Exploring the Impact of Ejecta Velocity Profile on Kilonova Evolution: Diversity of the Kilonova Lightcurves
arXiv:2310.15608 · doi:10.3847/1538-4357/ad06b0
Abstract
A kilonova is a short-lived explosive event in the universe, resulting from the merger of two compact objects. Despite its importance as a primary source of heavy elements through r-process nucleosynthesis, its nature is not well understood, due to its rarity. In this work, we introduce a model that determines the density of a radially-stratified relativistic ejecta. We apply the model to kilonova ejecta and explore several hypothesized velocity profiles as a function of the merger's ejection time. These velocity profiles result in diverse density profiles of the ejecta, for which we conduct radiative transfer simulations using TARDIS with the solar r-process composition. Consequently, we investigate the impact of the ejecta velocity profile on the resulting lightcurve and spectral evolution through the line transitions of heavy elements. The change in the rate at which these elements accumulate in the line-forming region leaves its imprint on the kilonova lightcurve at specific wavelengths, causing the lightcurves to decay at different rates. Furthermore, in several profiles, plateau-like behaviors (slow and/or flat decline) are also observed. In conclusion, this work proposes potential scenarios of the kilonova evolution due to the ejecta velocity profile.
arXiv comment9 pages, 5 figures
References in corpus (40)
- Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
- A kilonova as the electromagnetic counterpart to a gravitational-wave source
- The Combined Ultraviolet, Optical, and Near-Infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
- Opacities and Spectra of the r-process Ejecta from Neutron Star Mergers
- The mass ejection from the merger of binary neutron stars
- Identification of strontium in the merger of two neutron stars
- Radiative Transfer Simulations for Neutron Star Merger Ejecta
- Kilonovae
- Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis
- CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
- Kilonova from post-merger ejecta as an optical and near-infrared counterpart of GW170817
- Three-dimensional GRMHD simulations of the remnant accretion disks from neutron star mergers: outflows and r-process nucleosynthesis
- Radiation hydrodynamics of SN 1987A: I. Global analysis of the light curve for the first 4 months
- AT2017gfo: an anisotropic and three-component kilonova counterpart of GW170817
- POSSIS: predicting spectra, light curves and polarization for multi-dimensional models of supernovae and kilonovae
- Dynamical mass ejection from black hole-neutron star binaries
- A spectral synthesis code for rapid modelling of supernovae
- Estimates for Disk and Ejecta Masses Produced in Compact Binary Mergers
- Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components
- Monte Carlo transition probabilities
- Monte Carlo transition probabilities. II
- Axisymmetric Radiative Transfer Models of Kilonovae
- Quantitative spectroscopic analysis of and distance to SN1999em
- AT2017gfo: Bayesian inference and model selection of multi-component kilonovae and constraints on the neutron star equation of state
- Modelling the spectra of the kilonova AT2017gfo -- I: The photospheric epochs
- Signatures of r-process elements in kilonova spectra
- Kilonova Detectability with Wide-Field Instruments
- Inclination Dependence of Kilonova Light Curves from Globally Aspherical Geometries
- Spectral modeling of type II supernovae. I. Dilution factors
- A semi-analytical light curve model and its application to type IIP supernovae
- Constraints on the presence of platinum and gold in the spectra of the kilonova AT2017gfo
- Comparing inclination dependent analyses of kilonova transients
- Mapping dynamical ejecta and disk masses from numerical relativity simulations of neutron star mergers
- LSST Target-of-Opportunity Observations of Gravitational Wave Events: Essential and Efficient
- A Semi-analytic Formulation for Relativistic Blast Waves with a Long-lived Reverse Shock
- Modelling Type Ic Supernovae with TARDIS: Hidden Helium in SN1994I?
- The Continuing Story of SN IIb 2013df: New Optical and IR Observations and Analysis
- Constraint on the ejecta mass for a black hole-neutron star merger event candidate S190814bv
- Nucleosynthesis in outflows of compact objects and detection prospects of associated kilonovae
- SN 2017hpa: A carbon-rich type Ia supernova