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Comparative properties of X-Ray Flashes and Gamma-Ray Bursts from BeppoSAX observations of Fast X-ray Transients
L. Piro, G. Gianfagna, J. J. M. in't Zand +5
We present the homogeneous and complete sample of 96 bona-fide Gamma Ray Bursts (GRBs) detected by the Wide Field Cameras and Gamma Ray Burst Monitor of BeppoSAX. We derive the spe…
A strongly truncated inner accretion disk in the Rapid Burster
J. van den Eijnden, T. Bagnoli, N. Degenaar +4
The neutron star (NS) low-mass X-ray binary (LMXB) the Rapid Burster (RB; MXB 1730-335) uniquely shows both Type-I and Type-II X-ray bursts. The origin of the latter is ill-underst…
X-ray Reflection and An Exceptionally Long Thermonuclear Helium Burst from IGR J17062-6143
L. Keek, W. Iwakiri, M. Serino +3
Thermonuclear X-ray bursts from accreting neutron stars power brief but strong irradiation of their surroundings, providing a unique way to study accretion physics. We analyze MAXI…
A Soft X-Ray Spectral Episode for the Clocked Burster, GS 1826-24 as Measured by Swift and NuSTAR
J. Chenevez, D. K. Galloway, J. J. M. in 't Zand +12
We report on NuSTAR and Swift observations of a soft state of the neutron star low-mass X-ray binary GS 1826-24, commonly known as the "clocked" burster. The transition to the soft…
Probing the emission physics and weak/soft population of Gamma-Ray Bursts with LOFT
L. Amati, G. Stratta, J. -L. Atteia +36
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT f…
Relativistic outflow from two thermonuclear shell flashes on neutron stars
Jean in 't Zand, Laurens Keek, Yuri Cavecchi
We study the exceptionally short (32-41 ms) precursors of two intermediate-duration thermonuclear X-ray bursts observed with RXTE from the neutron stars in 4U 0614+09 and 2S 0918-5…
The cooling rate of neutron stars after thermonuclear shell flashes
J. J. M. in 't Zand, A. Cumming, T. L. Triemstra +2
Thermonuclear shell flashes on neutron stars are detected as bright X-ray bursts. Traditionally, their decay is modeled with an exponential function. However, this is not what theo…
Double-peaked thermonuclear bursts at the soft-hard state transition in the Rapid Burster
T. Bagnoli, J. J. M. in 't Zand, A. Patruno +1
Long suspected to be due to unstable accretion events, the type II bursts exhibited by the Rapid Burster (RB, or MXB 1730-335) still lack an exhaustive explanation. Apart from type…
The Hot and Energetic Universe: End points of stellar evolution
Christian Motch, Jörn Wilms, Didier Barret +22
White dwarfs, neutron stars and stellar mass black holes are key laboratories to study matter in most extreme conditions of gravity and magnetic field. The unprecedented effective…
Superexpansion as a possible probe of accretion in 4U 1820-30
J. J. M. in 't Zand, J. Homan, L. Keek +1
The ultracompact X-ray binary 4U 1820-30 is well known for its ~170-d superorbital modulation in X-ray flux and spectrum, and the exclusiveness of bursting behavior to the low hard…
A four-year XMM-Newton/Chandra monitoring campaign of the Galactic Centre: analysing the X-ray transients
N. Degenaar, R. Wijnands, E. M. Cackett +5
We report on the results of a four-year long X-ray monitoring campaign of the central 1.2 square degrees of our Galaxy, performed with Chandra and XMM-Newton between 2005 and 2008.…
Superburst Models for Neutron Stars with Hydrogen and Helium-Rich Atmospheres
L. Keek, A. Heger, J. J. M. in 't Zand
Superbursts are rare day-long Type I X-ray bursts due to carbon flashes on accreting neutron stars in low-mass X-ray binaries. They heat the neutron star envelope such that the bur…
Achromatic late-time variability in thermonuclear X-ray bursts - an accretion disk disrupted by a nova-like shell?
J. J. M. in 't Zand, D. K. Galloway, D. R. Ballantyne
An unusual Eddington-limited thermonuclear X-ray burst was detected from the accreting neutron star in 2S 0918-549 with the Rossi X-ray Timing Explorer. The burst commenced with a…
Puzzling thermonuclear burst behaviour from the transient low-mass X-ray binary IGR J17473-2721
J. Chenevez, D. Altamirano, D. K. Galloway +8
We investigate the thermonuclear bursting behaviour of IGR J17473-2721, an X-ray transient that in 2008 underwent a six month long outburst, starting (unusually) with an X-ray burs…
Evidence of heavy-element ashes in thermonuclear X-ray bursts with photospheric superexpansion
J. J. M. in 't Zand, N. N. Weinberg
A small subset of thermonuclear X-ray bursts on neutron stars exhibit such a strong photospheric expansion that for a few seconds the photosphere is located at a radius r_ph >~ 100…
What ignites on the neutron star of 4U 0614+091?
E. Kuulkers, J. J. M. in 't Zand, J. -L. Atteia +10
[abridged] The LMXB 4U 0614+091 is a source of sporadic thermonuclear (type I) X-ray bursts. We find bursts with a wide variety of characteristics in serendipitous wide-field X-ray…
The effect of rotation on the stability of nuclear burning in accreting neutron stars
L. Keek, N. Langer, J. J. M. in 't Zand
Hydrogen and/or helium accreted by a neutron star from a binary companion may undergo thermonuclear fusion. At different mass accretion rates different burning regimes are discerne…
Monitoring campaign of 1RXS J171824.2-402934, the low-mass X-ray binary with the lowest mass accretion rate
J. J. M. in 't Zand, P. G. Jonker, C. G. Bassa +2
An X-ray monitoring campaign with Chandra and Swift confirms that 1RXS J171824.2-402934 is accreting at the lowest rate among the known persistently accreting low-mass X-ray binari…