Astronomy and Astrophysics, volume 595A, 61-61 (2016/11-1)
Detection of the secondary eclipse of Qatar-1b in the Ks band.
CRUZ P., BARRADO D., LILLO-BOX J., DIAZ M., BIRKBY J., LOPEZ-MORALES M. and FORTNEY J.J.
Abstract (from CDS):
Aims. Qatar-1b is a close-orbiting hot Jupiter (Rp~=1.18RJ, Mp~=1.33MJ) around a metal-rich K-dwarf, with orbital separation and period of 0.023AU and 1.42 days. We have observed the secondary eclipse of this exoplanet in the Ks band with the objective of deriving a brightness temperature for the planet and providing further constraints to the orbital configuration of the system.
Methods. We obtained near-infrared photometric data from the ground by using the OMEGA2000 instrument at the 3.5m telescope at Calar Alto (Spain) in staring mode, with the telescope defocused. We have used principal component analysis (PCA) to identify correlated systematic trends in the data. A Markov chain Monte Carlo analysis was performed to model the correlated systematics and fit for the secondary eclipse of Qatar-1b using a previously developed occultation model. We adopted the prayer bead method to assess the effect of red noise on the derived parameters.
Results. We measured a secondary eclipse depth of 0.196+0.071–0.051%, which indicates a brightness temperature in the Ks band for the planet of 1885+212–168K. We also measured a small deviation in the central phase of the secondary eclipse of -0.0079+0.0162–0.0043, which leads to a value for ecosω of -0.0123+0.0252–0.0067. However, this last result needs to be confirmed with more data.
© ESO, 2016
planetary systems - stars: individual: Qatar-1b - techniques: photometric
VizieR on-line data:
<Available at CDS (J/A+A/595/A61): fig3_lc.dat>
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