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Type I X-ray bursts are thermonuclear explosions on the neutron star (NS) surface caused by mass accretion from a companion star. Observations of X-ray bursts provide valuable information on X-ray binary systems, e.g., binary parameters,…

High Energy Astrophysical Phenomena · Physics 2022-01-06 A. Dohi , N. Nishimura , M. Hashimoto , Y. Matsuo , T. Noda , S. Nagataki

Type-I X-ray burst light curves encode unique information about the structure of accreting neutron stars and the nuclear reaction rates of the rp-process that powers bursts. Using the first model calculations of hydrogen/helium burning…

High Energy Astrophysical Phenomena · Physics 2018-06-25 Zach Meisel

Neutron star (NS) masses and radii can be estimated from observations of photospheric radius-expansion X-ray bursts, provided the chemical composition of the photosphere, the spectral colour-correction factors in the observed luminosity…

In this study, we calculate for the first time the impacts of neutron star(NS) structure on the type I X-ray burst ashes using the \texttt{MESA} code. We find an increased mass fraction of the heavier elements with increasing surface…

High Energy Astrophysical Phenomena · Physics 2025-02-18 Guoqing Zhen , Helei Liu , Akira Dohi , Guoliang Lü , Nobuya Nishimura , Chunhua Zhu , Renxin Xu

One long standing tension between theory and observations of Type I X-ray burst is the accretion rate at which the burst disappear due to stabilization of the nuclear burning that powers them. This is observed to happen at roughly one third…

High Energy Astrophysical Phenomena · Physics 2024-11-18 Martin Nava-Callejas , Yuri Cavecchi , Dany Page

Low-mass X-ray binaries hosting neutron stars (NS) exhibit thermonuclear (type-I) X-ray bursts, which are powered by unstable nuclear burning of helium and/or hydrogen into heavier elements deep in the NS "ocean". In some cases the burning…

High Energy Astrophysical Phenomena · Physics 2015-09-09 Joonas Nättilä , Valery Suleimanov , Jari J. E. Kajava , Juri Poutanen

In low-mass X-ray binaries, the accretion of stellar material onto a neutron star can fuel unstable thermonuclear flashes known as Type I X-ray bursts. Simulating these events using computational models can provide valuable information…

High Energy Astrophysical Phenomena · Physics 2020-04-02 Zac Johnston

During accretion, a neutron star (NS) is spun up as angular momentum is transported through its liquid surface layers. We study the resulting differentially rotating profile, focusing on the impact this has for type I X-ray bursts. The…

Astrophysics · Physics 2008-11-26 Anthony L. Piro , Lars Bildsten

I review our understanding of the thermonuclear instabilities on accreting neutron stars that produce Type I X-Ray bursts. I emphasize those observational and theoretical aspects that should interest the broad audience of this meeting. The…

Astrophysics · Physics 2009-10-31 Lars Bildsten

Type-I X-ray bursts are rapid-brightening transient phenomena on the surfaces of accreting neutron stars (NSs). Some X-ray bursts, called {\it clocked bursters}, exhibit regular behavior with similar light curve profiles in their burst…

High Energy Astrophysical Phenomena · Physics 2023-11-07 Akira Dohi , Wataru Iwakiri , Nobuya Nishimura , Tsuneo Noda , Shigehiro Nagataki , Masa-aki Hashimoto

The excess of the rate of type I X-ray bursts over that expected when the matter fallen between bursts completely burns out in a thermonuclear explosion is explained in terms of the model of a spreading layer of matter coming from the…

High Energy Astrophysical Phenomena · Physics 2018-12-03 S. A. Grebenev , I. V. Chelovekov

We investigate the impacts of neutrino cooling mechanism inside the neutron star (NS) core on the light curves of type-I X-ray bursts and X-ray superbursts. From several observations of NS thermal evolution, physical processes of fast…

High Energy Astrophysical Phenomena · Physics 2023-03-21 Akira Dohi , Nobuya Nishimura , Hajime Sotani , Tsuneo Noda , Helei Liu , Shigehiro Nagataki , Masa-aki Hashimoto

Type I X-ray bursts are thermonuclear flashes observed from the surfaces of accreting neutron stars (NSs) in Low Mass X-ray Binaries. Oscillations have been observed during the rise and/or decay of some of these X-ray bursts. Those seen…

High Energy Astrophysical Phenomena · Physics 2016-02-17 Simin Mahmoodifar , Tod Strohmayer

Plasma accreted onto the surface of a neutron star can ignite due to unstable thermonuclear burning and produce a bright flash of X-ray emission called a Type-I X-ray burst. Such events are very common; thousands have been observed to date…

High Energy Astrophysical Phenomena · Physics 2017-12-27 N. Degenaar , D. R. Ballantyne , T. Belloni , M. Chakraborty , Y. -P. Chen , L. Ji , P. Kretschmar , E. Kuulkers , J. Li , T. J. Maccarone , J. Malzac , S. Zhang , S. -N. Zhang

Accreting neutron stars (NSs) often show coherent modulations during type I X-ray bursts, called burst oscillations. We consider whether a nonradial mode can serve as an explanation for burst oscillations from those NSs which are not…

Astrophysics · Physics 2009-11-10 Anthony L. Piro , Lars Bildsten

Type-I X-ray bursts can be used to determine properties of accreting neutron stars via comparisons between model calculations and astronomical observations, exploiting the sensitivity of models to astrophysical conditions. However, the…

High Energy Astrophysical Phenomena · Physics 2019-02-19 Zach Meisel , Grant Merz , Sophia Medvid

Nuclear burning and its dependence on the mass accretion rate are fundamental ingredients for describing the complicated observational phenomenology of neutron stars in binary systems. Motivated by high quality burst rate data emerging from…

High Energy Astrophysical Phenomena · Physics 2017-12-20 Yuri Cavecchi , Anna L. Watts , Duncan K. Galloway

Observations of Type I X-ray bursts have long been taken as evidence that the sources are neutron stars. Black body models approximate the spectral data and imply a suddenly heated neutron star cooling over characteristic times of seconds…

Astrophysics · Physics 2009-10-31 Jean H. Swank

We investigate X-ray bursts during the thermal evolution of an accreting neutron star which corresponds to the X-ray burster GS\ 1826-24. Physical quantities of the neutron star are included using an equation of state below and above the…

Solar and Stellar Astrophysics · Physics 2020-01-24 Akira Dohi , Masa-aki Hashimoto , Rio Yamada , Yasuhide Matsuo , Masayuki Fujimoto

Neutron stars in mass-transferring binaries are accreting the hydrogen and helium rich matter from the surfaces of their companions. This article simply explains the physics associated with how that material eventually fuses to form heavier…

Astrophysics · Physics 2007-05-23 Lars Bildsten
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