2011/11/02 by Anna L. Watts, Watts, Anna L. · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Geological and Geophysical Studies #Geophysics and Gravity Measurements #High Energy Astrophysical Phenomena (astro-ph.HE) #Nuclear Theory (nucl-th) #Pulsars and Gravitational Waves Research #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.HE #astro-ph.SR #nucl-th
paper · pdf · doi:10.48550/arxiv.1111.0514
16 pages, 2 figures; to appear as a chapter in the book "Neutron Star Crust", edited by C. A. Bertulani and J. Piekarewicz
arxiv created 2011/11/02 · openalex publication_date 2011/11/02 · arxiv updated 2011/11/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The most strongly magnetized neutron stars, the magnetars, have spectacular outbursts of gamma-ray flares powered by decay of the magnetic field. The rapidly changing field is strong enough that it should be able to stress and rupture the star's crust, with potentially interesting seismic consequences. This was confirmed in dramatic fashion a few years ago with the discovery of long-lived seismic vibrations excited by rare giant flares. The starquakes associated with the giant flares are, it seems, so catastrophic that they leave the whole star ringing. These discoveries have opened up the possibility of using asteroseismology to study the extreme conditions of the neutron star interior - the dense matter equation of state in crust and core, and the core magnetic field. This chapter reviews the main observational properties of the oscillations seen in the giant flares, and the state of the art in terms of theoretical models of global seismic vibrations in magnetars. I discuss efforts to extend oscillation searches to smaller magnetar bursts (which are more frequent but less energetic), and the role that crust rupturing might play in triggering magnetar flares and exciting global seismic oscillations.