Future high contrast interferometric observations with the Very Large Telescope Interferometer (VLTI) require nanometer level control of optical path variations to preserve fringe stability and maximize sensitivity. Within the framework of the PLANETES project, a dedicated laser metrology system is being developed to m...
Amira Bouikni, M. Nowak, Sylvestre Lacour et al.· Astronomical Telescopes + In...· 0 citations
We present a systematic interferometric search for close supermassive black hole (SMBH) binaries in 20 nearby type 1 active galactic nuclei (AGN) observed with VLTI/\grav. We investigate parsec-scale asymmetric emission by modeling the squared visibilities and closure phases with a single circular Gaussian component pl...
Gravity Collaboration K. Abd El Dayem, N. Aimar, A. Berdeu et al.· 0 citations
Over the past six years, the VLTI has undergone major upgrades, significantly improving its stability, sensitivity, and operational reliability. This has enabled the highest-angular-resolution images of stars orbiting our Galactic Center, high-precision interferometric astrometric measurements of exoplanet systems, and...
Luis Esteras Otal, J. Abad, R. Abuter et al.· Astronomical Telescopes + In...· 3 citations
Galactic Cepheid variable stars are fundamental calibrators of the cosmic distance scale through their period-luminosity (PL) relation. The high-precision parallaxes expected from Gaia Data Release 4 (DR4) will enable a calibration of the Milky Way PL relation with unprecedented precision. This will place stringent req...
W. Kiviaho, P. Kervella, M. Juvela et al.· Astronomy & Astrophysics· 0 citations
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
We present PLANETES, a technology development project that aims at demonstrating GRAVITY-style dualfield interferometry into the J band. Building on PIONIER’s legacy in short-wavelength interferometry and GRAVITY’s breakthroughs in dual-field operation, this demonstrator integrates dual-field injection, integratedoptic...
M. Nowak, Sylvestre Lacour, R. Abuter et al.· Astronomical Telescopes + In...· 0 citations
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