Magnetar oscillations pose challenges for strange stars

Details Magnetar oscillations pose challenges for strange stars Magnetar oscillations pose challenges for strange stars

2006-09-13

arxiv.org/abs/astro-ph/0609364v2

Mon.Not.Roy.Astron.Soc.379:L63,2007

Astronomy and Astrophysics

Astrophysics

Parameter space expanded, 5 pages, 3 figures, MNRAS Letters in press

Scientific paper

10.1111/j.1745-3933.2007.00336.x

Compact relativistic stars allow us to study the nature of matter under extreme conditions, probing regions of parameter space that are otherwise inaccessible. Nuclear theory in this regime is not well constrained: one key issue is whether neutron stars are in fact composed primarily of strange quark matter. Distinguishing the two possibilities, however, has been difficult. The recent detection of seismic vibrations in the aftermath of giant flares from two magnetars (highly magnetized compact stars) is a major breakthrough. The oscillations excited seem likely to involve the stellar crust, the properties of which differ dramatically for strange stars. We show that the resulting mode frequencies cannot be reconciled with the observations for reasonable magnetar parameters. Ruling out strange star models would place a strong constraint on models of dense quark matter.

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