HAT-P-18 b
AIMS
HAT-P-18b, discovered by Hartman et al. (2011), is a 0.197 jupiter mass planet with a radius of 0.995 jupiter radii surrounding a K2 dwarf star. Though the obtained RV signals show no significant deviations from the Keplerian fit, the lightcurves of the two availlable transits show some clear variations in the transit shape worth analyzing with further transit observations.
Figure caption: The original data published by Hartman et al. (2011) showing the RV data and residuals (left, their fig. 3) and the two lightcurves they obtained (right; their fig. 5).
RESULTS
Redetermination of the orbital period possible (less than 1 second) but no TTV measurement possible yet.
Figure caption: The present O-C diagram. Redetermination of the orbital period by 0.9s is possible. There is a huge spread in the data which we could not yet determine due to the low number of successful measurements.
STATUS
The campaign started in 2011 and is continuing in 2013. If you can contribute a light curve, please let me know.
LIGHT CURVES
(update: 2013-03-18)
Reliable
| No. | Date | Epoch | Sight | Comment |
| 1 | 2011 Apr 21 | 174 | Trebur 1.2m | |
| 2 | 2011 May 24 | 180 | Trebur 1.2m | |
| 3 | 2012 May 05 | 243 | Rozhen 0.6m | |
| 4 | 2012 Jun 07 | 249 | CA DLR 1.2m |
other
| No. | Date | Instrument | Comment |
| 1 | 2011 May 02 | Trebur 1.2m | only first half of transit observed |
| 2 | 2011 Jun 04 | Rozhen 2.0m |
CONTACT
PI: Martin Seeliger martin.seeliger@uni-jena.de
