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BRICS Southern Observatory (BRICS-SO) Project: Invitation to African countries to invest in Chile
Massinissa Hadjara, Amokrane Berdja, Swagat R. Das +6
Recently, the BRICS countries created a promising astronomy consortium (https://www.bricsastronomy.org/), which was joined last year by some emerging countries, including two Afric…
SatHub Panel: Satellite Interference in Observatories Around the World
Siegfried Eggl, Zouhair Benkhaldoun, Genoveva Micheva +5
Satellite constellation interference occurs across astronomical disciplines. We present examples of interference from radio and -Ray astronomy to optical and spectroscopic inter…
Interferometric apodization by homothety -- II. Experimental validation
J Chafi, Y El Azhari, O Azagrouze +4
This work presents the results of experimental laboratory tests on the apodization of circular and rectangular apertures using the Interferometric Apodization by Homothety (IAH) te…
Interferometric apodization by homothety -- I. Optimization of the device parameters
Jamal Chafi, Youssef El Azhari, Ossama Azagrouze +4
This study is focused on the very high dynamic imaging field, specifically the direct observation of exoplanetary systems. The coronagraph is an essential technique for suppressing…
The GRANDMA network in preparation for the fourth gravitational-wave observing run
S. Agayeva, V. Aivazyan, S. Alishov +98
GRANDMA is a world-wide collaboration with the primary scientific goal of studying gravitational-wave sources, discovering their electromagnetic counterparts and characterizing the…
Potential and sky coverage for off-axis fringe tracking in optical long baseline interferometry
Abdelkarim Boskri, Romain G. Petrov, Thami El Halkouj +6
The spectacular results provided by the second-generation VLTI instruments GRAVITY and MATISSE on active galactic nuclei (AGN) trigger and justify a strong increase in the sensitiv…
Development in Astronomy and Space Science in Africa
Mirjana Pović, Michael Backes, Paul Baki +20
The development of astronomy and space science in Africa has grown significantly over the past few years. These advancements make the United Nations Sustainable Development Goals m…
SPECULOOS: a network of robotic telescopes to hunt for terrestrial planets around the nearest ultracool dwarfs
Laetitia Delrez, Michael Gillon, Didier Queloz +18
We present here SPECULOOS, a new exoplanet transit search based on a network of 1m-class robotic telescopes targeting the 1200 ultracool (spectral type M7 and later) dwarfs b…
Hierarchical fringe tracking
Romain G. Petrov, Thami Elhalkouj, Abdelkarim Boskri +6
The limiting magnitude is a key issue for optical interferometry. Pairwise fringe trackers based on the integrated optics concepts used for example in GRAVITY seem limited to about…
European Extremely Large Telescope Site Characterization II: High angular resolution parameters
Héctor Vázquez Ramió, Jean Vernin, Casiana Muñoz-Tuñón +17
This is the second article of a series devoted to European Extremely Large Telescope (E-ELT) site characterization. In this article we present the main properties of the parameters…