M. Kromer
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View article: Non-LTE radiative transfer simulations: improved agreement of the double detonation with normal Type Ia supernovae
Non-LTE radiative transfer simulations: improved agreement of the double detonation with normal Type Ia supernovae Open
The double detonation is a widely discussed explosion mechanism for Type Ia supernovae, whereby a helium shell detonation ignites a secondary detonation in the carbon/oxygen core of a white dwarf. Even for modern models that invoke relativ…
View article: Non-LTE radiative transfer simulations: Improved agreement of the double detonation with normal Type Ia supernovae
Non-LTE radiative transfer simulations: Improved agreement of the double detonation with normal Type Ia supernovae Open
The double detonation is a widely discussed explosion mechanism for Type Ia supernovae, whereby a helium shell detonation ignites a secondary detonation in the carbon/oxygen core of a white dwarf. Even for modern models that invoke relativ…
View article: Including a luminous central remnant in radiative transfer simulations for Type Iax supernovae
Including a luminous central remnant in radiative transfer simulations for Type Iax supernovae Open
Type Iax supernovae (SNe Iax) are proposed to arise from deflagrations of Chandrasekhar mass white dwarfs (WDs). Previous deflagration simulations have achieved good agreement with the light curves and spectra of intermediate-luminosity an…
View article: Helium as a signature of the double detonation in Type Ia supernovae
Helium as a signature of the double detonation in Type Ia supernovae Open
The double detonation is a widely discussed mechanism to explain Type Ia supernovae from explosions of sub-Chandrasekhar mass white dwarfs. In this scenario, a helium detonation is ignited in a surface helium shell on a carbon/oxygen white…
View article: Helium as a signature of the double detonation in Type Ia supernovae
Helium as a signature of the double detonation in Type Ia supernovae Open
The double detonation is a widely discussed mechanism to explain Type Ia supernovae from explosions of sub-Chandrasekhar mass white dwarfs. In this scenario, a helium detonation is ignited in a surface helium shell on a carbon/oxygen white…
View article: Kilonova emission from realistic neutron star merger simulations
Kilonova emission from realistic neutron star merger simulations Open
The detection of GW170817 and its electromagnetic counterpart AT2017gfo confirmed the expectation that a kilonova would accompany the merging of binary neutron stars, and subsequently there has been much interest in simulating kilonova emi…
View article: 3D radiative transfer kilonova modelling for binary neutron star merger simulations
3D radiative transfer kilonova modelling for binary neutron star merger simulations Open
The detection of GW170817 and the accompanying electromagnetic counterpart, AT2017gfo, have provided an important set of observational constraints for theoretical models of neutron star mergers, nucleosynthesis, and radiative transfer for …
View article: Progress towards a 3D Monte Carlo radiative transfer code for outflow wind modelling
Progress towards a 3D Monte Carlo radiative transfer code for outflow wind modelling Open
Context: Radiative transfer modelling of expanding stellar envelopes is an important task in their analysis. To account for inhomogeneities and deviations from spherical symmetry, it is necessary to develop a 3D approach to radiative trans…
View article: Progress towards a 3D Monte Carlo radiative transfer code for outflow wind modelling
Progress towards a 3D Monte Carlo radiative transfer code for outflow wind modelling Open
Context . Radiative transfer modelling of expanding stellar envelopes is an important task in their analysis. To account for inhomogeneities and deviations from spherical symmetry, it is necessary to develop a 3 D approach to radiative tra…
View article: On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae
On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae Open
The progenitor systems and explosion mechanism of Type Ia supernovae are still unknown. Currently favoured progenitors include double-degenerate systems consisting of two carbon-oxygen white dwarfs with thin helium shells. In the double-de…
View article: 3D radiative transfer kilonova modelling for binary neutron star merger simulations
3D radiative transfer kilonova modelling for binary neutron star merger simulations Open
The detection of GW170817 and the accompanying electromagnetic counterpart, AT2017gfo, have provided an important set of observational constraints for theoretical models of neutron star mergers, nucleosynthesis, and radiative transfer for …
View article: HOLISMOKES
HOLISMOKES Open
The Hubble constant ( H 0 ) is one of the fundamental parameters in cosmology, but there is a heated debate around the > 4 σ tension between the local Cepheid distance ladder and the early Universe measurements. Strongly lensed Type Ia sup…
View article: Type Iax supernovae from deflagrations in Chandrasekhar mass white dwarfs
Type Iax supernovae from deflagrations in Chandrasekhar mass white dwarfs Open
Context. Due to the ever increasing number of observations during the past decades, Type Ia supernovae are nowadays regarded as a heterogeneous class of optical transients consisting of several subtypes. One of the largest of these subclas…
View article: Type Iax supernovae from deflagrations in Chandrasekhar mass white dwarfs
Type Iax supernovae from deflagrations in Chandrasekhar mass white dwarfs Open
Due to the increasing number of observations Type Ia supernovae are nowadays regarded as a heterogeneous class of objects consisting of several subclasses. One of the largest of these is the class of Type Iax supernovae (SNe Iax) which hav…
View article: THE FIRST MAXIMUM-LIGHT ULTRAVIOLET THROUGH NEAR-INFRARED SPECTRUM OF A TYPE Ia SUPERNOVA ,
THE FIRST MAXIMUM-LIGHT ULTRAVIOLET THROUGH NEAR-INFRARED SPECTRUM OF A TYPE Ia SUPERNOVA , Open
We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space ...
View article: ASASSN-14lp: two possible solutions for the observed ultraviolet suppression
ASASSN-14lp: two possible solutions for the observed ultraviolet suppression Open
We test the adequacy of ultraviolet (UV) spectra for characterizing the outer structure of Type Ia supernova (SN) ejecta. For this purpose, we perform spectroscopic analysis for ASASSN-14lp, a normal SN Ia showing low continuum in the mid-…
View article: Pre-study and insights to a sequential MATSim-SUMO tool-coupling to deduce 24h driving profiles for SAEVs
Pre-study and insights to a sequential MATSim-SUMO tool-coupling to deduce 24h driving profiles for SAEVs Open
New mobility concepts such as shared, autonomous, electric vehicle (SAEV) fleets raise questions to the vehicles’ technical design. Compared to privately owned human driven cars, SAEVs are expected to exhibit different load profiles that e…
View article: Monte Carlo radiative transfer for the nebular phase of Type Ia supernovae
Monte Carlo radiative transfer for the nebular phase of Type Ia supernovae Open
We extend the range of validity of the artis 3D radiative transfer code up to hundreds of days after explosion, when Type Ia supernovae (SNe Ia) are in their nebular phase. To achieve this, we add a non-local thermodynamic equilibrium popu…
View article: Late-phase radiative transfer of Type Ia supernovae
Late-phase radiative transfer of Type Ia supernovae Open
Type Ia supernovae almost certainly involve the thermonuclear explosion and unbinding of a carbon-oxygen white dwarf, but understanding both the possible role of a binary companion and the mechanism of explosion remain open problems in sup…
View article: Evidence for a Chandrasekhar-mass explosion in the Ca-strong 1991bg-like type Ia supernova 2016hnk
Evidence for a Chandrasekhar-mass explosion in the Ca-strong 1991bg-like type Ia supernova 2016hnk Open
Aims . We present a comprehensive dataset of optical and near-infrared photometry and spectroscopy of type Ia supernova (SN) 2016hnk, combined with integral field spectroscopy (IFS) of its host galaxy, MCG -01-06-070, and nearby environmen…
View article: SN 2012dn from early to late times: 09dc-like supernovae reassessed★
SN 2012dn from early to late times: 09dc-like supernovae reassessed★ Open
As a candidate ‘super-Chandrasekhar’ or 09dc-like Type Ia supernova (SN Ia), SN 2012dn shares many characteristics with other members of this remarkable class of objects but lacks their extraordinary luminosity. Here, we present and discus…
View article: On the Ca-strong 1991bg-like type Ia supernova 2016hnk: evidence for a Chandrasekhar-mass explosion
On the Ca-strong 1991bg-like type Ia supernova 2016hnk: evidence for a Chandrasekhar-mass explosion Open
We present a comprehensive dataset of optical and near-infrared photometry and spectroscopy of type~Ia supernova (SN) 2016hnk, combined with integral field spectroscopy (IFS) of its host galaxy, MCG -01-06-070, and nearby environment. Prop…
View article: Monte-Carlo methods for NLTE spectral synthesis of supernovae
Monte-Carlo methods for NLTE spectral synthesis of supernovae Open
We present JEKYLL, a new code for modelling of supernova (SN) spectra and lightcurves based on Monte-Carlo (MC) techniques for the radiative transfer. The code assumes spherical symmetry, homologous expansion and steady state for the matte…
View article: Type Iax supernovae as a few-parameter family
Type Iax supernovae as a few-parameter family Open
We present direct spectroscopic modeling of five Type Iax supernovae (SNe)\nwith the one dimensional Monte Carlo radiative transfer code TARDIS. The\nabundance tomography technique is used to map the chemical structure and\nphysical proper…
View article: Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae?
Thermonuclear explosions of rapidly differentially rotating white dwarfs: Candidates for superluminous Type Ia supernovae? Open
The observed sub-class of “superluminous” Type Ia supernovae lacks a convincing theoretical explanation. If the emission of such objects were powered exclusively by radioactive decay of 56 Ni formed in the explosion, a progenitor mass clos…
View article: OGLE14-073 – a promising pair-instability supernova candidate
OGLE14-073 – a promising pair-instability supernova candidate Open
The recently discovered bright type II supernova OGLE14-073 evolved very slowly. The light curve rose to maximum for 90 days from discovery and then declined at a rate compatible with the radioactive decay of 56Co. In this study, we show t…
View article: An updated Type II supernova Hubble diagram
An updated Type II supernova Hubble diagram Open
We present photometry and spectroscopy of nine Type II-P/L supernovae (SNe) with redshifts in the 0.045 ≲ z ≲ 0.335 range, with a view to re-examining their utility as distance indicators. Specifically, we apply the expanding photosphere m…
View article: Early light curves for Type Ia supernova explosion models
Early light curves for Type Ia supernova explosion models Open
Upcoming high-cadence transient survey programmes will produce a wealth of\nobservational data for Type Ia supernovae. These data sets will contain\nnumerous events detected very early in their evolution, shortly after\nexplosion. Here, we…