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

Does the black hole shadow probe the event horizon geometry?, Pedro V. P. Cunha, Carlos A. R. Herdeiro, Maria J. Rodrigues; arXiv:1802.02675 [qr-qc].

Publication type
Regular Articles
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Shadows and strong gravitational lensing: a brief review, Pedro V. P. Cunha, Carlos Herdeiro;  arXiv:1801.00860 [gr-qc].

Publication type
Review articles
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Dynamical ejections of stars due to an accelerating gas filament, Tjarda C. N. Boekholt, Amelia M. Stutz, Michael Fellhauer, Dominik R. G. Schleicher, Diego R. Matus Carrillo, Monthly Notices of the Royal Astronomical Society (2017), 471, 3590-3598e-Print: arXiv:1704.00720 [astro-ph].

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Regular Articles
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Dirac perturbations on Schwarzschild Anti-de-Sitter spacetimes: Generic boundary conditions and new quasi-normal modes, Mengjie Wang, Carlos Herdeiro, Jiliang Jing;  Phys. Rev. D 96 (2017) 104035arXiv:1710.10461 [gr-qc].

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Regular Articles
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Lidov-Kozai stability regions in the α Centauri system, C. A. Giuppone, A. C. M. Correia, Astronomy & Astrophysics (2017), 605, A124e-Print: arXiv:1707.03026 [astro-ph].

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Regular Articles
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Latest Astrophysics News & Events

Ema Valente is now a Master

Ema Valente successfully finished her Physics M.Sc. at Aveiro University, on December 20th 2017, by defending a thesis with title "A simple model of exotic compact objects: interaction with a scalar field". This thesis was supervised by Gr@v researcher C. Herdeiro and examined by Prof. Luis Crispino, from the U. Federal do Pará, Brazil. Well done Ema!

New SPRG officers

The fourth general assembley of the Portuguese Relativity and Gravitation Society (SPRG) ellected the following new officers: C. Herdeiro (president), J. Natário (vice-president), V. Cardoso (Treasurer), J. Lemos (General Assembley President), F. Mena (First Secretary), J. Costa (Second secretary). These officers appear in the above photograph presenting the 2017 Alberto Prize to M. Zilhão. The remaining officer is J. Rocha ("Fiscal Único").

Scientists discuss black holes in Aveiro

The X Black Holes workshop took place at Aveiro University on 18-19 December 2017. It gathered almost 100 scientists discussing black holes from many different perspectives. Besides 63 oral communications, the workshop also included the fourth General Assembley of the Portuguese Relativity and Gravitation Society (SPRG) and a special session celebrating the 60th anniversary of Prof. J. S. Lemos.