Is PSR B0943+10 a low-mass quark star?

Abstract

A recent X-ray observation has shown that the radio pulsar PSR B0943+10, with clear drifting subpulses, has a much smaller polar cap area than that of conventional pulsars with mass of $\sim\msun$ and radius of $\sim 10$ km. Zhang et al. (2005) addressed then that this new result conflicts with the standard vacuum gap model. Nonetheless, the discrepancy could be explained if PSR B0943+10 is actually a low-mass quark star. It is found that the potential drop in the open-field-line region of oblique pulsars (i.e., inclination angle $\alpha \ne 0$) might be $\sim 10^2$ times that of aligned pulsars, and that PSR B0943+10 with $\alpha =12.4^{\mathrm{o}}$ could be well above the deathline. We thus conclude that the Ruderman-Sutherland-type vacuum gap model still works well for this pulsar if it is a bare quark star with a mass of $\sim 0.02M_{\odot }$ and a radius of $\sim 2.6$ km.

10 pages, 2 figures, accepted for publication in ApJ Letters

References in corpus (5)

• Time-dependent force-free pulsar magnetospheres: axisymmetric and oblique rotators
• Revised Pulsar Spindown
• A Braking Index for the Young, High-Magnetic-Field, Rotation-Powered Pulsar in Kes 75
• 1E 1207.4-5209: a low-mass bare strange star?
• XMM-Newton observation of the drifting pulsar B0943+10

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