Archivi tag: binaries

The many faces of compact stars

In this school, we want to give a broad overview of all the possible manifestations of compact objects in different astrophysical scenarios. For this purpose, a large list of topics will be addressed during the meeting by renowned international experts: accretion theory, binaries, neutron stars thermal emission, equation of states, microquasar jets, neutron star cooling, radio-pulsars, magnetospheres, compact stars as gravitational wave sources, GRBs, Supernovae and their environments, etc…

Astrotomography II – Imaging at the micro-arcsecond scale

Astrotomography is a generic term for indirect mapping techniques that can be applied to a huge variety of astrophysical systems, ranging from planets via single stars and binaries to active galactic nuclei. With this workshop we aim at consolidating the success of a previous workshop dedicated to this topic, and plan to bring together people from different communities but who use similar techniques to construct images at very high angular resolution. In the time since the first workshop, the scientific output of the astrotomography methods has been considerable, the range of applications becoming larger and larger with time. It is thus timely to review these methods, the progress in the field, the new harvest of results that were collected, as well as to prepare the next generation of astronomers to use these tools.

Brown Dwarfs come of Age

An international conference on Brown Dwarfs will be held next May in the sunny island of Fuerteventura, exactly 11 years after the first IAU Symposium devoted to these once elusive objects and 18 years after the definitive observational confirmation of their existence. Much work has been done in the last two decades, both from the theoretical and observational point of view. Time is ripe now to have a conference to provide a comprehensive overview of this very active field of research. Some of the most relevant work on Brown Dwarfs has been done in the Canarian Observatories, making Canary Islands an ideal location to host this conference. Fuerteventura is the easternmost island of the Canaries, rich of unique natural spaces and impressive landscapes. It is well connected by direct flights with many European cities and offers many possibilities of affordable and comfortable accommodation. This island is working to preserve its dark night sky and become a Starlight Reserve.

Wide-area surveys such as DENIS, SDSS and 2MASS have played a major role in the discoveries of some of the first brown dwarfs and the definition of the spectral classes L and T. Recently completed and ongoing surveys such as IPHAS, PANSTARS, UKIDSS and WISE are shedding new light on the field. An even cooler spectral class, the Y dwarfs, has been revealed. Detailed studies of brown dwarfs have uncovered surprising behaviours such as ultra-fast rotation rates, the presence of clouds, polarization and strong radio emission. Observations of dust in disks around very low-mass primaries with the Spitzer and Herschel satellites have provided information on the conditions of planet formation. Brown dwarfs have become prime interest targets for searches for habitable planets due to their small masses and radii, and the presence of a habitable regions very close to them for extended periods of time. Brown dwarfs populate the natural bridge between stars and planets. As such, they are connected with both types of objects. One of the main focus of this international conference will be to examine whether the fundamental properties of brown dwarfs represent a smooth continuity from stars to planets or not. Brown dwarfs and their extension into planetary masses represent the low-mass end of the stellar IMF. Deep observations of young open clusters and star-forming regions and microlensing surveys have found a population of very low-mass brown dwarfs or free-floating planets.

Our conference will provide a comprehensive update of the status of this active field of research. Here is a list of the scientific topics that will be treated:

  • Formation and early evolution of brown dwarfs
  • Angular momentum and disk evolution in very low mass systems
  • Large scale surveys
  • Deep surveys
  • Brown dwarfs in binary systems
  • The lower end of the IMF
  • Planets around brown dwarfs
  • Ultracool atmospheres
  • Spectroscopy of brown dwarfs
  • Time domain phenomena in brown dwarfs: activity and weather
  • Oncoming and future projects in the substellar world
  • The brown dwarfs-exoplanet connection