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

Compact elastic objects in general relativity, Artur Alho, José Natário, Paolo Pani, Guilherme Raposo; arXiv:2107.12272 [gr-qc].

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Ultralight bosons for strong gravity applications from simple Standard Model extensions, Felipe F. Freitas, Carlos A. R. Herdeiro, António P. Morais, António Onofre, Roman Pasechnik, Eugen Radu, Nicolas Sanchis-Gual, Rui Santos; arXiv:2107.09493 [gr-qc].

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Regular Articles
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Equatorial timelike circular orbits around generic ultracompact objects, Jorge F. M. Delgado, Carlos Herdeiro, Eugen Radu;  arXiv:2107.03404 [gr-qc].

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Magnetized accretion disks around Kerr black holes with scalar hair - Nonconstant angular momentum disks, Sergio Gimeno-Soler, José A. Font, Carlos Herdeiro, Eugen Radu; arXiv:2106.15425 [gr-qc].

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Regular Articles
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Constraints on dark photon dark matter using data from LIGO's and Virgo's third observing run, LIGO Scientific and VIRGO and KAGRA Collaborations, R. Abbott et al. (includes N. Sanchis-Gual); arXiv:2105.13085 [gr-qc].

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Regular Articles
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Latest Astrophysics News & Events

New members and grants

Guilherme Raposo (left, Ph.D. from Rome, La Sapienza, 2021) joined our group in a partnership with IST-Lisbon from July 2021. Welcome Guilherme! João Novo (middle) and João Pino (right) were awarded individual FCT PhD scholarships in the 2021 call. Congratulations to both!