In recent years, the LHAASO detector has opened a new window to the very and ultra-high energy Galactic gamma-ray sky, revealing numerous sources capable of emitting in this energy range. However, most of these sources remain unidentified.
At the same time, the IceCube detector has finally established the existence of a Galactic neutrino signal, which could partially originate from some of the sources observed by LHAASO.
In this context, we investigated compact binary millisecond pulsars as potential sources of very high-energy gamma-rays and neutrinos. A compact binary millisecond pulsar is a fast-spinning neutron star in a compact orbit with a low mass companion, collectively known as spider systems.
In such systems, the powerful winds from the pulsar and its companion collide, creating an intrabinary shock that can accelerate particles to enormous energies. These systems are typically considered efficient accelerators of electrons and positrons, which generate gamma-rays via synchrotron radiation and inverse Compton scattering.
In this work, we assume that protons can be extracted from the neutron star surface and subsequently accelerated at the intrabinary shock and/or within the pulsar wind.
Our results show that for very energetic spider pulsars with a large spin-down power and a large magnetic field in the companion region, the gamma-ray emission could be detectable by future gamma-ray facilities such as CTA and or even by LHAASO, while the neutrino emission could be detectable by the future TRIDENT detector.
