J/A+A/500/L45 Observations of transits of the TrES-2 exoplanet (Mislis+, 2009)
Detection of orbital parameter changes in the TrES-2 exoplanet ?
Mislis D., Schmitt J.H.M.M
<Astron. Astrophys. 500, L45 (2009)>
=2009A&A...500L..45M 2009A&A...500L..45M
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry
Keywords: stars : planetary systems - techniques : photometric
Abstract:
We report a possible change in the orbit parameters of the TrES-2
exoplanet. With a period of 2.470621 days, the TrES-2 exoplanet
exhibits almost "grazing" transits 110.4-minutes duration as measured
in 2006 by Holman and collaborators (2007, Cat. J/ApJ/664/1185).
We observed two transits of TrES-2 in 2008 using the 1.2m
Oskar-Luhning telescope (OLT) of Hamburg observatory employing CCD
photometry in an i-band and a near to R-band filter. A careful
lightcurve analysis including a re-analys is of the 2006 observations
shows that the current transit duration has shortened since 2006 by
∼3.16-minutes. Although the new observations were taken in a
different filter we argue that the observed change in transit duration
time cannot be attributed to the treatment of limb darkening. If we
assume the stellar and planetary radii to be constant, a change in
orbit inclination is the most likely cause of this change in transit
duration.
Description:
We observed two transits of TrES-2 (on UT 2008 May 28 and September
18), corresponding to epochs E=263, 312 of the ephemeris given by
O' Donovan et al. (2006ApJ...651L..61O 2006ApJ...651L..61O)
Objects:
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RA (2000) DE Designation(s)
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19 07 14.0 +49 18 59 TrES-2 = NAME TrES-2b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 362 Relative photometry data
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See also:
J/ApJ/664/1185 : TrES-2 transits (Holman+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date
16- 25 F10.8 --- RFlux Relative flux
27- 39 E13.8 --- e_RFlux Uncertainty in RFlux
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Acknowledgements:
Mislis Dimitris, mdimitri(at)hs.uni-hamburg.de
(End) Patricia Vannier [CDS] 23-Jun-2009