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Broad-band transmission spectrum and K-band thermal emission of WASP-43b as observed from the ground
- Publication Year :
- 2014
- Publisher :
- arXiv, 2014.
-
Abstract
- (Abridged) We observed one transit and one occultation of the hot Jupiter WASP-43b simultaneously in the g'r'i'z'JHK bands using the GROND instrument on the MPG/ESO 2.2-meter telescope. From the transit event, we have independently derived WASP-43's system parameters with high precision, and improved the period to be 0.81347437(13) days. No significant variation in transit depths is detected, with the largest deviations coming from the i', H, and K bands. Given the observational uncertainties, the broad-band transmission spectrum can be explained by either a flat featureless straight line that indicates thick clouds, synthetic spectra with absorption signatures of atomic Na/K or molecular TiO/VO that indicate cloud-free atmosphere, or a Rayleigh scattering profile that indicates high-altitude hazes. From the occultation event, we have detected planetary dayside thermal emission in the K-band with a flux ratio of 0.197 +/- 0.042%, which confirms previous detections obtained in the 2.09 micron narrow band and Ks-band. The K-band brightness temperature 1878 +108/-116 K favors an atmosphere with poor day- to night-side heat redistribution. We also have a marginal detection in the i'-band (0.037 +0.023/-0.021%), which is either a false positive, a signature of non-blackbody radiation at this wavelength, or an indication of reflective hazes at high altitude.<br />Comment: 14 pages, 9 figures, accepted for publication in A&A
- Subjects :
- 010504 meteorology & atmospheric sciences
FOS: Physical sciences
Astrophysics
01 natural sciences
Occultation
Atmosphere
Settore FIS/05 - Astronomia e Astrofisica
K band
0103 physical sciences
Hot Jupiter
Transit (astronomy)
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Eclipse
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
Astronomy and Astrophysics
Radius
Light curve
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
planetary systems
stars
WASP-43
planets and satellites
atmospheres
techniques
photometric
fundamental parameters
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....6f33f17cea67c475e7dd318ff7d3fa61
- Full Text :
- https://doi.org/10.48550/arxiv.1401.3007