Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-14
Astron.Astrophys. 414 (2004) 1139-1152
Astronomy and Astrophysics
Astrophysics
15 pages, 12 figures, accepted for publication in A&A. The full version with high resolution figures is available from http:
Scientific paper
10.1051/0004-6361:20034039
(abridged) A method for simulating light curves containing stellar micro-variability for a range of spectral types and ages, based on parameter-by-parameter scaling of a multi-component fit to the solar irradiance power spectrum (from VIRGO/PMO6 data), and scaling laws derived from ground based observations of various stellar samples, is presented. We observe a correlation in the Sun between the amplitude of the power spectrum on weeks timescales and the BBSO Ca II K-line index of chromospheric activity. On the basis of this evidence, the chromospheric activity level, predicted from rotation period and B-V colour estimates according to the relationship first introduced by Noyes(1983) and Noyes et al. (1984), is used to predict the variability power on weeks time scale. The rotation period is estimated on the basis of a fit to the distribution of rotation period versus $B-V$ observed in the Hyades and the Skumanich (1972) spin-down law. The characteristic timescale of the variability is also scaled according to the rotation period. We use this model to estimate the impact of the target star type and age on the detection capability of missions such as Eddington and Kepler. K stars are found to be the most promising targets, while the performance drops significantly for stars earlier than G and younger than 2.0 Gyr. Simulations also show that \emph{Eddington} should detect terrestrial planets orbiting solar-age stars in most of the habitable zone for G2 types and all of it for K0 and K5 types.
Aigrain Suzanne
Favata Fabio
Gilmore Gerard
No associations
LandOfFree
Characterising stellar micro-variability for planetary transit searches does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Characterising stellar micro-variability for planetary transit searches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characterising stellar micro-variability for planetary transit searches will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-428154