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

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

Publication type
Regular Articles
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Scale-invariant scalar field dark matter through the Higgs portal, Catarina Cosme, João G. Rosa, Orfeu Bertolami; arXiv:1802.09434 [hep-ph].

Publication type
Regular Articles
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Effective stability against superradiance of Kerr black holes with synchronised hair, Juan Carlos Degollado, Carlos A. R. Herdeiro, Eugen Radu; arXiv:1802.07266 [gr-qc].

Publication type
Regular Articles
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Does the black hole shadow probe the event horizon geometry?, Pedro V. P. Cunha, Carlos A. R. Herdeiro, Maria J. Rodrigues; Phys. Rev. D97 (2018) 084020, 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;  General Relativity and Gravitation 50 (2018) 42, Invited Review selected as Editor's Choice; Special Issue; arXiv:1801.00860 [gr-qc].

Publication type
Review articles
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Latest Astrophysics News & Events

Morphology and absolute magnitudes of QSOs, from astrometry to astrophysics

Bruno Coelho
Speaker
Bruno Coelho
Event date
Venue
room 32.3.30 CICFANO
Event type

Quasi-Stellar Objects (QSOs) are active galactic nuclei so powerful, that their luminosity can surpass that of the host galaxy, making the observation of the latter extremely difficult or even impossible. Usually QSOs appear on images as point-like sources, what, together with the enormous distances, makes them excellent objects for the materialization of reference systems.

Gr@v visits UNAM

A team of Gr@v members (P. Cunha, J. Delgado, C. Herdeiro and J. Oliveira) is visiting the Universidad Nacional Autónoma de México, at its Cuernava Campus, in April-May 2018 hosted by Professor Juan Carlos Degollado. The visit occurs within a Marie Curie RISE action, of which both UNAM and Aveiro Universities are partners.

Eddington at Sundy

On May 29th, 1919 a joint Royal Astronomical Society and Royal Society expedition led by Arthur Eddington to Principe observed a total solar eclipse, confirming the deflexion of light predicted by the General Theory of Relativity.  Eddington at Sundy: 100 years later (E@S) results from a joint initiative of several institutions, including our group, to celebrate the centenary of these observations.

"Nullius in Verba"

The University of Aveiro and Gr@v join the many worldwide tributes to the life and work of Stephen Hawking. As a small contribution, the U. Aveiro asked Gr@v member C. Herdeiro to write an article for its online news that can be found here. A video statement can be found here (both in Portuguese).