X-ray bounds on the r-mode amplitude in millisecond pulsars

Abstract

r-mode astroseismology provides a unique way to study the internal composition of compact stars. Due to their precise timing, recycled millisecond radio pulsars present a particularly promising class of sources. Although their thermal properties are still poorly constrained, X-ray data is very useful for astroseismology since r-modes could strongly heat a star. Using known and new upper bounds on the temperatures and luminosities of several non-accreting millisecond radio pulsars we derive bounds on the r-mode amplitude as low as $\alpha \lesssim 10^{-8}$ and discuss the impact on scenarios for their internal composition.

arXiv comment10 pages, 8 figures

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