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X-Raying an Accretion Disk in Realtime: the Evolution of Ionized Reflection during a Superburst from 4U 1636-536
L. Keek, D. R. Ballantyne, E. Kuulkers +1
When a thermonuclear X-ray burst ignites on an accreting neutron star, the accretion disk undergoes sudden strong X-ray illumination, which can drive a range of processes in the di…
Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay
Emrah Kalemci, Mehtap Ozbey Arabaci, Tolga Guver +12
We characterized the broad-band X-ray spectra of Swift J1745-26 during the decay of the 2013 outburst using INTEGRAL ISGRI, JEM-X and Swift XRT. The X-ray evolution is compared to…
The influence of accretion geometry on the spectral evolution during thermonuclear (type-I) X-ray bursts
Jari J. E. Kajava, Joonas Nättilä, Outi-Marja Latvala +6
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 spect…
The effect of accretion on the measurement of neutron star mass and radius in the low-mass X-ray binary 4U 1608-52
Juri Poutanen, Joonas Nättilä, Jari J. E. Kajava +4
Spectral measurements of thermonuclear (type-I) X-ray bursts from low mass X-ray binaries have been used to measure neutron star (NS) masses and radii. A number of systematic issue…
XMM-Newton and Swift observations of WZ Sge: spectral and timing analysis
A. A. Nucita, E. Kuulkers, F. De Paolis +3
WZ Sagittae is the prototype object of a subclass of dwarf novae, with rare and long (super)outbursts, in which a white dwarf primary accretes matter from a low mass companion. Hig…
The 2011 Outburst of Recurrent Nova T Pyx: X-ray Observations Expose the White Dwarf Mass and Ejection Dynamics
Laura Chomiuk, Thomas Nelson, Koji Mukai +9
The recurrent nova T Pyx underwent its sixth historical outburst in 2011, and became the subject of an intensive multi-wavelength observational campaign. We analyze data from the S…
Characterizing the Evolving X-Ray Spectral Features During a Superburst from 4U 1636-536
L. Keek, D. R. Ballantyne, E. Kuulkers +1
Recent studies have shown that runaway thermonuclear burning of material accreted onto neutron stars, i.e. Type I X-ray bursts, may affect the accretion disk. We investigate this b…