MG15 - Talk detail

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Abstract

The gravitational-wave asteroseismology is a powerful technique for extracting interior information of compact objects. We focus on spacetime modes, the so-called w modes, of GWs emitted from a proto-neutron star (PNS) in the postbounce phase of core-collapse supernovae. Using results from recent three-dimensional supernova models, we find that the w1-mode frequency multiplied by the PNS radius is expressed as a linear function with respect to the compactness of the PNS insensitively to the nuclear equation of state. Combining with another universal relation of the f-mode oscillations, we point out that the time dependent mass-radius relation of the PNS can be obtained by observing both the f- and w1-mode GWs simultaneously. Our results suggest that the simultaneous detection of the two modes could provide a new probe into finite-temperature nuclear EOS that predominantly determines the PNS evolution.

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Session

Accepted

Yes

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Time

Talk

Title

Abstract

We consider crustal torsional oscillations, taking into account the effect of the pasta structure. We find from eigenmode analyses for various models of the equation of state of uniform nuclear matter that the fundamental frequencies of such oscillations are almost independent of the incompressibility of symmetric nuclear matter K0, but strongly depend on the slope parameter of the nuclear symmetry energy L. On the other hand, we also find that the frequencies of the 1st overtone depend strongly on not only L but also K0. By comparing the resultant oscillations to the frequencies of quasi-periodic oscillations, we can constraint on the values of L and K0. Furthermore, considering the constraints on K0 obtained from the terrestrial nuclear experiments, we can successfully make a more severe constant on L.

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