A Central Compact Object in Kes 79: The hypercritical regime and neutrino expectation

Abstract

We present magnetohydrodynamical simulations of a strong accretion onto magnetized proto-neutron stars for the Kesteven 79 (Kes 79) scenario. The supernova remnant Kes 79, observed with the Chandra ACIS-I instrument during approximately 8.3 h, is located in the constellation Aquila at a distance of 7.1 kpc in the galactic plane. It is a galactic and a very young object with an estimate age of 6 kyr. The Chandra image has revealed, for the first time, a point-like source at the center of the remnant. The Kes 79 compact remnant belongs to a special class of objects, the so-called Central Compact Objects, which exhibits no evidence for a surrounding pulsar wind nebula. In this work we show that the submergence of the magnetic field during the hypercritical phase can explain such behavior for Kes 79 and others CCOs. The simulations of such regime were carried out with the adaptive-mesh-refinement code FLASH in two spatial dimensions, including radiative loss by neutrinos and an adequate equation of state for such regime. From the simulations, we estimate that the number of thermal neutrinos expected on the Hyper-Kamiokande Experiment is 733$\pm$364. In addition, we compute the flavor ratio on Earth for a progenitor model.

arXiv comment16 pages and 6 figures. Accepted for publication in MNRAS. New references were added

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• Could an hypercritical accretion be associated with the atypical magnetic-field behavior in RX J0822-4300?
• A post-hypercritical accretion small-scale dynamo in newborn neutron stars