Multimessenger signals of heavy axionlike particles in core-collapse supernovae: Two-dimensional simulations
Kanji Mori, Tomoya Takiwaki, Kei Kotake, Shunsaku Horiuchi
Abstract
Core-collapse supernovae are a useful laboratory to probe the nature of exotic particles. If axionlike particles (ALPs) are produced in supernovae, they can affect the transfer of energy and leave traces in observational signatures. In this work, we present results from two-dimensional supernova models including the effects of the production and the absorption of ALPs that couple with photons. It is found that the additional heating induced by ALPs can enhance the diagnostic energy of explosion, ${E}_{\mathrm{diag}}$. For example, for moderate ALP-photon coupling, we find explosion energies $\ensuremath{\sim}0.6\ifmmode\times\else\texttimes\fi{}{10}^{51}\text{ }\text{ }\mathrm{erg}$ compared to our reference model without ALPs of $\ensuremath{\sim}0.4\ifmmode\times\else\texttimes\fi{}{10}^{51}\text{ }\text{ }\mathrm{erg}$ in the first $\ensuremath{\sim}0.5\text{ }\text{ }\mathrm{s}$ postbounce explored in this work. Our findings indicate that when the coupling constant is sufficiently high, the neutrino luminosities and mean energies are decreased because of the additional cooling of the proto-neutron star via ALPs. The gravitational wave amplitude is also reduced because the mass accretion on the proto-neutron star is suppressed. Although the ALP-photon coupling can foster explodability, including enhancing the explosion energy closer to recent observations, more long-term simulations in three spatial dimensions are needed to draw robust conclusions.