Effects of SASI and LESA in the neutrino emission of rotating supernovae. (arXiv:1901.06235v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Walk_L/0/1/0/all/0/1">Laurie Walk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tamborra_I/0/1/0/all/0/1">Irene Tamborra</a> (Niels Bohr Institute), <a href="http://arxiv.org/find/astro-ph/1/au:+Janka_H/0/1/0/all/0/1">Hans-Thomas Janka</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Summa_A/0/1/0/all/0/1">Alexander Summa</a> (MPA, Garching)
Rotation of core-collapse supernovae (SNe) affects the neutrino emission
characteristics. By comparing the neutrino properties of three
three-dimensional SN simulations of a 15 M_sun progenitor (one non-rotating
model and two models rotating at different velocities), we investigate how the
neutrino emission varies with the flow dynamics in the SN core depending on the
different degrees of rotation. The large-amplitude sinusoidal modulations due
to the standing accretion-shock instability (SASI) are weaker in both the
rotating models than in the non-rotating case. Moreover, the SN progenitor
rotation confines convection interior to the proto-neutron star (PNS) to a
radially narrow layer and suppresses a dipolar asymmetry of the PNS convection,
disfavoring the growth of hemispheric neutrino-emission asymmetries associated
with the lepton-emission self-sustained asymmetry (LESA). An investigation of
the multipole expansion of the neutrino luminosity and the electron neutrino
lepton number flux shows a dominant quadrupolar mode in rotating SN models. Our
findings highlight the power of using neutrinos as probes of SN hydrodynamics.
Rotation of core-collapse supernovae (SNe) affects the neutrino emission
characteristics. By comparing the neutrino properties of three
three-dimensional SN simulations of a 15 M_sun progenitor (one non-rotating
model and two models rotating at different velocities), we investigate how the
neutrino emission varies with the flow dynamics in the SN core depending on the
different degrees of rotation. The large-amplitude sinusoidal modulations due
to the standing accretion-shock instability (SASI) are weaker in both the
rotating models than in the non-rotating case. Moreover, the SN progenitor
rotation confines convection interior to the proto-neutron star (PNS) to a
radially narrow layer and suppresses a dipolar asymmetry of the PNS convection,
disfavoring the growth of hemispheric neutrino-emission asymmetries associated
with the lepton-emission self-sustained asymmetry (LESA). An investigation of
the multipole expansion of the neutrino luminosity and the electron neutrino
lepton number flux shows a dominant quadrupolar mode in rotating SN models. Our
findings highlight the power of using neutrinos as probes of SN hydrodynamics.
http://arxiv.org/icons/sfx.gif
