SAX J1808.4-3657 in Quiescence: A Keystone for Neutron Star Science
C. O. Heinke, C. J. Deloye, P. G. Jonker, R. E. Taam, R. Wijnands
TL;DR
This study uses X-ray and optical observations of SAX J1808.4-3657 in quiescence to explore neutron star cooling mechanisms and the heating of its companion, advancing understanding of neutron star evolution and pulsar states.
Contribution
It provides new constraints on neutron star surface thermal radiation and investigates the heating mechanisms of the companion star during quiescence.
Findings
Evidence for neutrino cooling processes in the neutron star core.
Insights into whether X-ray irradiation or pulsar activation heats the companion.
Constraints on the thermal emission from the neutron star surface.
Abstract
The accreting millisecond pulsar SAX J1808.4-3658 may be a transition object between accreting X-ray binaries and millisecond radio pulsars. We have constrained the thermal radiation from its surface through XMM-Newton X-ray observations, providing strong evidence for neutrino cooling processes from the neutron star core. We have also undertaken simultaneous X-ray and optical (Gemini) observations, shedding light on whether the strong heating of the companion star in quiescence may be due to X-ray irradiation, or to a radio pulsar turning on when accretion stops.
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