Thallis Pessi
A5031899746- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Neutrino Physics Research
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Mechanics and Biomechanics Studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Healthcare and Venom Research
- Phytoestrogen effects and research
- Traditional Chinese Medicine Studies
European Southern Observatory
2023-2024
Diego Portales University
2021-2023
Universidade Federal de Santa Maria
2021
ABSTRACT We report the discovery of closest known black hole candidate as a binary companion to V723 Mon. Mon is nearby ($d\sim 460\, \rm pc$), bright (V ≃ 8.3 mag), evolved (Teff, giant 4440 K, and Lgiant 173 L⊙) red in high mass function, f(M) = 1.72 ± 0.01 M⊙, nearly circular (P 59.9 d, e 0). variable star, previously classified an eclipsing binary, but its All-Sky Automated Survey, Kilodegree Extremely Little Telescope, Transiting Exoplanet Survey Satellite light curves are those edge-on...
Context. We present an analysis of very early high-resolution spectroscopic observations the Type II supernova (SN) 2024ggi, a nearby SN that occurred in galaxy NGC 3621 at distance 7.24 Mpc ( z ≈ 0.002435). These represent earliest spectra ever made. Aims. analyzed early-phase evolution 2024ggi obtained short interval 20.6 and 27.8 h after its discovery, or 26.6 33.8 first light. Observations were with spectrograph MIKE R 22 600 − 28 000) 6.5 m Magellan Clay Telescope, located Las Campanas...
Abstract We present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, AT 2022aedm, detected by Asteroid Terrestrial impact Last Alert Survey (ATLAS). In ATLAS o band, 2022aedm exhibited rise time 9 ± 1 days, reaching luminous peak with M g ≈ −22 mag. It faded 2 mag in band during next 15 days. These timescales are consistent other rapidly evolving transients, though luminosity is extreme. Most surprisingly, host galaxy massive elliptical negligible...
Abstract We present optical follow-up imaging obtained with the Katzman Automatic Imaging Telescope, Las Cumbres Observatory Global Telescope Network, Nickel Swope and Thacher of LIGO/Virgo gravitational wave (GW) signal from neutron star–black hole (NSBH) merger GW190814. searched GW190814 localization region (19 deg 2 for 90th percentile best localization), covering a total 51 94.6% two-dimensional region. Analyzing properties 189 transients that we consider as candidate counterparts to...
ABSTRACT We catalogue the 443 bright supernovae (SNe) discovered by All-Sky Automated Survey for Supernovae (ASAS-SN) in 2018−2020 along with 519 SNe recovered ASAS-SN and 516 additional mpeak ≤ 18 mag missed ASAS-SN. Our statistical analysis focuses primarily on 984 or g-band observations. The complete sample of 2427 includes earlier V-band samples unrecovered SNe. For each SN, we identify host galaxy, its UV to mid-IR photometry, SN’s offset from centre host. Updated peak magnitudes,...
Context. The analysis of core-collapse supernova (CCSN) environments can provide important information on the life cycle massive stars and constrain progenitor properties these powerful explosions. MUSE instrument at Very Large Telescope (VLT) enables detailed local environment constraints progenitors large samples CCSNe. Using a homogeneous SN sample from All-Sky Automated Survey for Supernovae (ASAS-SN) survey, an untargeted spectroscopically complete transient has enabled us to perform...
In recent years, many Type IIn supernovae have been found to share striking similarities with the peculiar SN 2009ip, whose true nature is still under debate. Here, we present 10 years of observations 2011fh, an interacting transient spectroscopic and photometric 2009ip. 2011fh had a M$_r \sim -16$ mag brightening event, followed by brighter -18$ luminous outburst in August 2011. The spectra are dominated narrow intermediate Balmer emission lines throughout its evolution, P Cygni profiles...
Type IIn supernovae occur when stellar explosions are surrounded by dense hydrogen-rich circumstellar matter. The matter is likely formed extreme mass loss from their progenitors shortly before they explode. nature of supernova and the mass-loss mechanism forming still unknown. In this work, we investigate whether properties local environments correlated. We use with well-observed light curves host-galaxy integral field spectroscopic data so that can estimate both environmental properties....
Context. The peculiar supernova (SN) 2009ip was an ambiguous event that placed many questions on its true origin. Here, we present very late-time spectroscopic and photometric observations of SN 2009ip, obtained 9 years (3274 days) after the 2012B outburst. Aims. We analyze H α emission still in spectrum 2009ip. also obtain measurements r , g i bands. Methods. 2021 September 10 with IMACS instrument at 6.5 m Magellan Baade Telescope, located Las Campanas Observatory. Results. detected bands,...
Abstract Core-collapse supernovae (CCSNe) are widely accepted to be caused by the explosive death of massive stars with initial masses ≳8 M ⊙ . There is, however, a comparatively poor understanding how properties progenitors—mass, metallicity, multiplicity, rotation, etc.—manifest in resultant CCSN population. Here, we present minimally biased sample nearby CCSNe from All-Sky Automated Survey for Supernovae survey whose host galaxies were observed integral-field spectroscopy using MUSE at...
We present an analysis of very early high-resolution spectroscopic observations the nearby core-collapse (CC) supernova (SN) 2024ggi, a Type II SN that ocurred in galaxy NGC 3621, at distance 7.11 Mpc ($z\approx0.002435$). These represent earliest spectroscopy CCSN ever made. analyze early-phase evolution 2024ggi obtained short interval 26.6 and 33.8h after first light. Observations were with spectrograph MIKE ($R\approx22600-28000$) 6.5m Magellan Clay Telescope, located Las Campanas...
SN 2023tsz is a Type Ibn supernova (SNe Ibn) discovered in an extremely low-mass host. SNe are uncommon subtype of stripped-envelope core-collapse SNe. They characterised by narrow helium emission lines their spectra and believed to originate from the collapse massive Wolf-Rayet (WR) stars, though progenitor systems still remain poorly understood. In terms energetics spectrophotometric evolution, largely typical example class, although line profile asymmetries nebular phase seen, which may...
Abstract SN 2023tsz is a Type Ibn supernova (SNe Ibn), an uncommon subtype of stripped-envelope core-collapse SNe, discovered in extremely low-mass host. SNe are characterised by narrow helium emission lines their spectra and believed to originate from the collapse massive Wolf-Rayet (WR) stars, though progenitor systems still remain poorly understood. In terms energetics spectrophotometric evolution, largely typical example class, although line profile asymmetries nebular phase seen, which...
Type IIn supernovae occur when stellar explosions are surrounded by dense hydrogen-rich circumstellar matter. The matter is likely formed extreme mass loss from their progenitors shortly before they explode. nature of supernova and the mass-loss mechanism forming still unknown. In this work, we investigate if there any correlations between properties local environments. We use with well-observed light-curves host-galaxy integral field spectroscopic data so that can estimate both...
The analysis of core-collapse supernova (CCSN) environments can provide important information on the life cycle massive stars and constrain progenitor properties these powerful explosions. MUSE instrument at VLT enables detailed local environment constraints progenitors large samples CCSNe. Using a homogeneous SN sample from ASAS-SN survey has enabled us to perform minimally biased statistical CCSN environments. We analyze 111 galaxies observed by that hosted 112 CCSNe detected or discovered...
Core-collapse supernovae (CCSNe) are widely accepted to be caused by the explosive death of massive stars with initial masses $\gtrsim 8$M$_\odot$. There is, however, a comparatively poor understanding how properties progenitors -- mass, metallicity, multiplicity, rotation etc. manifest in resultant CCSN population. Here we present minimally biased sample nearby CCSNe from ASAS-SN survey whose host galaxies were observed integral-field spectroscopy using MUSE at VLT. This dataset allows us...
We present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, AT2022aedm, detected by Asteroid Terrestrial impact Last Alert Survey (ATLAS). AT2022aedm exhibited rise time $9\pm1$ days in ATLAS $o$-band, reaching luminous peak with $M_g\approx-22$ mag. It faded 2 magnitudes $g$-band during next 15 days. These timescales are consistent other rapidly evolving transients, though luminosity is extreme. Most surprisingly, host galaxy massive elliptical...
The peculiar supernova (SN) 2009ip is an ambiguous event that spurred many questions regarding its true origins. Here, we present very late-time spectroscopic and photometric observations of SN 2009ip, obtained 9 years (3274 days) after the 2012B outburst. We analyze H$\alpha$ emission still in spectrum 2009ip. also obtain measurements $r$, $g,$ $i$ bands. on 2021 September 10 with IMACS instrument at 6.5 m Magellan Baade Telescope, located Las Campanas Observatory. was detected bands,...
Thanks to the mid-infrared capability offered by Spitzer, systematic searches of dust in SNe have been carried out over past decade. Studies revealed presence a substantial amount broad range SN subtypes. How normal present mid-IR excess at later time and turn be dusty can affected several factors, such as mass-loss history envelope structure progenitors their explosion environment. All these combined related environmental properties. A analysis that exploded under environment could critical...