A. Morales-Garoffolo
A5037576015- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Advanced Power Generation Technologies
- Neutrino Physics Research
- Advanced MRI Techniques and Applications
- Higher Education Teaching and Evaluation
- Astrophysics and Star Formation Studies
- Advanced NMR Techniques and Applications
- Education and Teacher Training
- Nuclear Engineering Thermal-Hydraulics
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Educational Innovations and Technology
- Adaptive optics and wavefront sensing
- Mitochondrial Function and Pathology
- Methane Hydrates and Related Phenomena
- Superconducting Materials and Applications
Universidad de Cádiz
2017-2024
Institute of Space Sciences
2013-2016
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...
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 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...
The light curves of Type Ia supernovae (SNe Ia) are powered by the radioactive decay $^{56}$Ni to $^{56}$Co at early times, and $^{56}$Fe from ~60 days after explosion. We examine evolution [Co III] 5892 A emission complex during nebular phase for SNe with multiple spectra show that line flux follows square mass as a function time. This result indicates both efficient local energy deposition positrons produced in decay, long-term stability ionization state nebula. compile 77 25 SN literature...
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 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...
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...
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...
Abstract Dust associated with various stellar sources in galaxies at all cosmic epochs remains a controversial topic, particularly whether supernovae play an important role dust production. We report evidence of formation the cold, dense shell behind ejecta–circumstellar medium (CSM) interaction Type Ia-CSM supernova (SN) 2018evt three years after explosion, characterized by rise mid-infrared emission accompanied accelerated decline optical radiation SN. Such dust-formation picture is also...
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 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...
In this paper we report the results of first ~four years spectroscopic and photometric monitoring Type IIn supernova SN 2015da (also known as PSN J13522411+3941286, or iPTF16tu). The exploded in nearby spiral galaxy NGC 5337 a relatively highly extinguished environment. transient showed prominent narrow Balmer lines emission at all times slow rise to maximum bands. addition, early observations performed by amateur astronomers give very well-constrained explosion epoch. observables are...
We present optical and near infrared observations of the type IIb supernova (SN) 2011fu from a few days to $\sim300$ d after explosion. The SN presents double-peaked light curve (LC) similar that 1993J, although more luminous with longer cooling phase primary peak. spectral evolution is also 1993J's, hydrogen dominating spectra $\sim40$ d, then helium gaining strength, nebular emission lines appearing $\sim60$ post-explosion. velocities derived P-Cygni absorptions are overall those other...
Context. The absolute magnitudes of luminous red novae (LRNe) are intermediate between those and supernovae (SNe), show a relatively homogeneous spectro-photometric evolution. Although they were thought to derive from core instabilities in single stars, there is growing support for the idea that triggered by binary interaction possibly ends with merging two stars. Aims. AT 2018hso new transient showing transitional properties LRNe class intermediate-luminosity transients (ILRTs) similar SN...
We present optical observations of the peculiar Type Ibn supernova (SN Ibn) OGLE-2012-SN-006, discovered and monitored by OGLE-IV survey, spectroscopically followed PESSTO at late phases. Stringent pre-discovery limits constrain explosion epoch with fair precision to JD = 2456203.8 +- 4.0. The rise time I-band light curve maximum is about two weeks. object reaches peak absolute magnitude M(I) -19.65 0.19 on 2456218.1 1.8. After maximum, declines for 25 days a rate 4 mag per 100d. symmetric...
We present optical observations of the peculiar stripped-envelope supernovae (SNe) LSQ12btw and LSQ13ccw discovered by La Silla-QUEST survey. reaches an absolute peak magnitude M(g) = -19.3 +- 0.2, shows asymmetric light curve. Stringent prediscovery limits constrain its rise time to maximum less than 4 days, with a slower post-peak luminosity decline, similar that experienced prototypical SN~Ibn 2006jc. is somewhat different: while it also exhibits very fast maximum, fainter (M(g) -18.4...
We present the results of our photometric and spectroscopic follow-up intermediate-luminosity optical transient AT 2017jfs. At peak, object reaches an absolute magnitude Mg=-15.46+-0.15 mag a bolometric luminosity 5.5x10^41 erg/s. Its light curve has double-peak shape typical Luminous Red Novae (LRNe), with narrow first peak bright in blue bands, while second is longer lasting more luminous red near-infrared (NIR) bands. During spectrum shows continuum emission lines H Fe II. becomes cooler,...
We present a comprehensive set of optical and near-infrared photometric spectroscopic observations for SN 2014ck, extending from pre-maximum to six months later. These data indicate that 2014ck is photometrically nearly identical 2002cx, which the prototype class peculiar transients named SNe Iax. Similar reached peak brightness $M_B=-17.37 \pm 0.15$ mag, with post-maximum decline-rate $\Delta m_{15} (B) = 1.76 mag. However, sequence shows similarities 2008ha, was three magnitudes fainter...
We present one year of optical and near-infrared photometry spectroscopy the Type IIP SNe 2013K 2013am. Both objects are affected by significant extinction, due to their location in dusty regions respective host galaxies, ESO 009-10 NGC 3623 (M65). From photospheric nebular phases, these display spectra congruent with those underluminous (i.e. archetypal 1997D or 2005cs), showing low velocities (~2 X 10**3 km/s at 50d) together features arising from Ba II which particularly prominent faint...
We present the results of our monitoring campaigns luminous red novae (LRNe) AT 2020hat in NGC 5068 and 2020kog 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend slow luminosity rise, lasting at least few months. subsequent major LRN outbursts extensively followed photometry spectroscopy. light curves an initial short-duration peak, redder plateau phase. is moderately event peaking ∼7 × 10 40 erg s −1 , while...
We present the spectroscopic and photometric study of five intermediate-luminosity red transients (ILRTs), namely AT 2010dn, 2012jc, 2013la, 2013lb, 2018aes. They share common observational properties belong to a family objects similar prototypical ILRT SN~2008S. These events have rise time that is less than 15 days absolute peak magnitudes between $-11.5$ $-14.5$ mag. Their pseudo-bolometric light curves in range $0.5$ - $9.0 \times10^{40}~\mathrm{erg~s}^{-1}$ their total radiated energies...
We present the results of spectroscopic and photometric monitoring campaign ASASSN-15ed. The transient was discovered quite young by All Sky Automated Survey for SuperNovae (ASAS-SN). Amateur astronomers allowed us to sample SN evolution around maximum light, which we estimate have occurred on JD = 2457087.4 +- 0.6 in r-band. Its apparent r-band magnitude at r 16.91 0.10, providing an absolute M(r) ~ -20.04 0.20, is slightly more luminous than typical magnitudes estimated Type Ibn SNe....
We present nebular-phase spectra of the Type Ia supernova (SN Ia) 2016brx, a member 1991bg-like subclass that lies at faint end SN luminosity function. Nebular are available for only three other SNe, and their Co line centers all within <~ 500 km/s each other. In contrast, nebular center 2016brx is blue-shifted by >1500 compared to them ~1200 rest frame. This significant shift relative narrow velocity dispersion 2000 these SNe. The large range shifts implies Ni56 in ejecta events off-center...