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2011MNRAS.412.1599B - Mon. Not. R. Astron. Soc., 412, 1599-1610 (2011/April-2)
The effect of M dwarf starspot activity on low-mass planet detection thresholds.
BARNES J.R., JEFFERS S.V. and JONES H.R.A.
Abstract (from CDS):
We extrapolate a model used to describe solar spot distributions to simulate the spot patterns that we expect to find on M dwarfs. Under the assumption that M dwarfs are near or fully convective, we randomly place starspots on the stellar surface, simulating different levels of spot coverage. Line profiles distorted by spots are derived and are used to investigate the starspot-induced jitter. By making assumptions about the degree of spot activity, detection limits for earth-mass planets in habitable zones are simulated for between 10 and 500 observation epochs. We find that ≤ 50 epochs are required to detect 1-2 {img} planets (with <1 per cent false alarm probability) orbiting slowly rotating 0.1 and 0.2 M☉stars. This sensitivity decreases when typical rotation velocities and activity levels for each stellar mass/spectral type are considered. No detections of below 20 {img} planets are expected for ≤ 500 observations for the most active stars with v sin i ≥ 20 km/s and dark spots.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: radial velocities - stars: activity - stars: atmospheres - planetary systems - starspots
Simbad objects: 2
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