Query : 2011A&A...528A..65M

2011A&A...528A..65M - Astronomy and Astrophysics, volume 528A, 65-65 (2011/4-1)

High-precision photometry of WASP-12 b transits.


Abstract (from CDS):

The transiting extrasolar planet WASP-12 b was found to be one of the most intensely irradiated exoplanets. It is unexpectedly bloated and is losing mass that may accrete into the host star. Our aim was to refine the parameters of this intriguing system and search for signs of transit timing variations. We gathered high-precision light curves for two transits of WASP-12 b. Assuming various limb-darkening laws, we generated best-fitting models and redetermined the parameters of the system. Error estimates were derived by the prayer-bead method and Monte Carlo simulations. System parameters obtained by us are found to agree with previous studies within one sigma. Use of the non-linear limb-darkening laws results 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 of transit timing variation are detected at the level of 3.4 sigma. This signal can be induced by an additional planet in the system. Simplified numerical simulations show 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 constrain properties of the perturber.

Abstract Copyright:

Journal keyword(s): planets and satellites: individual: WASP-12 b - stars: individual: WASP-12

VizieR on-line data: <Available at CDS (J/A+A/528/A65): rv.dat>

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 WASP-12 ** 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 283 2
2 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 700 1
3 WASP-4 PM* 23 34 15.0857248317 -42 03 41.047972591   13.51 12.48 11.9   G7V 160 1

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