Abstract A key first step to constrain the impact of energetic particles in exoplanet atmospheres is detect chemical signature ionisation due stellar and Galactic cosmic rays. We focus on GJ 436, a well-studied M dwarf with warm Neptune-like exoplanet. demonstrate how maximum particle momentum can be estimated from X-ray luminosity. model transport through atmosphere hypothetical at orbital dis...

We investigate the impact of a presumed axion-like-particle (ALP) emission in core-collapse supernova explosion on neutrino luminosities and mean energies employing relatively simple analytic description. compute nuclear Bremsstrahlung Primakoff axion as functions protoneutron star (PNS) parameters discuss how ALP compete with emission, modifying total PNS thermal energy dissipation. Our result...

The misalignment mechanism allows for the efficient, and usually very cold, production of light scalar bosons, such as axion-like particles (ALPs), making them an appealing dark matter candidate. However, in certain cases, presence a monodromy, self-interactions ALPs can be sufficiently strong that homogeneous field fragments soon after onset oscillations. resulting large inhomogeneities lead t...