Conference: Meeting of the National Research Group on Gravitational Waves

Session

Contributed talks: Neutron stars, supernovae and heavy elements

30 mars 2021, 15:30

Amphithéâtre Hermite (Institut Henri Poincaré)

44. GW190814: On the properties of the secondary component of the binary

M. BHASKAR BISWAS (IUCAA, Pune )

30/03/2021 15:30

ÉTOILES A NEUTRONS, SUPERNOVÆ ET SYNTHÈSES DES ÉLÉMENTS LOURDS

We show that the odds of the mass-gap (secondary) object in GW190814 being a neutron star (NS) improve if one allows for a stiff high-density equation of state (EoS) or a large spin. Since its mass is $\in (2.50,2.67) M_{\odot}$, establishing its true nature will make it either the heaviest NS or the lightest black hole (BH), and can have far-reaching implications on NS EoS and compact object...

63. What can be learned from a proto-neutron star's mass and radius ?

Edwan PREAU (APC)

30/03/2021 15:45

ÉTOILES A NEUTRONS, SUPERNOVÆ ET SYNTHÈSES DES ÉLÉMENTS LOURDS

We make extensive numerical studies of masses and radii of proto-neutron stars during the first second after their birth in core-collapse supernova events. We use a quasi-static approach for the computation of proto-neutron star structure, built on parameterized entropy and electron fraction profiles, that are then evolved with neutrino cooling processes. We vary the equation of state of...

67. Gravitational wave signature of proto-neutron star convection

Raphaël Raynaud (CEA Saclay)

30/03/2021 16:30

ÉTOILES A NEUTRONS, SUPERNOVÆ ET SYNTHÈSES DES ÉLÉMENTS LOURDS

Gravitational waves provide a unique opportunity to better constrain the dynamics in the interior of proto-neutron stars during core collapse supernovae. Convective motions inside the proto-neutron star play an important role in determining neutron star magnetic fields. In paticular, numerical models suggest that a convective dynamo could explain magnetar formation in presence of fast...

74. Influence of the crust on neutron star macrophysical quantities and universal relations

Lami Suleiman (Laboratoire Univers et Théories et Centre d'Astronomie Nicolas Copernic (Pologne))

30/03/2021 16:45

ÉTOILES A NEUTRONS, SUPERNOVÆ ET SYNTHÈSES DES ÉLÉMENTS LOURDS

Measurements of neutron star macrophysical properties thanks to multi-messenger observations offer the possibility to constrain the properties of nuclear matter. Indeed cold and dense matter as found inside neutron stars, in particular in their core, is not accessible to terrestrial laboratories.

We investigate the consequences of using equations of state that employ models for the core and...