M. Á. Aloy
A5061203490- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- High-Energy Particle Collisions Research
- Computational Fluid Dynamics and Aerodynamics
- Laser-Plasma Interactions and Diagnostics
- Corneal surgery and disorders
- Numerical methods for differential equations
- Astrophysics and Star Formation Studies
- Methane Hydrates and Related Phenomena
- Astronomical Observations and Instrumentation
- Geomagnetism and Paleomagnetism Studies
- Ophthalmology and Visual Impairment Studies
Parc Científic de la Universitat de València
2022-2024
Universitat de València
2015-2024
Sapienza University of Rome
2015
Yunnan Observatories
2010-2011
Chinese Academy of Sciences
2010-2011
Chiba University
2009
Max Planck Institute for Extraterrestrial Physics
2002-2007
Max Planck Society
2002-2007
Max Planck Institute for Astrophysics
2000-2007
University of Wisconsin–Madison
2007
We present the results from three gravitational-wave searches for coalescing compact binaries with component masses above <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msub><a:mrow><a:mi>M</a:mi></a:mrow><a:mrow><a:mo stretchy="false">⊙</a:mo></a:mrow></a:msub></a:mrow></a:math> during first and second observing runs of advanced detector network. During run (<d:math...
On 2017 August 17, the gravitational-wave event GW170817 was observed by Advanced LIGO and Virgo detectors, gamma-ray burst (GRB) GRB 170817A independently Fermi Gamma-ray Burst Monitor, Anticoincidence Shield for Spectrometer International Gamma-Ray Astrophysics Laboratory. The probability of near-simultaneous temporal spatial observation occurring chance is $5.0\times 10^{-8}$. We therefore confirm binary neutron star mergers as a progenitor short GRBs. association provides new insight...
On 17 August 2017, the LIGO and Virgo observatories made first direct detection of gravitational waves from coalescence a neutron star binary system. The this gravitational-wave signal, GW170817, offers novel opportunity to directly probe properties matter at extreme conditions found in interior these stars. initial, minimal-assumption analysis data placed constraints on tidal effects coalescing bodies, which were then translated radii. Here, we expand upon previous analyses by working under...
On August 17, 2017, the Advanced LIGO and Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of source signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as host galaxy. In this work, we improve estimates binary's properties, including component masses, spins, tidal parameters, using known location, improved modeling, recalibrated data. We extend range frequencies considered down 23 Hz, compared 30 Hz in...
We present results on the mass, spin, and redshift distributions with phenomenological population models using ten binary black hole mergers detected in first second observing runs completed by Advanced LIGO Virgo. constrain properties of (BBH) mass spectrum a range parameterizations BBH spin distributions. find that distribution more massive such binaries is well approximated no than 1% holes $45\,M_\odot$, power law index $\alpha = {1.3}^{+1.4}_{-1.7}$ (90% credibility). also show BBHs are...
The detection of gravitational waves by Advanced LIGO and Virgo provides an opportunity to test general relativity in a regime that is inaccessible traditional astronomical observations laboratory tests. We present four tests the consistency data with binary black hole waveforms predicted relativity. One subtracts best-fit waveform from checks residual detector noise. second low- high-frequency parts observed signals. third phenomenological deviations introduced model (including...
On 2019 April 25, the LIGO Livingston detector observed a compact binary coalescence with signal-to-noise ratio 12.9. The Virgo was also taking data that did not contribute to detection due low ratio, but were used for subsequent parameter estimation. 90% credible intervals component masses range from 1.12 2.52 $M_{\odot}$ (1.45 1.88 if we restrict dimensionless spin magnitudes be smaller than 0.05). These mass parameters are consistent individual components being neutron stars. However,...
The recent discovery by Advanced LIGO and Virgo of a gravitational wave signal from binary neutron star inspiral has enabled tests general relativity (GR) with this new type source. This source, for the first time, permits strong-field dynamics compact binaries in presence matter. In Letter, we place constraints on dipole radiation possible deviations GR post-Newtonian coefficients that govern regime. Bounds modified dispersion waves are obtained; combination information observed...
Short gamma-ray bursts (SGRBs) are among the most luminous explosions in universe, releasing less than one second energy emitted by our Galaxy over year. Despite decades of observations, nature their "central engine" remains unknown. Considering a binary magnetized neutron stars and solving Einstein equations, we show that merger results rapidly spinning black hole surrounded hot highly torus. Lasting 35 ms much longer previous simulations, study reveals magnetohydrodynamical instabilities...
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
The stochastic gravitational-wave background is a superposition of sources that are either too weak or numerous to detect individually. In this study, we present the results from cross-correlation analysis on data Advanced LIGO's second observing run (O2), which combine with first (O1). We do not find evidence for background, so place upper limits normalized energy density in gravitational waves at 95% credible level...
This paper presents the gravitational-wave measurement of Hubble constant ($H_0$) using detections from first and second observing runs Advanced LIGO Virgo detector network. The presence transient electromagnetic counterpart binary neutron star GW170817 led to standard-siren $H_0$. Here we additionally use black hole in conjunction with galaxy catalogs report a joint measurement. Our updated is $H_0 = 68.7^{+17.0}_{-7.8}$ km/s/Mpc (68.3\% highest density posterior interval flat-in-log prior)...
Abstract We perform a statistical standard siren analysis of GW170817. Our does not utilize knowledge NGC 4993 as the unique host galaxy optical counterpart to Instead, we consider each within GW170817 localization region potential host; combining redshifts from all galaxies with distance estimate provides an Hubble constant, H 0 . Considering brighter than equally likely binary neutron star merger, find km s −1 Mpc (maximum posteriori and 68.3% highest density posterior interval; assuming...
We present an Advanced LIGO and Virgo search for sub-solar mass ultracompact objects in data obtained during LIGO's second observing run. In contrast to a previous of from the first run, this includes effects component spin on gravitational waveform. identify no viable wave candidates consistent with binaries at least one between 0.2 - 1.0 solar masses. use null result constrain binary merger rate (0.2 mass, mass) be less than 3.7 x 10^5 Gpc^-3 yr^-1 (1.0 5.2 10^3 yr^-1. Sub-solar are not...
Using a collapsar progenitor model of MacFadyen & Woosley, we have simulated the propagation an axisymmetric jet through collapsing rotating massive star with GENESIS multidimensional relativistic hydrodynamic code. The forms as consequence assumed (constant or variable) energy deposition in range 1050-1051 ergs s-1 within 30 degrees cone around rotation axis. flow is strongly beamed (approximately less than few degrees), spatially inhomogeneous, and time dependent. reaches surface stellar...
<i>Context. <i/> Possible effects of magnetic fields in core collapse supernovae rely on an efficient amplification the weak pre-collapse fields. It has been suggested that magneto-rotational instability (MRI) leads to a rapid growth for these seed Although plenty MRI studies exist accretion disks, application their results is inhibited as physics supernova cores substantially different from discs. <i>Aims. We address problem and saturation by studying its evolution means semi-global...
Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of supermassive black hole (SMBH). We have observed source in western nucleus merging galaxy pair Arp 299 that radiated >1.5x10^52 erg infrared and radio, but was not luminous at optical or X-ray wavelengths. interpret this as TDE with much its emission re-radiated wavelengths dust. Efficient reprocessing dense gas dust may explain difference between theoretical predictions...
We present results of an all-sky search for continuous gravitational waves (CWs), which can be produced by fast spinning neutron stars with asymmetry around their rotation axis, using data from the second observing run Advanced LIGO detectors. Three different semicoherent methods are used to in a gravitational-wave frequency band 20 1922 Hz and first derivative $\ensuremath{-}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$...
One unanswered question about the binary neutron star coalescence GW170817 is nature of its post-merger remnant. A previous search for gravitational waves targeted high-frequency signals from a possible remnant with maximum signal duration 500 s. Here we revisit scenario focus on longer durations up until end Second Advanced LIGO-Virgo Observing run, 8.5 days after GW170817. The main physical such emission power-law spindown massive magnetar-like We use four independent algorithms varying...
We present the first Advanced LIGO and Virgo search for ultracompact binary systems with component masses between $0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}--1.0\text{ }{M}_{\ensuremath{\bigodot}}$ using data taken September 12, 2015 January 19, 2016. find no viable gravitational wave candidates. Our null result constrains coalescence rate of monochromatic (delta function) distributions nonspinning ($0.2\text{ }{M}_{\ensuremath{\bigodot}}$, }{M}_{\ensuremath{\bigodot}}$) binaries to be...
We present a search for gravitational waves from 221 pulsars with rotation frequencies $\gtrsim 10$ Hz. use advanced LIGO data its first and second observing runs spanning 2015-2017, which provides the highest-sensitivity gravitational-wave so far obtained. In this we target emission both $l = m 2$ mass quadrupole mode, frequency at twice that of pulsar's rotation, 2$, $m 1$ pulsar frequency. The finds no evidence any either For mode search, provide updated upper limits on amplitude, moment,...
When formed through dynamical interactions, stellar-mass binary black holes may retain eccentric orbits ($e>0.1$ at 10 Hz) detectable by ground-based gravitational-wave detectors. Eccentricity can therefore be used to differentiate dynamically-formed binaries from isolated hole mergers. Current template-based searches do not use waveform models associated orbits, rendering the search less efficient systems. Here we present results of a for mergers that inspiral in using data first and second...
We present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed within source distance of approximately 20 Mpc during first and second observing runs Advanced LIGO Virgo. No significant candidate was detected. report detection efficiencies as function waveforms derived multidimensional numerical simulations phenomenological extreme emission models. For neutrino-driven explosions at which we reach 50% efficiency is approaching 5 kpc,...