Identifying rotation in SASI-dominated core-collapse supernovae with a neutrino gyroscope

Laurie Walk, Irene Tamborra, Hans-Thomas Janka, and Alexander Summa
Phys. Rev. D 98, 123001 – Published 5 December 2018
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Abstract

Measuring the rotation of core-collapse supernovae (SN) and of their progenitor stars is extremely challenging. Here, it is demonstrated that neutrinos may potentially be employed as stellar gyroscopes, if phases of activity by the standing accretion-shock instability (SASI) affect the neutrino emission prior to the onset of the SN explosion. This is shown by comparing the neutrino emission properties of self-consistent, three-dimensional SN simulations of a 15M progenitor without rotation as well as slow and fast rotation compatible with observational constraints. The explosion of the fast rotating model gives rise to long-lasting, massive polar accretion downflows with stochastic time variability, detectable, e.g., by the IceCube Neutrino Observatory for any observer direction. While spectrograms of the neutrino event rate of nonrotating SNe feature a well-known sharp peak due to SASI for observers located in the proximity of the SASI plane, the corresponding spectrograms of rotating models show activity over a wide range of frequencies, most notably above 200 Hz for rapid rotation. In addition, the Fourier power spectra of the event rate for rotating models exhibit a SASI peak with lower power than in nonrotating models. The spectra for the rotating models also show secondary peaks at higher frequencies with greater relative heights compared to the main SASI peak than for nonrotating cases. These rotational imprints will be detectable for SNe at 10 kpc or closer.

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  • Received 6 July 2018

DOI:https://doi.org/10.1103/PhysRevD.98.123001

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Laurie Walk and Irene Tamborra

  • Niels Bohr International Academy and DARK, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark

Hans-Thomas Janka and Alexander Summa

  • Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany

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Issue

Vol. 98, Iss. 12 — 15 December 2018

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