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Table summary of transit measurements
Professional light curves
Comments on LCs on this web page
Period is close to correct but could use a slight shortening.
Basic data -
RA = 17:53:13.0, Decl = +37:12:43
Season = June 21
B = 12.11, V = 11.59, R = 11.28, I = 10.99; B-V = 0.52
HJDo = 4230.9053 (?) & P = 3.553945 (75) day (Schneider's Extrasolar Planets Encyclopedia)
HJDo = 4230.9053 (2) & P = 3.553924 (2) days
Depth = 12.4 ± 1.5 (CVR bands), 10.8 mmag (z-band)
Length = 3.54 ± 0.08 hr (CVR bands), 3.5 hr (z-band)
Fp = 0.32 ± 0.06, F2 = 0.84 ± 0.11
b = 0.75, Rs = 1.78 Rs, Rp = 1.67 * Rj
Table Summary of Measurements
- Updated 20090813
Transit light curves
not yet included in updates of previous sections
All LCs below here have been included in updates of previous sections
Great LC considering the high air mass, lightning that terminated observations and use of a portable 10-inch telescope at a remote site.
Professional Light Curves
Discovery paper LCs (Mandushev, et al, 2007).
9618SG2 Looks like a brief dip at -1.7 hrs. A 5 mmag depth would correspond to Rp = 0.6 Rj, or Mp = 5% the mass of TrES-4b. This, by itself, does not rule-out the possibility that
the dip is produced by another exoplanet orbiting the TrES-4 star. Now consider the length of the dip. Length ~ 0.5 hr, so orbital velocity would be 7 times that of TrES-4b.
For this orbital velocity the orbital radius would have to be 2% of TrES-4b's orbital radius, which would place it within the star (12% of star's radius).
Therefore this dip is not due to another exoplanet orbiting the TrES-4 star!
There's an intriguing "dip" at 1.2 hr past 08.39 UT that may be noteworthy at some future date when more OOT observations are available.
FOV ~ 22 x 13 'arc. Note that a nearby star is variable (Patrick Wiggins, private communication) so don't use it for reference.
The discovery paper by Mandushev et al, 2007 includes
LCs showing depth = 10.8 mmag (z' and B-bands) with a length of ~3.5
to 3.6 hr (depending on definition used).
L. Gary. Nothing on this web page is copyrighted. This site opened:
August 25, 2007. Last Update: 2010.07.26