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

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

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Regular Articles
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Black hole lasers powered by axion superradiant instabilities, João G. Rosa, Thomas K. Kephart; arXiv:1709.06581 [gr-qc].

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Regular Articles
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Lensing and dynamics of ultra-compact bosonic stars, Pedro V. P. Cunha, José A. Font, Carlos Herdeiro, Nicolas Sanchis-Gual, Miguel Zilhão; Accepted in Phys. Rev. D (2017), arXiv:1709.06118 [gr-qc].

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Regular Articles
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Light ring stability in ultra-compact objects, Pedro V. P. Cunha, Emanuele Berti, Carlos A. R. Herdeiro; Accepted in Phys. Rev. Lett. (2017); e-Print: arXiv:1708.04211 [gr-qc].

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Regular Articles
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Synchronous frequencies of extremal Kerr black holes: resonances, scattering and stability, Maurício Richartz, Carlos A. R. Herdeiro, Emanuele Berti, Phys. Rev. D 96 (2017) 044034; e-Print: arXiv:1706.01112 [gr-qc].

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Regular Articles
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Latest Astrophysics News & Events

A no-go theorem for exotic alternatives to black holes as LIGO/Virgo sources

Five of the ground-breaking gravitational wave detections by the LIGO/Virgo collaboration have been interpreted as black hole collisions forming a more massive black hole. It is hard to demonstrate conclusively that these objects are indeed black holes, and there is a lively debate on the intriguing possibility that other, more exotic alternatives could explain the observations. In an article to appear in Physical Review Letters, Gr@v members P.

Alan Alves

Full Name: Alan Jorge Alves do Carmo

Position: Post Doc

Degree: PhD

Office: 

Phone:

Email: acarmo@ua.pt

Main Research Interests

- Solar System Dynamics;
- Exoplanets;
- Celestial Mechanics;
- Dynamical Systems;
- Planetary Physcis;