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hits: 144
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  • Magnetic reconnection plasm... Magnetic reconnection plasmoid model for Sagittarius A flares
    Aimar, N.; Dmytriiev, A.; Vincent, F. H. ... Astronomy & astrophysics, 04/2023, Volume: 672
    Journal Article
    Peer reviewed
    Open access

    Context. Sagittarius A*, the supermassive black hole at the center of our Galaxy, exhibits episodic near-infrared flares. The recent monitoring of three such events with the GRAVITY instrument has ...
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  • Polarimetry and astrometry ... Polarimetry and astrometry of NIR flares as event horizon scale, dynamical probes for the mass of Sgr A
    Abuter, R.; Aimar, N.; Amaro Seoane, P. ... Astronomy & astrophysics, 09/2023, Volume: 677
    Journal Article
    Peer reviewed
    Open access

    We present new astrometric and polarimetric observations of flares from Sgr A* obtained with GRAVITY, the near-infrared interferometer at ESO’s Very Large Telescope Interferometer (VLTI), bringing ...
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  • Using the motion of S2 to c... Using the motion of S2 to constrain scalar clouds around Sgr A
    Foschi, A; Abuter, R; Aimar, N ... Monthly notices of the Royal Astronomical Society, 07/2023, Volume: 524, Issue: 1
    Journal Article
    Peer reviewed
    Open access

    ABSTRACT The motion of S2, one of the stars closest to the Galactic Centre, has been measured accurately and used to study the compact object at the centre of the Milky Way. It is commonly accepted ...
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  • Characterization of the var... Characterization of the variability in the O+B eclipsing binary HD 165246
    Johnston, C; Aimar, N; Abdul-Masih, M ... Monthly notices of the Royal Astronomical Society, 05/2021, Volume: 503, Issue: 1
    Journal Article
    Peer reviewed
    Open access

    ABSTRACT O-stars are known to experience a wide range of variability mechanisms originating at both their surface and their near-core regions. Characterization and understanding of this variability ...
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  • Where intermediate-mass bla... Where intermediate-mass black holes could hide in the Galactic Centre
    Straub, O.; Bauböck, M.; Abuter, R. ... Astronomy and astrophysics (Berlin), 04/2023, Volume: 672
    Journal Article
    Peer reviewed
    Open access

    Context. In the Milky Way the central massive black hole, Sgr A * , coexists with a compact nuclear star cluster that contains a sub-parsec concentration of fast-moving young stars called S-stars. ...
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  • Using the motion of S2 to c... Using the motion of S2 to constrain vector clouds around Sgr A
    Foschi, A; Abuter, R; Abd El Dayem, K ... Monthly notices of the Royal Astronomical Society, 05/2024, Volume: 530, Issue: 4
    Journal Article
    Peer reviewed
    Open access

    ABSTRACT The dark compact object at the centre of the Milky Way is well established to be a supermassive black hole with mass $M_{\bullet } \sim 4.3 \times 10^6 \, {\rm M}_{\odot }$, but the nature ...
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  • Polarized signatures of orb... Polarized signatures of orbiting hot spots: Special relativity impact and probe of spacetime curvature
    Vincent, F. H.; Wielgus, M.; Aimar, N. ... Astronomy and astrophysics (Berlin), 04/2024, Volume: 684
    Journal Article
    Peer reviewed
    Open access

    Context. The Galactic Center supermassive black hole is well known to exhibit transient peaks of flux density on a daily basis across the spectrum. Recent infrared and millimeter observations have ...
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  • General relativistic effect... General relativistic effects and the near-infrared and X-ray variability of Sgr A I
    von Fellenberg, S. D.; Witzel, G.; Bauböck, M. ... Astronomy & astrophysics, 01/2023, Volume: 669
    Journal Article
    Peer reviewed
    Open access

    The near-infrared (NIR) and X-ray emission of Sagittarius A* shows occasional bright flares that are assumed to originate from the innermost region of the accretion flow. We identified 25 4.5 μm and ...
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  • The GRAVITY young stellar o... The GRAVITY young stellar object survey
    Soulain, A.; Perraut, K.; Bouvier, J. ... Astronomy and astrophysics (Berlin), 06/2023, Volume: 674
    Journal Article
    Peer reviewed
    Open access

    Context. T Tauri stars are known to be the cradle of planet formation. Most exoplanets discovered to date lie at the very inner part of the circumstellar disk (<1 au). The innermost scale of young ...
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  • Deep images of the Galactic... Deep images of the Galactic center with GRAVITY
    Abuter, R.; Aimar, N.; Amorim, A. ... Astronomy & astrophysics, 01/2022, Volume: 657
    Journal Article
    Peer reviewed
    Open access

    Stellar orbits at the Galactic Center provide a very clean probe of the gravitational potential of the supermassive black hole. They can be studied with unique precision, beyond the confusion limit ...
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