EDP Sciences
Free access
Volume 445, Number 3, January III 2006
Page(s) 1053 - 1060
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20053276

A&A 445, 1053-1060 (2006)
DOI: 10.1051/0004-6361:20053276

Gravitational wave bursts induced by r-mode spin-down of hybrid stars

A. Drago1, G. Pagliara1 and Z. Berezhiani2

1  Dipartimento di Fisica, Università di Ferrara and INFN, Sezione di Ferrara, 44100 Ferrara, Italy
    e-mail: drago@fe.infn.it
2  Dipartimento di Fisica, Università di L'Aquila and INFN, Laboratori Nazionali del Gran Sasso, 67010 L'Aquila, Italy

(Received 20 April 2005 / Accepted 23 August 2005)

We show that sudden variations in the composition and structure of a hybrid star can be triggered by its rapid spin-down, induced by r-mode instabilities. The discontinuity of this process is due to the surface tension between hadronic and quark matter and in particular to the overpressure needed to nucleate new structures of quark matter in the mixed phase. The consequent mini-collapses in the star can produce highly energetic gravitational wave bursts. The possible connection between the predictions of this model and the burst signal found by EXPLORER and NAUTILUS detectors during 2001 is also investigated.

Key words: gravitational waves -- equation of state -- stars: neutron -- stars: evolution -- stars: rotation -- stars: interiors

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