Long-term evolution of RRAT J1819-1458

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Official URL: http://dx.doi.org/10.1093/mnras/sty2287

At present, J1819-1458 is the only rotating radio transient (RRAT) detected in X-rays. We have studied the long-term evolution of this source in the fallback disc model. The model can reproduce the period, period derivative, and X-ray luminosity of J1819-1458 simultaneously in the accretion phase at ages similar to 2 x 10(5) yr. We obtained reasonable model curves with a magnetic dipole field strength B-0 similar to 5 x 10(11) G on the pole of the neutron star, which is much weaker than the field inferred from the dipole-torque formula. With this B-0 and the measured period, we find J1819-1458 below and close to the radio pulsar death line. Our results are not sensitive to initial period, and the source properties can be produced with a large range of disc masses. Our simulations indicate that J1819-1458 is evolving towards the properties of dim isolated neutron stars at later phases of evolution. This implies a close evolutionary link between RRATs and dim isolated neutron stars. For other RRATs with measured period derivatives and unknown X-ray luminosities, we have estimated the lower limits on the B-0 values in the fallback disc model. These limits allow a dipole field distribution for RRATs that could fill the B-0 gap between the estimated B-0 ranges of dim thermal isolated neutron stars and central compact objects in the same model.