We present a detailed study of Australia Telescope Compact Array ( ATCA ) observations ( \lambda = 20 , 13 , 6 & 3 cm ) of supernova remnant ( SNR ) J0509–6731 in the Large Magellanic Cloud ( LMC ) .
The remnant has a ring morphology with brightened regions towards the south-western limb .
We also find a second brightened inner ring which is only seen in the radio-continuum .
The SNR is almost circular , with a diameter ranging from 7 to 8 pc , and a steep radio spectral index between 36 and 3 cm of \alpha = -0.73 \pm 0.02 , which is characteristic of younger SNRs .
We also report detection of radially orientated polarisation across the remnant at 6 cm , with a mean fractional polarisation level of P \cong ( 26 \pm 13 ) % .
We find the magnetic field ( \sim 168 \mu G ) and \Sigma - D ( \Sigma = 1.1 \times 10 ^ { -19 } W m ^ { -2 } Hz ^ { -1 } sr ^ { -1 } , D = 7.35 pc ) to be consistent with other young remnants .