J/A+A/528/A65 WASP-12b transits (Maciejewski+, 2011)
High-precision photometry of WASP-12 b transits.
Maciejewski G., Errmann R., Raetz St., Seeliger M., Spaleniak I.,
Neuhaeuser R.
<Astron. Astrophys. 528, A65 (2011)>
=2011A&A...528A..65M 2011A&A...528A..65M
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, CCD
Keywords: planets and satellites: individual: WASP-12 b -
stars: individual: WASP-12
Abstract:
The transiting extrasolar planet WASP-12b was found to be the one of
the most intensely irradiated exoplanets. It is unexpectedly bloated
and is losing mass which may accrete into the host star. Our aim was
to refine parameters of this intriguing system and search for signs of
transit timing variations. We gathered high-precision light curves of
two transits of WASP-12b. Assuming various limb darkening laws, we
generated best-fitting models and redetermined parameters of the
system. Error estimates were derived by the prayer bread method and
Monte Carlo simulations. System's parameters obtained by us were found
to agree with previous studies within one sigma. Use of the non-linear
limb darkening laws resulted in the best- fitting models. With two new
mid-transit times, the ephemeris was refined to
BJDTDB=(2454508.97682±0.00020)+(1.09142245±0.00000033)E.
Interestingly, indications for transit timing variation were detected
at the level of 3.4 sigma. This signal could be induced by an
additional planet in the system. Simplified numerical simulations
showed that a perturber could be a terrestrial-type planet if both
planets are in a low-order orbital resonance. However, we emphasise
that further observations are needed to confirm variation and to put
constraints on properties of the perturber.
Description:
Light curves of two WASP-12b's transits observed during 2 runs on 2
and 26 February, 2010 are given. Data were collected with the Calar
Alto Faint Object Spectrograph (CAFOS) on the 2.2-m telescope at Calar
Alto Observatory (Spain). Magnitudes in R band were determined with
the aperture photometry method against comparison stars. Trends caused
by differential atmospheric extinction were removed.
Objects:
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RA (2000) DE Designation(s)
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06 30 32.8 +29 40 20 WASP-12 = 2MASS J06303279+2940202
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rv.dat 34 243 *Light curve observed on 2 and 26 Feb, 2010
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Note on rv.dat: For 26 Feb, 2010 observations, portion of data was lost
due to bad weather
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See also:
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/A+A/517/L1 : Radial velocities of WASP-8b planet (Queloz+, 2010)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/A+A/513/L3 : H-band thermal emission of WASP-19b (Anderson+, 2010)
J/A+A/519/A98 : Transit of exoplanet WASP-21b (Bouchy+, 2010)
J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)
J/A+A/526/L10 : Photometic follow-up of WASP-33 (Herrero+, 2011)
J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)
J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)
Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JD Julian Day (1)
16- 24 F9.6 mag Rmag Relative magnitude in R band
27- 34 F8.6 mag e_Rmag Magnitude error
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Note (1): 02/02/2010: JD=2455230, 26/02/2010: JD=2455254
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Acknowledgements:
Gracjan Maciejewski, gm(at)astri.uni.torun.pl
(End) Gracjan Maciejewski [TCfA, Poland], Patricia Vannier [CDS] 25-Jan-2011