Author

A. Berdeu

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Open access Aug 2026

Discovery of a star sensitive to the spin of Sagittarius A*

Residing in the centre of the Milky Way, Sagittarius A* (Sgr A*) is the closest massive black hole1 (MBH). Its vicinity has allowed measuring individual stellar orbits around it2, 3–4. The stars act as test particles and probe the gravitational potential around the 4.3 × 106M⊙ MBH. These observations have determined th...

K. A. El Dayem, R. Abuter, N. Aimar et al. · Nature · 1 citation

Aug 2026

GRAVITY+ adaptive optics

GRAVITY+ is an upgrade of the VLTI infrastructure, providing unprecedented spatial resolution and sensitivity. One of the project's objectives was to replace the low-order NGS SCAO systems with four high-order AO modules incorporated in the Coudé train of each VLT UT: GRAVITY+ Adaptive Optics (GPAO). This paper present...

S. Oberti, J. Kolb, A. Berdeu et al. · Astronomical Telescopes + In... · 1 citation