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Title: Toward Rapid Transient Identification and Characterization of Kilonovae

Abstract

With the mounting sensitivity of advanced gravitational-wave (GW) detectors, the first joint detection of an electromagnetic and GW signal from a compact binary merger will hopefully happen within this decade. Yet, current GW likelihood sky areas span $$\sim 100\mbox{--}1000\,{\deg }^{2}$$, and thus it is a challenging task to identify which, if any, transient corresponds to the GW event. In this study, we make a comparison between recent kilonova/macronova light-curve models for the purpose of assessing potential light-curve templates for counterpart identification. We show that recent analytical and parameterized models for these counterparts result in qualitative agreement with more complicated radiative transfer simulations. Our analysis suggests that with improved light-curve models with smaller uncertainties it will become possible to extract information about ejecta properties and binary parameters directly from the light-curve measurement. Even tighter constraints are obtained in cases for which GW and kilonova parameter estimation results are combined. It will therefore be critical to make comparisons and potentially combine parameter estimation with the kilonova and GW results. However, to be prepared for upcoming detections, more realistic kilonova models are needed. These will require numerical relativity with more detailed microphysics, better radiative transfer simulations, and a better understanding of the underlying nuclear physics.

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [1];  [4]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Max Planck Inst. for Gravitational Physics, Golm (Germany)
  3. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
  4. Federal Univ. of ABC Santo Andre, Sao Paulo (Brazil)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1527166
Grant/Contract Number:  
SC0007881
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 849; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gravitational waves; stars: neutron; surveys

Citation Formats

Coughlin, Michael, Dietrich, Tim, Kawaguchi, Kyohei, Smartt, Stephen, Stubbs, Christopher, and Ujevic, Maximiliano. Toward Rapid Transient Identification and Characterization of Kilonovae. United States: N. p., 2017. Web. doi:10.3847/1538-4357/aa9114.
Coughlin, Michael, Dietrich, Tim, Kawaguchi, Kyohei, Smartt, Stephen, Stubbs, Christopher, & Ujevic, Maximiliano. Toward Rapid Transient Identification and Characterization of Kilonovae. United States. https://doi.org/10.3847/1538-4357/aa9114
Coughlin, Michael, Dietrich, Tim, Kawaguchi, Kyohei, Smartt, Stephen, Stubbs, Christopher, and Ujevic, Maximiliano. Wed . "Toward Rapid Transient Identification and Characterization of Kilonovae". United States. https://doi.org/10.3847/1538-4357/aa9114. https://www.osti.gov/servlets/purl/1527166.
@article{osti_1527166,
title = {Toward Rapid Transient Identification and Characterization of Kilonovae},
author = {Coughlin, Michael and Dietrich, Tim and Kawaguchi, Kyohei and Smartt, Stephen and Stubbs, Christopher and Ujevic, Maximiliano},
abstractNote = {With the mounting sensitivity of advanced gravitational-wave (GW) detectors, the first joint detection of an electromagnetic and GW signal from a compact binary merger will hopefully happen within this decade. Yet, current GW likelihood sky areas span $\sim 100\mbox{--}1000\,{\deg }^{2}$, and thus it is a challenging task to identify which, if any, transient corresponds to the GW event. In this study, we make a comparison between recent kilonova/macronova light-curve models for the purpose of assessing potential light-curve templates for counterpart identification. We show that recent analytical and parameterized models for these counterparts result in qualitative agreement with more complicated radiative transfer simulations. Our analysis suggests that with improved light-curve models with smaller uncertainties it will become possible to extract information about ejecta properties and binary parameters directly from the light-curve measurement. Even tighter constraints are obtained in cases for which GW and kilonova parameter estimation results are combined. It will therefore be critical to make comparisons and potentially combine parameter estimation with the kilonova and GW results. However, to be prepared for upcoming detections, more realistic kilonova models are needed. These will require numerical relativity with more detailed microphysics, better radiative transfer simulations, and a better understanding of the underlying nuclear physics.},
doi = {10.3847/1538-4357/aa9114},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 849,
place = {United States},
year = {2017},
month = {10}
}

Journal Article:
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Cited by: 23 works
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Figures / Tables:

Figure 1 Figure 1: Bolometric luminosity (left) and light curves in the g (dashed) and i (solid) bands (right). The parameterized models of Kawaguchi et al. (2016) and Dietrich & Ujevic (2017) use Mej ≈ 5 × 10–3, $ν$ej ≈ 0.2, and $ θ $ = 0.2 rad. Barnes et al. (2016)more » use a model with Mej ≈ 5 × 10–3 and $ν$ej ≈ 0.2. We use the fiducial model of Metzger et al. (2015), which uses a neutron mass cut mn = 10–4, opacity of $κ$ = 30 cm2 g–1 , and electron fraction Ye = 0.05. From Rosswog et al. (2017), we include a model with Mej = 0.0079 and $ν$ej = 0.12, which is the closest available to our fiducial model.« less

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