Estos son los seminarios y eventos que han pasado por nuestro Centro Astronómico, revisa aquí los temas y quienes han sido los académicos que presentaron sus investigaciones e ideas los temas más relevantes.

The Process of Planning and Implementing SDSS-V projects in the era of robotic Focal Plane System (FPS)

The Sloan Digital Sky Survey has recently reached its fifth generation SDSS-V which consists of the projects Milky Way Mapper (MWM), Black Hole Mapper (BHM), and Local Volume Mapper (LVM). The main difference of this generation is the use of Fiber Positioner System (FPS).
Felipe Santana
Departamento de Astronomía, Universidad de de Chile
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Planetary remnants around white dwarfs

White dwarfs are the final fate of 95 per cent of all stars, including our Sun. Planets and planetary bodies that survived thismetamorphosis of their host star can venture close to the left-over stellar cores (i.e. white dwarf) where tidal force results in their disruption.
Odette Toloza
Núcleo Milenio de Formación Planetaria
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Desafíos en Investigación del Programa Científico Nacional en Antártica

El Programa Científico Nacional en Ciencia Antártica (PROCIEN) debe de enfrentar los profundos cambios que esta experimentando la Península Antártica en cuanto a las amenazas del cambio climático, la presión de la pesca, el aumento del turismo y las posibilidades de explotar sus biorecursos, como una industria verde. Los desafíos de la ciencia chilena antártica son los relativos al estudio y comprensión del entorno polar en un escenario de cambio climático, sus dimensiones físicas y biológicas, su pasado y presente, y la modelación de los escenarios futuros. A ello ha sumado los estudios sociales y de las humanidades para comprender la identidad antártica nacional en sus diversas expresiones y contextos. Así, el PROCIEN mantiene siete líneas de estudio, enmarcadas dentro de las prioridades señaladas por el Comité Científico de Investigación Antártica (SCAR), pero igualmente teniendo en cuenta las ventajas comparativas geopolíticas y el interés nacional.
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Exploring planet formation across the stellar mass range

In recent years ALMA imaging of protoplanetary discs has revealed a broad and beautiful range of structures and morphologies alerting us to the underlying mechanisms of planet formation. Despite this variety, we can identify some trends that begin to reveal to us the nature of planet formation, one such trend is with the mass of the stellar host. In this seminar I will present results from my work that uses the structure, evolution and mass of protoplanetary discs to study how the mechanisms of planet formation differ depending on the stellar host. Mass of the central object is linked to the mass of the planet-building material, the size of the disc, and observational results suggest a link to disk lifetime as well. Furthermore, the evolution of stellar luminosity during the disc-hosting phase alters disc mid-plane temperature suggesting temporal variations of disc composition for any given orbital radius in the disc. I will present modelling of protoplanetary discs using self-consistent calculations of mid-plane temperature that suggest a dichotomy in the temperature, and subsequently the composition, of disc mid-planes around low and intermediate mass stars. Applying this modelling to the HR8799 planetary system, we can explore what constraints can be placed on both where and when giant planets in the system may have formed.
James Miley
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GAIA GROUND BASED OPTICAL TRACKING :What we learnt about digital astrometry of moving objects

The Gaia satellite (ESA) evolves on a Lissajous orbit around the Sun-Earth L2 Lagrangian Point. To fully achieve the scientific objectives of the mission, and to completely eliminate effects such as aberration, the daily position and velocity vectors of the spacecraft have to be known to an accuracy respectively greater than 20 mas and 2.5mm/s. As these accuracies can not be reached by traditional techniques of spacecraft tracking (in particular in the normal plane to the line of sight) a Ground Based Optical Tracking (GBOT) of the satellite has been adopted. In this framework, we carried out a theoretical study with the aim of proving the feasibility of the GBOT project and optimizing the observational strategy by characterizing the astrometric precision limit for moving targets observed with digital-array detectors (Bouquillon et al, A&A 2017). This research led to useful results for planning astrometric observation of all kinds of moving bodies as meteors, satellites, space debris or asteroids.
Sebastien Bouquillon
FCLA/DAS and Paris Observatory
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Early galaxy formation & its large-scale effects

Galaxy formation in the first billion years mark a time of great upheaval in the history of the Universe: as the first sources of light, these galaxies ended the 'cosmic dark ages' and produced the first photons that could break apart the hydrogen atoms suffusing all of space starting the process of cosmic reionization. As the earliest building blocks, the galaxies that formed in the first billion years also determine the physical properties of all subsequent galaxy populations. However fully coupling galaxy formation with large-scale reionization remains a massive computational challenge as a result of the range in (mass and volume) scales required. I will start by introducing the Astraeus framework that is the largest (230 Mpc box) and most highly resolved (DM resolution mass of 10^6.9 solar masses) simulation to fully couple a semi-analytic model of galaxy formation with a semi-numerical scheme for reionization (feedback) to shed light on galaxy formation at cosmic dawn. I will then show how cross-correlations of 21cm data with the underlying galaxy population, in the forthcoming era of 21cm cosmology, will yield tantalizing constraints on the average intergalactic medium ionization state as well as the reionization topology (outside-in versus inside-out). Finally, I will try to give a flavour of how the assembly of early galaxies, accessible with the forthcoming James Webb Space Telescope, can provide a powerful testbed for Dark Matter models beyond "Cold Dark Matter".
Pratika Dayal
Kapteyn Astronomical Institute, The University of Groningen
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