56 citations · 108 across the 17 of their papers we have counts for
17 papers
A Quantitative Method to Investigate the Spectral Class Time Evolution of Novae
Maria Kopsacheili, Martín Guerrero, Diego Alejandro Vasquez Torres
Novae are spectroscopically classified as Fe II or He/N according to the dominance of Fe II, or He and N emission lines in their pre-nebular spectra, while spectra exhibiting both…
The type Ia supernova 2023vjh: a peculiar 1991bg-like SN with unusually faint light curves
M. Kopsacheili, L. Galbany, G. Folatelli +32
We present observations of the 1991bg-like type Ia supernova (SN) 2023vjh, associated with the elliptical galaxy MCG+04-10-013. Its light-curve shape parameters ($Δm_{15}(B)=1.89 \…
A systematic meta-analysis of physical parameters of Galactic supernova remnants
I. Chousein-Basia, A. Zezas, I. Leonidaki +1
Supernova remnants (SNRs) are the aftermath of massive stellar explosions or of a white dwarf in a binary system, representing critical phases in the life cycle of stars and playin…
New X-ray Supernova Remnants in NGC 7793
Maria Kopsacheili, Konstantina Anastasopoulou, Nanda Rea +2
This work focuses on the detection of X-ray Supernova Remnants (SNRs) in the galaxy NGC 7793 and the study of their properties. X-ray SNRs in galaxies beyond the Local Group are ra…
Observational diversity of bright long-lived Type II supernovae
T. Nagao, T. M. Reynolds, H. Kuncarayakti +21
In various types of supernovae (SNe), strong interaction between the SN ejecta and circumstellar material (CSM) has been reported. This raises questions on their progenitors and ma…
Rapid follow-up observations of infant supernovae with the Gran Telescopio Canarias
Lluís Galbany, Claudia P. Gutiérrez, Lara Piscarreta +21
The first few hours of a supernova (SN) contain significant information about the progenitor system. The most modern wide-field surveys that scan the sky repeatedly every few days…
The fast rise of the unusual Type IIL/IIb SN 2018ivc
A. Reguitti, R. Dastidar, G. Pignata +22
We present an analysis of the photometric and spectroscopic dataset of the Type II supernova (SN) 2018ivc in the nearby (10 Mpc) galaxy Messier 77. Thanks to the high cadence of th…
Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc
A. Gkini, C. Fransson, R. Lunnan +47
We present photometric and spectroscopic observations of SN 2020xga and SN 2022xgc, two hydrogen-poor superluminous supernovae (SLSNe-I) at and , respectiv…
Supernova Remnant properties and Luminosity Functions in NGC 7793 using MUSE IFS
Maria Kopsacheili, Cristina Jiménez-Palau, Lluís Galbany +2
In this study we use MUSE Integral Field Spectroscopy (IFS), along with multi-line diagnostics, for the optical identification of Supernova Remnants (SNRs) in the galaxy NGC 7793.…
Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) I. Showcase sample and first results
R. González-Díaz, F. F. Rosales-Ortega, L. Galbany +6
We present the Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) project, designed for the spatial and spectral study of the diffuse ionised gas (DIG) in a sele…
AT2022aedm and a new class of luminous, fast-cooling transients in elliptical galaxies
M. Nicholl, S. Srivastav, M. D. Fulton +49
We present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, AT2022aedm, detected by the Asteroid Terrestrial impact Last Alert Survey (ATLAS).…
First optical identification of the SRG/eROSITA-detected supernova remnant G 116.6-26.1 I. Preliminary results
E. V. Palaiologou, I. Leonidaki, M. Kopsacheili
The supernova remnant (SNR) candidate G 116.6-26.1 is one of the few high Galactic latitude () remnants detected so far in several wavebands. It was discovered recently…
Optical emission-line Luminosity Function models for populations of Supernova Remnants
M. Kopsacheili, A. Zezas, I. Leonidaki
We present a basic model for the calculation of the luminosity distribution of supernova remnant populations. We construct theoretical Ha and joint [S II] - Ha luminosity functions…
Deep optical study of the mixed-morphology supernova remnant G 132.7+1.3 (HB3)
P. Boumis, A. Chiotellis, V. Fragkou +8
We present optical ccd images of the large supernova remnant (SNR) G132.71.3 (HB3) covering its full extent for the first time, in the emission lines of H[N II], [S II] and…
The Supernova Remnant Populations of the galaxies NGC 45, NGC 55, NGC 1313, NGC 7793: Luminosity and Excitation Functions
M. Kopsacheili, A. Zezas, I. Leonidaki +1
We present a systematic study of the Supernova Remnant (SNR) populations in the nearby galaxies NGC 45, NGC 55, NGC 1313, and NGC 7793 based on deep Ha and [S II] imaging. We find…
A diagnostic tool for the identification of Supernova Remnants
M. Kopsacheili, A. Zezas, I. Leonidaki
We present new diagnostic tools for distinguishing supernova remnants (SNRs) from HII regions. Up to now, sources with flux ratio [S II]/H higher than 0.4 have been considere…
The circumstellar environment of pre-SN Ia systems
E. Harvey, M. P. Redman, P. Boumis +4
Here we explore the possible preexisting circumstellar debris of supernova type Ia systems. Classical, symbiotic and recurrent novae all accrete onto roughly solar mass white dwarf…