Astrophysical: Astrometry

  • Publication
    Solo dwarfs - III. Exploring the orbital origins of isolated Local Group galaxies with Gaia Data Release 2
    We measure systemic proper motions for distant dwarf galaxies in the Local Group and investigate if these isolated galaxies have ever had an interaction with...
  • Publication
    Space astrometry of the very massive ˜150 M⊙ candidate runaway star VFTS682
    How very massive stars form is still an open question in astrophysics. VFTS682 is among the most massive stars known, with an inferred initial mass of ≳150 M_⊙...
  • Publication
    Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2
    Here we explore the efficiency and fidelity of a purely astrometric selection of quasars as point sources with zero proper motions in the Gaia data release 2...
  • Publication
    SSSPM J1102-3431: A probable new young brown dwarf member of the TW Hydrae Association
    We have used archival survey data, most importantly from the SuperCOSMOS Sky Surveys, to derive accurate proper motions and thus confirm the membership of two...
  • Publication
    SSSPM J1444-2019: An extremely high proper motion, ultracool subdwarf
    We present the discovery of a new extreme high proper motion object (˜3.5 arcsec/year) which we classify as an ultracool subdwarf with [M/H] ˜ -0.5. It has a...
  • Talk
    Stellar Rotation in the Gaia Era: Gyrochronology Under Inspection
    Rotation plays an important role in the life of stars and offers a potential diagnostic to infer their ages and that of their planets. This idea is known as...
  • Publication
    Supplement: "An Isolated Mass-gap Black Hole or Neutron Star Detected with Astrometric Microlensing" (2022, ApJL, 933, L23)
    This supplement provides supporting material for Lam et al. We briefly summarize past gravitational microlensing searches for black holes (BHs) and present...
  • Publication
    The CARMENES search for exoplanets around M dwarfs. Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf-white dwarf binary
    Context. M dwarfs are ideal targets for the search of Earth-size planets in the habitable zone using the radial velocity method, and are attracting the...
  • Publication
    The central parsecs of active galactic nuclei: challenges to the torus
    Type 2 active galactic nuclei (AGN) are by definition nuclei in which the broad-line region and continuum light are hidden at optical/UV wavelengths by dust...