Seminarios científicos impartidos por científicos y tecnólogos del IAA y de los muchos centros e instituciones de investigación que nos visitan. Muestra del intenso intercambio científico, se celebra a las 12:30 de cada jueves. Los seminarios se retransmiten en directo en IAA - CSIC Seminars Live.

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201 - 250 de un total de 1137


29/11/2018 - 12:30
Spirals, rings and arcs around evolved stars
We searched the complete archive of the HST and Spitzer to characterise rings and arcs around evolved low-mass stars (AGB stars, proto-PNe and PNe), study their physical properties and address their formation mechanisms. In this talk, we present the observational results of our survey, the predictions of simple radiation-hydrodynamic simulations as well as the future of the project.
Dr. Jesús Toala
Instituto de Radioastronomía y Astrofísica IRyA - UNAM Campus Morelia, México.
22/11/2018 - 12:30
Time variable processes of Sagittarius A*, the massive black hole at the centre of the Milky Way
Date: 22/11/2018 . 12:30 hrs Speaker: Dr. Gunther Witzel Affiliation: Max-Planck-Institute for Radioastronomy, Bonn, Germany.
Dr. Gunther Witzel
Max-Planck-Institute for Radioastronomy, Bonn, Germany.
15/11/2018 - 12:30
The habitability of stagnant-lid Earths around dwarf stars
We show that Earth-like stagnant-lid planets allow for habitable surface conditions within a continuous habitable zone that is dependent on interior composition.
Dra. Mareike Godolt
Centre of Astronomy and Astrophysics, University of Technology in Berlin, Germany
08/11/2018 - 12:30
What we (don't) know about the trans-Neptunian objects
The first trans-Neptunian object was discovered in 1930 and we waited over 60 years to discover the second one. The discovery of Albion (a.k.a. 1992QB1) enticed the minor bodies community to characterize the new population, called collectively as trans-Neptunian objects (TNOs). Today we know the existence of over 2,000 objects and counting. Nevertheless, it seems that we have reached our technological limitation in terms of observational studies...
Dr. Alvaro Alvarez-Candal
Observatorio Nacional de Rio de Janeiro, Brasil.
25/10/2018 - 12:30
The Arp299B-AT1 puzzle: First resolved imaging of a tidal disruption event
Date: 25/10/2018 . 12:30 hrs Speaker: Dr. Miguel Angel Pérez-Torres Affiliation: IAA-CSIC, Spain
Dr. Miguel Angel Pérez-Torres
18/10/2018 - 12:30
An unusual autumn Elevated Stratopause Event (ESE)
IAA Seminar Date: 18/10/2018 . 12:30 hrs Speaker: Dr. Maya Garcia Comas
Dr. Maya García Comás
11/10/2018 - 12:30
The planetary nebula HuBi 1, a rebel with a cause
Planetary nebulae, the descendants of low- and intermediate-mass stars, have characteristic onion-like ionization structure, with the highest ionization species closer to the central star. This is true for all planetary nebulae, but HuBi 1, which shows an inverted ionization inner shell. There is a reason for this oddity, a peculiar stellar evolution of its central star, which makes HuBi 1 the missing link of the population of cool C-rich...
Dr. Martin Guerrero
04/10/2018 - 12:30
The European VLBI Network (EVN) and user cases to improve your science
The European VLBI Network (EVN) is a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa and Puerto Rico. The combination of such extended network of telescopes provides an extremely high angular resolution (down to milliarcsecond scales). In addition to that, and given its unparalleled sensitivity on this type of observations, the EVN becomes a genuine instrument to observe an enormous...
Dr. Benito Marcote
JIVE, the Joint Institute for VLBI ERIC, Dwingeloo, the Netherlands
27/09/2018 - 12:30
ASKAP and HI in Galaxies
I will divide my talk into three parts, starting with an overview of CSIRO’s Australia Telescope National Facility (ATNF), especially our telescopes (ASKAP...
Baerbel Koribalski
CSIRO Astronomy & Space Science Australia Telescope National Facility (ATNF), Australia
20/09/2018 - 12:30
Slender CaiiH fibrils observed by SUNRISE II
The special observing conditions of the SUNRISE observatory allow obtaining observations in the UV with unprecedented temporal stability and spatial resolution. On its second scientific flight, the Sunrise Filter Imager (SUFI) was used to record a time series of narrow-band intensity images in the CaiiH line for approximately one hour at a cadence of 7 seconds. This unique dataset enabled us to characterize the morphological properties of 598...
Dr. Ricardo Gafeira
13/09/2018 - 12:30
The peculiar case of the active galactic nuclei in PBC J2333.9-2343
Under unification schemes, active galactic nuclei (AGN) can be explained by orientation effects. However, some sources show properties at different frequencies that led to incongruent classifications and cannot be explained by such unification scheme. This is the case of PBC J2333.9-2343; its optical spectrum is of a type 2 AGN but its X-ray spectrum does not show signs of absorption, and in the radio it has many features typical of a blazar but...
Dr. Lorena Hernández-García
Universidad de Valparaiso, Chile
06/09/2018 - 12:30
Optical spectroscopy of local type-1 AGN LINERs
The Balmer emission originated in the broad line region (BLR) of active galactic nuclei (AGNs) could be either weak and difficult to detect, or even absent, for low luminosity AGNs, as low ionization nuclear emission-line regions (LINERs). This makes LINERs challenging to fit in the AGN unification scheme. Moreover, a long debate can be found in the literature proposing different ionization sources at the origin of optical emission lines and no...
Dr. Sara Cazzoli
28/06/2018 - 12:30
Extreme quasars at high redshift
The study of the AGN accreting close to the Eddington limit (L/LEdd~1) has taken an important role, due to their potential use as standard candles for cosmological applications. With the purpose to understand the physics of extreme quasar, we perform a spectroscopic analysis of a sample of highly accreting quasars at high redshift (z~2–3). Our sample were observed with the OSIRIS spectrograph on the GTC 10.4 m telescope located at the...
Dr. Maryloli Martinez Aldama
22/06/2018 - 12:30
What do environments can tell us about supernovae?
The advent of Integral Field Spectroscopy (IFS) applied to supernova (SN) environmental studies have shown the potential of this technique to directly characterize the galactic environmental parameters at SN locations, compare them to those at different locations of the galaxy, and put constraints on progenitor stars for different SN types. Here, I will summarize past works and present on­going efforts, including the PISCO compilation and the...
Dr. Luis Galbany
University of Pittsburg, EEUU
21/06/2018 - 12:30
Blazar Science with POLAMI: Polarimetric Monitoring of AGN at Millimeter Wavelengths
A pioneering long term program at the IRAM 30m Telescope dubbed POLAMI (Polarimetric Monitoring of AGN with Millimetre Wavelengths) observes the 4 Stokes parameters of the continuum emission at 3.5 and 1.3 mm, with a time sampling of ~2 weeks for the ~40 brighter sources in the northern sky. The XPOL polarimeter, connected to different heterodyne receiver sets, has been used since the beginning of our observations. In this talk I will introduce...
Dr. Iván Agudo
18/06/2018 - 12:30
Large-IFS for CAHA & LUCA: Local Universe from Calar Alto
LoI for new instruments for 3.5m Telescope
F. Prada, E. Perez-Jimenez, R. Gonzalez Delgado, R. Garcia Benito
14/06/2018 - 12:30
PLATO: de cazar a domesticar sistemas planetarios
Today, stellar and planetary physics enjoy an unprecedented boost thanks to space technology. From the first missions such as MOST and CoRoT, to Kepler / K2 and the recently launched TESS, hundreds of new exoplanets have been detected by photometric transits, and thousands more are to be confirmed. The main objective of these missions are to find new planetary systems, around other stars similar to our Sun. Logical detection bias due to...
Dr. Juan Carlos Suárez
UGR, Spain
07/06/2018 - 12:30
Physical and statistical properties of High Frequency Peaked blazars
In the class of active galactic nuclei (AGNs), blazars are the most extreme objects, with their relativistic jets closely aligned to our line-of-sight. The emission of blazars is mostly non-thermal, spanning the entire electromagnetic spectrum, and is often linearly polarized providing us with important insights on the magnetic field structure. An emerging radio-loud AGN population is represented by high synchrotron peaked (HSP) blazars,...
Dr. Lico
Universidad de Bologna,Italy
24/05/2018 - 12:30
On the ultra-compact dwarf galaxy-nuclear star cluster connection
Ultra-compact dwarf galaxies (UCDs) are predominatly found in the cores of nearby galaxy clusters, regions that are dominated by early-type galaxies, among them nucleated dwarf ellipticals. One of the favourite scenarios for the origin of UCDs is that they are isolated nuclei from threshed dwarf galaxies or maybe also from disrupted late-type spiral galaxies that fell into the clusters. In this scenario one would expect to find super...
Dr. Michael Hilker
17/05/2018 - 12:30
The Empirical Grounds of Supernova-Gamma-ray Burst connection
I will review the status of the SN-GRB connection. Present data suggest that SNe associated with GRBs form a heterogeneous class of objects including both bright and faint Hypernovae. Some of the special conditions requested by a massive star to become a GRB are discussed.
Prof. Massimo Della Valle
Observatorio de Nápoles, Italy
10/05/2018 - 12:30
Stellar activity blurring our insight into the properties of exoplanets
Stellar activity can provide important information regarding the structure, evolution, and the atmosphere of the stars, as well as their magnetic filed and mechanisms that generate them. On the other hand stellar activity introduces severe astrophysical noise in the collected data in the quest for what might be called Earth 2.0. In this talk, I will present main obstacles and difficulties which stellar activity poses on the detection and...
Dr. Mahmoudreza Oshagh
Institute for Astrophysics, Georg-August-University of Göttingen, Germany
26/04/2018 - 12:30
Lightning – from Its Base to Space
Lightning has been studied for centuries with surprisingly meager progress since the early breakthroughs of Franklin. There are numerous reasons for this lack of progress: lightning is complex, it is very energetic with large peak power - hard for in-situ probes to survive, it is spatially and temporally sparse – hard to place a sensor in an optimal location. However, modern technological advances and innovations have led to new remote...
Prof. Hugh Christian
Earth System Science Center,University of Alabama in Huntsville, USA
18/04/2018 - 12:30
Recreating the Early Mass-Loss Histories of pre Planetary Nebulae
Hubble images of the amazing symmetries of young planetary nebulae have captured the imagination of the public. Scientifically, unravelling the physics of their ejection histories is the ultimate goal. I will present detailed surprisingly simple hydro outflow models that capture both the present shapes and the flow kinematics of several and very disparate nebulae.
Prof. Bruce Balick
Univ. Washington, Seattle, USA
13/04/2018 - 12:30
Observatorio Astrofísico de Javalambre: a dedicated facility for large sky surveys
The Observatorio Astrofísico de Javalambre (OAJ) is an astronomical infrastructure conceived to carry out large sky, multi-filter astronomical surveys from the Northern hemisphere. It is fundamentally structured around two large field-of-view (FoV) telescopes and their corresponding panoramic instrumentation for direct imaging. OAJ main telescopes are the Javalambre Survey Telescope (JST/T250), a 2.55m telescope with a FoV of 3 deg diameter, and...
Dr. Antonio Marín-Franch
12/04/2018 - 12:30
The J-PAS and J-PLUS large sky surveys: an unprecedented view of the Universe in multi-colors
The Observatorio Astrofísico de Javalambre (OAJ), managed and operated by the Centro de Estudios de Física del Cosmos de Aragón (CEFCA), is mostly devoted to conduct large sky multi-filter surveys with two large field of view telescopes of 2.5m and 80cm and their respective panoramic instrumentation. The main survey to be carried out in the next years is J-PAS (Javalambre Physics of the Accelerating Universe Astrophysical Survey). Conceived as a...
Dr. Javier Cenarro
05/04/2018 - 12:30
ESERO Spain, del espacio al aula
Un proyecto de la ESA acogido en el Parque de las Ciencias para fomentar las vocaciones científico-tecnológicas en las primeras etapas educativas, haciendo uso del contexto del espacio.
Manuel Roca & Domingo Escutia
Parque de las Ciencias, Spain
22/03/2018 - 12:30
Carbon Chemistry in Carbon-rich AGB stars
The chemistry of carbon in evolved stars will be discussed from the observational and chemical modelling point of view. From the photosphere of the central star to the external layers of the circumstellar envelope different chemical processes allow the formation of different carbon molecules, among them carbon clusters and carbon chain radicals. The chemistry if not completely understood as many reactions are involved in the formation of...
Prof. José Cernicharo
21/03/2018 - 10:00
MEGARA @ GTC: performance review and commissioning results
MEGARA, the optical multi-object spectrograph (MOS) for the GTC 10m telescope, has been developed by a Consortium whose partners are UCM, INAOE, IAA-CSIC and UPM. MEGARA has 2 observing modes on sky: (a) a central IFU 12.5” x 11.3” of 567 fibers, complemented with 8 x 7-fiber bundles for sky subtraction, and (b) a MOS mode with 92 robotic positioners, covering a total FoV of 3.5' x 3.5'. MEGARA provides intermediate-to-high spectral resolution (...
Dr. Jorge Iglesia
15/03/2018 - 12:30
Navigating the Universe : « Cosmic Flows » program
I will present the evolution of the “Cosmic Flows” program spanning ten years of research since its inception in 2006. From CF1 to the latest CF3 data-set, an order of magnitude in the number of observational galaxy distances is gained, meanwhile the cosmographied volume is multiplied by 150. A theoretical framework has been developed so as to accommodate and analyze the data. This includes the Bayesian reconstruction tools of the Wiener filter...
Professor Hélène Courtois 
University of Lyon 1, France
07/03/2018 - 12:30
Mesa redonda: "Luces y sombras en la carrera científica de las mujeres. Hacia una igualdad efectiva entre hombres y mujeres."
Componentes de la mesa: Laly Gallego, contratada predoctoral Marta González, contratada postdoctoral Rosa González, primera profesora de investigación del IAA Rosa de Castro, gestora de proyectos europeos Nuria Rico, profesora de la ETS de Ingenierías Informática y de Telecomunicaciones de la UGR. Lucia Estevan, contratada FPU de la UGR y activista de la plataforma @huelga8mgranada Coordina: Isabel Márquez, vicedirectora del IAA
Mesa redonda
22/02/2018 - 12:30
The luminous S-star cluster in the Galactic center allows us to study the physics close to a super-massive black hole including distinctive dynamical tests of general relativity. Our best estimates for the mass of and the distance to Sgr A* is currently obtained using the three shortest period stars. Additionally, we aimed at a new and practical method to investigate the relativistic orbits of stars in the gravitational field near Sgr A...
Prof. Andreas Eckart
I. Physikalisches Institut, Universitaet zu Koeln, Germany
15/02/2018 - 12:30
Can CALIFA tell us something about the cosmic evolution of the star formation rate and stellar mass of the Universe?
We investigate the cosmic evolution of the absolute and specific star formation rate (SFR, sSFR) of galaxies as derived from a spatially-resolved study of the stellar populations in a set of nearby galaxies from the CALIFA survey. The results show again the uniqueness of the CALIFA survey to characterize the cosmic evolution of the spatially- resolved SFR and stellar mass of galaxies. Also the success of the fossil record of the stellar...
Prof. Rosa González
25/01/2018 - 12:30
Diffuse Ionized Gas in CALIFA (and MaNGA) galaxies
We use spatially resolved spectroscopy from the CALIFA survey to study the nature of the line emitting gas in galaxies of different Hubble types, focusing on the separation of star-forming (SF) regions from those better characterized as diffuse ionized gas (DIG). The diagnosis is carried out in terms of the equivalent width of Ha (W_Ha). Three nebular regimes are identified: (1) Regions where W_Ha...
Dr. Roberto Cid Fernandes
Universidade Federal de Santa Catarina, Brazil
18/01/2018 - 12:30
Dust belts around Proxima Centauri. First results from a multi-department project at the IAA
In this talk I will present the results of an exploratory program we carried out at the ALMA Observatory soon after the discovery of a terrestrial planet candidate in a temperate orbit around Proxima Centauri, the star closest to our Sun. Our ALMA observations reveal the presence of a belt of dust orbiting the star at distances ranging between 1 and 4 au, approximately. This dust might trace a small-scale analog to our solar system's Kuiper Belt...
Dr. Guillem Anglada
11/01/2018 - 12:30
Dynamics and properties of gas at the Center of the Galaxy
In the central parsec of the Milky Way Galaxy the environment of the super-massive black hole (SMBH) presents a complicated composition that includes a very young star cluster mixed with qby tidally stretched clouds of ionized gas (the Minispiral). The Galactic Center's inner few tens of arcseconds have been observed at high resolution with Keck for 20 years, with the primary goal of monitoring stars orbiting the SMBH. This unique baseline of...
Dr. Anna Ciurlo
30/11/2017 - 12:30
GRB 170817A: a peculiar low-luminosity short gamma-ray burst associated with a NS-NS merger gravitational wave signal
Short-duration gamma-ray bursts (sGRBs) have long been proposed to be produced in systems involving the coalescence of double neutron stars (NS-NS), and the observations of sGRB afterglows and host galaxies are consistent with such a conjecture. Based on the estimated event rate density derived from previously observed sGRBs at cosmological distances, the chance of detecting a sGRB within a small volume for detectable NS-NS mergers by advanced...
Dr. Binbin Zhang
23/11/2017 - 12:30
Fighting in Maya ruins: Data Engineering, Data Science, computation clusters and the trans-neptunian search tool
IAA is sitting under a gold mine of data, achieved in past observing campaigns, that will be increased with the data coming from next instrumentation. A tool that can exploit the wealth beneath our feet is the Engineering and Data Science (EDS). This lecture will introduces the EDS and its application on preliminary analysis on a concrete astronomical problem: the search of trans-neptunian objects. Two of the tools used in this analysis will...
Dr. Rafael Morales
16/11/2017 - 12:30
Surprising characteristics of the dwarf planet Haumea revealed by a stellar occultation
The solar system currently contains 8 planets and 5 dwarf planets. Among the 5 dwarf planets, 4 of them dwell in the transneptunian region, and among the transneptunian dwarf planets, the only one that remained poorly characterized was Haumea. This was because all other dwarf planets had been visited by spacecraft or had produced stellar occultations which allowed us to determine some of their basic physical properties with accuracy. The only...
Dr. Jose Luis Ortíz
09/11/2017 - 12:30
Conclusions after the first work of Master's degree in Data Science at the IAA
Advanced algorithms of automatic learning and/or massive data processing, applied to astronomical data, promise to provide very pleasant surprises. Both types of algorithms are part of the field of Data Science research. Taking advantage of the fact that Granada has a worldwide reference group in Data Science (Soft Computing and Intelligent Information Systems, directed by Francisco Herrera), a collaboration with the IAA...
Dr. Rafael Morales
02/11/2017 - 12:30
W170817/GRB 170817A/AT2017gfo: A Tryptich of Rosetta Stones for Compact Object Astrophysics
On the 17th of August 2017, an astronomical event occurred which represents a watershed in our understanding of neutron stars. The LIGO and Virgo gravitational-wave observatories detected the first compact binary inspiral produced by two neutron stars, which was followed about two seconds later by a short GRB, labelled GRB 170817A, detected by the GBM instrument on Fermi. The detection by all three GW observatories allowed the error region to be...
Dr. David Alexander Kann
26/10/2017 - 12:30
The Supernovae that Accompany Gamma-ray bursts
Energetic supernovae have been seen to occur at the same spatial locations as long-duration gamma-ray bursts (GRBs). These so-called gamma-ray burst supernovae (GRB-SNe) are bright and energetic, and their spectra indicate that material within in the supernova outflow moves at tens of thousands of kilometres per second. The first GRB-SN was observed in 1998, with only 50 in the intervening years. Over the past two decades, the physical...
Dr. Zach Cano
19/10/2017 - 12:30
Bringing science to kids and general public at the Observatoire de la Côte d'Azur
It is important to transmit the science developed in a research institution to the public. This transmission helps to increase the scientific culture of the general public, and also can help to awake scientific vocations in the kids. During this talk I will present several actions carried out at the Observatoire de la Côte d'Azur (Nice, France), to bring astronomy to the school children and also to the general public. I will talk about the...
Dr. Olga Suarez
Observatoire de la Côte d'Azur , France
16/10/2017 - 12:00
SKA Science Data Centres: A Platform for Global Astronomy
M. Wise: The SKA is an ambitious project to construct one the world’s more powerful radio telescopes and enable transformational science across a wide range of research areas. Based on current projections, the SKA Observatory, once operational, is expected to produce an archive of standard data products with a growth rate on the order of 300 petabytes per year. Although the challenges associated with populating and maintaining the SKA science...
Prof. Michael Wise & Prof. Ian Wird
Astronomy Group at ASTRON, Netherland & LHC Computer Grid (CERN), Switzerland
05/10/2017 - 12:30
Dust evolution in the interstellar medium
Dust grains play a crucial role in many physical and chemical processes in the interstellar medium (ISM) and in protoplanetary disks (PPDs). In the ISM, dust properties influence, for example, the formation and temperature of the major molecules in molecular clouds. It is therefore important to characterise the grain size, structure, shape and material composition in all phases of the ISM. Observations of the dust SED and extinction give...
Dr. Melanie Köehler
Queen Mary University of London ,UK
27/09/2017 - 12:30
High-z proto-clusters with the GTC
The study of high-z proto-clusters are important for constraining several cosmological parameters. These clusters are hard to find as they do no yet emit the strong X-ray emission typical of the local clusters. These proto-clusters are however found either around strong QSO’s or more often around strong star-forming galaxies. Incidentally, they are also found around strong sub-millimetre galaxies. We have undertaken a search for Lyα sources...
Prof. Jose Miguel Rodríguez-Espinosa
IAC, Spain
21/09/2017 - 12:30
Analogue spacetimes
Analogue spacetimes, (as opposed to general relativity spacetimes), arise when applying the mathematics of differential geometry to generic physical systems. As long as the perturbations have finite propagation speed, then the causal structure can be summarized by propagation cones, similar to the light cones of general relativity; thereby defining a conformal structure. Often one can go further and define an analogue Lorentzian metric....
Prof. Matt Visser
Victoria University, Wellington, Nueva Zelanda
14/09/2017 - 12:30
Hydrodynamical models of planetary nebulae with [WC] central stars
High-resolution, long-slit spectroscopic observations of two planetary nebulae, M1-32 and M3-15 are presented. The observations were obtained with the 2.1-m telescope at the OAN- SPM, and MES spectrograph. M1-32 shows wide wings on the base of its emission lines, M3-15 has two very faint high-velocity knots. To model M1-32 and M3-15 we built a 3D model consisting in a jet interacting with an equatorially concentrated slow wind, emulating the...
Jackeline Rechy Garcia
Instituto de Astronomía, UNAM
07/09/2017 - 12:30
High resolution radio imaging of nearby star-forming galaxies: on the way to SKA
The Square Kilometer Array (SKA) will be a key instrument in the study of our local Universe. In particular, by virtue of its high sensitivity (both to point sources and diffuse low surface brightness emission), angular resolution and the frequency ranges covered, the SKA will undertake a very wide range of astrophysical research in the field of nearby galaxies. By surveying nearby galaxies of all types with microJy sensitivity and sub-arcsecond...
Prof. Antxon Alberdi
29/06/2017 - 12:30
An overview of the first science from the Sunrise II mission
On June, 2013, a second edition of the Sunrise stratospheric, balloon-borne mission took place from Kiruna (Sweden) to Northern Canada. During these five days, the instruments aboard Sunrise were observing the Sun for long periods of stable conditions. New and interesting science has come out from this second flight, which has been published in a special issue of ApJ Supplement. In this talk, I’ll summarize a bunch of these first results to...
Dr. Jose Carlos del Toro Iniesta
08/06/2017 - 12:30
The Dynamic Universe: Adventures in Time Series Analysis
Modern astrophysics has revealed a Universe alive with explosions great and small. It is an astonishingly active place, far different from the serene “clockwork Universe” previously envisioned. Our tour of this dynamic Universe includes the active Sun, extrasolar planets and the search for intelligent life on them, the highly active relativistic plasma that is the residue of a stellar explosion in the year 1054 AD, dramatic x-ray...
Dr. Jeff Scargle
Space Science Division, NASA Ames Research Center, USA