2016A&A...589A..52V


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.22CET09:57:03

2016A&A...589A..52V - Astronomy and Astrophysics, volume 589A, 52-52 (2016/5-1)

Inferring asymmetric limb cloudiness on exoplanets from transit light curves.

VON PARIS P., GRATIER P., BORDE P., LECONTE J. and SELSIS F.

Abstract (from CDS):

Context. Clouds have been shown to be present in many exoplanetary atmospheres. Cloud formation modeling predicts considerable inhomogeneities of cloud cover, consistent with optical phase curve observations. However, optical phase curves cannot resolve some existing degeneracies between cloud location and cloud optical properties.
Aims. We present a conceptually simple technique for detecting inhomogeneous cloud cover on exoplanets. Such an inhomogeneous cloud cover produces an asymmetric primary transit of the planet in front of the host star. Asymmetric transits produce characteristic residuals that are different from standard symmetric models. Furthermore, bisector spans can be used to determine asymmetries in the transit light curve.
Methods. We apply a model of asymmetric transits to the light curves of HAT-P-7b, Kepler-7b, and HD 209458b and search for possible cloud signatures. The nearly uninterrupted Kepler photometry is particularly well suited for this method since it allows for a very high time resolution.
Results. We do not find any statistically sound cloud signature in the data of the considered planets. For HAT-P-7b, a tentative detection of an asymmetric cloud cover is found, consistent with analysis of the optical phase curve. Based on Bayesian probability arguments, a symmetric model with an offset in the transit ephemeris is still the most viable model. This work demonstrates that for suitable targets, namely low-gravity planets around bright stars, the method can be used to constrain cloud cover characteristics and is thus a helpful additional tool for the study of exoplanetary atmospheres.

Abstract Copyright: © ESO, 2016

Journal keyword(s): techniques: photometric - planets and satellites: atmospheres - planets and satellites: individual: Kepler-7b - planets and satellites: individual: HAT-P-7b - planets and satellites: individual: HD 209458b

Simbad objects: 11

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Number of rows : 11

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 HAT-P-32b Pl 02 04 10.2775457769 +46 41 16.210382751           ~ 78 1
2 CoRoT-1b Pl 06 48 19.1724141241 -03 06 07.710423478     13.6     ~ 147 1
3 WASP-31b Pl 11 17 45.3578468391 -19 03 17.216528280           ~ 79 1
4 Ross 905b Pl 11 42 11.0932 +26 42 23.653           ~ 549 1
5 NAME LHS 3275b Pl 17 15 18.94 +04 57 49.7           ~ 492 1
6 KOI-97 Er* 19 14 19.5623271934 +41 05 23.365460942           G0 91 3
7 KOI-97.01 Pl 19 14 19.5623271934 +41 05 23.365460942           ~ 145 1
8 KOI-2.01 Pl 19 28 59.3538131541 +47 58 10.216250846           ~ 252 1
9 BD+47 2846 Er* 19 28 59.3538131541 +47 58 10.216250846   10.97 10.48     F6V 241 2
10 V* V376 Peg EP* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 971 1
11 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1400 1

    Equat.    Gal    SGal    Ecl

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2019.11.22-09:57:03

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