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Comparing inclinati...
Comparing inclination-dependent analyses of kilonova transients
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- Heinzel, J. (author)
- Carleton Coll, Northfield, MN 55057 USA.;Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA.
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- Coughlin, M. W. (author)
- Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA.
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- Dietrich, T. (author)
- Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.
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- Bulla, Mattia (author)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),NORDITA SU
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- Antier, S. (author)
- APC, UMR 7164, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris, France.
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- Christensen, N. (author)
- Carleton Coll, Northfield, MN 55057 USA.;Univ Cote Azur, Observ Cote Azur, CNRS, Artemis, CS 34229, F-06304 Nice 4, France.
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- Coulter, D. A. (author)
- Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA.
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- Foley, R. J. (author)
- Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA.
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- Issa, Lina (author)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Université Paris-Saclay, France,NORDITA SU
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- Khetan, N. (author)
- Gran Sasso Sci Inst GSSI, I-67100 Laquila, Italy.
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Carleton Coll, Northfield, MN 55057 USA;Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. (creator_code:org_t)
- 2021-01-28
- 2021
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 502:2, s. 3057-3065
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Abstract
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- The detection of the optical transient AT2017gfo proved that binary neutron star mergers are progenitors of kilonovae (KNe). Using a combination of numerical-relativity and radiative-transfer simulations, the community has developed sophisticated models for these transients for a wide portion of the expected parameter space. Using these simulations and surrogate models made from them, it has been possible to perform Bayesian inference of the observed signals to infer properties of the ejected matter. It has been pointed out that combining inclination constraints derived from the KN with gravitational-wave measurements increases the accuracy with which binary parameters can be estimated, in particular breaking the distance-inclination degeneracy from gravitational wave inference. To avoid bias from the unknown ejecta geometry, constraints on the inclination angle for AT2017gfo should be insensitive to the employed models. In this work, we compare different assumptions about the ejecta and radiative reprocesses used by the community and we investigate their impact on the parameter inference. While most inferred parameters agree, we find disagreement between posteriors for the inclination angle for different geometries that have been used in the current literature. According to our study, the inclusion of reprocessing of the photons between different ejecta types improves the modeling fits to AT2017gfo and, in some cases, affects the inferred constraints. Our study motivates the inclusion of large similar to 1-mag uncertainties in the KN models employed for Bayesian analysis to capture yet unknown systematics, especially when inferring inclination angles, although smaller uncertainties seem appropriate to capture model systematics for other intrinsic parameters. We can use this method to impose soft constraints on the ejecta geometry of the KN AT2017gfo.
Subject headings
- 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)
Keyword
- gravitational waves
- neutron star mergers
- radiative transfer
- methods: numerical
- stars: neutron
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Heinzel, J.
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Coughlin, M. W.
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Dietrich, T.
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Bulla, Mattia
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Antier, S.
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Christensen, N.
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show more...
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Coulter, D. A.
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Foley, R. J.
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Issa, Lina
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Khetan, N.
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