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

Non-perturbative spinning black holes in dynamical Chern-Simons gravity, Terence Delsate, Carlos Herdeiro, Eugen Radu; Phys. Lett. B 787 (2018) 8-15, arXiv:1806.06700 [gr-qc].

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Regular Articles
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Spontaneous scalarisation of charged black holes, Carlos A. R. Herdeiro, Eugen Radu, Nicholas Sanchis-Gual, José A. Font; Phys. Rev. Lett. 121 (2018) 101102, arXiv:1806.05190 [gr-qc].

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Regular Articles
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Black holes, gravitational waves and fundamental physics: a roadmap, L. Barack et al.,; arXiv:1806.05195 [gr-qc].

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Regular Articles
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Shadows of Exact binary black holes, Pedro V. P. Cunha, Carlos A. R. Herdeiro, Maria J. Rodriguez; Phys. Rev. D 98 (2018) 044053; arXiv:1805.02798 [gr-qc].

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Regular Articles
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Spinning boson stars and hairy black holes with non-minimal coupling, Carlos A. R. Herdeiro, Eugen Radu; International Journal of Modern Physics D 27 (2018) 1843009, arXiv:1803.08149 [gr-qc].

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Regular Articles
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Latest Astrophysics News & Events

A super-nova remnant in Andromeda galaxy

Gr@v member Valério Ribeiro was part of an international team of researchers studying thermonuclear eruptions in the Andromeda galaxy. The team published, in Nature magazine, the discovery of a super-nova remnant which is bigger than most supernova remnants. They found that the super-nova remnant was the consequence of yearly repeated eruptions over millions of years. Few of these systems are known in the galaxy due to the fact that we suffer from dust obscuration.

2018 Alberto prize awarded to João Rosa

Gr@v member João Rosa was one of the recipients of the 2018 Alberto prize, awarded by the Portuguese Society of Relativity and Gravitation (SPRG). The prize was given for his work on the phenomenon of superradiance and its physical and astrophysical implications. The prize was shared by Richard Brito, a researcher of the Max Planck Institute for Gravitational Physics, in Berlin, Germany. The prize was delivered at the General Assembly of the SPRG, on 19th December 2018, during the XI Black Holes Workshop.

Visit to University of Concepcion in Chile

Gr@v member Tjarda Boekholt recently travelled to the University of Concepcion in Chile. He was invited by the Theory and Starformation Group (TSG), which is led by a team of professors including Mike Fellhauer, Dominik Schleicher, Amelia Stutz and Stefano Bovino. In the first week Tjarda lectured students on the Astrophysical Multi-purpose Software Environment (AMUSE). In particular, they discussed the coupling between N-body and hydrodynamics.