Cinquième Assemblée Générale du GdR Ondes Gravitationnelles

Session

Groupe de Travail: Population des sources

12 oct. 2021, 09:00

LAPP - Laboratoire d'Annecy de Physique des Particules

27. First detections of neutron star-black hole mergers

Astrid Lamberts (Observatoire de la Côte d'Azur)

12/10/2021 09:00

POPULATIONS DES SOURCES

In this talk I will present the detection of NS-BH binary mergers with gravitational waves by the LIGO - Virgo- KAGRA collaboration. I will first present how the events GW200105 and GW200115 were detected: the first was observed by LIGO Livingston and Virgo, and the second
by all three LIGO–Virgo detectors. Then I will detail the main properties of the events and how we establish the...

18. Understanding the stellar progenitors of binary black holes

Rahul Srinivasan (Universite Cote d'Azur)

12/10/2021 09:15

POPULATIONS DES SOURCES

The black holes detected by the LVK gravitational wave detectors have masses (typically 20-50 Msun) that are systematically heavier than those detected in X-ray binaries (5-20 Msun). This mass discrepancy suggests different progenitor stellar environments, especially metallicity, between X-ray binary and gravitational wave black holes. We have built a model Universe that represents star...

6. Source classification of compact binary mergers for the MBTA pipeline candidates

Dimitri Estevez ({CNRS}UMR7178)

12/10/2021 09:30

POPULATIONS DES SOURCES

As the knowledge of the gravitational-wave (GW) sources population is improving, it is possible to compute the probability of astrophysical origin of the GW events and make a source classification.
Rapid source classification in low-latency searches provides useful information for astronomers to undertake a follow-up of the source or not.
In the offline searches, the probability of...

4. Precession resonances in hierarchical triple systems

Adrien Kuntz (Scuola Normale Superiore)

12/10/2021 09:45

POPULATIONS DES SOURCES

A binary system can be resonantly excited by a distant perturber if its precession frequency is equal to the period of the faraway object. I will show how this can dramatically increase the eccentricity of the binary, pushing it to values observables in the LISA band. This phenomenon is new and distinct from the Kozai-Lidov mechanism since it operates in a corner of the parameter space where...

22. Constraints to neutron-star kicks in High-Mass X-ray Binaries with Gaia EDR3

Francis Fortin (APC)

12/10/2021 10:00

POPULATIONS DES SOURCES

All neutron star progenitors in neutron-star High-Mass X-ray Binaries (NS HMXBs) undergo a supernova event that may lead to a significant natal kick impacting the motion of the whole binary system. The space observatory Gaia performs a deep optical survey with exquisite astrometric accuracy, for both position and proper motions, that can be used to study natal kicks in NS HMXBs.

We aim to...