Constraints on Neutron Star Structure from the Clocked X-Ray Burster 1RXS J180408.9−342058
Year: 2023
Type: article
Abstract: Type I X-ray bursts are rapid-brightening transient phenomena on the surfaces of accreting neutron stars (NSs). Some X-ray bursts, called clocked bursters, exhibit regular behavior with similar light-curve profiles in their burst sequences. The periodic nature of clocked bursters has the advantage of constraining X-ray binary parameters and physics inside the NS. In the present study, we compute numerical models, based on different equations of state and NS masses, which are compared with the observations of a recently identified clocked burster, 1RXS J180408.9−342058. We find that the relation between the accretion rate and the recurrence time is highly sensitive to the NS mass and radius. We determine, in particular, that 1RXS J180408.9−342058 appears to possess a mass less than 1.7M ⊙ and favors a stiffer nuclear equation of state (with an NS radius ≳12.7 km). Consequently, the observations of this new clocked burster may provide additional constraints for probing the structure of NSs.
Source: The Astrophysical Journal
Institutions: RIKEN, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences, Chiba University, International Center for Hadron Astrophysics, Chiba University, RIKEN Nishina Center, Kurume Institute of Technology, Okinawa Institute of Science and Technology Graduate University, Kyushu University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Awards: r-process nucleosynthesis and role of deformed nuclei, Unraveling Nuclear Matter in the Crust From the Neutron-Star Luminosity, A unified understanding of r-process nucleosynthesis from gravitational wave and kilonova observations, Unified Understanding of Explosion and Emission Mechanisms of Gamma-Ray Bursts
OpenAlex ID: W4389982007