S. Benetti
A5040365078- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Neutrino Physics Research
- Calibration and Measurement Techniques
- Medical Imaging and Pathology Studies
- Astrophysics and Star Formation Studies
- Superconducting Materials and Applications
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Lung Cancer Diagnosis and Treatment
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy and Laser Applications
- Electron Spin Resonance Studies
- Advanced NMR Techniques and Applications
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
Osservatorio Astronomico di Padova
2015-2024
South African Radio Astronomy Observatory
2024
Astronomical Observatory
2024
Cerro Tololo Inter-American Observatory
2024
National Institute for Astrophysics
2006-2021
The University of Tokyo
2005-2013
European Southern Observatory
1991-2011
Institut d'Astrophysique de Paris
2011
Vrije Universiteit Brussel
2011
Tokyo University of Science
2005-2009
We report extensive observational data for five of the lowest redshift Super-Luminous Type Ic Supernovae (SL-SNe Ic) discovered to date, namely PTF10hgi, SN2011ke, PTF11rks, SN2011kf and SN2012il. Photometric imaging transients at +50 +230 days after peak combined with host galaxy subtraction reveals a luminous tail phase four these SL-SNe. A high resolution, optical near infrared spectrum from xshooter provides detection broad He I $\lambda$10830 emission line in (+50d) SN2012il, revealing...
Type Ia supernovae, the thermonuclear explosions of white dwarf stars composed carbon and oxygen, were instrumental as distance indicators in establishing acceleration universe's expansion. However, physics explosion are debated. Here we report a systematic spectral analysis large sample well-observed type supernovae. Mapping velocity distribution main products nuclear burning, constrain theoretical scenarios. We find that all supernovae have low-velocity cores stable iron-group elements....
Type Ia supernovae are important cosmological distance indicators. Each of these bright supposedly results from the thermonuclear explosion a white dwarf star that, after accreting material companion star, exceeds some mass limit, but true nature progenitor system remains controversial. Here we report spectroscopic detection circumstellar in normal type supernova explosion. The expansion velocities, densities, and dimensions envelope indicate that this was ejected system. In particular,...
High-quality collections of Type II supernova (SN) light curves are scarce because they evolve for hundreds days, making follow-up observations time consuming and often extending over multiple observing seasons. In these difficulties, the diversity SNe is not fully understood. Here we present ultraviolet optical photometry 12 monitored by Las Cumbres Observatory Global Telescope Network during 2013 to 2014, compare them with previously studied having well-sampled curves. We explore SN...
We report the results of a three-year-long dedicated monitoring campaign restless luminous blue variable (LBV) in NGC 7259. The object, named SN 2009ip, was observed photometrically and spectroscopically optical near-infrared domains. monitored number erupting episodes past few years, increased density our observations during eruptive episodes. In this paper, we present full historical data set from 2009 to 2012 with multi-wavelength dense coverage two high-luminosity events between August...
HST and ground based observations of the Type IIn SN 2010jl are analyzed, including photometry, spectroscopy in ultraviolet, optical NIR bands, 26-1128 days after first detection. At maximum bolometric luminosity was $\sim 3\times10^{43}$ erg/s even at 850 exceeds $10^{42}$ erg/s. A excess, dominating 400 days, probably originates dust circumstellar medium (CSM). The total radiated energy is $> 6.5\times10^{50}$ ergs, excluding component. spectral lines can be separated into one broad...
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 Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response Moon gravitational waves (GWs). Given size and expected noise produced by lunar seismic background, LGWA would be able observe GWs from about 1 mHz Hz. This make missing link between space-borne detectors like LISA with peak sensitivities around few millihertz future terrestrial Einstein Telescope or Cosmic Explorer. In this article, we provide first...
We present photometry and spectra of the Type IIP supernova 1999em in NGC 1637 from several days after outburst till day 642. The radioactive tail recovered bolometric light curve SN indicates that amount ejected 56Ni is . Hα He i 10 830-Å lines at nebular epoch show distribution bulk can be represented approximately by a sphere with velocity 1500 km s−1, which shifted towards far hemisphere about 400 s−1. fine structure photospheric reminiscent 'Bochum event' 1987A analysed terms two...
Photometric and spectroscopic data of the energetic Type Ic supernova (SN) 2002ap are presented, properties SN investigated through models its spectral evolution light curve. The is spectroscopically similar to "hypernova" 1997ef. However, kinetic energy [~(4-10) × 1051 ergs] mass ejected (2.5-5 M☉) smaller, resulting in a faster evolving synthesized ~0.07 M☉ 56Ni, peak luminosity was that normal SNe. Brightness alone should not be used define hypernova, whose defining character, namely very...
The photometric and spectroscopic properties of 26 well observed Type Ia Supernovae (SNeIa) were analyzed with the aim to explore SNIa diversity. sample includes (Branch-)normal SNe as extreme events like 1991T 1991bg, while truly peculiar SNIa, SN2000cx SN2002cx are not included in our . A statistical treatment reveals existence three different groups. first group (FAINT) consists faint SNeIa similar SN1991bg, low expansion velocities rapid evolution SiII velocity. second ``normal'' SNeIa,...
The results of a worldwide coordinated observational campaign on the broad-lined Type Ic supernova (SN Ic) 2003jd are presented. In total, 74 photometric data points and 26 spectra were collected using 11 different telescopes. SN is one most luminous ever observed. A comparison with other supernovae (SNe confirms that represents an intermediate case between broad-line events (2002ap, 2006aj) highly energetic SNe (1997ef, 1998bw, 2003dh, 2003lw), ejected mass Mej= 3.0 ± 1 M⊙ kinetic energy...
In this paper we present spectroscopic and photometric observations for four core collapse supernovae (SNe), namely SNe 1994N, 1999br, 1999eu 2001dc. Together with SN 1997D, show that they form a group of exceptionally low-luminosity events. These have narrow spectral lines (indicating low expansion velocities) luminosities at every phase (significantly lower than those typical core-collapse supernovae). The very luminosity during the ^{56}Co radioactive decay tail indicates mass ^{56}Ni...
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 present the results of one-year long observational campaign type II plateau SN 2005cs, which exploded in nearby spiral galaxy M51 (the Whirlpool galaxy). This extensive data set makes 2005cs best observed low-luminosity, 56Ni-poor event so far and one core-collapse supernovae ever. The optical near-infrared spectra show narrow P-Cygni lines characteristic this family, are indicative a very low expansion velocity (about 1000 km s−1) ejected material. light curves cover both phase late-time...
The abundance stratification in the ejecta of normal Type Ia supernova 2002bo is derived by fitting a series spectra obtained at close time intervals. A Monte Carlo code, modified to include stratification, used compute synthetic 13 epochs photospheric phase, starting 13d before B maximum. description distribution above 7600 km/s thus obtained. Abundances deeper layers, down zero velocity, are from models two nebular-phase spectra. Elements synthesized different stages burning significantly,...
The type la supernova SN 1994D in NGC 4526 was extensively observed as a target of opportunity at ESO. In this paper, we present and discuss the UBVRI photometry spectra collected during campaign from 11 days before maximum to about two months afterwards. Several absorption components Na I D lines arising our Galaxy, high-velocity clouds located between have been identified high resolution spectrum. total amount reddening related these features has estimated E(B- V)=0.06. light curve shapes...
Type Ic supernovae, the explosions after core collapse of massive stars that have previously lost their hydrogen and helium envelopes, are particularly interesting because link with long-duration gamma ray bursts. Although indications exist these aspherical, direct evidence has been missing. Late-time observations supernova SN 2003jd, a luminous type supernova, provide such evidence. Recent Subaru Keck spectra reveal double-peaked profiles in nebular lines neutral oxygen magnesium. These...
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...