Gravitational Waves from Newborn Accreting Millisecond Magnetars

Abstract

Two accretion columns have been argued to form over the surface of a newborn millisecond magnetar for an extremely high accretion rate $\gtrsim 1.8\times 10^{-2}{M}_{\odot }{\mathrm{s}}^{-1}$ that may occur in the core-collapse of a massive star. In this paper, we investigate the characteristics of these accretion columns and their gravitational wave (GW) radiation. For a typical millisecond magnetar (surface magnetic field strength $B\sim 10^{15}$ G and initial spin period $P\sim 1$ ms), we find (1) its accretion columns are cooled via neutrinos and can reach a height $\sim 1$ km over the stellar surface; (2) its column-induced characteristic GW strain is comparable to the sensitivities of the next generation ground-based GW detectors within a horizon $\sim 1$ Mpc; (3) the magnetar can survive only a few tens of seconds; (4) during the survival timescale, the height of the accretion columns increases rapidly to the peak and subsequently decreases slowly; (5) the column mass, characteristic GW strain, and maximum GW luminosity have simultaneous peaks in a similar rise-fall evolution. In addition, we find that the magnetar's spin evolution is dominated by the column accretion torque. A possible association with failed supernova is also discussed.

8 pages, 3 figures, accepted for publication in PRD

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Cited by in corpus (5)

• Magnetars from Neutron Star--White Dwarf Mergers: Application to Fast Radio Bursts
• Gravitational waves from mountains in newly born millisecond magnetars
• Constraining the ellipticity of new-born magnetar with the observational data of Long gamma-ray bursts
• Gravitational-wave evolution of newborn magnetars with different deformed structure
• Exploring the magnetic field of the ultraluminous X-ray pulsar NGC 4631 X-8