Name: Multi-messenger Continuous Gravitational Waves
Start: 2023-07-11T09:00:00+02:00
End: 2023-07-13T18:50:00+02:00
Location: Amsterdam, NL

Multi-messenger Continuous Gravitational Waves

from Tuesday, 11 July 2023 (09:00) to Thursday, 13 July 2023 (18:50)

Monday, 10 July 2023
Tuesday, 11 July 2023

09:00 Welcome
Welcome
09:00 - 09:10
09:10 Continuous Waves - a review so far - David Keitel (david.keitel@uib.es)
Continuous Waves - a review so far
- David Keitel (david.keitel@uib.es)
09:10 - 09:50
Finding continuous waves from spinning neutron stars and other long-lived sources is a highly challenging data analysis problem. We need to dig extremely weak signals out of large data sets while covering huge unknown parameter spaces. I will review past efforts of the LVK collaboration and wider community and the current state of the field at the start of O4.
09:50
09:50 - 11:40
Contributions

09:50 Universal relations to measure neutron star properties from targetedr-mode searches - Suprovo Ghosh (IUCAA)

10:10 Neutron star crust deformations, solar system mountains, and gravitational waves - Jorge Morales (Indiana University - Bloomington and Max Planck Institute for Gravitational Physics)

10:30 Modelling magnetically formed neutron star mountains - Amlan Nanda (University of Tokyo)

11:20 Gravitational waves from magnetar glitches and anti-glitches - Garvin Yim (Kavli Institute for Astronomy and Astrophysics, Peking University)
11:40
11:40 - 12:40
Contributions

11:40 Continuous gravitational waves from unknown neutron stars in binary systems - Josep Blai Covas Vidal

12:00 Deep Einstein@Home all-sky search for continuous gravitational waves in LIGO O3a public data - Benjamin Steltner (Max Planck Institute for Gravitational Physics)

12:20 Not-so-blind searches for young, isolated, nearby gravitars - Rodrigo Tenorio (University of the Balearic Islands)
12:40 Lunch
Lunch
12:40 - 13:40
13:40 Broad parameter space searches and machine learning - Joe Bayley (University of Glasgow)
Broad parameter space searches and machine learning
- Joe Bayley (University of Glasgow)
13:40 - 15:10
One of the key sources for LIGO-Virgo-Kagra is rapidly spinning neutron stars. These long duration and weak signals introduce many computational challenges including analysing large volumes of data and a wide parameter spaces. When searching for continuous signals with no prior knowledge of its frequency evolution, typical matched filtering approaches become computationally infeasible leading to a need for different analysis techniques. I will introduce one search called SOAP which covers a broad parameter space and discuss how machine learning can be used to aid with these searches.
15:10 coffee break
coffee break
15:10 - 15:40
15:40
15:40 - 17:00
Contributions

15:40 GWLab - Hannah Middleton (University of Birmingham)

16:00 A new method to search for long-duration gravitational wave signals - Liudmila Fesik (Max Planck Institute for Gravitational Physics)

16:20 Properties of a multi-template search for a transient signal - Liudmila Fesik (Max Planck Institute for Gravitational Physics)

16:40 A novel neural-network architecture for continuous gravitational waves - Prasanna Mohan Joshi (Max Planck Institute for Gravitational Physics)
18:15 Conference Dinner
Conference Dinner
18:15 - 21:00
Wednesday, 12 July 2023
09:00 Application of matched-filtering to analysis of nearly periodic gravitational wave signals - Andrzej Krolak (Institute of Mathematics, Polish Academy of Sciences)
Application of matched-filtering to analysis of nearly periodic gravitational wave signals
- Andrzej Krolak (Institute of Mathematics, Polish Academy of Sciences)
09:00 - 10:30
Basic mathematical concepts of gravitational-wave data analysis will be introduced. In particular statistical principles of detection of signals in noise and estimation of their parameters are presented. Derivation of the matched-filtering statistic for signal consisting of a linear combination of several functions of unknown parameters will be presented. The case of amplitude and frequency modulated signal with application to continuous gravitational wave signals will be discussed in detail. I shall present codes to for detections and parameter estimation of three types of gravitational wave signals: 1. Monchromatic signal. 2. Signal from r-mode instabilities in a known pulsar. 3. Postmerger signal after binary neutron star merger and ringdown signal after binary black hole merger.
10:30 coffee break
coffee break
10:30 - 11:00
11:00
11:00 - 12:00
Contributions

11:00 Fast optical photometry of Sco X-1 with SiFAP2@TNG - Filippo Ambrosino (INAF-Osservatorio Astronomico di Roma)

11:20 The TRAPUM Survey for New Gamma-ray Pulsars - Colin Clark (Max Planck Institute for Gravitational Physics (Albert Einstein Institute))

11:40 Measuring the magnetic dipole moment and magnetospheric fluctuations of SXP 18.3 with a Kalman filter - Joe OLeary (The university of Melbourne)
12:00

12:00 - 13:00

13:00 Lunch
Lunch
13:00 - 14:30
14:30 Radio monitoring of the pulsars as potential continuous GW sources - Andrea Possenti
Radio monitoring of the pulsars as potential continuous GW sources
- Andrea Possenti
14:30 - 16:00
The rotational history of the neutron star underlying a radio pulsar can be tracked by performing repeated observations of the time of arrival of its pulses, via a procedure called “pulsar timing”. This presentation introduces the basics of this kind of experiments, and their applicability in the aim of enhancing the sensitivity of the GW detectors to a sample of continuous GW sources.
16:00 coffee break
coffee break
16:00 - 16:30
16:30
16:30 - 17:30
Contributions

16:30 Targeted searches for continuous gravitational waves - Anjana Ashok (Max Planck Institute for Gravitational Physics)

16:50 Continuous gravitational waves from Galactic neutron stars: demography, detectability and prospects. - Gianluca Pagliaro (Max Planck Institute for Gravitational Physics / Leibniz University Hannover)

17:10 How to search for continuous gravitational waves while allowing the frequency to wander: selected results using O3 LIGO data - Andrés Vargas Sánchez (The University of Melbourne)
17:30
17:30 - 18:30
Contributions

17:30 Sequential simulation-based inference for gravitational waves - Uddipta Bhardwaj (GRAPPA, University of Amsterdam)

17:50 A high frequency GW detector to look for CW GWs from BH superradiance - Nancy Aggarwal (Northwestern)

18:10 Detectability of continuous gravitational waves with future interferometers - Benjamin Owen (Texas Tech University)
Thursday, 13 July 2023
09:00 Making sense of narrow spectral artifacts - Ansel Neunzert
Making sense of narrow spectral artifacts
- Ansel Neunzert
09:00 - 10:30
Narrow spectral noise artifacts can degrade the sensitivity of continuous wave searches, creating spurious outliers or casting doubt on nearby signal candidates. This tutorial will review some basics of CW detector characterization and walk participants through investigating example artifacts from O3. The tutorial is intended to give participants a better understanding of how LIGO line lists are compiled, what challenges arise in characterizing these artifacts, and what kinds of detector characterization investigations can help to strengthen or dismiss a continuous wave candidate signal.
10:30 coffee break
coffee break
10:30 - 11:00
11:00 A precision orbital ephemeris for Sco X-1 - Thomas Killestein (University of Warwick)
A precision orbital ephemeris for Sco X-1
- Thomas Killestein (University of Warwick)
11:00 - 12:30
The low-mass X-ray binary Sco X-1 remains the key target for CWG searches, given that it by far outstrips other candidates in terms of expected strain. Efficient searches require the orbit of the NS to be well-constrained. We have been exploiting optical emission lines that trace the binary companion star in the system for over 20 years now. These Bowen fluorescence lines have been an important probe of binary parameters in a number of XRBs, but in the case of Sco X-1 our focus has been to provide a robust and precise ephemeris for the binary orbit of the neutron star. We will review the technique to highlight how we have not just improved the precision over time, but also have addressed some of the possible systematics of the method and ensure that robust parameter uncertainties can be derived. Whilst this has allowed us to obtain very precise timings for the overall phasing of the neutron star orbit, other parameters relevant to CWG searches (asini, e, ...) remain difficult to constrain accurately. We discuss these limitations as well as prospects for continuing to keep the ephemeris accurate during O4 and beyond.
12:30 Lunch
Lunch
12:30 - 13:30
13:30 F-statistic analyses with lalpulsar and PyFstat - David Keitel (david.keitel@uib.es) Rodrigo Tenorio (Universitat de les Illes Balears)
F-statistic analyses with lalpulsar and PyFstat
- David Keitel (david.keitel@uib.es)
- Rodrigo Tenorio (Universitat de les Illes Balears)
13:30 - 14:10
The F-statistic is one of the standard methods for CW searches. We will look at its general motivation from both Frequentist and Bayesian perspectives, its frequency-domain implementation in lalpulsar, and the practical aspects of both coherent and semicoherent searches based on it. We will then use the python package PyFstat for some interactive practical examples.
14:10
14:10 - 15:10
Contributions

14:10 MATINS: a new 3D code for the magnetothermal evolution of isolated neutron stars - Stefano Ascenzi (Stefano Ascenzi)

14:30 The importance of neutron star oscillation modes in constraining the neutron star EoS and nuclear parameters from GW observations of binary and isolated neutron stars. - Bikram Keshari Pradhan (IUCAA)

14:50 Tidal oscillations of neutron stars in eccentric binary systems - János Takátsy (Wigner Research Centre for Physics)
15:10

15:10 - 17:10