A deceleration search for magnetar pulsations in the X-ray plateaus of Short GRBs

Abstract

A newly formed magnetar has been proposed as the central engine of short GRBs to explain on-going energy injection giving observed plateau phases in the X-ray lightcurves. These rapidly spinning magnetars may be capable of emitting pulsed emission comparable to known pulsars and magnetars. In this paper we show that, if present, a periodic signal would be detectable during the plateau phases observed using the Swift X-Ray Telescope recording data in Window Timing mode. We conduct a targeted deceleration search for a periodic signal from a newly formed magnetar in 2 Swift short GRBs and rule out any periodic signals in the frequency band 10-285 Hz to $\approx$15-30% rms. These results demonstrate that we would able to detect pulsations from the magnetar central engine of short GRBs if they contribute to 15-30% of the total emission. We consider these constraints in the context of the potential emission mechanisms. The non-detection is consistent with the emission being reprocessed in the surrounding environment or with the rotation axis being highly aligned with the observing angle. As the emission may be reprocessed, the expected periodic emission may only constitute a few percent of the total emission and be undetectable in our observations. Applying this strategy to future observations of the plateau phases with more sensitive X-ray telescopes may lead to the detection of the periodic signal.

arXiv comment9 pages, submitted to MNRAS

References in corpus (65)

• The Swift X-ray Telescope
• Gamma-Ray Bursts as the Death Throes of Massive Binary Stars
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• Evidence for a Canonical GRB Afterglow Light Curve in the Swift/XRT Data
• The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
• Hyper-Accreting Black Holes and Gamma-Ray Bursts
• Supernovae, Jets, and Collapsars
• Gamma-ray Burst Afterglow with Continuous Energy Injection: Signature of a Highly-Magnetized Millisecond Pulsar
• The Proto-Magnetar Model for Gamma-Ray Bursts
• Signatures of magnetar central engines in short GRB lightcurves
• The missing link: Merging neutron stars naturally produce jet-like structures and can power short Gamma-Ray Bursts
• Fourier Techniques for Very Long Astrophysical Time Series Analysis
• The early X-ray emission from GRBs
• Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
• Gravitational Waves from Neutron Stars with Large Toroidal B-fields
• X-Ray Flares from Postmerger Millisecond Pulsars
• Gamma-Ray Bursts and Afterglows from Rotating Strange Stars and Neutron Stars
• Swift observations of GRB 070110: an extraordinary X-ray afterglow powered by the central engine
• Short GRBs with Extended Emission from Magnetar Birth: Jet Formation and Collimation
• Discovery of Two High-Magnetic-Field Radio Pulsars
• Relativistic outflows from remnants of compact object mergers and their viability for short gamma-ray bursts
• The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar?
• Short vs Long and Collapsars vs. non-Collapsar: a quantitative classification of GRBs
• The multi-messenger picture of compact object encounters: binary mergers versus dynamical collisions
• Cooling Time Scales and Temporal Structure of Gamma-Ray Bursts
• Accurate evolutions of inspiralling and magnetized neutron-stars: equal-mass binaries
• The Spin Periods and Rotational Profiles of Neutron Stars at Birth
• The termination shock in a striped pulsar wind
• GRB Afterglows with Energy Injection from a spinning down NS
• Can X-ray emission powered by a spinning-down magnetar explain some GRB light curve features?
• Early evolution of newly born magnetars with a strong toroidal field
• GRB afterglow plateaus and Gravitational Waves: multi-messenger signature of a millisecond magnetar?
• A Short GRB "No-Host'' Problem? Investigating Large Progenitor Offsets for Short GRBs with Optical Afterglows
• Swift and Fermi observations of the early afterglow of the short Gamma-Ray Burst 090510
• Magnetar powered GRBs: Explaining the extended emission and X-ray plateau of short GRB light curves
• Relativistic MHD Winds from Rotating Neutron Stars
• Constraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlation
• Can magnetar spin-down power extended emission in some short GRBs?
• Synchronous X-ray and Radio Mode Switches: a Rapid Global Transformation of the Pulsar Magnetosphere
• Observationally constraining gravitational wave emission from short gamma-ray burst remnants
• A Comprehensive Analysis of Fermi Gamma-ray Burst Data: III. Energy-Dependent T90 Distributions of GBM GRBs and Instrumental Selection Effect on Duration Classification
• Optical and near-infrared follow-up observations of four Fermi/LAT GRBs : Redshifts, afterglows, energetics and host galaxies
• The Influence of Thermal Pressure on Equilibrium Models of Hypermassive Neutron Star Merger Remnants
• New Phase-coherent Measurements of Pulsar Braking Indices
• Gravitational waves from massive magnetars formed in binary neutron star mergers
• The braking index of millisecond magnetars
• Jet Precession Driven by Neutrino-Cooled Disc for Gamma-Ray Bursts
• Relativistic Precessing Jets and Cosmological Gamma Ray Bursts
• Fallback Accretion onto a Newborn Magnetar: short GRBs with Extended Emission
• Pulsations in Short GRBs from Black Hole-Neutron Star Mergers
• A new analysis of the short-duration, hard-spectrum GRB 051103, a possible extragalactic SGR giant flare
• The X-ray light curve of Gamma-ray bursts: clues to the central engine
• Self-similar relativistic blast waves with energy injection
• X-ray Observations of a New Unusual Magnetar Swift J1834.9-0846
• Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst
• Precession of neutrino-cooled accretion disks in gamma-ray burst engines
• Can precessing jets explain the light curves of Gamma-ray Bursts?
• Modeling the Surface X-ray Emission and Viewing Geometry of PSR J0821-4300 in Puppis A
• NuSTAR Observations of the Magnetar 1E 2259+586
• Average power density spectrum of Swift long gamma-ray bursts in the observer and in the source rest frames
• A search for pulsations in short gamma-ray bursts to constrain their progenitors
• Gravitational radiation from magnetically funnelled supernova fallback onto a magnetar
• XMM-Newton and Swift observations prove GRB 090709A to be a distant, standard, long GRB
• X-Ray Afterglow Plateaus of Long Gamma-Ray Bursts: Further Evidence for Millisecond Magnetars
• A search for pulsations from the compact object of GRB 060218

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• The X-shooter GRB afterglow legacy sample (XS-GRB)
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• The three-parameter correlations about optical plateaus of gamma-ray bursts
• Constraining coherent low frequency radio flares from compact binary mergers
• Multi-messenger-Athena Synergy White Paper
• Precessing magnetars as central engines in short gamma-ray bursts
• LOFAR early-time search for coherent radio emission from Short GRB 181123B
• LOFAR early-time search for coherent radio emission from GRB 180706A
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