Cosmic Chandlery with Thermonuclear Supernovae

Calder, A. C.; Krueger, Brendan K.; Jackson, Aaron P.; Willcox, Donald E.; Miles, Broxton J.; Townsley, Dean M.

doi:10.1088/1742-6596/837/1/012005

J. Phys.: Conf. Ser.

2017

DOI: 10.1088/1742-6596/837/1/012005

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Cosmic Chandlery with Thermonuclear Supernovae

A. C. Calder¹,

Brendan K. Krueger²,

Aaron P. Jackson³

et al.

Abstract: Thermonuclear (Type Ia) supernovae are bright stellar explosions, the light curves of which can be calibrated to allow for use as "standard candles" for measuring cosmological distances. Contemporary research investigates how the brightness of an event may be influenced by properties of the progenitor system that follow from properties of the host galaxy such as composition and age. The goals are to better understand systematic effects and to assess the intrinsic scatter in the brightness, thereby reducing unc… Show more

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SN Ia Explosions from Hybrid Carbon–Oxygen–Neon White Dwarf Progenitors that Have Mixed during Cooling

Augustine

Willcox

Brooks

et al. 2019

ApJ

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The creation of “hybrid” white dwarfs, made of a C–O core within an O–Ne shell has been proposed, and studies indicate that ignition in the C-rich central region makes these viable progenitors for thermonuclear (type Ia) supernovae. Recent work found that the C–O core is mixed with the surrounding O–Ne as the white dwarf cools prior to accretion, which results in lower central C fractions in the massive progenitor than previously assumed. To further investigate the efficacy of hybrid white dwarfs as progenitors of thermonuclear supernovae, we performed simulations of thermonuclear supernovae from a new series of hybrid progenitors that include the effects of mixing during cooling. The progenitor white dwarf model was constructed with the one-dimensional stellar evolution code Modules for Experiments in Stellar Astrophysics (MESA) and represented a star evolved through the phase of unstable interior mixing followed by accretion until it reached conditions for the ignition of carbon burning. This MESA model was then mapped to a two-dimensional initial condition for explosions simulated with FLASH. For comparison, similar simulations were performed for a traditional C–O progenitor white dwarf. By comparing the yields of the explosions, we find that, as with earlier studies, the lower C abundance in the hybrid progenitor compared to the traditional C–O progenitor leads to a lower average yield of . Although the unmixed hybrid white dwarf showed a similar decrement also in total iron-group yield, the mixed case does not and produces a smaller fraction of iron-group elements in the form of . We attribute this to the higher central density required for ignition and the location, center or off-center, of deflagration ignition.

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SN Ia Explosions from Hybrid Carbon–Oxygen–Neon White Dwarf Progenitors that Have Mixed during Cooling

Augustine

Willcox

Brooks

et al. 2019

ApJ

View full text Add to dashboard Cite

show abstract

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Cosmic Chandlery with Thermonuclear Supernovae

Cited by 1 publication

References 78 publications

SN Ia Explosions from Hybrid Carbon–Oxygen–Neon White Dwarf Progenitors that Have Mixed during Cooling

SN Ia Explosions from Hybrid Carbon–Oxygen–Neon White Dwarf Progenitors that Have Mixed during Cooling

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