Past Pizza Lunches

Número de entradas: 152

08
Junio 2018

Unveiling a cluster of protoplanetary disks around the massive protostar GGD27 MM1


Inicio: 12:15h
Ponente: Gemma Busquet (Institut de Ciencies de l'Espai (CSIC-IEEC))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Most stars, including our Sun, form in clusters embedded within molecular clouds. It is then important to characterize the protostellar disk population in dense environments to assess whether the environment plays a role in the subsequent evolution; specifically whether planet formation is altered with…
Inicio: 12:15h
Ponente: Gemma Busquet (Institut de Ciencies de l'Espai (CSIC-IEEC))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Most stars, including our Sun, form in clusters embedded within molecular clouds. It is then important to characterize the protostellar disk population in dense environments to assess whether the environment plays a role in the subsequent evolution; specifically whether planet formation is altered with respect to more isolated stars formed in dark clouds. In this talk, I’ll present ALMA observations at 1.14 mm towards the high-mass star-forming region GGD27, which harbors a B0-type young stellar object and it is surrounded by a cluster of infrared sources. The unprecedented angular resolution (40 mas) and sensitivity provided by ALMA has brought us to the serendipitous discovery of a cluster of disks from low-mass protostars in the vicinity of the massive protostar GGD27 MM1. I’ll present the properties of the disk population of the GGD 27 cluster and a comparison with the findings reported from nearby regions forming stars in isolation. 
01
Junio 2018

e-XTP: a near-future China-EU mission for X-ray timing and polarization


Inicio: 12:15h
Ponente: Margarita Hernanz Carbó
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

The enhanced X-ray Timing and Polarimetry mission (eXTP) is a China-led science space mission designed to study the state of matter under extreme conditions of density, gravity and magnetism. Its predicted launch date is 2025. eXTP will carry a unique and unprecedented suite of state-of-the-art instruments,…
Inicio: 12:15h
Ponente: Margarita Hernanz Carbó
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

The enhanced X-ray Timing and Polarimetry mission (eXTP) is a China-led science space mission designed to study the state of matter under extreme conditions of density, gravity and magnetism. Its predicted launch date is 2025. eXTP will carry a unique and unprecedented suite of state-of-the-art instruments, enabling for the first time ever the simultaneous spectral-timing-polarimetry studies of cosmic sources in the energy range from 0.5 to 30 keV. In addition to science contributions (previous LOFT and XIPE teams), at ICE we are leading the Wide Field Monitor instrument, which is the Spanish instrumental contribution to eXTP. I will explain the main scientific goals of the mission and its instrumentation, as well as our contribution to the payload. The current status of the mission (extended Phase A) and its forthcoming phases and scheduling details will be presented as well.
25
Mayo 2018

Radial velocities of cool stars with rocky planets


Inicio: 12:15h
Ponente: Manuel Perger (Institut de Ciencies de l'Espai (CSIC-IEEC))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

We are already able to detect potentially habitable, rocky planets with the precision of modern Doppler spectroscopy. At least if they orbit a low-mass star. In this domain however, magnetic phenomena of the host star affect the measurements and are even able to hide and mimic a true planetary signal.…
Inicio: 12:15h
Ponente: Manuel Perger (Institut de Ciencies de l'Espai (CSIC-IEEC))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

We are already able to detect potentially habitable, rocky planets with the precision of modern Doppler spectroscopy. At least if they orbit a low-mass star. In this domain however, magnetic phenomena of the host star affect the measurements and are even able to hide and mimic a true planetary signal. A challenge in modern radial velocity planet searches is therefore the understanding of the different stellar contributions. In this talk I will explain how we measure and obtain high-precision radial velocities and how we can disentangle the different contributions. With this focus, I will discuss in length the recent findings of exoplanets like Proxima Centauri b, GJ 3998b,c, GJ 3942b, and will give previews on my recent research target. 
18
Mayo 2018

Sniffing Alien Atmospheres: Exoplanet spectrophotometry (from ground-, airborne- and space-based observatories)


Inicio: 12:15h
Ponente: Angerhausen, Daniel (Center for Space and Habitability (CSH), Bern University, Switzerland)
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

In my presentation I will give a short introduction to the science of extrasolar planets, in particular the technique of transit, eclipse and phasecurve spectro-photometry.  I will describe my various projects in this emerging field using state of the art spectroscopic and photometric instruments on…
Inicio: 12:15h
Ponente: Angerhausen, Daniel (Center for Space and Habitability (CSH), Bern University, Switzerland)
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

In my presentation I will give a short introduction to the science of extrasolar planets, in particular the technique of transit, eclipse and phasecurve spectro-photometry.  I will describe my various projects in this emerging field using state of the art spectroscopic and photometric instruments on the largest ground based telescopes, the 'flying telescope' SOFIA (Stratospheric Observatory for Infrared Astronomy) and the Kepler and Hubble space telescopes.
11
Mayo 2018

The PAU data management: from observations to science ready data


Inicio: 12:15h
Ponente: Santiago Serrano Elorduy (ICE-CSIC)
Lugar: Alberto Lobo

The data reduction of a large galaxy survey can be complex to design and orchestrate, due to its large dataset and a delicate calibration. In this talk I will explain the process that happens to the Physics of the Accelerating Universe (PAU) data, from the observations at the William Herschel Telescope…
Inicio: 12:15h
Ponente: Santiago Serrano Elorduy (ICE-CSIC)
Lugar: Alberto Lobo

The data reduction of a large galaxy survey can be complex to design and orchestrate, due to its large dataset and a delicate calibration.
In this talk I will explain the process that happens to the Physics of the Accelerating Universe (PAU) data, from the observations at the William Herschel Telescope up to the final calibrated catalogues of galaxies used by the scientists in the collaboration to perform the cosmological analysis.
04
Mayo 2018

Gaia opens a new era in astrophysics


Inicio: 12:15h
Ponente: Carme Jordi (Universitat de Barcelona)
Lugar: Sala Alberto Lobo

ESA's Gaia mission has just released its second archive comprising observations taken during the first 22 months of scientific operation. It includes proper motions, parallaxes and colors of more than 1300 millions of objects, radial velocities for 7 millions, light curves for 500,000 stars and positions…
Inicio: 12:15h
Ponente: Carme Jordi (Universitat de Barcelona)
Lugar: Sala Alberto Lobo

ESA's Gaia mission has just released its second archive comprising observations taken during the first 22 months of scientific operation. It includes proper motions, parallaxes and colors of more than 1300 millions of objects, radial velocities for 7 millions, light curves for 500,000 stars and positions for 14,000 asteroids among others. Not only because of the sheer volume of data, but also because of the unprecendented precision, we can assure that a new era in our understanding of the Milky Way, stellar physics and astrophysics in general has begun. In this talk, we describe the content of the archive, we propose recommendations for using the data, and overview their quality based upon the first scientic results obtained.
 
27
Abril 2018

Gravity and the cosmological constant


Inicio: 12:15h
Ponente: Enrique Gaztañaga
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

In the last 15 years scientists have embarked in the search of the nature of Dark Energy. We have built (and are building) new instruments, telescopes and satellites... to collect the largest and oldest cosmic maps ever made. The simplest explanation for Dark Energy is the Cosmological Constant. This…
Inicio: 12:15h
Ponente: Enrique Gaztañaga
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

In the last 15 years scientists have embarked in the search of the nature of Dark Energy. We have built (and are building) new instruments, telescopes and satellites... to collect the largest and oldest cosmic maps ever made. The simplest explanation for Dark Energy is the Cosmological Constant. This is also what all observational evidence indicates, everyday with higher accuracy and from different methods. I will show how the Cosmological Constant is just a natural extension of the laws of Gravity, both in its classical (Newtonian) and General Relativity versions. I will argue that there is nothing mysterious about its existence or the value that the cosmological constant has. If this is the case, Dark Energy study is not a good justification to build the next generation of Cosmic Maps. Instead, those maps are needed to understand our origins and a variety of physical and astrophysical process that we still don't understand in the universe, like what is dark matter, what is the neutrino mass or how galaxies and stars form and evolve. This point of view has important implications for the design and planing of the next generation of cosmic surveys.
20
Abril 2018

White dwarfs and the meteoritic Ne-E anomaly


Inicio: 12:15h
Ponente: Jordi Isern Vilaboy
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

The analysis of the noble gas content in primitive meteorites has shown the existence of anomalous isotopic abundances when compared the Solar System values. These anomalies led to the idea that the collapse of the primitive solar nebula was triggered by the explosion of a nearby supernova. In particular…
Inicio: 12:15h
Ponente: Jordi Isern Vilaboy
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

The analysis of the noble gas content in primitive meteorites has shown the existence of anomalous isotopic abundances when compared the Solar System values. These anomalies led to the idea that the collapse of the primitive solar nebula was triggered by the explosion of a nearby supernova. In particular it has been found that some graphite grains contain a 22Ne rich component that is usually attributed to the radioactive decay of 22Na produced in the O/Ne burning layers of a supernova. In this talk we speculate about a different origin, the disruption of a white dwarf by a collision with a compact object: a white dwarf, a neutron star or a blackhole.
13
Abril 2018

The Autonomous F(R) Gravity Phase space: From Late-time Evolution to Neutron Stars Dynamics


Inicio: 12:15h
Ponente: V.K.Oikonomou (Thessaloniki Univ., Greece)
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

The f(R) gravity phase space is quite rich in structure, and if correctly constructed it can yield useful information for both astrophysical and cosmological applications. In this work we construct the autonomous dynamical system of vacuum f(R) gravity and we investigate the behavior of the dynamical…
Inicio: 12:15h
Ponente: V.K.Oikonomou (Thessaloniki Univ., Greece)
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

The f(R) gravity phase space is quite rich in structure, and if correctly constructed it can yield useful information for both astrophysical and cosmological applications. In this work we construct the autonomous dynamical system of vacuum f(R) gravity and we investigate the behavior of the dynamical evolution focusing on de Sitter attractors. Also we investigate the case that the late-time attractor develops a Big Rip singularity. As we demonstrate, the late-time attractor is a stable de Sitter attractor which inevitably leads to a Big Rip singularity. We also demonstrate a novel property of the f(R) gravity phase space near Big Rip singularities. For our analysis we employ a powerful theorem that holds true for polynomial autonomous dynamical systems, so the dynamical system must be formed in the above way. Finally, we demonstrate how this theorem can find application in the neutron stars dynamics, and how it can yield useful information for the formation of a singularity at the center of the star.
06
Abril 2018

Stephen Hawking (1942-2018): The Scientific Legacy


Inicio: 12:15h
Ponente: Carlos Sopuerta
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

In this talk I will try to summarize, from my own personal perspective, the main scientific contributions of Stephen Hawking, taking into account the context of the developments in Relativistic Astrophysics, Cosmology and the quest for a Quantum Theory of Gravitation. 
Inicio: 12:15h
Ponente: Carlos Sopuerta
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

In this talk I will try to summarize, from my own personal perspective, the main scientific contributions of Stephen Hawking, taking into account the context of the developments in Relativistic Astrophysics, Cosmology and the quest for a Quantum Theory of Gravitation. 
Institute of Space Sciences (IEEC-CSIC)

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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya