2018A&A...616A..39M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST20:55:58

2018A&A...616A..39M - Astronomy and Astrophysics, volume 616A, 39-39 (2018/8-1)

Comparison of the power-2 limb-darkening law from the STAGGER-grid to Kepler light curves of transiting exoplanets.

MAXTED P.F.L.

Abstract (from CDS):


Context. Inaccurate limb-darkening models can be a significant source of error in the analysis of the light curves for transiting exoplanet and eclipsing binary star systems, particularly for high-precision light curves at optical wavelengths. The power-2 limb-darkening law, Iλ(u)=1-c(1-uα), has recently been proposed as a good compromise between complexity and precision in the treatment of limb-darkening.
Aims. My aim is to develop a practical implementation of the power-2 limb-darkening law and to quantify the accuracy of this implementation.
Methods. I have used synthetic spectra based on the 3D stellar atmosphere models from theSTAGGER-grid to compute the limb-darkening for several passbands (UBVRI, CHEOPS, TESS, Kepler, etc.). The parameters of the power-2 limb-darkening laws are optimized using a least-squares fit to a simulated light curve computed directly from the tabulated Iλ(µ) values. I use the transformed parameters h1=1-c(1-2–α) and h2=c2–α to directly compare these optimized limb-darkening parameters to the limb darkening measured from Kepler light curves of 16 transiting exoplanet systems.
Results. The posterior probability distributions (PPDs) of the transformed parameters h1 and h2 resulting from the light curve analysis are found to be much less strongly correlated than the PPDs for c and α. The agreement between the computed and observed values of (h1, h2) is generally very good but there are significant differences between the observed and computed values for Kepler-17, the only star in the sample that shows significant variability between the eclipses due to magnetic activity (star spots).
Conclusions. The tabulation of h1 and h2 provided here can be used to accurately model the light curves of transiting exoplanets. I also provide estimates of the priors that should be applied to transformed parameters h1 and h2 based on my analysis of the Kepler light curves of 16 stars with transiting exoplanets.

Abstract Copyright: © ESO 2018

Journal keyword(s): techniques: photometric - binaries: eclipsing - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/616/A39): table1.dat table2.dat>

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 894 1
2 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1138 0
3 Kepler-8 Ro* 18 45 09.1489711922 +42 27 03.891516422           F6V 89 1
4 Kepler-422 Er* 18 50 31.1173186079 +46 19 23.993001740           G2V 51 0
5 Kepler-43 EB* 19 00 57.8034350700 +46 40 05.664882930   13.8   14.16   G0 67 1
6 Kepler-412 Ro* 19 04 26.4756849829 +43 40 51.351551801   14.41 13.73 14.67 12.79 ~ 46 1
7 Kepler-12 Er* 19 04 58.4220911942 +50 02 25.271416732   13.96   13.68   G0 68 1
8 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 280 2
9 Kepler-491b Pl 19 08 31.3446996418 +42 21 00.608258148           ~ 19 0
10 Kepler-7 Er* 19 14 19.5623271934 +41 05 23.365460942           G0 96 1
11 Kepler-77 Ro* 19 18 25.9101486026 +44 20 43.571350586   15.03 14.10 13.91   G5V 53 1
12 Kepler-425 Ro* 19 21 25.9207958258 +40 34 03.854921157   16.047 14.97 14.73 14.605 K2 40 0
13 Kepler-423 Ro* 19 31 25.3755529467 +46 23 28.219647148           ~ 45 0
14 Kepler-41 Ro* 19 38 03.1746358686 +45 58 53.876517436           ~ 51 1
15 Kepler-15 Ro* 19 44 48.1365419356 +49 08 24.297461391       14.03   G8IV-V 55 1
16 Kepler-6 Ro* 19 47 20.9379174935 +48 14 23.759506909           ~ 78 1
17 Kepler-17 Ro* 19 53 34.8642919207 +47 48 54.049941399   14.6   13.6   G5V 111 1
18 Kepler-5 Ro* 19 57 37.6884816070 +44 02 06.189528905           F5V 87 1
19 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 994 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-20:55:58

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