Systematic bias due to nonspinning template waveforms in the gravitational wave parameter estimation for aligned-spin binary black holes

Cho, Hee-Suk

doi:10.3938/jkps.70.735

Cited by 4 publications

(3 citation statements)

References 45 publications

(45 reference statements)

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“…Our results suggest that such binaries are much more likely to be spin-aligned, leading to an incorrect inference of their stellar remnant properties if non-aligned templates are used (e.g. Cho 2017;Creswell et al 2018).…”

Section: Discussionmentioning

confidence: 91%

The alignment is in their stars: on the spin-alignment of stars in star clusters

Rey-Raposo

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2018

Monthly Notices of the Royal Astronomical Society: Letters

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We simulate star formation in two molecular clouds extracted from a larger disc-galaxy simulation with a spatial resolution of ∼ 0.1 pc, one exiting a spiral arm dominated by compression, and another in an inter-arm region more strongly affected by galactic shear. Treating the stars as 'sink particles', we track their birth angular momentum, and the later evolution of their angular momentum due to gas accretion. We find that in both clouds, the sinks have spin vectors that are aligned with one another, and with the global angular momentum vector of the star cluster. This alignment is present at birth, but enhanced by later gas accretion. In the compressive cloud, the sink-spins remain aligned with the gas for at least a free fall time. By contrast, in the shear cloud, the increased turbulent mixing causes the sinks to rapidly misalign with their birth cloud on approximately a gas free-fall time. In spite of this, both clouds show a strong alignment of sink-spins at the end of our simulations, independently of environment.

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Section: Discussionmentioning

confidence: 91%

The alignment is in their stars: on the spin-alignment of stars in star clusters

Rey-Raposo

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2018

Monthly Notices of the Royal Astronomical Society: Letters

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“…라이고 (Laser interferometer gravitational-wave observatory, LIGO) 는 중력파 GW150914 검출을 시작으로 두 블랙홀의 병합 과정에서 발생한 중력파를 다수 검출함으로 써 중력파천문학 분야의 개척을 주도하였다 [1][2][3][4][5][6][7][8][9][10][11][12]. 중력파 검출을 통하여, 기존의 전자기파로는 관측이 되지 않은, 새로운 질량 영역의 블랙홀의 존재가 확인됨으로써 중력파 천문학은 은하 및 별의 진화 연구에 새로운 활력소가 되고 있다.…”

Section: 다중신호천체물리 시대의 중성자별 연구unclassified

Gravitational Waves and Tidal Deformability of Neutron Stars

Kim¹,

Kwak²,

Lim³

et al. 2018

New Physics: Sae Mulli

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The gravitational waves (GW170817) produced during a binary neutron star inspiral, followed by a gamma-ray burst (GRB 170817A) and afterglows from X-ray to radio wavelength, were observed. By combining the distance obtained from gravitational waves with the red shift obtained from electromagnetic waves, even the Hubble constant was estimated. This indicates the start of new era of multimessenger astronomy. In addition to the masses of inspiralling neutron stars, the tidal deformability, which depends on the inner structures of neutron stars, has been estimated from gravitational waves. This confirms that even strong interactions can be tested by using gravitational waves. In this article, we review the effect of the tidal deformability of neutron stars on the gravitational waves produced during the inspiral process and discuss the implications of the detected tidal deformability for the neutron star's equations of state.

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“…The effects of waveform degeneracy have been studied before, particularly in the context of constructing a sufficiently large template bank for detection [3,[5][6][7][8]. In this paper, our focus is on the degeneracy of BBH waveforms with masses and spins appropriate for GW150914, using methods that compare the morphology of the waveforms themselves.…”

Section: Introductionmentioning

confidence: 99%

Degeneracy of gravitational waveforms in the context of GW150914

Creswell

Liu

Jackson

et al. 2018

J. Cosmol. Astropart. Phys.

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We study the degeneracy of theoretical gravitational waveforms for binary black hole mergers using an aligned-spin effective-one-body model. After appropriate truncation, bandpassing, and matching, we identify regions in the mass-spin parameter space containing waveforms similar to the template proposed for GW150914, with masses m 1 = 36 +5 −4 M and m 2 = 29 +4 −4 M , using the cross-correlation coefficient as a measure of the similarity between waveforms. Remarkably high cross-correlations are found across broad regions of parameter space. The associated uncertanties exceed these from LIGO's Bayesian analysis considerably. We have shown that waveforms with greatly increased masses, such as m 1 = 70M and m 2 = 35M , and strong anti-aligned spins (χ 1 = 0.95 and χ 2 = −0.95) yield almost the same signal-to-noise ratio in the strain data for GW150914.

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Systematic bias due to nonspinning template waveforms in the gravitational wave parameter estimation for aligned-spin binary black holes

Cited by 4 publications

References 45 publications

The alignment is in their stars: on the spin-alignment of stars in star clusters

The alignment is in their stars: on the spin-alignment of stars in star clusters

Gravitational Waves and Tidal Deformability of Neutron Stars

Degeneracy of gravitational waveforms in the context of GW150914

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