Astrophysical: Techniques

  • Publication
    Long-period magnetic activity in the K dwarf GJ1137 and a new super-Earth on a 9-day orbit: A cautionary tale for Jovian-analogue detection from Doppler surveys
    Context. Detection and characterisation of Jovian analogues in precision radial velocity (RV) measurements is gaining momentum due to the constantly increasing...
  • Publication
    Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of γ Doradus stars
    Context: γ Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode...
  • Publication
    Long-term photometry of IC 348 with the Young Exoplanet Transit Initiative network
    We present long-term photometric observations of the young open cluster IC 348 with a baseline time-scale of 2.4 yr. Our study was conducted with several...
  • Publication
    Long-term stability of spotted regions and the activity-induced Rossiter-McLaughlin effect on V889 Herculis. A synergy of photometry, radial velocity measurements, and Doppler imaging
    Context: The young active G-dwarf star V889 Herculis (HD 171488) shows pronounced spots in Doppler images as well as large variations in photometry and radial...
  • Publication
    Looking for a Connection between the Am Phenomenon and Hybrid δ Sct -γ Dor Pulsation: Determination of the Fundamental Parameters and Abundances of HD 114839 and BD +18 4914
    δ Sct-γ Dor hybrids pulsate simultaneously in p- and g-modes, which carry information on the structure of the envelope as well as to the core. Hence, they are...
  • Publication
    Low optical polarization at the core of the optically thin jet of M87
    We study the optical linear and circular polarization in the optically thin regime of the core and jet of M87. Observations were acquired two days before the...
  • Publication
    Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769
    Aims: We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD 46769 (V = 5.79). We also attempt...
  • Publication
    Low-frequency photospheric and wind variability in the early-B supergiant HD 2905
    Context. Despite important advances in space asteroseismology during the last decade, the early phases of evolution of stars with masses above 15 M⊙ (including...
  • Publication
    Lower atmosphere and pressure evolution on Pluto from ground-based stellar occultations, 1988-2016
    Context. The tenuous nitrogen (N2) atmosphere on Pluto undergoes strong seasonal effects due to high obliquity and orbital eccentricity, and has recently (July...