Modeling the emission lines from r-process elements in Supernova nebulae

Abstract

The origin of heavy r-process elements in the universe is still a matter of great debate, with a confirmed scenario being neutron star (NS) mergers. Additional relevant sites could be specific classes of events, such as gamma-ray burst (GRB) Supernovae (SNe), where a central engine could push neutron-rich material outwards, contributing to the ejecta of the massive exploding star. Here, we investigate our ability to infer the production of heavy elements in such scenarios, on the basis of the observed nebular emission. We solve the steady-state ionization, level population, and thermal balance, for optically thin ejecta in non-local thermodynamic equilibrium (NLTE), in order to explore the role of heavy elements in cooling the gas, and their imprint in the emergent spectrum a few hundreds days post-explosion. We find that heavy elements would be relevant in the cooling process of the nebula only if they account for at least $\sim 1\%$ of the total ejected mass, at the typical kinetic temperatures of a few thousands K. However, even in the absence of such amount, a few $0.1\%$ of the total ejected mass could be instead sufficient to leave a detectable imprint around $\sim 1-10\mu \mathrm{m}$. This wavelength range, which would be relatively clean from features due to light elements, would be instead robustly populated by lines from heavy elements arising from forbidden transitions in their atomic fine structures. Hence, the new generation of telescopes, represented by the James Webb Space Telescope (JWST), will most likely allow for their detection.

References in corpus (86)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Modules for Experiments in Stellar Astrophysics (MESA)
• Multi-messenger Observations of a Binary Neutron Star Merger
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Electromagnetic Counterparts of Compact Object Mergers Powered by the Radioactive Decay of R-process Nuclei
• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• The Proto-Magnetar Model for Gamma-Ray Bursts
• Effect of a High Opacity on the Light Curves of Radioactively Powered Transients from Compact Object Mergers
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• Identification of strontium in the merger of two neutron stars
• Radiative Transfer Simulations for Neutron Star Merger Ejecta
• Kilonovae
• R-process enrichment from a single event in an ancient dwarf galaxy
• Collapsars as a major source of r-process elements
• CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
• A Kilonova Following a Long-Duration Gamma-Ray Burst at 350 Mpc
• Radioactivity and thermalization in the ejecta of compact object mergers and their impact on kilonova light curves
• A neutron-star-driven X-ray flash associated with supernova SN 2006aj
• Neutron Star Mergers Might not be the Only Source of r-Process Elements in the Milky Way
• JWST detection of heavy neutron capture elements in a compact object merger
• Core-collapse explosions of Wolf-Rayet stars and the connection to type IIb/Ib/Ic supernovae
• Radiative recombination data for modelling dynamic finite-density plasmas
• Neutrino-Dominated Accretion and Supernovae
• The Spectral SN-GRB Connection: Systematic Spectral Comparisons between Type Ic Supernovae, and broad-lined Type Ic Supernovae with and without Gamma-Ray Bursts
• Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex
• Nucleosynthesis in the Outflow from Gamma Ray Burst Accretion Disks
• Neutron Star Mergers as sites of r-process Nucleosynthesis and Short Gamma-Ray Bursts
• A Two-Component Model for the Light Curves of Hypernovae
• R-process Nucleosynthesis from Three-Dimensional Magnetorotational Core-Collapse Supernovae
• Time Dependent Radiative Transfer Calculations for Supernovae
• r-Process Nucleosynthesis: Connecting Rare-Isotope Beam Facilities with the Cosmos
• New limit of ${}^{244}$Pu on Earth points to rarity of actinide nucleosynthesis
• The different progenitors of type Ib, Ic SNe, and of GRB
• Extensive optical and near-infrared observations of the nearby, narrow-lined type Ic SN 2007gr: days 5 to 415
• Analyzing the Largest Spectroscopic Dataset of Stripped Supernovae to Improve Their Identifications and Constrain Their Progenitors
• Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components
• Short-lived ${}^{244}$Pu Points to Compact Binary Mergers as Sites for Heavy r-process Nucleosynthesis
• Relativistic Jets and Long-Duration Gamma-ray Bursts from the Birth of Magnetars
• R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae
• Nucleosynthesis in Gamma Ray Burst Accretion Disks
• The Ultimate Light Curve of SN 1998bw/GRB 980425
• Radioactive heating rate of r-process elements and macronova light curve
• Modelling the spectra of the kilonova AT2017gfo -- I: The photospheric epochs
• Full Transport General Relativistic Radiation Magnetohydrodynamics for Nucleosynthesis in Collapsars
• A GRB and Broad-lined Type Ic Supernova from a Single Central Engine
• Signatures of r-process elements in kilonova spectra
• Production of very light elements and strontium in the early ejecta of neutron star mergers
• Can neutron star mergers alone explain the r-process enrichment of the Milky Way?
• NLTE Effects on Kilonova Expansion Opacities
• Post-outburst spectra of a stellar-merger remnant of V1309 Scorpii: from a twin of V838 Monocerotis to a clone of V4332 Sagittarii
• Nebular Emission from Lanthanide-rich Ejecta of Neutron Star Merger
• Atomic data from the Iron Project. LXIV. Radiative transition rates and collision strengths for Ca II
• On the Validity of Steady-State for Nebular Phase Kilonovae
• Radiative-transfer models for explosions from rotating and non-rotating single WC stars. Implications for SN1998bw and LGRB/SNe
• A Stringent Limit on the Mass Production Rate of $r$-Process Elements in the Milky Way
• R-process viable outflows are suppressed in global alpha-viscosity models of collapsar disks
• Shock-heating of stellar envelopes: A possible common mechanism at the origin of explosions and eruptions in massive stars
• Discovery of a 760 nm P Cygni line in AT2017gfo: Identification of yttrium in the kilonova photosphere
• NLTE Spectra of Kilonovae
• The $\gamma$-ray deposition histories of core-collapse supernovae
• Spectroscopy of the Type Ic Supernova SN\,2017iuk Associated with Low-redshift GRB\,171205A
• "Super-Kilonovae" from Massive Collapsars as Signatures of Black-Hole Birth in the Pair-instability Mass Gap
• Signatures of R-process Enrichment in Supernovae from Collapsars
• Tungsten vs Selenium as a potential source of kilonova nebular emission observed by Spitzer
• Neutron-Capture elements in planetary nebulae: first detections of near-Infrared [Te III] and [Br V] emission lines
• $r$-process nucleosynthesis from compact binary mergers
• Collapsars as Sites of r-process Nucleosynthesis: Systematic Near-Infrared Follow-up of Type Ic-BL Supernovae
• Nebular spectra from Type Ia supernova explosion models compared to JWST observations of SN 2021aefx
• Predicted rates of merging neutron stars in galaxies
• The Stars in M15 Were Born with the r-process
• Emergence hour-by-hour of $r$-process features in the kilonova AT2017gfo
• Non-LTE analysis for Helium and Strontium lines in the kilonova AT2017gfo
• Collision strengths and transition probabilities for Co II infrared forbidden lines
• Cerium features in kilonova near-infrared spectra: implication from a chemically peculiar star
• Actinide signatures in low electron fraction kilonova ejecta
• Collision strengths and transition probabilities for Co III forbidden lines
• New Radiative and Collisional Atomic Data for Sr {\sc ii} and Y {\sc ii} with application to Kilonova modelling
• Hydrodynamic mixing of accretion disk outflows in collapsars: implications for r-process signatures
• The thermalization of $\gamma$-rays in radioactive expanding ejecta: A simple model and its application for Kilonovae and Ia SNe
• R-matrix electron-impact excitation data for the N-like iso-electronic sequence
• Effective collision strengths between Mg I and electrons
• The carbon-rich type Ic supernova 2016adj in the iconic dust lane of Centaurus A: signatures of interaction with circumstellar hydrogen?
• Helium features are inconsistent with the spectral evolution of the kilonova AT2017gfo
• Unveiling the nature of SN 2022jli: The first double-peaked stripped-envelope supernova showing periodic undulations and dust emission at late times
• Nebular spectra of kilonovae with detailed recombination rates -- I. Light r-process composition