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Evidence of Shock-Driven Turbulence in the Solar Chromosphere
K. P. Reardon, F. Lepreti, V. Carbone +1
We study the acoustic properties of the solar chromosphere in the high-frequency regime using a time sequence of velocity measurements in the chromospheric Ca II 854.2 nm line take…
Gravitational waves from resolvable massive black hole binary systems and observations with Pulsar Timing Arrays
A. Sesana, A. Vecchio, M. Volonteri
Massive black holes are key components of the assembly and evolution of cosmic structures and a number of surveys are currently on-going or planned to probe the demographics of the…
Search for Gravitational Wave Bursts from Soft Gamma Repeaters
LIGO Scientific Collaboration, S. Barthelmy, N. Gehrels +2
We present the results of a LIGO search for short-duration gravitational waves (GWs) associated with Soft Gamma Repeater (SGR) bursts. This is the first search sensitive to neutron…
The solar chromosphere at high resolution with IBIS. II. Acoustic shocks in the quiet internetwork and the role of magnetic fields
A. Vecchio, G. Cauzzi, K. P. Reardon
(Abridged) Aims: We characterize the dynamics of the quiet inter-network chromosphere by studying the occurrence of acoustic shocks and their relation with the concomitant photosph…
Beating the spin-down limit on gravitational wave emission from the Crab pulsar
The LIGO Scientific Collaboration, B. Abbott, R. Abbott +440
We present direct upper limits on gravitational wave emission from the Crab pulsar using data from the first nine months of the fifth science run of the Laser Interferometer Gravit…
The stochastic gravitational-wave background from massive black hole binary systems: implications for observations with Pulsar Timing Arrays
Alberto Sesana, Alberto Vecchio, Carlo Nicola Colacino
Massive black hole binary systems, with masses in the range ~10^4-10^10 \msun, are among the primary sources of gravitational waves in the frequency window ~10^-9 Hz - 0.1 Hz. Puls…
Gravitational-Wave Astronomy with Inspiral Signals of Spinning Compact-Object Binaries
M. V. van der Sluys, C. Roever, A. Stroeer +6
Inspiral signals from binary compact objects (black holes and neutron stars) are primary targets of the ongoing searches by ground-based gravitational-wave interferometers (LIGO, V…
The solar chromosphere at high resolution with IBIS. I. New insights from the Ca II 854.2 nm line
G. Cauzzi, K. P. Reardon, H. Uitenbroek +7
(Abridged) Aims: In this paper, we seek to establish the suitability of imaging spectroscopy performed in the Ca II 854.2 nm line as a means to investigate the solar chromosphere a…
Probing white dwarf interiors with LISA: periastron precession in double white dwarfs
B. Willems, A. Vecchio, V. Kalogera
In globular clusters, dynamical interactions give rise to a population of eccentric double white dwarfs detectable by the Laser Interferometer Space Antenna (LISA) up to the Large…
Eccentric double white dwarfs as LISA sources in globular clusters
B. Willems, V. Kalogera, A. Vecchio +4
We consider the formation of double white dwarfs (DWDs) through dynamical interactions in globular clusters. Such interactions can give rise to eccentric DWDs, in contrast to the e…
Solar Atmospheric Oscillations and the Chromospheric Magnetic Topology
A. Vecchio, G. Cauzzi, K. P. Reardon +2
We investigate the oscillatory properties of the quiet solar chromosphere in relation to the underlying photosphere, with particular regard to the effects of the magnetic topology.…
LISA astronomy of double white dwarf binary systems
A. Stroeer, A. Vecchio, G. Nelemans
The Laser Interferometer Space Antenna (LISA) will provide the largest observational sample of (interacting) double white dwarf binaries, whose evolution is driven by radiation rea…
Gravitational waves, inflation and the cosmic microwave background: towards testing the slow-roll paradigm
Carlo Ungarelli, Pier Stefano Corasaniti, R. A. Mercer +1
One of the fundamental and yet untested predictions of inflationary models is the generation of a very weak cosmic background of gravitational radiation. We investigate the sensiti…
LISA observations of rapidly spinning massive black hole binary systems
Alberto Vecchio
Binary systems of massive black holes will be detectable by the Laser Interferometer Space Antenna (LISA) throughout the entire Universe. Observations of gravitational waves from t…
The GEO600 Gravitational Wave Detector -- Pulsar Prospects
G. Woan
The GEO600 laser-interferometric gravitational wave detector near Hannover, Germany, is one of six such interferometers now close to operation worldwide. The UK/German GEO collabor…
Studying the anisotropy of the gravitational wave stochastic background with LISA
C. Ungarelli, A. Vecchio
A plethora of gravitational wave stochastic backgrounds populate the sensitivity window of the Laser Interferometer Space Antenna. We show that LISA can detect the anisotropy of th…
Orbital Evolution of a Massive Black Hole Pair by Dynamical Friction
A. Vecchio, M. Colpi, A. Polnarev
We investigate the evolution of a massive black hole pair under the action of dynamical friction (DF) by a uniform background of light stars with isotropic velocity distribution. I…