# Relativistic Disk Reflection in the Neutron Star X-ray Binary XTE J1709-267 with NuSTAR

## TL;DR

This study analyzes relativistic disk reflection in the neutron star X-ray binary XTE J1709-267 using NuSTAR data, revealing disk truncation likely due to boundary layer or magnetosphere effects, with implications for magnetic field strength.

## Contribution

First reflection analysis of XTE J1709-267 during outburst, providing insights into disk truncation and magnetic field constraints around the neutron star.

## Key findings

- Inner disk radius varies between 13.8 and 23.4 Rg during different flux states.
- Disk likely truncated by boundary layer or magnetosphere.
- Upper limit on magnetic field strength is 0.75-3.70×10^9 G.

## Abstract

We perform the first reflection study of the soft X-ray transient and Type 1 burst source XTE J1709-267 using NuSTAR observations during its 2016 June outburst. There was an increase in flux near the end of the observations, which corresponds to an increase from $\sim$0.04 L$_{\mathrm{Edd}}$ to $\sim$0.06 L$_{\mathrm{Edd}}$ assuming a distance of 8.5 kpc. We have separately examined spectra from the low and high flux intervals, which were soft and show evidence of a broad Fe K line. Fits to these intervals with relativistic disk reflection models have revealed an inner disk radius of $13.8_{-1.8}^{+3.0}\ R_{g}$ (where $R_{g} = GM/c^{2}$) for the low flux spectrum and $23.4_{-5.4}^{+15.6}\ R_{g}$ for the high flux spectrum at the 90\% confidence level. The disk is likely truncated by a boundary layer surrounding the neutron star or the magnetosphere. Based on the measured luminosity and using the accretion efficiency for a disk around a neutron star, we estimate that the theoretically expected size for the boundary layer would be $\sim0.9-1.1 \ R_{g}$ from the neutron star's surface, which can be increased by spin or viscosity effects. Another plausible scenario is that the disk could be truncated by the magnetosphere. We place a conservative upper limit on the strength of the magnetic field at the poles, assuming $a_{*}=0$ and $M_{NS}=1.4\ M_{\odot}$, of $B\leq0.75-3.70\times10^{9}$ G, though X-ray pulsations have not been detected from this source.