We show that r-mode instabilities severely constrain the composition of a compact star rotating with 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 analyses 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 submillisecond pulsars are rare.

A Compact Star Rotating at 1122 Hz and the r-Mode Instability

DRAGO, Alessandro;PAGLIARA, Giuseppe;PARENTI, Irene
2008

Abstract

We show that r-mode instabilities severely constrain the composition of a compact star rotating with 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 analyses 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 submillisecond pulsars are rare.
Drago, Alessandro; Pagliara, Giuseppe; Parenti, Irene
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1509723
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