Astrophysical: Starspots

  • Publication
    A calibration of the Rossby number from asteroseismology
    Stellar activity and rotation are tightly related in a dynamo process. Our understanding of this mechanism is mainly limited by our capability of inferring the...
  • Publication
    A cool starspot or a second transiting planet in the TrES-1 system?
    Aims: We investigate the origin of a flux increase found during a transit of TrES-1, observed with the HST (Hubble Space Telescope). This feature in the HST...
  • Publication
    Acoustic oscillations and dynamo action in the G8 sub-giant EK Eridani
    We present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG...
  • Publication
    Analysis of new high-precision transit light curves of WASP-10 b: starspot occultations, small planetary radius, and high metallicity
    Context. The WASP-10 planetary system is intriguing because different values of radius have been reported for its transiting exoplanet. The host star exhibits...
  • Publication
    Characterization of starspots on a young M-dwarf K2-25: multiband observations of stellar photometric variability and planetary transits
    Detailed atmospheric characterization of exoplanets by transmission spectroscopy requires careful consideration of stellar surface inhomogeneities induced by...
  • Publication
    Characterization of the radial velocity signal induced by rotation in late-type dwarfs
    We investigate the activity-induced signals related to rotation and magnetic cycles in late-type stars (FGKM) and analyse the Ca II H&K, the H α and the radial...
  • Publication
    Chemical abundances and Doppler imaging of the Ap Si/He-wk star HD 100357
    We present the results of time-resolved photometry, abundance analysis, and Doppler imaging of an Ap star, HD 100357. The TESS photometry revealed rotational...
  • Publication
    Correcting the effect of stellar spots on ARIEL transmission spectra - II. The limb-darkening effect
    This paper is part of an effort to correct the transmission spectra of a transiting planet orbiting an active star. In Paper I (Cracchiolo, Micela & Peres 2020)...
  • Publication
    Doppler images of the RS CVn binary HR 1099 (V711 Tau) from the MUSICOS 1998 campaign
    We present Doppler Images of the RS CVn binary system HR 1099 (V711 Tau) from spectra taken in two different sites, KPNO and MSO, during the MUSICOS 1998...