Início » Educação & Divulgação » Webinars » 2022
29/09 - 10:00 am
Elisa Maria Alessi
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Elisa Maria Alessi
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Natural perturbations as allies to design deorbiting solutions to mitigate the space debris problem. (Istituto di Matematica Applicata e Tecnologie Informatiche)
Abstract
The aim of this presentation is to introduce the problem of space debris and the actions that the worldwide community is taking to mitigate it. I will focus in particular on the role of end-of-life disposal strategies and how natural perturbations and advanced mathematical tools can help to design orbital solutions to preserve the orbital regions around the Earth.
09/06 - 11:00 am
Susana Barros
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Susana Barros
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Tidal deformation and tidal decay of WASP-103c (Instituto de Astrofísica e Ciências do Espaço)
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Tidal forces between short-period planets and their host stars are extreme. These lead to the deformation of the planet and the shrinkage of the planet’s orbit. Using the new ESA mission CHEOPS we are attempting to measure both these effects for a sample of exoplanets. Measuring the tidal deformation of the planet would allow us to estimate the second degree fluid Love number and gain insight into the planet\\\\\\\'s internal structure. Measuring the tidal decay timescale would allow us to estimate the stellar tidal quality factor, which is key to constraining stellar physics. WASP-103 was our first since it had the largest estimated signature of the tidal deformation. I will present the first detection of the tidal deformation of a planet directly from its light curve. This allowed us to measure the Love number of WASP-103b. We also found a hint that the orbital period of WASP-103b is increasing contrary to what is expected from tidal decay. I will explore the scenarios that could explain these observations.
26/05 - 02:00 pm
Sierra Villarreal
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Sierra Villarreal
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Extreme Scale Image Simulation Workflows for LSST DESC (Argonne National Laboratory)
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19/05 - 09:00 am
Véronique Buat
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Véronique Buat
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Dust and stars: an unavoidable and complex interplay (Laboratoire d’Astrophysique de Marseille)
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17/03 - 11:00 am
Niel Brandt
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Niel Brandt
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A Good Hard Look at Cosmic Supermassive Black-Hole Growth (The Pennsylvania State University )
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The 7 Ms Chandra X-ray Observatory exposure on the Chandra Deep Field-South (CDF-S) has provided the most sensitive extragalactic X-ray survey by a wide margin. About 1050 X-ray sources have been detected, primarily distant active galactic nuclei (AGNs) and starburst/normal galaxies. The unmatched deep multiwavelength coverage for these sources allows superb follow-up investigations, revealing the details of supermassive black-hole growth over most of cosmic time. I will briefly describe the sources in the 7 Ms CDF-S and highlight some exciting science results. The latter will include (1) measurements of long-term black-hole growth informed by galaxy morphological and physical measurements; (2) constraints upon black-hole growth in the first galaxies as revealed by direct detection and stacking; and (3) the discovery of representatives of a new population of faint, fast X-ray transient sources. Finally, I will discuss some future prospects for X-ray surveys of AGNs in the distant universe, including the recently completed 5 Ms XMM-SERVS survey of the LSST Deep Drilling Fields and new X-ray missions.
Slides not available
10/03 - 02:00 pm
Kyle Dawson
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Kyle Dawson
Title
The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory (University of Utah)
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The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) concluded observations of the cosmic distance scale and the growth of structure in February, 2019. The three dimensional clustering in all samples from the Sloan Digital Sky Survey (SDSS) was used to make 15 distinct, high precision measurements of Baryon Acoustic Oscillations (BAO) to an effective redshift z<2.4 and six measurements of redshift space distortions (RSD) to z<1.5. With this redshift coverage and sensitivity, the SDSS experiment is unparalleled in its ability to explore models of dark energy. Using available cosmological samples, we provide new constraints on the cosmological model with an emphasis on the role of the final BAO and RSD clustering measurements in advancing the cosmological model. In this talk, I will give a brief overview of the BAO and RSD measurements and present the highlights of the advances in modeling dark energy, the local expansion rate, tests of general relativity, neutrino masses, and the overall cosmological model.
10/02 - 11:00 am
Michelle Lochner
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Michelle Lochner
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Anomaly Detection in Astronomical Data using Machine Learning (University of the Western Cape)
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The next generation of telescopes such as the SKA and the Vera C. Rubin Observatory will produce enormous data sets, far too large for traditional analysis techniques. Machine learning has proven invaluable in handling large data volumes and automating many tasks traditionally done by human scientists. In this talk, I will discuss how machine learning for anomaly detection can help automate the process of locating unusual astronomical objects in large datasets thus enabling new cosmic discoveries. I will introduce Astronomaly, a general purpose framework for anomaly detection in astronomical data using active learning and overview some recent results.