The Type Ia Supernova rate in the local Universe

Strigari, Louis E.

doi:10.1016/j.newar.2006.06.043

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Type Ia supernovae (SNIa) play a key role in astrophysics as premier distance indicators for cosmology (Phillips 1993; Riess et al 1998; Perlmutter et al 1999), as direct probes of low‐mass star formation rates at cosmological distances (Scannapieco & Bildsten 2005; Mannucci, Della Valle & Panagia 2006; Maoz 2008) and as significant contributors to iron‐group elements in the cosmos (Wheeler, Sneden & Truran 1989; Timmes, Woosley & Weaver 1995; Feltzing, Holmberg & Hurley 2001; Strigari 2006). Our current understanding is that there are two major progenitor systems for these events.…”

Section: Introductionmentioning

confidence: 99%

On Type Ia supernovae from the collisions of two white dwarfs

Raskin

Timmes

Scannapieco

et al. 2009

Monthly Notices of the Royal Astronomical Society: Letters

158

173

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We explore collisions between two white dwarfs as a pathway for making Type Ia supernovae (SNIa). White dwarf number densities in globular clusters allow 10-100, redshift 1 collisions per year, and observations by Chomiuk et al. of globular clusters in the nearby S0 galaxy NGC 7457 have detected what is likely to be a SNIa remnant. We carry out simulations of the collision between two 0.6 M white dwarfs at various impact parameters and mass resolutions. For impact parameters less than half the radius of the white dwarf, we find such collisions produce ≈0.4 M of 56 Ni, making such events potential candidates for underluminous SNIa or a new class of transients between Novae and SNIa.

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Section: Introductionmentioning

confidence: 99%

On Type Ia supernovae from the collisions of two white dwarfs

Raskin

Timmes

Scannapieco

et al. 2009

Monthly Notices of the Royal Astronomical Society: Letters

158

173

View full text Add to dashboard Cite

show abstract

“…Type Ia supernovae (SNeIa) are thought to be responsible for the largest contribution of irongroup elements to the early universe (Wheeler et al1989;Timmes et al 1995;Feltzing et al 2001;Strigari 2006), and they serve as direct probes of low-mass star formation rates at high redshift (Scannapieco & Bildsten 2005;Mannucci et al 2006;Maoz 2008). In addition, they have the remarkable property of being (nearly) standard candles.…”

Section: Type Ia Supernovae As Cosmological Toolsmentioning

confidence: 99%

The Progenitors of Type Ia Supernovae

Tout

White Dwarfs: Cosmological and Galactic Probes

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Type Ia supernovae are important, but mysterious cosmological tools. Their standard brightnesses have enabled cosmologists to measure extreme distances and to discover dark energy. However, the nature of their progenitor mechanisms remains elusive, with many competing models offering only partial clues to their origins. Here, type Ia supernova delay times are explored using analytical models. Combined with a new observation technique, this model places new constraints on the characteristic time delay between the formation of stars and the first type Ia supernovae. This derived delay time (500 million years) implies low-mass companions for single degenerate progenitor scenarios.In the latter portions of this dissertation, two progenitor mechanisms are simulated in detail; white dwarf collisions and mergers. From the first of these simulations, it is evident that white dwarf collisions offer a viable and unique pathway to producing type Ia supernovae.Many of the combinations of masses simulated produce sufficient quantities of 56 Ni (up to 0.51 solar masses) to masquerade as normal type Ia supernovae. Other combinations of masses produce 56 Ni yields that span the entire range of supernova brightnesses, from the very dim and underluminous, with 0.14 solar masses, to the over-bright and superluminous, with up to 1.71 solar masses. The 56 Ni yield in the collision simulations depends non-linearly on total system mass, mass ratio, and impact parameter.Using the same numerical tools as in the collisions examination, white dwarf mergers are studied in detail. Nearly all of the simulations produce merger remnants consisting of a cold, degenerate core surrounded by a hot accretion disk. The properties of these disks have strong implications for various viscosity treatments that have attempted to pin down the accretion times. Some mass combinations produce super-Chandrasekhar cores on shorter time scales than viscosity driven accretion. A handful of simulations also exhibit helium detonations on the surface of the primary that bear a resemblance to helium novae.Finally, some of the preliminary groundwork that has been laid for constructing a new numerical tool is discussed. This new tool advances the merger simulations further than any research group has done before, and has the potential to answer some of the lingering questions that the merger study has uncovered. The results of thermal diffusion tests using this tool have a remarkable correspondence to analytical predictions. master's degree in physics, to now completing my PhD dissertation. I was Evan's first graduate student, but you would think he'd been advising students for years, such was his ability to lead me to self-discovery and to intellectual fulfillment. I consider Evan a great friend of mine, and I believe this is among the most important factors that have aided me in my pursuits.

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The Type Ia Supernova rate in the local Universe

Cited by 2 publications

References 21 publications

On Type Ia supernovae from the collisions of two white dwarfs

On Type Ia supernovae from the collisions of two white dwarfs

The Progenitors of Type Ia Supernovae

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