GRB 180325A: dust grain-size distribution and interstellar iron nanoparticles contribution

Abstract

We modelled dust grain-size distributions for carbonaceous and silicates dust, as well as for free-flying iron nanoparticles in the environment of a $\gamma$-ray burst (GRB) afterglow, GRB 180325A. This GRB, at $z=2.2486$, has an unambiguous detection of the 2175 Å extinction feature with $R_V=4.58$ and $A_V=1.58$. In addition to silicates, polycyclic aromatic hydrocarbons (PAH), and graphite, we used iron nanoparticles grain-size distributions for the first time to model the observed extinction curve of GRB 180325A. We fit the observed extinction for four model permutations, using 232 sets of silicates, graphite, carbon abundance in hydrocarbon molecules ($b_C$), and fraction of iron abundance in free-flying nanoparticles ($b_{\text{Fe}}$). These four different permutations were chosen to test iron nanoparticles significance and carbon abundance in hydrocarbons. Our results indicate that iron nanoparticles contribution is insignificant and there is a degeneracy of carbon abundances, with the range $(0.0\le b_C\le 0.7)\times 10^{-5}$ providing the best-fit to the observed extinction curve of GRB 180325A. We therefore favour the simplest model of silicates and polycyclic aromatic hydrocarbons. The silicates are dominant and contribute to the entire wavelength range of the GRB extinction curve while graphite contributes towards both the 2175 Å bump and the UV extinction. The afterglow peak luminosity ($1.5\times 10^{51}$ ergs/s) indicates dust destruction may have taken place. We conclude that further investigations into other potential contributors of extinction are warranted, particularly for steep UV extinction.

arXiv comment13 pages, 7 figures, accepted for publication in MNRAS

References in corpus (46)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The chemical composition of the Sun
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• Interstellar Dust Grains
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Dust Formation in Primordial Type II Supernovae
• The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
• The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
• Dust sublimation by GRBs and its implications
• The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
• Dust Formation In Early Galaxies
• Signatures of Extragalactic Dust in pre-Swift GRB Afterglows
• Stellar sources of dust in the high redshift Universe
• The HDUV Survey: A Revised Assessment of the Relationship between UV Slope and Dust Attenuation for High-Redshift Galaxies
• The First Positive Detection of Molecular Gas in a GRB Host Galaxy
• X-ray Destruction of Dust Along the Line of Sight to Gamma-Ray Bursts
• Magnetic Nanoparticles in the Interstellar Medium: Emission Spectrum and Polarization
• Modelling Dust Evolution in Galaxies with a Multiphase, Inhomogeneous ISM
• The first low-mass stars: critical metallicity or dust-to-gas ratio?
• Dust Grain-Size Distributions From MRN to MEM
• Dust in the diffuse interstellar medium: Extinction, emission, linear and circular polarisation
• Time-Dependent Photoionization in a Dusty Medium II: Evolution of Dust Distributions and Optical Opacities
• Gamma-Ray Burst in a Molecular Cloud: Destruction of Dust and H2, and Emergent Spectrum
• Iron: A Key Element for Understanding the Origin and Evolution of Interstellar Dust
• A hidden reservoir of Fe/FeS in interstellar silicates?
• The properties of the 2175AA extinction feature discovered in GRB afterglows
• Monster in the Dark: The Ultraluminous GRB 080607 and its Dusty Environment
• Extinction curves expected in young galaxies
• Polarization of Magnetic Dipole Emission and Spinning Dust Emission from Magnetic Nanoparticles
• The Composition of Interstellar Grains Toward Zeta Ophiuchi: Constraining the Elemental Budget Near the Diffuse-Dense Cloud Transition
• Evidence for Dust Destruction from the Early-time Colour Change of GRB 120119A
• The Mid-Infrared Extinction Law in the Large Magellanic Cloud
• The Dust Attenuation Curve versus Stellar Mass for Emission Line Galaxies at z ~ 2
• The Discovery of Vibrationally-Excited H_2 in the Molecular Cloud near GRB 080607
• A new galactic chemical evolution model with dust: results for dwarf irregular galaxies and DLA systems
• Thermodynamics and Charging of Interstellar Iron Nanoparticles
• X-shooting GRBs at high redshift: probing dust production history
• Evolution of dust grain size distribution by shattering in the interstellar medium: robustness and uncertainty
• The 2175 Å extinction feature in the optical afterglow spectrum of GRB 180325A at z=2.25
• The visibility of gamma-ray burst afterglows in dusty star-forming regions
• Toward understanding physical origin of 2175Å extinction bump in interstellar medium
• Missing Fe: hydrogenated iron nanoparticles
• Modelling the prompt optical emission of GRB 180325A: the evolution of a spike from the optical to gamma-rays
• On the dust properties of high redshift molecular clouds and the connection to the 2175 Å extinction bump
• Silicon and iron dust in gamma-ray burst host galaxy absorbers

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