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Axion-like particles (ALPs) are hypothetical bosons which may couple withphotons. Since many ALPs can be emitted from hot and dense astrophysicalplasma, nearby supernovae (SNe) are a possible probe into their propertiesincluding the ALP mass m_a and the coupling constant g_{ag} between ALPs andphotons. I calculated ALP emission from a type Ia SN (SN Ia) model with thenear-Chandrasekhar mass. It is found that the ALP luminosity from SNe Iareaches ~10^43(g_{ag}/10^-10 GeV^-1)^2 erg s^-1 if m_a < 1 MeV. Heavy ALPsemitted from SNe are unstable and decay into photons. I predict the time delayand the flux of decay photons that reach Earth from a nearby SN Ia. It is foundthat the decay photons may provide a constraint on g_{ag} which is as stringentas an SN 1987A limit if an SN Ia is located 1 kpc away or closer andnext-generation MeV gamma-ray satellites observe it ~1-10 years after theexplosion.

Heavy axion-like particles and MeV decay photons from nearby type Ia supernovae