Probing mass-radius relation of protoneutron stars from gravitational-wave asteroseismology

Sotani, Hajime and Kuroda, Takami and Takiwaki, Tomoya and Kotake, Kei. (2017) Probing mass-radius relation of protoneutron stars from gravitational-wave asteroseismology. Physical Review D, 96 (6). 063005.

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Official URL: https://edoc.unibas.ch/59278/

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The gravitational-wave (GW) asteroseismology is a powerful technique for extracting interior information of compact objects. In this work, 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 study how to infer the properties of the PNS based on a quasi-normal mode analysis in the context of the GW asteroseismology. We find that the w1-mode frequency multiplied by the PNS radius is expressed as a linear function with respect to the ratio of the PNS mass to the PNS radius. This relation is insensitive to the nuclear equation of state (EOS) employed in this work. 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Kuroda, Takami
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Jan 2018 15:45
Deposited On:29 Jan 2018 15:45

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