Spurious 'active longitudes' in parametric models of heavily spotted eclipsing binaries
arXiv:astro-ph/0504637 · doi:10.1111/j.1365-2966.2005.08951.x
Abstract
In this paper, size distributions of starspots extrapolated from the case of the Sun, are modelled on the eclipsing binary SV Cam to synthesise images of stellar photospheres with high spot filling factors. These spot distributions pepper the primary's surface with spots, many of which are below the resolution capabilities of eclipse mapping and Doppler imaging techniques. The lightcurves resulting from these modelled distributions are used to determine the limitations of image reconstruction from photometric data. Surface brightness distributions reconstructed from these lightcurves show distinctive spots on the primary star at its quadrature points. It is concluded that two-spot modelling or chi-squared minimisation techniques are more susceptible to spurious structures being generated by systematic errors, arising from incorrect assumptions about photospheric surface brightness, than simple Fourier analysis of the light-curves.
5 pages, 18 figures, MNRAS in press
References in corpus (2)
Cited by in corpus (13)
- The effect of M dwarf starspot activity on low-mass planet detection thresholds
- Magnetic activity on AB Doradus: Temporal evolution of starspots and differential rotation from 1988 to 1994
- Is it possible to detect planets around young active G and K dwarfs?
- The CARMENES search for exoplanets around M dwarfs: Benchmarking the impact of activity in high-precision radial velocity measurements
- Starspots in contact and semi-detached binary systems
- Recurrent starspot activity and differential rotation in KIC 11560447
- Recovering planet radial velocity signals in the presence of starspot activity in fully convective stars
- Hubble Space Telescope Observations of SV Cam: I. The Importance of Unresolved Starspot Distributions in Lightcurve Fitting
- Hubble Space Telescope Observations of SV Cam: II. First Derivative Lightcurve Modelling using PHOENIX and ATLAS Model Atmospheres
- Spot evolution in the eclipsing binary CoRoT 105895502
- A compact flare eclipsed in the corona of SV Cam
- The CARMENES search for exoplanets around M dwarfs : Understanding the wavelength dependence of radial velocity measurements
- Inactive longitude and superflare in the active single-lined pre-main sequence binary V2279 Cyg