2013A&A...560A.112M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET02:01:43

2013A&A...560A.112M - Astronomy and Astrophysics, volume 560A, 112-112 (2013/12-1)

High-precision stellar limb-darkening measurements. A transit study of 38 Kepler planetary candidates.

MUELLER H.M., HUBER K.F., CZESLA S., WOLTER U. and SCHMITT J.H.M.M.

Abstract (from CDS):

Planetary transit light curves are influenced by a variety of fundamental parameters, such as the orbital geometry and the surface brightness distribution of the host star. Stellar limb darkening (LD) is therefore among the key parameters of transit modeling. In many applications, LD is presumed to be known and modeled based on synthetic stellar atmospheres. We measure LD in a sample of 38 Kepler planetary candidate host stars covering effective temperatures between 3000K and 8900K with a range of surface gravities from 3.8 to 4.7. In our study we compare our measurements to widely used theoretically predicted quadratic limb-darkening coefficients (LDCs) to check their validity. We carried out a consistent analysis of a unique stellar sample provided by the Kepler satellite. We performed a Markov chain Monte Carlo (MCMC) modeling of low-noise, short-cadence Kepler transit light curves, which yields reliable error estimates for the LD measurements in spite of the highly correlated parameters encountered in transit modeling. Our study demonstrates that it is impossible to measure accurate LDCs by transit modeling in systems with high impact parameters (b>0.8). For the majority of the remaining sample objects, our measurements agree with the theoretical predictions, considering measurement errors and mutual discrepancies between the theoretical predictions. Nonetheless, theory systematically overpredicts our measurements of the quadratic LDC u2 by about 0.07. Systematic errors of this order for LDCs would lead to an uncertainty on the order of 1% for the derived planetary parameters. We find that it is adequate to set the commonly used theoretical LDCs as fixed parameters in transit modeling. Furthermore, it is even indispensable to use theoretical LDCs in the case of transiting systems with a high impact parameter, since the host star's LD cannot be determined from their transit light curves.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - planetary systems - methods: data analysis - techniques: photometric

Simbad objects: 60

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Number of rows : 60

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1497 0
2 Kepler-94 Ro* 18 44 46.7441195652 +47 29 49.746742707           M0V 50 0
3 Kepler-8b Pl 18 45 09.1489711922 +42 27 03.891516422           ~ 78 1
4 Kepler-8 Ro* 18 45 09.1489711922 +42 27 03.891516422           F6V 91 1
5 Kepler-422 Er* 18 50 31.1173186079 +46 19 23.993001740           G2V 53 0
6 KOI-190 EB* 18 58 35.737416 +41 00 54.02232   15.22 14.34 14.10   ~ 29 0
7 Kepler-486 Ro* 18 59 31.1991510825 +49 16 01.170776185           ~ 41 0
8 Kepler-43b Pl 19 00 57.8034350700 +46 40 05.664882930           ~ 45 1
9 Kepler-43 EB* 19 00 57.8034350700 +46 40 05.664882930   13.8   14.16   G0 69 1
10 Kepler-412 Ro* 19 04 26.4756849829 +43 40 51.351551801   14.41 13.73 14.67 12.79 ~ 48 1
11 Kepler-12 Er* 19 04 58.4220911942 +50 02 25.271416732   13.96   13.68   G0 70 1
12 Kepler-12b Pl 19 04 58.4220911942 +50 02 25.271416732           ~ 65 1
13 Kepler-25 Ro* 19 06 33.2143323702 +39 29 16.357969502   11.32 10.77 10.598   ~ 117 1
14 Kepler-25b Pl 19 06 33.2143323702 +39 29 16.357969502           ~ 52 1
15 Kepler-1 Er* 19 07 14.0379171930 +49 18 59.090895318   11.85 11.25     G0V 153 2
16 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 287 2
17 Kepler-1B * 19 07 14.113 +49 18 58.29           K4.5-6 23 1
18 BD+46 2629 Er* 19 07 53.104944 +46 52 06.00420   10.12 9.70 9.80   A0 132 0
19 NAME BD+46 2629Ab Pl 19 07 53.1396671301 +46 52 05.931203366           ~ 115 1
20 Kepler-475 Ro* 19 08 12.4125278915 +40 12 41.501670469           ~ 36 0
21 Kepler-491 EB* 19 08 31.3446996418 +42 21 00.608258148           K1 47 0
22 KOI-141 ** 19 12 09.190104 +50 39 05.79024   14.86 13.82 13.76   G8V 38 0
23 Kepler-7 Er* 19 14 19.5623271934 +41 05 23.365460942           G0 100 1
24 Kepler-7b Pl 19 14 19.5623271934 +41 05 23.365460942           ~ 161 1
25 KOI-187 EB* 19 14 55.0759328666 +42 33 03.204219704           ~ 23 0
26 Kepler-77 Ro* 19 18 25.9101486026 +44 20 43.571350586   15.03 14.10 13.91   G5V 56 1
27 KOI-5 EB* 19 18 57.5311661752 +44 38 50.617631589           G2V 56 0
28 KOI-319 Ro* 19 20 28.2087608275 +44 52 22.549012269   12.91 12.68     ~ 46 0
29 Kepler-425 Ro* 19 21 25.9207958258 +40 34 03.854921157   16.047 14.97 14.73 14.605 K2 41 0
30 Kepler-19b Pl 19 21 40.9995767736 +37 51 06.436261131           ~ 41 1
31 Kepler-19 Ro* 19 21 40.9995767736 +37 51 06.436261131   12.88 12.04 12.02   ~ 69 1
32 BD+48 2893b Pl 19 24 07.7660110490 +49 02 24.928201112           ~ 73 1
33 BD+48 2893 * 19 24 07.7660110490 +49 02 24.928201112   10.73 10.08     ~ 99 1
34 CoRoT-2b Pl 19 27 06.4944821296 +01 23 01.357597206           ~ 189 1
35 BD+47 2846b Pl 19 28 59.3538131541 +47 58 10.216250846           ~ 289 1
36 BD+47 2846 Er* 19 28 59.3538131541 +47 58 10.216250846   10.97 10.48     F6V 260 2
37 Kepler-423 Ro* 19 31 25.3755529467 +46 23 28.219647148           ~ 47 0
38 Kepler-45 Ro* 19 31 29.4966619067 +41 03 51.356309221     16.88 16.63   M1V 74 1
39 Kepler-45b Pl 19 31 29.4966619067 +41 03 51.356309221           ~ 59 1
40 Kepler-1658 EB* 19 37 25.5734997356 +38 56 50.515828644   11.86 11.62     F6 36 0
41 Kepler-41b Pl 19 38 03.1746358686 +45 58 53.876517436           ~ 54 1
42 Kepler-41 Ro* 19 38 03.1746358686 +45 58 53.876517436           ~ 52 1
43 Kepler-71 Ro* 19 39 27.7155063029 +46 17 08.942790311       15.35   G8V 44 1
44 Kepler-485 Ro* 19 39 59.1150173788 +50 28 12.194143031           ~ 38 0
45 Kepler-490 Er* 19 40 06.1617633789 +46 57 21.564919116           ~ 35 0
46 Kepler-493 Ro* 19 41 13.8137853650 +38 52 53.926741862           ~ 30 0
47 Kepler-15 Ro* 19 44 48.1365419356 +49 08 24.297461391       14.03   G8IV-V 57 1
48 Kepler-15b Pl 19 44 48.1365419356 +49 08 24.297461391           ~ 46 1
49 Kepler-6b Pl 19 47 20.9379174935 +48 14 23.759506909           ~ 87 1
50 Kepler-6 Ro* 19 47 20.9379174935 +48 14 23.759506909           ~ 80 1
51 BD+47 2936 EB* 19 50 50.2474562793 +48 04 51.097364378       8.8   K4V 223 2
52 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 304 1
53 Kepler-17 Ro* 19 53 34.8642919207 +47 48 54.049941399   14.6   13.6   G5V 115 1
54 Kepler-17b Pl 19 53 34.8642919207 +47 48 54.049941399           ~ 78 1
55 Kepler-5b Pl 19 57 37.6884816070 +44 02 06.189528905           ~ 88 1
56 Kepler-5 Ro* 19 57 37.6884816070 +44 02 06.189528905           F5V 90 1
57 KOI-102 Ro* 19 58 49.1429603803 +44 26 08.705201001   13.26 11.95     ~ 40 0
58 KOI-44 Ro* 20 00 36.4478849076 +45 05 22.637079509           F7IV 25 0
59 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 1003 1
60 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1520 1

    Equat.    Gal    SGal    Ecl

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2020.11.30-02:01:43

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