40 citations · 191 across the 11 of their papers we have counts for
11 papers
QED cross sections in strong magnetic fields
Olavi Kiuru, Joonas Nättilä, Risto Paatelainen +1
The magnetospheres of magnetars, a class of highly magnetized neutron stars, host magnetic fields exceeding the Schwinger limit, where Quantum Electrodynamics (QED) becomes nonline…
Is the atmosphere of the ultra-hot Jupiter WASP-121b variable?
Quentin Changeat, Jack W. Skinner, James Y-K. Cho +12
We present a comprehensive analysis of the Hubble Space Telescope observations of the atmosphere of WASP-121 b, a ultra-hot Jupiter. After reducing the transit, eclipse, and phase-…
artpol: Analytical ray-tracing method for spectro-polarimetric properties of accretion disks around Kerr black holes
Vladislav Loktev, Alexandra Veledina, Juri Poutanen +2
Spectro-polarimetric signatures of accretion disks in X-ray binaries and active galactic nuclei contain information about the masses and spins of their central black holes, as well…
Snowmass 2021 Cosmic Frontier White Paper: The Dense Matter Equation of State and QCD Phase Transitions
Slavko Bogdanov, Emmanuel Fonseca, Rahul Kashyap +26
Our limited understanding of the physical properties of matter at ultra-high density, high proton/neutron number asymmetry, and low temperature is presently one of the major outsta…
A fully-kinetic model for orphan gamma-ray flares in blazars
Emanuele Sobacchi, Joonas Nättilä, Lorenzo Sironi
Blazars emit a highly-variable non-thermal spectrum. It is usually assumed that the same non-thermal electrons are responsible for the IR-optical-UV emission (via synchrotron) and…
Oblate Schwarzschild approximation for polarized radiation from rapidly rotating neutron stars
Vladislav Loktev, Tuomo Salmi, Joonas Nättilä +1
We have developed a complete theory for the calculation of the observed Stokes parameters for radiation emitted from the surface of a rapidly rotating neutron star (NS) using the o…
Magnetospheric return-current-heated atmospheres of rotation-powered millisecond pulsars
Tuomo Salmi, Valery F. Suleimanov, Joonas Nättilä +1
We computed accurate atmosphere models of rotation-powered millisecond pulsars in which the polar caps of a neutron star (NS) are externally heated by magnetospheric return current…
Kilohertz quasi-periodic oscillations from neutron star spreading layers
Pavel Abolmasov, Joonas Nättilä, Juri Poutanen
When the accretion disc around a weakly magnetised neutron star (NS) meets the stellar surface, it should brake down to match the rotation of the NS, forming a boundary layer. As t…
Evidence for the photoionization absorption edge in a photospheric radius expansion X-ray burst from GRS 1747312 in Terzan 6
Zhaosheng Li, Valery F. Suleimanov, Juri Poutanen +4
Thermonuclear X-ray bursts on the surface of neutron stars (NSs) can enrich photosphere with metals, which may imprint the photoionization edges on the burst spectra. We report her…
Bayesian parameter constraints for neutron star masses and radii using X-ray timing observations of accretion-powered millisecond pulsars
T. Salmi, J. Nättilä, J. Poutanen
We present a Bayesian method to constrain the masses and radii of neutron stars (NSs) using the information encoded in the X-ray pulse profiles of accreting millisecond pulsars. We…
Basic parameters of the helium accreting X-ray bursting neutron star in 4U 1820-30
Valery F. Suleimanov, Jari J. E. Kajava, Sergey V. Molkov +4
The ultracompact low-mass X-ray binary 4U 1820-30 situated in the globular cluster NGC 6624 has an orbital period of only 11.4 min which likely implies a white dwarf compa…