Gravitational-wave asteroseismology with fundamental modes from compact binary inspirals
| Autor: | Pratten, Geraint, Schmidt, Patricia, Hinderer, Tanja, Sub String Theory Cosmology and ElemPart, Theoretical Physics |
|---|---|
| Přispěvatelé: | Sub String Theory Cosmology and ElemPart, Theoretical Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Equation of state
General relativity Science General Physics and Astronomy FOS: Physical sciences Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Asteroseismology Article General Biochemistry Genetics and Molecular Biology General Relativity and Quantum Cosmology 0103 physical sciences 010306 general physics lcsh:Science Physics High Energy Astrophysical Phenomena (astro-ph.HE) Multidisciplinary 010308 nuclear & particles physics Gravitational wave Oscillation Computer Science::Information Retrieval Exotic matter General Chemistry Nuclear matter General relativity and gravity High-energy astrophysics Neutron star lcsh:Q Astrophysics::Earth and Planetary Astrophysics Compact astrophysical objects Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-7 (2020) Nature Communications, 11(1), 1. Nature Publishing Group Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-020-15984-5 |
| Popis: | The first detection of gravitational waves (GWs) from the binary neutron star (NS) inspiral GW170817 has opened a unique channel for probing the fundamental properties of matter at supra-nuclear densities inaccessible elsewhere in the Universe. This observation yielded the first constraints on the equation of state (EoS) of NS matter from the GW imprint of tidal interactions. Tidal signatures in the GW arise from the response of a matter object to the spacetime curvature sourced by its binary companion. They crucially depend on the EoS and are predominantly characterised by the tidal deformability parameters $\Lambda_{\ell}$, where $\ell=2,3$ denotes the quadrupole and octupole respectively. As the binary evolves towards merger, additional dynamical tidal effects become important when the orbital frequency approaches a resonance with the stars' internal oscillation modes. Among these modes, the fundamental ($f_\ell$-)modes have the strongest tidal coupling and can give rise to a cumulative imprint in the GW signal even if the resonance is not fully excited. Here we present the first direct constraints on fundamental oscillation mode frequencies for GW170817 using an inspiral GW phase model with an explicit dependence on the $f$-mode frequency and without assuming any relation between $f_\ell$ and $\Lambda_\ell$. We rule out anomalously small values of $f_\ell$ and, for the larger companion, determine a lower bound on the $f_2$-mode ($f_3$-mode) frequency of $\geq 1.39$ kHz ($\geq 1.86$ kHz) at the 90\% credible interval (CI). We then show that networks of future GW detectors will be able to measure $f$-mode frequencies to within tens of Hz from the inspiral alone. Such precision astroseismology will enable novel tests of fundamental physics and the nature of compact binaries. Comment: 8 pages, 5 figures |
| Databáze: | OpenAIRE |
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