A. M. Sintes
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View article: AT2025ulz and S250818k: Zooming in with the Hubble Space Telescope
AT2025ulz and S250818k: Zooming in with the Hubble Space Telescope Open
AT2025ulz is an optical/near-infrared transient discovered during follow-up of the candidate gravitational wave (GW) event S250818k. Its young age (≲1 day), rapid decline, and strong color evolution over the first 48 hr classify it as a po…
View article: GPU-Accelerated Searches for Long-Transient Gravitational Waves from Newborn Neutron Stars
GPU-Accelerated Searches for Long-Transient Gravitational Waves from Newborn Neutron Stars Open
We present a novel method to efficiently search for long-duration gravitational wave transients emitted by new-born neutron star remnants of binary neutron star coalescences or supernovae. The detection of these long-transient gravitationa…
View article: One-stop strategy to search for long-duration gravitational-wave signals
One-stop strategy to search for long-duration gravitational-wave signals Open
Blind continuous gravitational-wave (CWs) searches are a significant computational challenge due to their long duration and weak amplitude of the involved signals. To cope with such problem, the community has developed a variety of data-an…
View article: Assessing the Similarity of Continuous Gravitational-Wave Signals to Narrow Instrumental Artifacts
Assessing the Similarity of Continuous Gravitational-Wave Signals to Narrow Instrumental Artifacts Open
Continuous gravitational-wave (CW) signals are long-lasting quasi-monochromatic gravitational-wave signals expected to be emitted by rapidly rotating non-axisymmetric neutron stars. Depending on the rotational frequency and sky location of…
View article: Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data with Corrected Orbital Ephemeris
Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data with Corrected Orbital Ephemeris Open
Improved observational constraints on the orbital parameters of the low-mass X-ray binary Scorpius X-1 were recently published in Killestein et al. In the process, errors were corrected in previous orbital ephemerides, which have been used…
View article: Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data With Corrected Orbital Ephemeris
Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data With Corrected Orbital Ephemeris Open
Improved observational constraints on the orbital parameters of the low-mass X-ray binary Scorpius~X-1 were recently published in Killestein et al (2023). In the process, errors were corrected in previous orbital ephemerides, which have be…
View article: Empirically estimating the distribution of the loudest candidate from a gravitational-wave search
Empirically estimating the distribution of the loudest candidate from a gravitational-wave search Open
Searches for gravitational-wave signals are often based on maximizing a detection statistic over a bank of waveform templates, covering a given parameter space with a variable level of correlation. Results are often evaluated using a noise…
View article: Detection and characterization of instrumental transients in LISA Pathfinder and their projection to LISA
Detection and characterization of instrumental transients in LISA Pathfinder and their projection to LISA Open
The LISA Pathfinder (LPF) mission succeeded outstandingly in demonstrating key technological aspects of future space-borne gravitational-wave detectors, such as the Laser Interferometer Space Antenna (LISA). Specifically, LPF demonstrated …
View article: Search Methods for Continuous Gravitational-Wave Signals from Unknown Sources in the Advanced-Detector Era
Search Methods for Continuous Gravitational-Wave Signals from Unknown Sources in the Advanced-Detector Era Open
Continuous gravitational waves are long-lasting forms of gravitational radiation produced by persistent quadrupolar variations of matter. Standard expected sources for ground-based interferometric detectors are neutron stars presenting non…
View article: Empirically estimating the distribution of the loudest candidate from a gravitational-wave search
Empirically estimating the distribution of the loudest candidate from a gravitational-wave search Open
Searches for gravitational-wave signals are often based on maximizing a detection statistic over a bank of waveform templates, covering a given parameter space with a variable level of correlation. Results are often evaluated using a noise…
View article: Application of a hierarchical MCMC follow-up to Advanced LIGO continuous gravitational-wave candidates
Application of a hierarchical MCMC follow-up to Advanced LIGO continuous gravitational-wave candidates Open
We present the first application of a hierarchical Markov Chain Monte Carlo (MCMC) follow-up on continuous gravitational-wave candidates from real-data searches. The follow-up uses an MCMC sampler to draw parameter-space points from the po…
View article: OPTICAL SPECTROSCOPY OF CANDIDATES IN THE LIGO/VIRGO BINARY MERGER ERROR BOXES
OPTICAL SPECTROSCOPY OF CANDIDATES IN THE LIGO/VIRGO BINARY MERGER ERROR BOXES Open
We performed optical spectroscopy of the candidates inside the gravitational wave errorboxes (S190408an, S190425z, S190426c, S190510g, S190728q, S190814bv). The spectral classification of 34 transients observed with the 10.4m Gran Telescop…
View article: Time-frequency track distance for comparing continuous gravitational wave signals
Time-frequency track distance for comparing continuous gravitational wave signals Open
Searches for continuous gravitational waves from unknown sources attempt to detect long-lasting gravitational radiation by identifying Doppler-modulated signatures in the data. Semicoherent methods allow for wide parameter space surveys, i…
View article: Site-selection criteria for the Einstein Telescope
Site-selection criteria for the Einstein Telescope Open
The Einstein Telescope (ET) is a proposed next-generation, underground gravitational-wave detector to be based in Europe. It will provide about an order of magnitude sensitivity increase with respect to the currently operating detectors an…
View article: First All-Sky Search for Continuous Gravitational-Wave Signals from Unknown Neutron Stars in Binary Systems Using Advanced LIGO Data
First All-Sky Search for Continuous Gravitational-Wave Signals from Unknown Neutron Stars in Binary Systems Using Advanced LIGO Data Open
Rotating neutron stars can emit continuous gravitational waves, which have not yet been detected. We present a search for continuous gravitational waves from unknown neutron stars in binary systems with orbital period between 15 and 45 day…
View article: New method to search for continuous gravitational waves from unknown neutron stars in binary systems
New method to search for continuous gravitational waves from unknown neutron stars in binary systems Open
Non-axysymmetric, fast-spinning unknown neutron stars in binary systems may emit continuous gravitational waves (nearly-monochromatic long-duration signals) which can be detected by ground-based detectors like LIGO and Virgo. In this paper…
View article: Adaptive transient Hough method for long-duration gravitational wave transients
Adaptive transient Hough method for long-duration gravitational wave transients Open
This paper describes a new semi-coherent method to search for transient\ngravitational waves of intermediate duration (hours to days). In order to\nsearch for newborn isolated neutron stars with their possibly very rapid\nspin-down, we mod…
View article: Matched-filter study and energy budget suggest no detectable gravitational-wave ‘extended emission’ from GW170817
Matched-filter study and energy budget suggest no detectable gravitational-wave ‘extended emission’ from GW170817 Open
Van Putten & Della Valle (2018) have reported a possible detection of gravitational-wave 'extended emission' from a neutron star remnant of GW170817. Starting from the time-frequency evolution and total emitted energy of their reported can…
View article: Comparison of methods for the detection of gravitational waves from unknown neutron stars
Comparison of methods for the detection of gravitational waves from unknown neutron stars Open
Rapidly rotating neutron stars are promising sources of continuous\ngravitational wave radiation for the LIGO and Virgo interferometers. The\nmajority of neutron stars in our galaxy have not been identified with\nelectromagnetic observatio…
View article: Impact of gravitational radiation higher order modes on single aligned-spin gravitational wave searches for binary black holes
Impact of gravitational radiation higher order modes on single aligned-spin gravitational wave searches for binary black holes Open
Current template-based gravitational wave searches for compact binary\ncoalescences (CBC) use waveform models that neglect the higher order modes\ncontent of the gravitational radiation emitted, considering only the\nquadrupolar $(\\ell,|m…