期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 796, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/796/1/L3
关键词
dense matter; equation of state; stars: neutron; X-rays: binaries
资金
- NSERC via the Vanier CGS program
- NSERC Discovery grant program
Neutrons stars are unique laboratories for discriminating between the various proposed equations of state of matter at and above nuclear density. One sub-class of neutron stars-those inside quiescent low-mass X-ray binaries (qLMXBs)-produce a thermal surface emission from which the neutron star radius (R-NS) can be measured, using the widely accepted observational scenario for qLMXBs, assuming unmagnetized H atmospheres. In a combined spectral analysis, this work first reproduces a previously published measurement of the R-NS, assumed to be the same for all neutron stars, using a slightly expanded data set. The radius measured is R-NS = 9.4 +/- 1.2 km. On the basis of spectral analysis alone, this measured value is not affected by imposing an assumption of causality in the core. However, the assumptions underlying this RNS measurement would be falsified by the observation of any neutron star with a mass >2.6 M-circle dot, since radii <11 km would be rejected if causality is assumed, which would exclude most of the R-NS parameter space obtained in this analysis. Finally, this work directly tests a selection of dense matter equations of state: WFF1, AP4, MPA1, PAL1, MS0, and three versions of equations of state produced through chiral effective theory. Two of those, MS0 and PAL1, are rejected at the 99% confidence level, accounting for all quantifiable uncertainties, while the other cannot be excluded at >99% certainty.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据