M. Della Valle
A5041595103- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Historical Astronomy and Related Studies
Astronomical Observatory of Capodimonte
2016-2025
International Center for Relativistic Astrophysics
2015-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2018-2023
TU Dortmund University
2023
University of Łódź
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
University of Turku
2023
Niels Brock
2023
University of Copenhagen
2023
Main Astronomical Observatory
2023
We compute the rate of supernovae (SNe) different types along Hubble sequence normalized to near-infrared luminosity and stellar mass parent galaxies. This is made possible by new complete catalog galaxy magnitudes obtained 2MASS. find that rates all SN types, including Ia, Ib/c II, show a sharp dependence on both morphology () colors galaxies and, therefore, star formation activity. In particular we find, with high statistical significance, type Ia in late factor ~20 higher than E/S0....
We use recent observations of the evolution Type Ia supernova (SN Ia) rate with redshift, dependence SN on colours parent galaxies, and enhancement in radio-loud early-type galaxies to derive robust empirical grounds, delay time distribution (DTD) between formation progenitor star its explosion as an SN. Our analysis finds: (i) times long 3–4 Gyr, derived from SNe at high cannot reproduce radio-luminosity observed local Universe; (ii) comparison rates a grid theoretical 'single-population'...
We have used the Ep,i–Eiso correlation of gamma-ray bursts (GRBs) to measure cosmological parameter ΩM. By adopting a maximum likelihood approach which allows us correctly quantify extrinsic (i.e. non-Poissonian) scatter correlation, we constrain (for flat universe) ΩM 0.04–0.40 (68 per cent confidence level), with best-fitting value ΩM∼ 0.15, and exclude ΩM= 1 at >99.9 level. If release assumption universe, still find evidence for low (0.04–0.50 68 level) weak dependence dispersion on ΩΛ...
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
Gamma-ray bursts (GRBs) have been separated into two classes, originally along the lines of duration and spectral properties, called "short/hard" "long/soft." The latter conclusively linked to explosive deaths massive stars, while former are thought result from merger or collapse compact objects. In recent years, indications accumulating that short/hard versus long/soft division does not map directly onto what would be expected classes progenitors, leading a new classification scheme Type I...
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...
Abstract The detection of the accelerated expansion Universe has been one major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) have studied depth to better understand nature mechanism driving this acceleration, and they are being currently pushed their limits, obtaining remarkable constraints that allowed us shape standard model. In parallel that, however, percent precision achieved recently...
Abstract Gamma-ray bursts (GRBs) are classified into long and short events. Long GRBs (LGRBs) associated with the end states of very massive stars, while (SGRBs) linked to merger compact objects. GRB 200826A was a peculiar event, because by definition it an SGRB, rest-frame duration ∼0.5 s. However, this event energetic soft, which is consistent LGRBs. The relatively low redshift ( z = 0.7486) motivated comprehensive, multiwavelength follow-up campaign characterize its host, search for...
Long and short gamma-ray bursts (GRBs) are thought to arise from different unrelated astrophysical progenitors. The association of long GRBs with supernovae (SNe) the difference in distributions galactocentric offsets within their host galaxies have often been considered strong evidence origins. result collapse single massive stars, while come mergers compact-object binaries. Our present study challenges this conventional view. We demonstrate that observational properties, such as SNe...
Optical and near-infrared observations of the gamma-ray burst GRB 031203, at z = 0.1055, are reported. A very faint afterglow is detected superposed onto host galaxy in our first infrared JHK observations, carried out ~9 hr after burst. Subsequently, a rebrightening all bands, peaking R band about 18 rest-frame days The closely resembles light curve supernova like SN 1998bw, assuming that went off almost simultaneously, but with somewhat slower evolution. Spectra taken close to maximum show...
We measure the local rates of "low-luminosity" gamma-ray bursts (LL GRBs; i.e., L ≲ 1049 ergs s-1) and "high-luminosity" (HL GRBs). The values are in range 0 = 100-1800 Gpc-3 yr-1 100-550 yr-1, respectively, their ratios to Type Ibc supernovae (SNe Ibc) ~1%-9% 0.4%-3%, respectively. These data may suggest existence two physically distinct classes GRBs which LL (intrinsically) more frequent events than HL GRBs. However, with present data, we cannot exclude possibility a single population that...
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The only supernovae (SNe) to show gamma-ray bursts (GRBs) or early x-ray emission thus far are overenergetic, broad-lined type Ic SNe (hypernovae, HNe). Recently, SN 2008D has shown several unusual features: (i) weak flash (XRF), (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical HNe, and (iv) development helium as in Ib. Detailed analysis shows that was not a normal supernova: Its explosion energy (E approximately 6x10(51) erg) ejected mass [ 7 times Sun...
We assemble a sample of 24 hydrogen-poor super-luminous supernovae (SLSNe). Parameterizing the light curve shape through rise and decline timescales shows that two are highly correlated. Magnetar-powered models can reproduce correlation, with diversity in rates driven by diffusion timescale. Circumstellar interaction exhibit similar rise-decline relation, but only for narrow range densities, which may be problematic these models. find SLSNe approximately 3.5 magnitudes brighter have curves 3...
We present new spectroscopic and photometric data of the type Ibn supernovae 2006jc, 2000er 2002ao. discuss general properties this recently proposed supernova family, which also includes SN 1999cq. The early-time monitoring traces evolution class objects during first few days after shock breakout. An overall similarity in is found among members group, would be unexpected if energy these core-collapse events was dominated by interaction between ejecta circumstellar medium. Type appear to...
The supernova (SN) delay-time distribution (DTD) - the SN rate versus time that would follow a brief burst of star formation can shed light on progenitors, and chemical enrichment timescales. Previous attempts to recover DTD have used comparisons mean rates vs. redshift cosmic star-formation history (SFH), or comparison among galaxies different ages. We present an approach avoids such averaging. compare SFHs individual numbers SNe discovered in each galaxy (generally zero, sometimes one few...