Could an hypercritical accretion be associated with the atypical magnetic-field behavior in RX J0822-4300?

TL;DR

This paper models the magnetic field evolution in RX J0822-4300 using magnetohydrodynamic simulations during hypercritical accretion, suggesting neutrino detection as a signature of magnetic field submergence in CCOs.

Contribution

It introduces a numerical MHD model for magnetic field behavior in CCOs during hypercritical accretion, linking neutrino signals to magnetic field evolution.

Findings

Neutrino production and oscillations are linked to magnetic field submergence.

Detection of neutrino flavor ratios can indicate magnetic field evolution.

The model explains atypical magnetic behavior in RX J0822-4300.

Abstract

Recent X-ray observations in the central compact remnant of Puppis A and other young pulsars have provided convincing evidence about the anti-magnetar nature of the so-called central compact objects (CCOs). The measured period derivative, corrected by the proper movement, provides exceptionally low superficial magnetic fields for such sources. Using the dipole radiation canonical model, the superficial magnetic field of the CCO (RX J0822-4300) in Puppis A was estimated to be $B\simeq 2.9 \times 10^{10}$ G. In this paper, we present a numerical model to interpret the unusual magnetic-field behavior in RX J0822-4300. Using the magnetohydrodynamic simulations during the hypercritical accretion phase, we propose that a variety of MeV neutrinos is created given evidence about the submergence of the magnetic field in the pulsar. We investigate the production, propagation, oscillations, and detection of MeV neutrinos from this source. The detection of neutrino events with their flavor ratios would be a compelling signature of the decreasing evolution of the magnetic field not only in RX J0822-4300 but also in CCO candidates.