NICER observation list: Target ID 253101

Abstract

In 2013, PSR J1023+0038 transformed from a rotation-powered radio millisecond pulsar state to an accretion-disk-dominated X-ray pulsar state, where it has remained since. In its current accretion-disk state it shows coherent X-ray pulsations, suggestive of active accretion onto the neutron star surface at very low luminosities (~10^33 erg/s). Using these pulsations we have found that in the X-ray state the pulsar is spinning down 25% faster than in the radio state. We propose to extend our timing solution with NICER through an impending state transition in the near future, which would be immensely helpful for understanding how tMSPs undergo sudden state transitions and enable us to constrain accretion models.
Obsid RA DEC l b Start End Exposure Number of
Modules
Number of
Processing
Status of
Processing
Date of
Processing
Public
date
2531010101 155.929 0.635 243.482 45.761 58611.0262 58611.8935 27125.0 52 3 VALIDATED 58615.7 58625
2531010201 155.928 0.635 243.481 45.761 58613.0230 58613.8275 26960.0 52 2 VALIDATED 58616.6 58627
2531010301 155.928 0.635 243.481 45.760 58623.3917 58623.9843 4169.0 52 3 VALIDATED 58627.6 58637
2531010302 155.928 0.635 243.481 45.761 58624.0361 58624.9509 9015.0 52 3 VALIDATED 58631.7 58638
2531010303 155.928 0.636 243.479 45.761 58625.0019 58625.6660 10009.0 52 2 VALIDATED 58631.8 58639
2531010401 155.929 0.637 243.481 45.762 58647.8299 58647.9729 2472.0 52 3 VALIDATED 58653.7 58661
2531010402 155.930 0.636 243.482 45.762 58648.0232 58648.1664 1725.0 52 2 VALIDATED 58653.7 58662
2531010403 155.928 0.636 243.480 45.761 58658.2727 58658.9498 16431.0 52 2 VALIDATED 58662.9 58672
2531010404 155.928 0.636 243.480 45.760 58658.9819 58659.2624 4423.0 52 2 VALIDATED 58664.7 58673