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

Spatially resolved polarization swings in the supermassive binary black hole candidate OJ 287 with first Event Horizon Telescope observations, J. L. Gómez et al. (w/ H. Olivares); Astron. Atrophys. 705 (2026) A23.

Publication type
Regular Articles
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Ring Asymmetry and Spin in M87*, V. Bernshteyn et al. (w/ H. Olivares); arXiv:2601.00394 [astro-ph.HE].

Publication type
Regular Articles
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Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations, Saurabhn et al. (w/ H. Olivares); Accepted for publication in Astron. Astrophys.arXiv:2512.08970 [astro-ph.HE].

Publication type
Regular Articles
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Horizon-scale variability of from 2017--2021 EHT observations, The Event Horizon Telescope Collaboration (w/ H. R. O. Sánchez); Astron. Astrophys. 704 (2025) A91arXiv:2509.24593 [astro-ph.HE].

Publication type
Regular Articles
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Numerical simulations of jet launching and breakout from collapsars, G. Urrutia, A. Janiuk, H. Olivares; arXiv:2507.10231 [astro-ph.HE].

Publication type
Regular Articles
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Latest Astrophysics News & Events

Binary Boson stars in Strong Field: Post-Minkowskian, Effective-one-body formalism, and Numerical Relativity

GGD - Gr@V Seminar
Speaker
Tamanna Jain (LPENS)
Event date
Venue
Hybrid: Sala Sousa Pinto and Teams
Event type

In this talk, I will present our recent work on scattering of two boson stars by taking into account three effects: point-mass gravitational, tidal, and short-range scalar-field interactions. We first derive the analytical expressions of the scattering angle using PM-EFT techniques, providing the first analytical treatment of boson stars as a two-body problem.

New Aspects of spontaneous scalarization of black holes beyond General relativity

GGD - Gr@V Seminar
Speaker
Zakaria Belkhadria (Université de Genève/Università degli Studi di Cagliari)
Event date
Venue
Hybrid: Sala 11.2.21 and Teams
Event type

Spontaneous scalarization is a mechanism that allows black holes to develop a non-trivial profile of a scalar field “scalar hair” because of tachyonic instabilities, enabling tests of gravity beyond General Relativity.