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Understanding high-density matter through analysis of surface spectral lines and burst oscillations from accreting neutron stars |
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| Authors: | Sudip Bhattacharyya M Coleman Miller Tod E Strohmayer Frederick K Lamb Craig B Markwardt |
| Institution: | aDepartment of Astronomy, University of Maryland at College Park, College Park, MD 20742, USA bGoddard Space Flight Center, NASA, Code 662, Greenbelt, MD 20771, USA cDepartments of Physics and Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801-3080, USA |
| Abstract: | We discuss millisecond period brightness oscillations and surface atomic spectral lines observed during type I X-ray bursts from a neutron star in a low mass X-ray binary system. We show that modeling of these phenomena can constrain models of the dense cold matter at the cores of neutron stars. We demonstrate that, even for a broad and asymmetric spectral line, the stellar radius-to-mass ratio can be inferred to better than 5%. We also fit our theoretical models to the burst oscillation data of the low mass X-ray binary XTE J1814-338, and find that the 90% confidence lower limit of the neutron star’s dimensionless radius-to-mass ratio is 4.2. |
| Keywords: | Equation of state Line: profiles Relativity Stars: neutron X-rays: binaries X-rays: bursts |
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