Astrophysics

Astrophysics is an area concerning various physical ranging from planetary sized systems, to galactic scale systems and beyond, that intersects various disciplines such as Newtonian dynamics, relativistic physics and particle physics processes.

For our latest developments/activities in this area, please see the listing below at the end of this article.

Exoplanets

An exoplanet is a planet outside the Solar System. In the Milky Way galaxy, it is expected that there are many billions of planets (at least one planet, on average, orbiting around each star, resulting in 100–400 billion exoplanets), with many more free-floating planetary-mass bodies orbiting the galaxy directly.

We study the long-term dynamics of known multi-planet systems. This allow us to test the accuracy of the orbital parameters' determinations, as well as to understand how these systems evolved. We also look for the stable zones in the gaps between already-known planets in order to determine where is it possible to locate Earth-like planets.

See here a movie made by the PhD Animation on "Exoplanets Explained", for a review on the main observational methods used to detect exoplanets.


Latest Astrophysics Publications

The imitation game reloaded: effective shadows of dynamically robust spinning Proca stars, I. Sengo, P. V. P. Cunha, C. A. R. Herdeiro, E. Radu; arXiv:2402.14919 [gr-qc].

Publication type
Regular Articles
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Ordered magnetic fields around the 3C 84 central black hole, G. F. Paraschos et al. (w/ H. Olivares); Astron. Astrophys. 682 (2024) L3, arXiv:2402.00927 [gr-qc].

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Regular Articles
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Fundamental Physics Opportunities with the Next-Generation Event Horizon Telescope, D. Ayzenberg et al. (w/ P. V P. Cunha and H. Olivares); arXiv:2312.02130 [astro-ph.HE].

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Regular Articles
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Testing the Existence of Event Horizons against Rotating Reflecting Surfaces, J. Kleuver, T. Bronzwaer, H. Falcke, R. Narayan, Y. Mizuno, O. Porth, H. Olivares; arXiv:2311.05555 [gr-qc].

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Regular Articles
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Magnetised tori with magnetic polarisation around Kerr black holes: variable angular momentum discs, S. Gimeno-Soler, O. M. Pimentel, F. D. Lora-Clavijo, A. Cruz-Osorio, J. A. Font; arXiv:2303.15867 [astro-ph.HE].

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Regular Articles
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Latest Astrophysics News & Events

Numerical evolution of well-posed field theories with anisotropic scaling

Gr@v Seminars - Banner
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.

Discussion of the paper "Accretion within the innermost stable circular orbit: analytical thermodynamic solutions in the adiabatic limit", by A. Mummery and S. Balbus

Speaker
Héctor Olivares (U. Aveiro)
Event date
Venue
Hybrid: Room Sousa Pinto and Zoom
Ends on
Event type

Accretion within the innermost stable circular orbit: analytical thermodynamic solutions in the adiabatic limit

A. Mummery, and S. Balbus

arXiv:2302.14437 [astro-ph.HE]