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Bernardo Fraga (CBPF)5/6/24, 10:00โฏAM
The upcoming Vera Rubin observatory and its Legacy Survey of Space and Time (LSST) are expected to detect of the order of ten million alerts per night, which are then distributed to community brokers whose task is to filter, classify and redistribute this data to selected scientific communities. Due to the sheer amount of data, machine learning (ML) algorithms are expected to play a key role...
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Mrs Lilianne Nakazono (IAG-USP)5/6/24, 10:55โฏAM
Almost all astronomical transients are hosted by a galaxy. Hostless transients are rare and have been associated with events that probe the extremes of physical mechanisms. Early identification based on their hostless characteristics would allow rapid follow-up and consequently better datasets for modelling and interpretation. Most apparently hostless events are not in fact hostless but their...
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Julius Hrivnac (IJCLab)5/6/24, 11:20โฏAM
This presentation introduces an innovative approach for the storage, organization, access, analysis, and visualization of Fink data. Rather than treating Fink data as isolated entities, we propose representing it as a graph of interconnected objects, comprising sources and alerts. This novel organization enables the capture of important collective features, providing a simple and intuitive...
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Dr Swayamtrupta Panda (Laboratorio Nacional de Astrofisica, Itajuba)5/6/24, 11:45โฏAM
Active Galactic Nuclei (AGN) are variable sources, and analyzing the time delay of the strong broad optical emission lines relative to the underlying continuum serves as a crucial tool to investigate this important trait. This method aids in measuring black hole masses, and deciphering the structure of the Broad Line Region (BLR) responsible for these emission lines, which can be extended to...
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Mr Joao Paulo Franca (CBPF)5/6/24, 2:30โฏPM
Strong lensing time-delays provide an independent method for measuring $H_0$ and probing cosmology. Although multiply imaged transients are very rare, ongoing and upcoming projects in wide-field surveys are expected to discover thousands of such systems, especially in the Vera Rubin Observatory Legacy Survey of Space and Time (LSST) survey. As a preparation for this unprecedented amount of...
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Dr Stefan Schuldt (University of Milan)5/6/24, 2:55โฏPM
Thanks to the large sky coverage and the high cadence, the Rubin Observatory Legacy Survey of Space and Time (LSST) will reveal on the order of 100,000 strongly lensed galaxy-scale systems and revolutionize transient studies. With dedicated neural network classifiers trained on realistic mock images, we will be able to analyze all LSST images, and detect these lens candidates. By...
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Ms Andre Santos (CBPF)5/7/24, 9:30โฏAM
Astronomical transients refer to objects in the sky not present in previously acquired data and have a finite amount of time visible in the sky. Time domain astronomy studies the dynamic sky, focusing on discovering and characterizing those transients, helping understand the physics and evolution of the sources and their surrounding environment. The S-PLUS Transient Extension Program (STEP) is...
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Dr Guillermo Cabrera (Universidad de Concepciรณn)5/7/24, 9:55โฏAM
ALeRCE (http://alerce.science/) is an alert annotation and classification system led by an interdisciplinary and interinstitutional group of scientists based in Chile. ALeRCE focuses primarily on transients, variable stars, and stochastic sources. Thanks to its state-of-the-art machine learning models, ALeRCE has become the third-leading contributor in reporting candidates to the Transient...
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Roman Le Montagner5/7/24, 10:45โฏAM
With the advent of optical large-scale astronomical surveys such as the Zwicky Transient Facility (ZTF) or the upcoming Vera C. Rubin Observatory, the number of alerts generated by transient, variable, and moving objects is skyrocketing to millions per night. To handle this influx, the processing of alerts has been delegated to the alert broker such as Fink, which identifies and classifies...
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Mr Phelipe Antonie Darc de Matos (CBPF)5/7/24, 11:10โฏAM
Kilonovae are a class of astronomical transients observed as counterparts to mergers of compact binary systems, such as a binary neutron star (BNS) or black hole-neutron star (BHNS) inspirals. They serve as probes for heavy-element nucleosynthesis in astrophysical environments, while together with gravitational wave emission constraining the distance to the merger itself, they can place...
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Dr Juan Carlos Rodriguez Ramirez (CBPF)5/7/24, 11:30โฏAM
Time-domain surveys, such as DECam, ZTF, and the forthcoming Vera Rubin Telescope, open new possibilities for discovering explosive transients in our Universe. Optical flares, in particular, have been widely considered as potential counterparts to gravitational waves measured by the LIGO-Virgo-KAGRA Collaboration (LVK). While binary black hole (BBH) mergers dominate the population of...
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Mr Vitor Ramos (CBPF)5/8/24, 9:30โฏAM
Strong Lensing is a phenomenon predicted by Einsteinโs General Relativity in which the light emitted by a distant source is deflected by a massive object in its path, causing the image of the distant object to appear magnified and distorted. This process carries information about the dark matter distribution and the underlying cosmology in galaxies and galaxy clusters, making Strong Lensing a...
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Ms Mariana Bittencourt (UFF / CBPF)5/8/24, 9:50โฏAM
In astronomy, transients are a source of new discoveries about the universe. Kilonovae are a type of transient resulting from the collision between neutron stars or between a neutron star and a black hole in compact binary systems, and currently, it is the only object with electromagnetic and gravitational wave counterparts (GW170817). As we navigate in the Big Data era, and expect the...
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Helen Qu (University of Pennsylvania)5/8/24, 10:10โฏAM
The discovery of the accelerating expansion of the universe has led to increasing interest in probing the nature of dark energy. As very bright standardizable candles, type Ia supernovae (SNe Ia) are used to measure precise distances on cosmological scales and thus have been instrumental to this effort. Building a robust dataset of SNe Ia across a wide range of redshifts will allow for the...
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Dr Isabel de Jesus Lima (Unesp)5/8/24, 11:00โฏAM
Pre-polars are detached binary systems composed by a magnetic white dwarf (WD) accreting matter by the capture of the stellar wind of a cool donor, usually a late-type main sequence star. These systems can be the progenitors of polars, which is a subclass of magnetic cataclysmic variable consisting of a Roche Lobe filling low-mass companion star and a strongly magnetized WD. Nowadays the...
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Mr Gabriel Teixeira (CBPF)5/9/24, 9:30โฏAM
Red supergiants (RSGs) stars are a stage of the life cycle of a massive star, with mass greater than 8 times the mass of the Sun. At the end of their lives, these stars either explode as supernovae or collapse directly into black holes. Having an efficient alert system allows us to infer the fundamental properties of the supernova progenitor star, that are contained mostly in the early phases...
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Ms Cassia Nascimento (UFRJ)5/9/24, 9:50โฏAM
We present a light curve fitter for type Ia Supernovae dubbed Pure Expansion Template for Supernovae (PETS). The model consists of an expansion of its rest-frame flux based on the well-known Spectral Adaptive Light Curve Template 2 (SALT2). We generate the expansion components by performing Principal Component Analysis (PCA) and Factor Analysis (FA) onto a representative training set. Then, we...
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Mr Jaemyoung (Jason) Lee (University of Pennsylvania)5/9/24, 10:10โฏAM
Differential Chromatic Refraction (DCR) is caused by the wavelength dependence of our atmosphere's refractive index that shifts the apparent positions of stars and galaxies and distorts their shapes depending on their spectral energy distribution (SED). While this effect is typically mitigated and corrected for in imaging observations, we investigate how DCR can instead be used to our...
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Dr Leandro Almeida (Laboratรณrio Nacional de Astrofรญsica)5/9/24, 11:30โฏAM
The identification and characterization of exoplanets have surpassed 5000 celestial bodies, by using various techniques, such as the transit method, which depends on the periodic transits caused by the planet passing in front of the star, and the radial velocity method which relies on the oscillations in absorption line positions in stellar spectra. Each technique has specific advantages; the...
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Dr Beatriz Siffert (UFRJ)
Since the discovery of the first planets outside the Solar System, in the beginning of the 90's, various new techniques, dedicated programs and space missions have been conceived to find new exoplanets and characterizing the known ones. Nowadays, we know more than 5500 exoplanets, a number which might sound low if we consider that more than 30 years have passed and the amount of effort...
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Dr Luidhy Santana-Silva (CBPF)
The detection of gravitational wave (GW) events from neutron star mergers provides a unique opportunity to study their electromagnetic counterparts and identify the associated host galaxy. In particular, short $\gamma$-ray burst (sGRB) are pointed as a possible electromagnetic counterpart of GW. This study aims to identify typical morphological properties of sGRB host galaxies to better...
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Dr Juan Carlos Rodriguez Ramirez (CBPF)
Time-domain surveys, such as DECam, ZTF, and the forthcoming Vera Rubin Telescope, open new possibilities for discovering explosive transients in our Universe. Optical flares, in particular, have been widely considered as potential counterparts to gravitational waves measured by the LIGO-Virgo-KAGRA Collaboration (LVK). While binary black hole (BBH) mergers dominate the population of...
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Sunil Chandra (South African Astronomical Observatory Cape Town South Africa)
Abstract The Observatory Control System (OCS), a comprehensive software package developed by Las Cumbres Observatory (LCO), helps automate a number of important steps related to the robotic operations of an optical observatory. For example, managing the configuration database of telescopes, instruments, and components, observation submission and scheduling, handling various alerts, etc. The...
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