A compact star rotating at 1122 Hz and the r-mode instability

Details A compact star rotating at 1122 Hz and the r-mode instability A compact star rotating at 1122 Hz and the r-mode instability

2007-04-12

arxiv.org/abs/0704.1510v3

Astrophys.J.678:L117-L120,2008

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures, I table. Revised version contains a much more extended discussion of the astrophysical scenario

Scientific paper

10.1086/588635

We show that r-mode instabilities severely constraint the composition of a compact star rotating at a submillisecond period. In particular, the only viable astrophysical scenario for such an object, present inside the Low Mass X-ray Binary associated with the x-ray transient XTE J1739-285, is that it has a strangeness content. Since previous analysis indicate that hyperonic stars or stars containing a kaon condensate are not good candidates, the only remaining possibility is that such an object is either a strange quark star or a hybrid quark-hadron star. We also discuss under which conditions sub-millisecond pulsars are rare.

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