Correction to: A simple method to estimate radial velocity variations due to stellar activity using photometry

We present a new, simple method to predict activity-induced radial velocity (RV) variations using high-precision time series photometry. It is based on insights from a simple spot model, has only two free parameters (one of which can be estimated from the light curve) and does not require knowledge of the stellar rotation period. We test the method on simulated data and illustrate its performance by applying it to MOST/SOPHIE observations of the planet host star HD 189733, where it gives almost identical results to much more sophisticated but highly degenerate models, and synthetic data for the Sun, where we demonstrate that it can reproduce variations well below the m s−1 level. We also apply it to quarter 1 data for Kepler transit candidate host stars, where it can be used to estimate RV variations down to the 2–3 m s−1 level, and show that RV amplitudes above that level may be expected for approximately two-thirds of the candidates we examined.

[1]  R. Smith,et al.  Dust discs around intermediate-mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster , 2011, 1110.4219.

[2]  Anne-Marie Lagrange,et al.  Reconstructing the solar integrated radial velocity using MDI/SOHO , 2010, 1005.4764.

[3]  T. Robinson.  MODELING THE INFRARED SPECTRUM OF THE EARTH–MOON SYSTEM: IMPLICATIONS FOR THE DETECTION AND CHARACTERIZATION OF EARTHLIKE EXTRASOLAR PLANETS AND THEIR MOONLIKE COMPANIONS , 2011, 1110.3744.

[4]  F. Fressin,et al.  CHARACTERISTICS OF PLANETARY CANDIDATES OBSERVED BY KEPLER. II. ANALYSIS OF THE FIRST FOUR MONTHS OF DATA , 2011, 1102.0541.

[5]  J. D. Dorren,et al.  A New Formulation of the Starspot Model, and the Consequences of Starspot Structure , 1987 .

[6]  Howard Isaacson,et al.  CHROMOSPHERIC ACTIVITY AND JITTER MEASUREMENTS FOR 2630 STARS ON THE CALIFORNIA PLANET SEARCH , 2010, 1009.2301.

[7]  Xavier Bonfils,et al.  Disentangling between stellar activity and planetary signals , 2010 .

[8]  Patterns of Photometric and Chromospheric Variation among Sun-like Stars: A 20 Year Perspective , 2007, astro-ph/0703408.

[9]  M. Zechmeister,et al.  The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms , 2009, 0901.2573.

[10]  S. Baliunas,et al.  No Planet for Hd 166435 , 2022 .

[11]  S. Aigrain,et al.  Practical planet prospecting , 2004 .

[12]  Comparing different approaches to model the rotational modulation of the Sun as a star , 2006, astro-ph/0612479.

[13]  F. Bouchy,et al.  A new Neptune-mass planet orbiting HD 219828 , 2007, astro-ph/0702459.

[14]  Carl E. Rasmussen,et al.  Gaussian processes for machine learning , 2005, Adaptive computation and machine learning.

[15]  C. Moutou,et al.  Stellar activity of planetary host star HD 189 733 , 2008, 0811.3923.

[16]  D. Queloz,et al.  The HARPS search for southern extra-solar planets. X. A m sin i = 11 M_â planet around the nearby spotted M dwarf GJ 674 , 2007, 0704.0270.

[17]  Antonino Francesco Lanza,et al.  Deriving the radial-velocity variations induced by stellar activity from high-precision photometry Test on HD 189733 with simultaneous MOST/SOPHIE data , 2011, 1107.4864.

[18]  S. Zucker,et al.  Reassessing the radial-velocity evidence for planets around CoRoT-7 , 2010, 1008.3859.

[19]  S. Baliunas,et al.  Patterns of Variation among Sun-like Stars , 1998 .

[20]  J. Wright,et al.  Radial velocity jitter in stars from the california and carnegie planet search at keck observatory , 2005 .

[21]  Nicolas B. Cowan,et al.  Inverting Phase Functions to Map Exoplanets , 2008, 0803.3622.