scholarly journals A type Ia supernova at the heart of superluminous transient SN 2006gy

Science ◽  
2020 ◽  
Vol 367 (6476) ◽  
pp. 415-418 ◽  
Author(s):  
Anders Jerkstrand ◽  
Keiichi Maeda ◽  
Koji S. Kawabata
Keyword(s):  
Binary System ◽  
Light Curve ◽  
Supernova Explosion ◽  
Large Mass ◽  
Late Time ◽  
Standard Type ◽  
Circumstellar Material ◽  
Common Envelope ◽  
Type Ia Supernova ◽  
Type Ia

Superluminous supernovae radiate up to 100 times more energy than normal supernovae. The origin of this energy and the nature of the stellar progenitors of these transients are poorly understood. We identify neutral iron lines in the spectrum of one such supernova, SN 2006gy, and show that they require a large mass of iron (≳0.3 solar masses) expanding at 1500 kilometers per second. By modeling a standard type Ia supernova hitting a shell of circumstellar material, we produce a light curve and late-time iron-dominated spectrum that match the observations of SN 2006gy. In such a scenario, common envelope evolution of a progenitor binary system can synchronize envelope ejection and supernova explosion and may explain these bright transients.

Early Blue Excess from the Type Ia Supernova 2017cbv

2017 ◽  
Vol 14 (S339) ◽  
pp. 47-49
Author(s):  
G. Hosseinzadeh
Keyword(s):  
Light Curve ◽  
Standard Type ◽  
Circumstellar Material ◽  
Type Ia Supernova ◽  
Unusual Distribution ◽  
Photometric Observations ◽  
Type Ia ◽  
Optical Light Curve ◽  
Ia Supernovae

AbstractThis paper presented very early, high-cadence photometric observations of the nearby Type Ia SN 2017cbv. The light-curve is unique in that during the first five days of observations it has a blue bump in the U, B, and g bands which is clearly resolved by virtue of our photometric cadence of 5.7 hr during that time span. We modelled the light-curve as the combination of an early shock of the supernova ejecta against a non-degenerate companion star plus a standard Type Ia supernova component. Our best-fit model suggested the presence of a subgiant star 56 R⊙ from the exploding white dwarf, although that number is highly model-dependent. While the model matches the optical light-curve well, it over-predicts the flux expected in the ultraviolet bands. That may indicate that the shock is not a blackbody, perhaps because of line blanketing in the UV. Alternatively, it could point to another physical explanation for the optical blue bump, such as interaction with circumstellar material or an unusual distribution of the element Ni. Early optical spectra of SN 2017cbv show strong carbon absorption as far as day –13 with respect to maximum light, suggesting that the progenitor system contained a significant amount of unburnt material. These results for SN 2017cbv illustrate the power of early discovery and intense follow-up of nearby supernovæ for resolving standing questions about the progenitor systems and explosion mechanisms of Type Ia supernovæ.

scholarly journals The late-time light curve of the Type Ia supernova SN 2011fe

2017 ◽  
Vol 468 (4) ◽  
pp. 3798-3812 ◽  
Author(s):  
G. Dimitriadis ◽  
M. Sullivan ◽  
W. Kerzendorf ◽  
A. J. Ruiter ◽  
I. R. Seitenzahl ◽  
...  
Keyword(s):  
Light Curve ◽  
Late Time ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals Using late-time optical and near-infrared spectra to constrain Type Ia supernova explosion properties

2018 ◽  
Vol 477 (3) ◽  
pp. 3567-3582 ◽  
Author(s):  
K Maguire ◽  
S A Sim ◽  
L Shingles ◽  
J Spyromilio ◽  
A Jerkstrand ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Near Infrared ◽  
Supernova Explosion ◽  
Late Time ◽  
Type Ia Supernova ◽  
Near Infrared Spectra ◽  
Type Ia

scholarly journals The Progenitor of a Type Ia Supernova with a Short Delay Time?

2011 ◽  
Vol 7 (S281) ◽  
pp. 68-71
Author(s):  
S. Mereghetti ◽  
N. La Palombara ◽  
A. Tiengo ◽  
P. Esposito ◽  
L. Stella ◽  
...  
Keyword(s):  
White Dwarf ◽  
Rotational Velocity ◽  
Supernova Explosion ◽  
Short Delay ◽  
X Ray ◽  
Common Envelope ◽  
Type Ia Supernova ◽  
Short Delay Time ◽  
Type Ia ◽  
Chandrasekhar Limit

AbstractHD 49798/RX J0648.0-4418 is the only known X-ray binary composed of a hot subdwarf and a massive white dwarf (M=1.28 ± 0.05 M⊙). This system, with an orbital period of 1.55 days, is the outcome of a common envelope evolution, most likely of a pair of stars with initial masses of ~8–10M⊙. When the hot subdwarf, currently in a He-burning phase, will expand again and fill its Roche-lobe, the enhanced mass transfer can rapidly bring the already massive white dwarf above the Chandrasekhar limit. The possible final fate, either a Type Ia supernova explosion or an accretion induced collapse, is particularly interesting in view of the high rotational velocity of this star, which has the shortest spin period (13s) observed in a white dwarf.

scholarly journals The late-time light curve of the type Ia supernova 2000cx

2004 ◽  
Vol 428 (2) ◽  
pp. 555-568 ◽  
Author(s):  
J. Sollerman ◽  
J. Lindahl ◽  
C. Kozma ◽  
P. Challis ◽  
A. V. Filippenko ◽  
...  
Keyword(s):  
Light Curve ◽  
Late Time ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals A Physical Basis for the H-band Blue-edge Velocity and Light-curve Shape Correlation in Context of Type Ia Supernova Explosion Physics

2019 ◽  
Vol 878 (2) ◽  
pp. 86 ◽  
Author(s):  
C. Ashall ◽  
P. Hoeflich ◽  
E. Y. Hsiao ◽  
M. M. Phillips ◽  
M. Stritzinger ◽  
...  
Keyword(s):  
Light Curve ◽  
Supernova Explosion ◽  
Physical Basis ◽  
Curve Shape ◽  
Blue Edge ◽  
Type Ia Supernova ◽  
Type Ia

scholarly journals THE GOLDEN STANDARD TYPE Ia SUPERNOVA 2005cf: OBSERVATIONS FROM THE ULTRAVIOLET TO THE NEAR-INFRARED WAVEBANDS

2009 ◽  
Vol 697 (1) ◽  
pp. 380-408 ◽  
Author(s):  
X. Wang ◽  
W. Li ◽  
A. V. Filippenko ◽  
R. J. Foley ◽  
R. P. Kirshner ◽  
...  
Keyword(s):  
Near Infrared ◽  
Standard Type ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Golden Standard

scholarly journals On the road to consistent Type Ia supernova explosion models

2006 ◽  
Vol 2 (14) ◽  
pp. 308-309
Author(s):  
Friedrich K. Röpke
Keyword(s):  
Three Dimensional ◽  
Supernova Explosion ◽  
The Road ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Recent Developments ◽  
Consistent Picture ◽  
On The Road ◽  
Distance Indicators ◽  
Three Dimensional Simulations

AbstractKeeping up with ever more detailed observations, Type Ia supernova (SN Ia) explosion models have seen a brisk development over the past years. The aim is to construct a self-consistent picture of the physical processes in order to gain the predictive power necessary to answer questions arising from the application of SNe Ia as cosmological distance indicators. We review recent developments in modeling these objects focusing on three-dimensional simulations.

scholarly journals Constraints on the density distribution of type Ia supernovae ejecta inferred from late-time light-curve flattening

2020 ◽  
Vol 493 (4) ◽  
pp. 5617-5624
Author(s):  
Doron Kushnir ◽  
Eli Waxman
Keyword(s):  
Light Curve ◽  
Weighted Average ◽  
Far Infrared ◽  
Average Density ◽  
Light Curves ◽  
Type Ia Supernovae ◽  
Late Time ◽  
Simple Method ◽  
Type Ia ◽  
Ia Supernovae

ABSTRACT The finite time, τdep, over which positrons from β+ decays of 56Co deposit energy in type Ia supernovae ejecta lead, in case the positrons are trapped, to a slower decay of the bolometric luminosity compared to an exponential decline. Significant light-curve flattening is obtained when the ejecta density drops below the value for which τdep equals the 56Co lifetime. We provide a simple method to accurately describe this ‘delayed deposition’ effect, which is straightforward to use for analysis of observed light curves. We find that the ejecta heating is dominated by delayed deposition typically from 600 to 1200 d, and only later by longer lived isotopes 57Co and 55Fe decay (assuming solar abundance). For the relatively narrow 56Ni velocity distributions of commonly studied explosion models, the modification of the light curve depends mainly on the 56Ni mass-weighted average density, 〈ρ〉t3. Accurate late-time bolometric light curves, which may be obtained with JWST far-infrared (far-IR) measurements, will thus enable to discriminate between explosion models by determining 〈ρ〉t3 (and the 57Co and 55Fe abundances). The flattening of light curves inferred from recent observations, which is uncertain due to the lack of far-IR data, is readily explained by delayed deposition in models with $\langle \rho \rangle t^{3} \approx 0.2\, \mathrm{M}_{\odot }\, (10^{4}\, \textrm{km}\, \textrm{s}^{-1})^{-3}$, and does not imply supersolar 57Co and 55Fe abundances.

scholarly journals A Precise Distance Indicator: Type Ia Supernova Multicolor Light‐Curve Shapes

1996 ◽  
Vol 473 (1) ◽  
pp. 88-109 ◽  
Author(s):  
Adam G. Riess ◽  
William H. Press ◽  
Robert P. Kirshner
Keyword(s):  
Light Curve ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Distance Indicator ◽  
Indicator Type
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