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                    <forename type="first">N. Jeremy</forename>
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                    <forename type="first">Benjamin A.</forename>
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                <title level="j">The Astronomical Journal</title>
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                  <publisher>American Astronomical Society</publisher>
                  <biblScope unit="volume">164</biblScope>
                  <date type="datePub">2022</date>
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                <term xml:lang="en">Astrophysics - Solar and Stellar Astrophysics</term>
                <term xml:lang="en">Exoplanet astronomy</term>
                <term xml:lang="en">Radial velocity</term>
                <term xml:lang="en">Low mass stars</term>
                <term xml:lang="en">Direct imaging</term>
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              <classCode scheme="halDomain" n="sdu">Sciences of the Universe [physics]</classCode>
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              <p>We present the direct imaging discovery of a low-mass companion to the nearby accelerating F star, HIP 5319, using SCExAO coupled with the CHARIS, VAMPIRES, and MEC instruments in addition to Keck/NIRC2 imaging. CHARIS JHK (1.1-2.4 μm) spectroscopic data combined with VAMPIRES 750 nm, MEC Y, and NIRC2 L &lt;SUB&gt;p&lt;/SUB&gt; photometry is best matched by an M3-M7 object with an effective temperature of T = 3200 K and surface gravity log(g) = 5.5. Using the relative astrometry for HIP 5319 B from CHARIS and NIRC2, and absolute astrometry for the primary from Gaia and Hipparcos, and adopting a log-normal prior assumption for the companion mass, we measure a dynamical mass for HIP 5319 B of ${31}_{-11}^{+35}{M}_{{\rm{J}}}$ , a semimajor axis of ${18.6}_{-4.1}^{+10}$ au, an inclination of ${69.4}_{-15}^{+5.6}$ degrees, and an eccentricity of ${0.42}_{-0.29}^{+0.39}$ . However, using an alternate prior for our dynamical model yields a much higher mass of ${128}_{-88}^{+127}{M}_{{\rm{J}}}$ . Using data taken with the LCOGT NRES instrument we also show that the primary HIP 5319 A is a single star in contrast to previous characterizations of the system as a spectroscopic binary. This work underscores the importance of assumed priors in dynamical models for companions detected with imaging and astrometry, and the need to have an updated inventory of system measurements. *Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This work makes use of observations from the Las Cumbres Observatory global telescope network (LCOGT).</p>
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