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Gilles THEUREAU (LPC2E, CNRS-Orléans and Nançay Radio Observatory, Paris Observatory)01/06/2026 14:00
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Mikel Falxa (LPC2E)01/06/2026 14:20
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Pauline Noé (LPC2E), Francesco Iraci (APC, CNRS)01/06/2026 14:40
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01/06/2026 15:00
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Hippolyte Jean Hugo Quelquejay-Leclere (Università degli Studi di Milano-Bicocca)01/06/2026 15:10
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Aditya Parthasarathy (ASTRON)01/06/2026 15:30
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Jérome Petri (Observatoire astronomique de Strasbourg)01/06/2026 15:50
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01/06/2026 16:10
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Serena Valtolina01/06/2026 16:20
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Beatrice Moreschi (Milano Bicocca)01/06/2026 16:40
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Antoine Petiteau (CEA/IRFU/DPhP)01/06/2026 17:00
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Alberto Sesana02/06/2026 16:00
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Gilles THEUREAU (LPC2E, CNRS-Orléans and Nançay Radio Observatory, Paris Observatory)02/06/2026 16:15
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Thomas Abbott (Max Planck Institute for Radio Astronomy)02/06/2026 16:30
In this talk, I provide an update on behalf of the Max Planck Institute for Radio Astronomy EPTA Team. I briefly highlight contributions to DR3 as well as the work of individual members of the team. I summarize the status of EPTA observations taken by the Effelsberg Radio Telescope, describe the new ultra-broadband (UBB) receiver and discuss its potential in pulsar timing. I conclude by...
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Siyuan Chen (Shanghai Astronomical Observatory, Chinese Academy of Sciences)02/06/2026 16:45
An important science goal of the radio division at the Shanghai Astronomical Observatory (SHAO) is pulsar timing array (PTA). As such we are also actively taking part in the IPTA as well as regional PTA collaborations, like the European PTA and Chinese PTA. We are working on the combination and analysis of the IPTA DR3, as well as the EPTA DR3. Another focus of the group is on the...
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Dr Aditya Parthasarathy (ASTRON)02/06/2026 17:00
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Selah Melfor03/06/2026 09:00
Radio waves emitted by pulsars experience a frequency-dependence propagation effect caused by free elections in the ionized interstellar medium (IISM), parameterized by the dispersion measure (DM). Temporal variations in the DM of pulsars provide a powerful probe of the density fluctuations of the free electrons in the ionized interstellar medium. These variations provide insight into the...
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Francesco Iraci (APC, CNRS)03/06/2026 09:20
Interstellar turbulence critically influences the propagation of pulsar radio signals, affecting both the timing precision and the interpretation of interstellar plasma properties. While its statistical behaviour in the diffuse ionised medium is relatively well described by a Kolmogorov-like spectrum, the nature of turbulence within discrete structures such as HII regions remains poorly...
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Sofia Sosa Fiscella (ASTRON)03/06/2026 09:40
Radio pulsars exhibit frequency-dependent variations in the shape of their pulse profiles that introduce systematic delays in the pulse times of arrival (TOA) across an observing band. Some Pulsar Timing Arrays model these delays using a frequency-dependent (FD) log-polynomial function whose coefficients are fit to TOA measurements. However, these FD parameters are prone to absorbing power...
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Mark Brionne (INAF-OA Cagliari)03/06/2026 10:00
DR3 will add low-frequency data from LOFAR and NenuFAR. A characteristic of low-frequency pulsar observations is their high sensitivity to the diverse effects of propagation through a plasma. Adding these data is thereby useful for determining the various chromatic noises more accurately. In addition to being more sensitive to interstellar medium variations, low-frequency data become sensitive...
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Bence Becsy (University of Birmingham)03/06/2026 11:00
Building on our recent work on continuous-wave searches in PTA data, this talk will discuss possible strategies for testing the origin of low-frequency CW candidates identified in recent EPTA and NANOGrav analyses, including the persistent 4 nHz feature. I will outline ideas for studying how candidate significance and coherence change across datasets and array combinations, with the aim of...
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Sara Manzini (APC - Université Paris Cité)03/06/2026 11:20
Pulsar timing array (PTA) experiments are designed to detect gravitational waves (GWs) at nano-hertz frequencies. Supermassive black hole binaries (SMBHBs) represent the most plausible astrophysical sources in this band. The superposition of GWs emitted by the entire SMBHB population produces a stochastic GW background (GWB). Particularly massive and nearby SMBHBs can produce signals strong...
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Hippolyte Jean Hugo Quelquejay-Leclere (Università degli Studi di Milano-Bicocca)03/06/2026 11:40
By monitoring the times of arrival of radio pulses from millisecond pulsars, Pulsar Timing Arrays (PTAs) serve as unique gravitational wave (GW) laboratories in the nanohertz band. To date, the primary astrophysical sources of GWs targeted in this frequency range have been inspiraling supermassive black hole binaries (SMBHBs) on circular and eccentric orbits. In this work, we demonstrate that,...
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Lankeswar Dey (Institute of Astrophysics, FORTH)03/06/2026 12:00
Most searches for continuous gravitational waves (CGWs) from individual supermassive black hole binaries (SMBHBs) in pulsar timing array (PTA) data assume circular orbits, despite theoretical studies suggesting that these sources may retain significant eccentricity. In this talk, I will present QuickGWecc, a fast and efficient Bayesian pipeline for searching for CGWs from SMBHBs in...
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Adrien Cogez (CEA/IRFU/DPhP)03/06/2026 12:20
The search for the non-linear memory effect, which is a permanent strain in spacetime that remains after the passage of a gravitational wave (GW), has been ongoing in PTA data for years, using a simple burst model. With the upcoming IPTA-DR3, a working group has been formed to research memories (both linear and nonlinear). In this talk, we will present the preliminary work carried out to...
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Nataliya Porayko (MPIfR)03/06/2026 16:00
I would like to give an overview of activities undertaken in the Interpretation WG.
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Delphine Perrodin03/06/2026 16:20
The second data release of the European Pulsar Timing Array (EPTA) collaboration provides
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evidence for the presence of a gravitational-wave (GW) background. In this work, we explore a
potential cosmological interpretation of this signal in terms of inflationary scenarios. We parametrize
the tensor power spectrum in terms of the tensor-to-scalar ratio r, the tensor spectral index nt,... -
Ludovica Carbone (University of Milano-Bicocca)03/06/2026 16:40
Accurate localisation of continuous gravitational waves (CGWs) from supermassive black hole binaries (SMBHBs) remains one of the key challenges in Pulsar Timing Array (PTA) data analysis. Traditional searches based on the $\mathcal{F}_e$ statistic provide a robust analytic framework, but the resulting sky maps are strongly affected by the PTA antenna pattern, which redistributes signal power...
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Maria Charisi (IA-FORTH & Washington State University)03/06/2026 17:00
Supermassive black hole binaries (SMBHBs) are exceptional multi-messenger targets, since on top of their low-frequency gravitational waves (GW), they may emit bright electromagnetic (EM) emission. I will describe a recently developed joint likelihood method that combines EM and pulsar timing array (PTA) data, which was shown to improve the binary parameter estimation. I will also discuss the...
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Danilo Zecca (Università del Salento)03/06/2026 17:20
We investigated the impact of dispersion measure (DM) variations on the recovery of a stochastic Gravitational Wave Background (GWB) in Pulsar Timing Array (PTA) datasets, extending the chromatic noise analysis of Iraci et al. (2024). We generated multiple synthetic PTA datasets for different configurations of a 25-pulsar array, combining LOFAR-like low-frequency observations with Nançay...
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Massimo Vaglio (SISSA)04/06/2026 09:00
Pulsar Timing Arrays have recently reported strong evidence for a stochastic gravitational wave background. In standard analyses, this is modeled through pulsar-dependent Fourier coefficients assumed to follow Gaussian statistics, so that the signal is fully characterized by its two-point function. However, if the background arises from a finite population of inspiralling supermassive black...
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Beatrice Eleonora Moreschi (University of Milano-Bicocca)04/06/2026 09:20
Unveiling the nature of the nanoHz gravitational wave signal reported by Pulsar Timing Array collaborations is the next goal of low-frequency GW astronomy. The signal likely originates from the incoherent superposition of GWs emitted by a population of supermassive black hole binaries (SMBHBs). The discrete nature of the population, environmental effects and eccentricity are expected to...
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Martin Pijnenburg04/06/2026 09:40
The compelling evidence for the presence of nHz gravitational waves (GWs) in pulsar timing data calls for a refinement of what can and cannot be expected beyond vanilla scenarios. Under the hypothesis of an astrophysical origin for the GWs, we discuss possible imprints left in the signal by the fact the Universe is inherently clustered, with anisotropic large scale structure.
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At the... -
Mikel Falxa04/06/2026 10:00
Pulsar Timing Array (PTA) data are challenging to analyze due to their uneven sampling and the presence of observational gaps. In gravitational wave (GW) searches with PTA data, the signal is expected to dominate primarily at low frequencies, motivating the question of whether the data can be efficiently downsampled without significant loss of information. We propose a method to generate...
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Serena Valtolina04/06/2026 11:00
Accurately modelling pulsar noise is one of the main challenges for current radio PTA experiments. For many pulsars, the data are not informative enough to efficiently solve the covariance between chromatic and achromatic processes. In gamma-ray PTA (GPTA) experiments instead, the sensitivity to stochastic processes is limited by the low photon flux of gamma-ray pulsar observations; thus, the...
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Yang Liu (Shanghai Astronomical Observatory, Chinese Academy of Sciences)04/06/2026 11:20
This project aims to investigate optimal observational modes of radio interferometric arrays for diverse scientific goals (e.g., PTAs) using numerical simulation tools.
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We develop an open-source software framework capable of generating simulated pulsar timing data and injecting multiple signals, including gravitational waves. Leveraging existing observational datasets, we use this framework... -
Egor Ledenev (MSU SAI), Viacheslav Chernosov (MIPT)04/06/2026 11:40
In this work, we consider the case of a model GWB source with a Gaussian power spectrum on a sphere, and obtain an analytical expression of the overlap reduction function of the signals of two pulsars, which generalizes the previously obtained expressions for isotropic and delta-shaped model sources. Using the generalized correlation function allows us to determine the characteristic angular...
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Irene Ferranti (University of Milano-Bicocca)04/06/2026 12:00
The EPTA+InPTA DR2new+ dataset has recently been combined with low-frequency measurements from LOFAR and NenuFAR (Iraci et al., 2025), with the aim of generating a dataset capable of disentangling the DM variation noise from achromatic red noise and the stochastic background. Simulations have shown that better distinguishing between these components is expected to improve sensitivity to the...
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Aurélien Chalumeau (ASTRON)
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Aurélien Chalumeau (ASTRON), Nataliya Porayko (MPIfR)
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