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Polarized kilonovae...
Polarized kilonovae from black hole-neutron star mergers
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- Bulla, Mattia (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita)
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- Kyutoku, K. (författare)
- Kyoto Univ, Dept Phys, Kyoto 6068502, Japan.;Kyoto Univ, Ctr Gravitat Phys, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan.;RIKEN, Interdisciplinary Theoret & Math Sci Program iTHE, Wako, Saitama 3510198, Japan.,Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.;Univ Leicester, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England.
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- Tanaka, M. (författare)
- Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan.,Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel.;Univ Tokyo, Res Ctr Early Universe, Grad Sch Sci, Tokyo 1130033, Japan.;Univ Tokyo, Grad Sch Sci, Dept Phys, Tokyo 1130033, Japan.
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- Covino, S. (författare)
- Ist Nazl Astrofis, Brera Astron Observ, Via Bianchi 46, I-23807 Merate, LC, Italy.
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- Bruten, J. R. (författare)
- Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England.
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- Matsumoto, T. (författare)
- Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel.;Univ Tokyo, Res Ctr Early Universe, Grad Sch Sci, Tokyo 1130033, Japan.;Univ Tokyo, Grad Sch Sci, Dept Phys, Tokyo 1130033, Japan.
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- Maund, J. R. (författare)
- Univ Sheffield, Dept Phys & Astron, Hicks Bldg,Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England.
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- Testa, V (författare)
- Ist Nazl Astrofis, Osservatorio Astron Roma, I-00078 Monte Porzio Catone, Italy.
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- Wiersema, K. (författare)
- Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.;Univ Leicester, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England.
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(creator_code:org_t)
- 2020-12-10
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 501:2, s. 1891-1899
- Relaterad länk:
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We predict linear polarization for a radioactively powered kilonova following the merger of a black hole and a neutron star. Specifically, we perform 3D Monte Carlo radiative transfer simulations for two different models, both featuring a lanthanide-rich dynamical ejecta component from numerical-relativity simulations while only one including an additional lanthanide-free disc-wind component. We calculate polarization spectra for nine different orientations at 1.5, 2.5, and 3.5 d after the merger and in the 0.1-2 mu m wavelength range. We find that both models are polarized at a detectable level 1.5 d after the merger while show negligible levels thereafter. The polarization spectra of the two models are significantly different. The model lacking a disc wind shows no polarization in the optical, while a signal increasing at longer wavelengths and reaching similar to 1-6 per cent at 2 mu m depending on the orientation. The model with a disc-wind component, instead, features a characteristic 'double-peak' polarization spectrum with one peak in the optical and the other in the infrared. Polarimetric observations of future events will shed light on the debated neutron richness of the disc-wind component. The detection of optical polarization would unambiguously reveal the presence of a lanthanide-free disc-wind component, while polarization increasing from zero in the optical to a peak in the infrared would suggest a lanthanide-rich composition for the whole ejecta. Future polarimetric campaigns should prioritize observations in the first similar to 48 h and in the 0.5-2 mu m range, where polarization is strongest, but also explore shorter wavelengths/later times where no signal is expected from the kilonova and the interstellar polarization can be safely estimated.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- gravitational waves
- opacity
- radiative transfer
- methods: numerical
- polarization
- transients: black hole
- neutron star mergers
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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