Discovering a 5.72 Day Period in the Supergiant Fast X-ray Transient AX J1845.0-0433

TL;DR

This paper reports the discovery of a 5.72-day orbital period in the supergiant fast X-ray transient AX J1845.0-0433, providing insights into its system geometry and orbital characteristics.

Contribution

The study identifies a precise orbital period in AX J1845.0-0433 and estimates system parameters, advancing understanding of SFXT orbital dynamics.

Findings

Orbital period of 5.7195 days determined.

Upper limit for supergiant size (<27 R_sun) estimated.

Orbit eccentricity constrained (<0.37).

Abstract

Temporal analysis of INTEGRAL/IBIS data has revealed a 5.7195\pm0.0007 day periodicity in the supergiant fast X-ray transient (SFXT) source AX J1845.0-0433, which we interpret as the orbital period of the system. The new-found knowledge of the orbital period is utilised to investigate the geometry of the system by means of estimating an upper limit for the size of the supergiant (<27 R_{\sun}) as well as the eccentricity of the orbit (\epsilon<0.37).