Type Ia supernovae and the ¹²C+¹²C reaction rate

¹ Dept. Física i Enginyeria Nuclear, Univ. Politècnica de Catalunya, Carrer Pere Serra 1-15, 08173 Sant Cugal del Vallès, Spain
e-mail: eduardo.bravo@upc.edu
² INAF – Osservatorio Astronomico di Teramo, via mentore Maggini snc, 64100 Teramo, Italy
e-mail: piersanti@oa-teramo.inaf.it; straniero@oa-teramo.inaf.it
³ INFN Sezione di Napoli, 80126 Napoli, Italy
⁴ Departamento de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain
e-mail: inma@ugr.es
⁵ Institut de Ciències de l’Espai (CSIC), Campus UAB, 08193 Bellaterra, Spain
e-mail: isern@aliga.ieec.uab.es
⁶ Institut d’Estudis Espacials de Catalunya, Ed. Nexus-201, c/Gran Capita 2-4, 08034 Barcelona, Spain
⁷ Dept. Física i Enginyeria Nuclear, Univ. Politècnica de Catalunya, Carrer Comte d’Urgell 187, 08036 Barcelona, Spain
e-mail: jose.antonio.escartin@upc.edu

Received: 3 August 2011
Accepted: 4 September 2011

Abstract

Context. Even if the ¹²C+¹²C reaction plays a central role in the ignition of type Ia supernovae (SNIa), the experimental determination of its cross-section at astrophysically relevant energies (E ≲ 2 MeV) has never been made. The profusion of resonances throughout the measured energy range has led to speculation that there is an unknown resonance at E₀ ~ 1.5 MeV possibly as strong as the one measured for the resonance at 2.14 MeV, i.e. (ωγ)_R = 0.13 meV.

Aims. We study the implications that such a resonance would have for our knowledge of the physics of SNIa, paying special attention to the phases that go from the crossing of the ignition curve to the dynamical event.

Methods. We use one-dimensional hydrostatic and hydrodynamic codes to follow the evolution of accreting white dwarfs until they grow close to the Chandrasekhar mass and explode as SNIa. In our simulations, we account for a low-energy resonance by exploring the parameter space allowed by experimental data.

Results. A change in the ¹²C+¹²C rate similar to the one explored here would have profound consequences for the physical conditions in the SNIa explosion, namely the central density, neutronization, thermal profile, mass of the convective core, location of the runaway hot spot, or time elapsed since crossing the ignition curve. For instance, with the largest resonance strength we use, the time elapsed since crossing the ignition curve to the supernova event is shorter by a factor ten than for models using the standard rate of ¹²C+¹²C, and the runaway temperature is reduced from  ~8.14 × 10⁸ K to  ~ 4.26 × 10⁸ K. On the other hand, a resonance at 1.5 MeV, with a strength ten thousand times smaller than the one measured at 2.14 MeV, but with an α/p yield ratio substantially different from 1 would have a sizeable impact on the degree of neutronization of matter during carbon simmering.

Conclusions. A robust understanding of the links between SNIa properties and their progenitors will not be attained until the ¹²C+¹²C reaction rate is measured at energies  ~1.5 MeV.