A5012434619- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Atmospheric and Environmental Gas Dynamics
- Scientific Computing and Data Management
- Research Data Management Practices
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Atmospheric chemistry and aerosols
- Species Distribution and Climate Change
- Astronomy and Astrophysical Research
- Environmental Monitoring and Data Management
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Advanced Data Storage Technologies
- Climate Change Communication and Perception
- Astronomical Observations and Instrumentation
- Data Management and Algorithms
- Mitochondrial Function and Pathology
- Wind and Air Flow Studies
- Spectroscopy and Laser Applications
- Semantic Web and Ontologies
- Atmospheric Ozone and Climate
Leibniz Supercomputing Centre
2016-2025
Bavarian Academy of Sciences and Humanities
2016-2025
University of Würzburg
2013-2017
Max Planck Institute for Astrophysics
2006-2015
Osservatorio Astronomico di Padova
2009-2015
National Institute for Astrophysics
2009-2014
Max Planck Society
2011
The University of Tokyo
2009
Tokyo University of Science
2009
The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. We describe the data reduction strategy and products which are publicly available through ESO archive Data Release 1 (SSDR1). PESSTO uses New Technology Telescope with EFOSC2 SOFI to provide optical NIR spectroscopy imaging. target supernovae transients brighter than 20.5mag for classification. Science targets then selected follow-up based on...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
On May 31, 2011 UT a supernova (SN) exploded in the nearby galaxy M51 (the Whirlpool Galaxy). We discovered this event using small telescopes equipped with CCD cameras, as well by Palomar Transient Factory (PTF) survey, and rapidly confirmed it to be Type II supernova. Our early light curve spectroscopy indicates that PTF11eon resulted from explosion of relatively compact progenitor star evidenced rapid shock-breakout cooling seen curve, low temperature early-time spectra prompt appearance...
The origin of subluminous Type Ia supernovae (SNe Ia) has long eluded any explanation, as all Chandrasekhar-mass models have severe problems reproducing them. Recently, it been proposed that violent mergers two white dwarfs 0.9 M_sun could lead to SNe events resemble 1991bg-like SNe~Ia. Here we investigate whether this scenario still works for with a mass ratio smaller than one. We aim determine the range ratios which detonation forms during merger, only those will SN Ia. This is an...
H and He features in photospheric spectra have seldom been used to infer quantitatively the properties of Type IIb, Ib Ic supernovae (SNe Ic) their progenitor stars. Most radiative transfer models ignored NLTE effects, which are extremely strong especially He-dominated zones. In this paper, a comprehensive set model atmospheres for low-mass SNe IIb/Ib/Ic is presented. Long-standing questions such as how much can be contained Ic, where lines not seen, thus addressed. The state computed full...
Hubble Space Telescope spectroscopic observations of the nearby type Ia supernova (SN Ia) SN2011fe, taken on 10 epochs from -13.1 to +40.8 days relative B-band maximum light, and spanning far-ultraviolet (UV) near-infrared (IR) are presented. This coverage makes SN2011fe best-studied local SN date. is a typical moderately-luminous with no evidence for dust extinction. Its near-UV spectral properties representative larger sample events (Maguire et al. 2012). The optical spectra modelled Monte...
Extended optical and near-IR observations reveal that SN 2009dc shares a number of similarities with normal Type Ia supernovae (SNe Ia), but is clearly overluminous, (pseudo-bolometric) peak luminosity log (L) = 43.47 (erg s−1). Its light curves decline slowly over half year after maximum [Δm15(B)true= 0.71], the early-time show secondary maxima, although minima between first second peaks are not very pronounced. The bluer bands exhibit an enhanced fading ∼200 d, which might be caused by...
A key tracer of the elusive progenitor systems Type Ia supernovae (SNe Ia) is detection narrow blueshifted time-varying Na i D absorption lines, interpreted as evidence circumstellar material surrounding system. The origin this controversial, but simplest explanation that it results from previous mass-loss in a system containing white dwarf and non-degenerate companion star. We present new single-epoch intermediate-resolution spectra 17 low-redshift SNe taken with XShooter on European...
In order to assess qualitatively the ejecta geometry of stripped-envelope core-collapse supernovae, we investigate 98 late-time spectra 39 objects, many them previously unpublished. We perform a Gauss-fitting [O I] 6300, 6364 feature in all spectra, with position, full width at half maximum (FWHM) and intensity 6300 Gaussian as free parameters, added appropriately account for doublet nature feature. On basis best-fit objects are organised into morphological classes, conclude that least Type...
Optical observations of the Type Ia supernova (SN Ia) 2005bl in NGC 4070, obtained from -6 to +66 d with respect B-band maximum, are presented.The photometric evolution is characterized by rapidly declining light curves [ m 15 (B) true = 1.93] and red colours at peak soon thereafter.With M B,max -17.24 SN an underluminous Ia, similar peculiar SNe 1991bg 1999by.This similarity also holds for spectroscopic appearance, only remarkable difference being likely presence carbon pre-maximum spectra...
In the ultraviolet (UV), Type Ia supernovae (SNe Ia) show a much larger diversity in their properties than optical. Using stationary Monte Carlo radiative transfer code, grid of spectra at maximum light was created varying bolometric luminosity and amount metals outer layers SN ejecta. This model is then compared to sample high-redshift SNe order test whether observed diversities can be explained by metallicity changes alone. The dispersion broad-band UV flux colours approximately constant...
A series of optical and one near-infrared nebular spectra covering the first year Type Ia supernova SN 2011fe are presented modelled. The density profile that proved best for early optical/ultraviolet spectra, 'ρ-11fe', was extended to lower velocities include regions emit at epochs. Model ρ-11fe is intermediate between fast deflagration model W7 a low-energy delayed-detonation. Good fits obtained if innermost ejecta dominated by neutron-rich, stable Fe-group species, which contribute...
We present optical photometry and spectra of the superluminous Type II/IIn supernova (SN) CSS121015:004244+132827 (z = 0.2868) spanning epochs from −30 d (rest frame) to more than 200 after maximum. CSS121015 is one luminous SNe ever found best observed. The photometric evolution characterized by a relatively fast rise maximum (∼40 in SN rest frame), linear post-maximum decline. light curve shows no sign break an exponential tail. A broad Hα first detected at ∼+40 frame). Narrow, barely...
We investigate light-curve and spectral properties of ultra-stripped core-collapse supernovae. Ultra-stripped supernovae are the explosions heavily stripped massive stars which lost their envelopes via binary interactions with a compact companion star. They eject only ~ 0.1 Msun may be main way to form double neutron-star systems eventually merge emitting strong gravitational waves. follow evolution an supernova progenitor until iron core collapse perform explosive nucleosynthesis...
We present 75 near-infrared (NIR; 0.8$-$2.5 $\mu$m) spectra of 34 stripped-envelope core-collapse supernovae (SESNe) obtained by the Carnegie Supernova Project-II (CSP-II), encompassing optical spectroscopic Types IIb, Ib, Ic, and Ic-BL. The range in phase from pre-maximum to 80 days past maximum. This unique data set constitutes largest NIR sample SESNe date. spectroscopy provides observables with additional information that is not available optical. Specifically, contains resonance lines...
The properties of the highest velocity ejecta normal Type Ia supernovae (SNe Ia) are studied via models very early optical spectra six SNe. At epochs earlier than 1 week before maximum, SNe with a rapidly evolving Si II λ6355 line (HVG) have larger photospheric slowly (LVG). Since two groups comparable luminosities, temperature at photosphere is higher in LVG This explains different overall spectral appearance HVG and However, variation Ca absorptions velocities (v≳ 20,000 km s−1) suggests...
We present a first systematic comparison of superluminous Type Ia supernovae (SNe Ia) at late epochs, including previously unpublished photometric and spectroscopic observations SN 2007if, 2009dc SNF20080723-012. Photometrically, the objects our sample show diverse late-time behaviour, some them fading quite rapidly after light-curve break ~150-200d. The latter is likely result flux redistribution into infrared, possibly caused by dust formation, rather than true bolometric effect. Nebular...
In this letter a late-phase spectrum of SN 2010lp, subluminous Type Ia supernova (SN Ia), is presented and analysed. As in 1991bg-like SNe at comparable epochs, the characterised by relatively broad [FeII] [CaII] emission lines. However, instead narrow [FeIII] [CoIII] lines that dominate from innermost regions SNe, 2010lp shows [OI] 6300,6364 emission, usually associated with core-collapse never observed thermonuclear explosion before. The feature has complex profile two strong, peaks. This...
We present photometric and spectroscopic observations of the interacting transient SN 2009ip taken during 2013 2014 observing seasons. characterize evolution as a steady smooth decline in all bands, with rate that is slower than expected for solely 56Co-powered supernova at late phases. No further outbursts or eruptions were seen over two year period from 2012 December until December. remains brighter its historic minimum pre-discovery images. Spectroscopically, continues to be dominated by...
Abstract. Though they cover less than 3 % of the global land area, urban areas are responsible for over 70 greenhouse gas (GHG) emissions and contain 55 population. A quantitative tracking GHG in is therefore great importance, with aim accurately assessing amount identifying emission sources. The Weather Research Forecasting model (WRF) coupled modules (WRF-GHG) developed mesoscale atmospheric transport can predict column-averaged abundances CO2 CH4 (XCO2 XCH4). In this study, we use WRF-GHG...
At the Leibniz Supercomputing Centre (LRZ) of Bavarian Academy Sciences and Humanities, we have set up a portal system to publish large datasets from simulations, assign DOIs, present landing pages. This "LRZ FAIR Data Portal" - currently in demonstrator status is based on InvenioRDM, with idea using this framework as presentation layer. The login data-upload possibilities typical for repositories are disabled setup. Instead, presents metadata together dataset-specific link GLOBUS...
The velocities and equivalent widths (EWs) of a set absorption features are measured for sample 28 well-observed Type Ia supernovae (SNe Ia) covering wide range properties. values these quantities at maximum obtained through interpolation/extrapolation plotted against the decline rate, so various line ratios. SNe divided according to their velocity evolution into three classes defined in previous work Benetti et al.: low gradient (LVG), high (HVG) FAINT. It is found that all LVG have...
Extremely luminous, super-Chandrasekhar (SC) Type Ia Supernovae (SNe Ia) are as yet an unexplained phenomenon. We analyse a well-observed SN of this class, 2009dc, by modelling its photospheric spectra with spectral synthesis code, using the technique 'Abundance Tomography'. present models based on different density profiles, corresponding to explosion scenarios, and discuss their consistency. First, we use structure simulated 2 M_sun rotating C-O white dwarf (WD), which is often proposed...
Radiative transfer studies of Type Ia supernovae (SNe Ia) hold the promise constraining both density profile SN ejecta and its stratification by element abundance which, in turn, may discriminate between different explosion mechanisms progenitor classes. Here we analyse 2010jn (PTF10ygu) detail, presenting evaluating near-ultraviolet (near-UV) spectra from Hubble Space Telescope ground-based optical light curves. was discovered Palomar Transient Factory (PTF) 15 d before maximum light,...