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                <idno type="issn">0004-6361</idno>
                <idno type="eissn">1432-0746</idno>
                <title level="j">Astronomy &amp; Astrophysics - A&amp;A</title>
                <imprint>
                  <publisher>EDP Sciences</publisher>
                  <biblScope unit="volume">685</biblScope>
                  <date type="datePub">2024</date>
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              </monogr>
              <idno type="arxiv">2404.08746</idno>
              <idno type="bibcode">2024A&amp;A...685L...9G</idno>
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              <keywords scheme="author">
                <term xml:lang="en">planets and satellites: dynamical evolution and stability</term>
                <term xml:lang="en">stars: low-mass</term>
                <term xml:lang="en">Astrophysics - Earth and Planetary Astrophysics</term>
                <term xml:lang="en">Astrophysics - Instrumentation and Methods for Astrophysics</term>
                <term xml:lang="en">Astrophysics - Solar and Stellar Astrophysics</term>
                <term xml:lang="en">planets and satellites: detection</term>
                <term xml:lang="en">astrometry</term>
                <term xml:lang="en">instrumentation: interferometers</term>
                <term xml:lang="en">instrumentation: high angular resolution</term>
              </keywords>
              <classCode scheme="halDomain" n="sdu">Sciences of the Universe [physics]</classCode>
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              <p>The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term astrometric observations of the nearest binary M-dwarf Gliese 65 AB (GJ65), located at a distance of only 2.67 pc. We monitored the relative astrometry of the two components from 2016 to 2023 with the VLTI/GRAVITY interferometric instrument. We derived highly accurate orbital parameters for the stellar system, along with the dynamical masses of the two red dwarfs. The GRAVITY measurements exhibit a mean accuracy per epoch of 50−60 ms in 1.5 h of observing time using the 1.8 m Auxiliary Telescopes. The residuals of the two-body orbital fit enable us to search for the presence of companions orbiting one of the two stars (S-type orbit) through the reflex motion they imprint on the differential A-B astrometry. We detected a Neptune-mass candidate companion with an orbital period of p = 156 ± 1 d and a mass of m&lt;sub&gt;p&lt;/sub&gt; = 36 ± 7 M&lt;sub&gt;⊕&lt;/sub&gt;. The best-fit orbit is within the dynamical stability region of the stellar pair. It has a low eccentricity, e = 0.1 − 0.3, and the planetary orbit plane has a moderate-to-high inclination of i &amp;gt; 30° with respect to the stellar pair, with further observations required to confirm these values. These observations demonstrate the capability of interferometric astrometry to reach microarcsecond accuracy in the narrow-angle regime for planet detection by reflex motion from the ground. This capability offers new perspectives and potential synergies with Gaia in the pursuit of low-mass exoplanets in the solar neighborhood.</p>
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