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Comments on LCs on this web page
Period seems to be good. Length is stable.
The z-band depth may be 25 mmag, but V, R, and C-band depths are 29 mmag.
Basic Data -
RA = 20:00:43.7, Decl = +22:42:37
Season = July 21
HJDo = 3988.80336 (24) & P = 2.218573 (20) day (Schneider listing in Extrasolar Planets Encyclopaedia)
HJDo = 3988.80319 (24) & P = 2.2185762 (3) day (AXA data fit, below); or better yet: HJDo = 4432.51844 (17) & P = 2.2185762 (3) day (another AXA data fit, below)
Depth = 29.0 ± 0.4 mmag (VRC-band)
Length = 1.70 ± 0.03 hr (VRC-band)
Fp = 0.39 ± 0.02, F2 = 0.85 ± 0.05
b = 0.66
Table of Measurements and Plots of Transit Properties - Updated 2009.08.30
Transit light curve -
LCs below here have NOT been included in table & plots (above)
Notice the faded region indicated by double- arrow, which I can't explain. (The overall curvature of this LC is most likely due to "air mass curvature," produced by HD189733 being redder than the average of reference stars.) A sine-wave fit was used to represent whatever the systematic error produced the fade feature.
LC's below here HAVE been included in the above table & plots.
9919LCO3 Digital SLR camera used; only blue pixels used for this LC. Good work!
9919LCO2 Digital SLR camera used; only red pixels used for this LC. Good work!
9919LCO1 Digital SLR camera used; only green pixels used for this LC. Good work!
Light curves below here have been included
in table & plots
9626SFI (I subtracted one hour from JD time tags, & inverted mag's; I hope this was appropriate)
This light curve was made with a 1.33-inch aperture "telescope" (actually, a camera lens) by Petr Svoboda (Czech Republic). It illustrates that for bright exoplanet stars "aperture isn't everything." Observing technique and an understanding of observing and image analysis procedures can be crucial to extracting the information that is capable of being gleaned from an observing session. Congratulations to Petr Svoboda for demonstrating what can be done using a small aperture to obtain a scientifically useful exoplanet transit light curve. (He used a Sonnar 135/3.5 camera lens with a R-band filter attached to a ST7-XME CCD, defocused so that FWHM ~ 4 pixels; exposure times were 1 to 3 minutes to assure linearity. Individual images exhibited SE ~ 10 mmag.)
Thanks, Isaac Cruz, for creating this LC.
9722SG2 Notice the sinusoidal variation with a period of ~ 1.8 hrs, amplitude ~ 1.5 mmag. This might be real.
Just as ingress was expected a thunderstorm began! At least the 4.5 hours of OOT data is featureless.
Bouchy, F. et al, 2005 (discovery paper) link
Algol, E. et al, 2008, Spitzer 8 micron LC link
Miller-Ricci, E. et al, 2008, ApJ, 682, 593 link
L. Gary. Nothing on this web page is copyrighted. This site opened:
August 10, 2007. Last Update: 2012.09.30