A5011669608- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Advanced NMR Techniques and Applications
- Spectroscopy and Laser Applications
- Nuclear Physics and Applications
- Medical Imaging and Pathology Studies
- History and Developments in Astronomy
- SAS software applications and methods
- Methane Hydrates and Related Phenomena
- Electron Spin Resonance Studies
Osservatorio Astronomico di Padova
2016-2025
University of Padua
2017-2025
National Institute for Astrophysics
2009-2018
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...
Abstract We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. identify high-ionization emission features, signatures interaction with material surrounding progenitor star, that fade over first 7 days, rapid between observed within same night. compare lines and their relative strength those other supernovae early interaction, finding a close match 2020pni 2017ahn spectrum 2014G at later epochs. To physically...
A set of hydrodynamical models based on stellar evolutionary progenitors is used to study the nature SN 2011dh. Our modeling suggests that a large progenitor star ---with R ~200 Rsun---, needed reproduce early light curve This consistent with suggestion yellow super-giant detected at location in deep pre-explosion images star. From main peak bolometric and expansion velocities we constrain mass ejecta be ~2 Msun, explosion energy E= 6-10 x 10^50 erg, 56Ni approximately 0.06 Msun. The was...
Abstract We present early photometric and spectroscopic observations of SN 2013ej, a bright Type IIP supernova (SN) in M74. 2013ej is one the closest SNe ever discovered. The available archive images discovery help to constrain nature its progenitor. earliest detection this explosion was on 2013 July 24.125 ut our monitoring with FLOYDS spectrographs began 27.7 ut, continuing almost daily for two weeks. Daily optical achieved 1 m telescopes Las Cumbres Observatory Global Telescope (LCOGT)...
We present optical and near-infrared (NIR) photometry spectroscopy of the Type IIb supernova (SN) 2011dh for first 100 days. complement our extensive dataset with SWIFT ultra-violet (UV) Spitzer mid-infrared (MIR) data to build a UV MIR bolometric lightcurve using both photometric spectroscopic data. Hydrodynamical modelling SN based on this have been presented in Bersten (2012). find that absorption minimum hydrogen lines is never seen below ~11000 km/s but approaches value as get weaker....
We present extensive datasets for a class of intermediate-luminosity optical transients known as luminous red novae. They show double-peaked light curves, with an initial rapid luminosity rise to blue peak (at −13 −15 mag), which is followed by longer-duration that sometimes attenuated, resembling plateau. The progenitors three them (NGC 4490−2011OT1, M 101−2015OT1, and SNhunt248), likely relatively massive yellow stars, were also observed in pre-eruptive stage when their was slowly...
We present the one-year long observing campaign of SN 2012A which exploded in nearby (9.8 Mpc) irregular galaxy NGC 3239. The photometric evolution is that a normal Type IIP supernova, but plateau shorter and luminosity not as constant other supernovae this type. absolute maximum magnitude, with MB = −16.23 ± 0.16 mag, close to average for IIP. Thanks also strong UV flux early phase, reached peak about 2 × 1042 erg s−1, brighter than those SNe similar 56Ni mass. latter was estimated from...
We present an extensive optical and near-infrared photometric spectroscopic campaign of the Type IIP supernova SN 2012aw. The data set densely covers evolution 2012aw shortly after explosion through end photospheric phase, with two additional observations collected during nebular to fit radioactive tail estimate 56Ni mass. Also included in our analysis is previously published Swift UV data, therefore providing a complete view ultraviolet-optical-infrared phase. On basis set, we all relevant...
We present multiband ultraviolet, optical, and near-infrared photometry, along with visual-wavelength spectroscopy, of supernova (SN) 2014G in the nearby galaxy NGC 3448 (25 Mpc). The early-phase spectra show strong emission lines high ionization species He ii/N iv/C iv during first 2–3 d after explosion, traces a metal-rich circumstellar material (CSM) probably due to pre-explosion mass-loss events. These disappear by day 9 spectral evolution then continues matching that normal Type II SNe....
Optical observations of the Type IIb SN 2013df from a few days to about 250 d after explosion are presented. These complemented with UV photometry taken by SWIFT up 60 post-explosion. The double-peak optical light curve is similar those SNe 1993J and 2011fu although different decline rise rates. From modelling bolometric curve, we have estimated that total mass synthesized 56Ni in ∼0.1 M⊙, while ejecta 0.8–1.4 M⊙ energy 0.4–1.2 × 1051 erg. In addition, lower limit progenitor radius ranging...
We present optical and near-infrared photometric spectroscopic observations of SN 2013ej, in galaxy M74, from 1 to 450 d after the explosion. 2013ej is a hydrogen-rich supernova, classified as Type IIL due its relatively fast decline following initial peak. It has high peak luminosity (absolute magnitude MV = −17.6) but small 56Ni production ∼0.023 M⊙. Its photospheric evolution similar other II SNe, with shallow absorption Hα profile typical for IIL. During transition radioactive decay tail...
Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ~ -13.4 mag, and initially classified as a SN impostor. Here we present the photometric spectroscopic evolution from discovery to late phases (~ 1 yr after). In addition, inspect archival images host galaxy up 21 before discovery, finding burst further signatures stellar instability until 2014. Later on, luminosity transient slowly increases, broad light curve peak is reached...
We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved almost daily cadence with observations from five ground-based telescopes. H$\beta$ He II $\lambda$4686 broad emission-line light curves lag that 5100 $\AA$ continuum by $4.17^{+0.36}_{-0.36}$ days $0.79^{+0.35}_{-0.34}$ days, respectively. relative to 1158 ultraviolet curve measured Hubble Space...
We present ultraviolet, optical and near-infrared data of the Type Ibn supernovae (SNe) 2010al 2011hw. SN reaches an absolute magnitude at peak MR = −18.86 ± 0.21. Its early light curve shows similarities with normal SNe Ib, a rise to maximum slower than most Ibn. The spectra are dominated by blue continuum stages, narrow P-Cygni He i lines indicating presence slow-moving, He-rich circumstellar medium. At later epochs, well match those prototypical 2006jc, although broader suggest that...
We present spectroscopic and photometric data of the Type Ibn supernova (SN) 2014av, discovered by Xingming Observatory Sky Survey. Stringent pre-discovery detection limits indicate that object was detected for first time about 4 days after explosion. A prompt follow-up campaign arranged amateur astronomers allowed us to monitor rising phase (lasting 10.6 days) accurately estimate epoch maximum light, on 2014 April 23 (JD = 2456771.1 +/- 1.2). The absolute magnitude SN at light is M(R)...
Supernova (SN) 2016bdu is an unusual transient resembling SN 2009ip. 2009ip-like events are characterized by a long-lasting phase of erratic variability which ends with two luminous outbursts few weeks apart. The second outburst significantly more (about 3 mag) than the first. In case 2016bdu, first (Event A) reached absolute magnitude M(r) ~ -15.3 mag, while one B) occurred over month later and -18 mag. By inspecting archival data, faint source at position detectable several times in past...
Core-collapse supernovae (SNe) are the spectacular finale to massive stellar evolution. In this Letter, we identify a progenitor for nearby core-collapse SN 2012aw in both ground-based near-infrared and space-based optical pre-explosion imaging. The itself appears be normal Type II Plateau event, reaching bolometric luminosity of 1042 erg s−1 photospheric velocities ∼11,000 km from position Hβ P-Cygni minimum early spectra. We use an adaptive optics image show that is coincident within 27...
We present the results of optical, near-infrared, and mid-infrared observations M101 OT2015-1 (PSN J14021678+5426205), a luminous red transient in Pinwheel galaxy (M101), spanning total 16 years. The lightcurve showed two distinct peaks with absolute magnitudes $M_r\leq-12.4$ $M_r \simeq-12$, on 2014 November 11 2015 February 17, respectively. spectral energy distributions during second maximum show cool outburst temperature $\approx$3700 K low expansion velocities ($\approx-$300 \kms) for H...
We report photometric and spectroscopic observations of the optical transient LSQ13zm. Historical data reveal presence an eruptive episode (that we label as `2013a') followed by a much brighter outburst (`2013b') three weeks later, that argue to be genuine supernova explosion. This sequence events closely resemble those observed for SN2010mc (in 2012) SN2009ip. The absolute magnitude reached LSQ13zm during 2013a ($M_R=-14.87\pm0.25\,\rm{mag}$) is comparable with impostors, while 2013b event...
We present densely-sampled ultraviolet/optical photometric and low-resolution optical spectroscopic observations of the type IIP supernova 2013ab in nearby ($\sim$24 Mpc) galaxy NGC 5669, from 2 to 190d after explosion. Continuous observations, with cadence typically a day one week, were acquired 1-2m class telescopes LCOGT network, ARIES India various other around globe. The light curve spectra suggest that SN is normal event plateau duration $ \sim80 days mid absolute visual magnitude...
In this paper we continue the release of high-level data products from multiyear photometric survey collected at 67/92 cm Schmidt Telescope in Asiago. The primary goal is to discover and characterise variable objects exoplanetary transits four fields containing five nearby open clusters spanning a broad range ages. This second releases catalogue, bands, Solar-age, Solar-metallicity cluster M 67 (NGC 2682). Proper motions are derived comparing positions observed 2013 Asiago's with those...
We present the results of a photometric and spectroscopic monitoring campaign SN 2012ec, which exploded in spiral galaxy NGC 1084, during photospheric phase. The light curve exhibits plateau with luminosity L= 0.9 x 10^{42} erg/s duration ~90 days, is somewhat shorter than standard Type II-P supernovae. estimate nickel mass as 0.040 +/- 0.015 Msun from at beginning radioactive tail curve. explosion parameters 2012ec were estimated comparison bolometric observed temperature velocity evolution...
Hydrogen-poor superluminous supernovae (SLSNe-I) have been predominantly found in low-metallicity, star-forming dwarf galaxies. Here we identify Gaia17biu/SN 2017egm as an SLSN-I occurring a "normal" spiral galaxy (NGC 3191) terms of stellar mass (several times 10^10 M_sun) and metallicity (roughly Solar). At redshift z=0.031, Gaia17biu is also the lowest to date, absence larger population SLSNe-I galaxies similar suggests that likely less important production than previously believed. With...
We investigate the spectroscopic characteristics of intermediate-luminosity Red Transients (ILRTs), a class elusive objects with peak luminosity between that classical novae and standard supernovae. Our goal is to provide stepping stone in path unveiling physical origin these events based on analysis collected datasets. present extensive optical near-infrared (NIR) monitoring four ILRTs, namely NGC 300 2008OT-1, AT 2019abn, 2019ahd 2019udc. First we focus evolution most prominent spectral...
We investigate the photometric characteristics of a sample intermediate-luminosity red transients (ILRTs), class elusive objects with peak luminosity between that classical novae and standard supernovae. Our goal is to provide stepping stone in path reveal physical origin such events, thanks analysis datasets collected. present multi-wavelength follow-up four ILRTs, namely NGC 300 2008OT-1, AT 2019abn, 2019ahd, 2019udc. Through modelling their spectral energy distribution bolometric light...