Hiroki Nagakura

The sensitivity of presupernova neutrinos to stellar evolution models

Publisher: Oxford University Press (OUP)

Date: 20-06-2020

DOI: 10.1093/MNRAS/STAA1738

Abstract: We examine the sensitivity of neutrino emission to stellar evolution models for a 15 M⊙ progenitor, paying particular attention to a phase prior to the collapse. We demonstrate that the number luminosities in both electron-type neutrinos (νe) and their antipartners ($\\bar{\\nu }_\\mathrm{ e}$) differ by more than an order of magnitude by changing spatial resolutions and nuclear network sizes on stellar evolution models. We also develop a phenomenological model to capture the essential trend of the ersity, in which neutrino luminosities are expressed as a function of central density, temperature, and electron fraction. In the analysis, we show that the neutrino luminosity can be well characterized by these central quantities. This analysis also reveals that the most influential quantity to the time evolution of νe luminosity is matter density, while it is temperature for $\\bar{\\nu }_\\mathrm{ e}$. These qualitative trends will be useful and applicable to constrain the physical states of progenitors at the final stages of stellar evolution from future neutrino observations, although more detailed systematic studies including various mass progenitors are required to assess the applicability.

Hyperbolic self-gravity solver for large scale hydrodynamical simulations

Publisher: American Physical Society (APS)

Date: 12-04-2016

DOI: 10.1103/PHYSREVD.93.083006

National Astronomical Observatory Of Japan

Location: Japan

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自然科学研究機構国立天文台/National Astronomical Observatory Of Japan

Location: Japan

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Waseda University

Location: Japan

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Princeton University

Location: United States of America

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