the Red Supergiant Progenitor of the Type II SN 2021yja

We present high-cadence optical, ultraviolet (UV), and near-infrared data of the nearby (D ≈ 23 Mpc) Type II supernova (SN) 2021yja. Many Type II SNe show signs of interaction with circumstellar

Calibration-TOM: managing calibration observations for a global network of telescopes

Las Cumbres Observatory comprises 25 robotic telescopes hosting 6 instrument types at 7 sites. To manage the calibrations for such a large suite of instruments, LCO has developed a Target and

A precursor interpretation for the Crab supernova 1054 A.D. very early light curve

  • J. Horvath
  • Physics
    Astrophysics and Space Science
  • 2022
In spite that the Crab supernova in 1054 A.D. was studied over the years, it is still not clear what type of event produced the explosion. The most detailed and reliable source of the observed light

The Circumstellar Material around the Type IIP SN 2021yja

The majority of Type II-plateau supernovae (SNe IIP) have light curves that are not compatible with the explosions of stars in a vacuum; instead, the light curves require the progenitors to be

Nuclear weak rates and nuclear weak processes in stars

Low-Energy Supernovae Severely Constrain Radiative Particle Decays.

The hot and dense core formed in the collapse of a massive star is a powerful source of hypothetical feebly interacting particles such as sterile neutrinos, dark photons, axionlike particles (ALPs),

Properties of Type Ibn Supernovae: Implications for the Progenitor Evolution and the Origin of a Population of Rapid Transients

Type Ibn supernovae (SNe Ibn) show signatures of strong interaction between the SN ejecta and hydrogen-poor circumstellar matter (CSM). Deriving the ejecta and CSM properties of SNe Ibn provides a

Memory-triggered supernova neutrino detection

We demonstrate that observations of the gravitational memory from core collapse supernovae at future Deci-Hz interferometers enable time-triggered searches of supernova neutrinos at Mt-scale

Final Moments. I. Precursor Emission, Envelope Inflation, and Enhanced Mass Loss Preceding the Luminous Type II Supernova 2020tlf

We present panchromatic observations and modeling of supernova (SN) 2020tlf, the first normal Type II-P/L SN with confirmed precursor emission, as detected by the Young Supernova Experiment transient

References

SHOWING 1-10 OF 157 REFERENCES

A VERY LOW MASS OF 56Ni IN THE EJECTA OF SN 1994W

We present spectroscopic and photometric observations of the luminous narrow-line Type IIP (plateau) supernova 1994W. After the plateau phase days), the light curve dropped by D3.5 mag (t Z 120 in V

SN 2018zd: an unusual stellar explosion as part of the diverse Type II Supernova landscape

We present extensive observations of SN 2018zd covering the first $\sim450$\,d after the explosion. This SN shows a possible shock-breakout signal $\sim3.6$\,hr after the explosion in the unfiltered

The Value of Progenitor Radius Measurements for Explosion Modeling of Type II-Plateau Supernovae

Using Modules for Experiments in Stellar Astrophysics (MESA)+STELLA, we show that very different physical models can adequately reproduce a specific observed Type II-Plateau supernova (SN). We

The Carnegie Supernova Project II. Observations of the intermediate luminosity red transient SNhunt120

We present multi-wavelength observations of two gap transients followed by the Carnegie Supernova Project-II and supplemented with data obtained by a number of different programs. Here in the first

Progenitors of early-time interacting supernovae

We compute an extensive set of early-time spectra of supernovae interacting with circumstellar material using the radiative transfer code CMFGEN. Our models are applicable to events observed from 1

A new mass-loss rate prescription for red supergiants

Evolutionary models have shown the substantial effect that strong mass-loss rates ($\dot{M}$s) can have on the fate of massive stars. Red supergiant (RSG) mass-loss is poorly understood

Modeling Dust and Starlight in Galaxies Observed by Spitzer and Herschel: The KINGFISH Sample

Interstellar dust and starlight are modeled for the galaxies of the project “Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel.” The galaxies were observed by the Infrared Array

Luminous Type II supernovae for their low expansion velocities

We present optical and near-infrared data of three Type II supernovae (SNe II), SN 2008bm, SN 2009aj, and SN 2009au. These SNe display the following common characteristics: signs of early

A New Model for Electron-capture Supernovae in Galactic Chemical Evolution

We examine the contribution of electron-capture supernovae (ECSNe), low-mass SNe from collapsing Fe cores (FeCCSNe), and rotating massive stars to the chemical composition of the Galaxy. Our model

Mass discrepancy analysis for a select sample of Type II-Plateau supernovae

The detailed study of supernovae (SNe) and their progenitors allows a better understanding of the evolution of massive stars and how these end their lives. Despite its importance, the range of
...