Astrophysics News & Events

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The optical appearance of some regular compact objects

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Speaker
Mercè Guerrero (CIDMA, University of Aveiro)
Event date
Venue
On-site: Sala Sousa Pinto
Event type
The significance of multi-ring images in the optical appearance of spherically symmetric compact objects is discussed. Such images are produced by an optically and geometrically thin accretion disk illuminating the object.

Numerical evolution of well-posed field theories with anisotropic scaling

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Speaker
Marcelo Rubio (SISSA, Trieste)
Event date
Venue
On-site: Room TBD
Event type
Dynamical equations exhibiting an anisotropic scaling between space 
and time admit a dispersive nature, as they contain higher-order spatial derivatives, 
but remain second order in time.

Young brown dwarfs and rogue planets in the Milky Way

Gr@v Seminars - Banner
Speaker
Koraljka Muzic (IA, University of Lisbon)
Event date
Venue
Hybrid: Sala Sousa Pinto and Zoom
Event type

There are at least 100 billion brown dwarfs and planetary-mass objects in our Galaxy - objects that are not orbiting a star and have masses between that of Jupiter and of the lowest mass stars (~80 MJup). Several theories for their formation have been proposed, and could all as well be at work, but their relative importance is not known and is expected to vary with mass and environment.