6 papers
Searching for optical pulsations from spider millisecond pulsars with the fast photometer SiFAP2
Christian Malacaria, Alessandro Papitto, Filippo Ambrosino +19
Optical pulsations from millisecond pulsars (MSPs) have recently been discovered from a transitional MSP and an accreting MSP. Evidence for optical pulsations has also been found f…
Discovery of Polarized X-Ray Emission from the Accreting Millisecond Pulsar SRGA J144459.2-604207
Alessandro Papitto, Alessandro Di Marco, Juri Poutanen +22
We report on the discovery of polarized X-ray emission from an accreting millisecond pulsar. During a 10-day-long coverage of the February 2024 outburst of SRGA J144459.2-604207, t…
Gravitational self-lensing of Fast Radio Bursts in neutron star magnetospheres: I. The model
Simone Dall'Osso, Riccardo La Placa, Luigi Stella +2
Fast Radio Bursts (FRBs) are cosmological sub-second bursts of coherent radio emission, whose source is still unknown. To date, the galactic magnetar SGR 1935+2154 is the only astr…
Spying on the quickly variable optical sky with the fast optical photometer SiFAP2
Giulia Illiano, Alessandro Papitto, Filippo Ambrosino +3
The development of detectors with a high time resolution has been pivotal to our comprehension of neutron stars and the accurate measurement of their properties. While high-time re…
Neutron Star Radius-to-mass Ratio from Partial Accretion Disc Occultation as Measured through Fe K Line Profiles
Riccardo La Placa, Luigi Stella, Alessando Papitto +5
We present a new method to measure the radius-to-mass ratio (R/M) of weakly magnetic, disc-accreting neutron stars by exploiting the occultation of parts of the inner disc by the s…
A new approximation of photon geodesics in Schwarzschild spacetime
Riccardo La Placa, Pavel Bakala, Luigi Stella +1
In this research note we introduce a new approximation of photon geodesics in Schwarzschild spacetime which is especially useful to describe highly bent trajectories, for which the…