# Does PSR J1417-4402 system behave as a "Redback"?

## TL;DR

This paper investigates whether the PSR J1417-4402 system exhibits redback-like behavior by analyzing its evolutionary status, orbital characteristics, and the effects of irradiation and evaporation, revealing it shares many features with redbacks but on a wider orbit.

## Contribution

The study demonstrates that binary evolution models including irradiation feedback and pulsar-driven evaporation can explain the properties of PSR J1417-4402, extending redback formation physics to wider orbits.

## Key findings

- The system has characteristics similar to redbacks but with a wider orbit.
- Evolutionary tracks can reproduce observed masses and photometry.
- The same physics explains both redback and wider orbit systems.

## Abstract

We study the present evolutionary status of the binary system containing the 2.66 ms pulsar PSR J1417-4402 in a 5.4 day orbit. This is the pulsar in the original source 3FGL J1417.5-4402, that has undergone a transition from X-ray state to a pulsar state, just like some redbacks did. The system has many characteristics similar to redback pulsars family, but is on a much wider orbit. We show that close binary evolution including irradiation feedback driven by the luminosity due to accretion onto the neutron star component of the pair, and evaporation due to pulsar emission, is able to account for the masses of the components and the photometric data of the donor star. The tracks leading to the present PSR J1417-4402 are degenerate within a range of parameters, suggesting that the {\it same} physics invoked to explain the redback/black widows groups leads to the formation of much wider orbit systems, outside the redback region limits.