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NICER observation of unusual burst oscillations in 4U 1728-34

NICER observation of unusual burst oscillations in 4U 1728-34
NICER observation of unusual burst oscillations in 4U 1728-34
The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the low-mass X-ray binary neutron star 4U 1728−34 from the start of the mission's operations until 2019 February. Three of these bursts show oscillations in their decaying tail, with frequencies that are within 1 Hz of the previously detected burst oscillations from this source. Two of these burst oscillations have unusual properties: they have large fractional root mean square (rms) amplitudes of 48% ± 9% and 46% ± 9%, and they are detected only at photon energies above 6 keV. By contrast, the third detected burst oscillation is compatible with previous observations of this source, with a fractional rms amplitude of 7.7% ± 1.5% rms in the 0.3 to 6.2 keV energy band. We discuss the implications of these large-amplitude burst oscillations, finding that they are difficult to explain with the current theoretical models for X-ray burst tail oscillations.
0004-637X
Mahmoodifar, Simin
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Strohmayer, Tod E.
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Bult, Peter
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Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
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Gendreau, Keith C.
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Guillot, Sebastien
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Homan, Jeroen
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Jaisawal, Gaurava K.
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Keek, Laurens
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Wolff, Michael T.
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Mahmoodifar, Simin
8c38d862-86dd-428d-a5ff-2cdc7bbfc223
Strohmayer, Tod E.
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Bult, Peter
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Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
322198a5-4c3a-4369-99ee-b66befa6a518
Gendreau, Keith C.
cad26609-b22d-4c1d-ada3-4af51e2cd780
Guillot, Sebastien
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Homan, Jeroen
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Jaisawal, Gaurava K.
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Keek, Laurens
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Wolff, Michael T.
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Mahmoodifar, Simin, Strohmayer, Tod E., Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Chakrabarty, Deepto, Gendreau, Keith C., Guillot, Sebastien, Homan, Jeroen, Jaisawal, Gaurava K., Keek, Laurens and Wolff, Michael T. (2019) NICER observation of unusual burst oscillations in 4U 1728-34. The Astrophysical Journal, 878 (2), [145]. (doi:10.3847/1538-4357/ab20c4).

Record type: Article

Abstract

The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the low-mass X-ray binary neutron star 4U 1728−34 from the start of the mission's operations until 2019 February. Three of these bursts show oscillations in their decaying tail, with frequencies that are within 1 Hz of the previously detected burst oscillations from this source. Two of these burst oscillations have unusual properties: they have large fractional root mean square (rms) amplitudes of 48% ± 9% and 46% ± 9%, and they are detected only at photon energies above 6 keV. By contrast, the third detected burst oscillation is compatible with previous observations of this source, with a fractional rms amplitude of 7.7% ± 1.5% rms in the 0.3 to 6.2 keV energy band. We discuss the implications of these large-amplitude burst oscillations, finding that they are difficult to explain with the current theoretical models for X-ray burst tail oscillations.

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NICER Observation of Unusual Burst Oscillations in 4U 1728-34 - Accepted Manuscript
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Accepted/In Press date: 8 May 2019
Published date: 24 June 2019

Identifiers

Local EPrints ID: 432979
URI: http://eprints.soton.ac.uk/id/eprint/432979
ISSN: 0004-637X
PURE UUID: bb80fc1c-0a62-4817-a944-4fc2d5c5c5cd
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 05 Aug 2019 16:30
Last modified: 26 Nov 2021 03:02

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Contributors

Author: Simin Mahmoodifar
Author: Tod E. Strohmayer
Author: Peter Bult
Author: Zaven Arzoumanian
Author: Deepto Chakrabarty
Author: Keith C. Gendreau
Author: Sebastien Guillot
Author: Jeroen Homan
Author: Gaurava K. Jaisawal
Author: Laurens Keek
Author: Michael T. Wolff

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