High-precision photometry of WASP-12 b transits

Maciejewski, G.; Errmann, R.; Raetz,; Seeliger, Martin; Spaleniak, Izabela; Neuhäuser, R.

doi:10.1051/0004-6361/201016268

Cited by 49 publications

(66 citation statements)

References 32 publications

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“…These data were published in Maciejewski et al (2011) and Maciejewski et al (2013). The re-reduction improved the photometric quality of the light curves by up to 15%.…”

Section: Observations and Data Processingmentioning

confidence: 97%

“…To limit the sample to the most reliable data, we considered only complete transit light curves that were acquired with telescopes with mirrors greater than 1 m. In addition to data from Maciejewski et al (2011) and Maciejewski et al (2013), we used photometric time series from Copperwheat et al (2013), Chan et al (2011), Cowan et al (2012), and Stevenson et al (2014).…”

Section: Observations and Data Processingmentioning

confidence: 99%

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Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b

Maciejewski

Dimitrov

Fernández

et al. 2016

A&A

Self Cite

137

152

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Aims. Most hot Jupiters are expected to spiral in toward their host stars because the angular momentum of the orbital motion is transferred to the stellar spin. Their orbits can also precess as a result of planet-star interactions. Calculations show that both effects might be detected for the very-hot exoplanet WASP-12 b using the method of precise transit-timing over a time span of about 10 yr. Methods. We acquired new precise light curves for 29 transits of WASP-12 b, spannning four observing seasons from November 2012 to February 2016. New mid-transit times, together with those from the literature, were used to refine the transit ephemeris and analyze the timing residuals. Results. We find that the transit times of WASP-12 b do not follow a linear ephemeris with a 5σ confidence level. They may be approximated with a quadratic ephemeris that gives a change rate in the orbital period of (−2.56 ± 0.40) × 10 −2 s yr −1 . The tidal quality parameter of the host star was found to be equal to 2.5 × 10 5 , which is similar to theoretical predictions for Sun-like stars. We also considered a model in which the observed timing residuals are interpreted as a result of the apsidal precession. We find, however, that this model is statistically less probable than the orbital decay.

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“…These data were published in Maciejewski et al (2011) and Maciejewski et al (2013). The re-reduction improved the photometric quality of the light curves by up to 15%.…”

Section: Observations and Data Processingmentioning

confidence: 97%

Section: Observations and Data Processingmentioning

confidence: 99%

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b

Maciejewski

Dimitrov

Fernández

et al. 2016

A&A

Self Cite

137

152

View full text Add to dashboard Cite

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“…There have been extensive photometric and spectroscopic studies of WASP-12b (López-Morales et al 2010;Campo et al 2011;Chan et al 2011;Croll et al 2011;Husnoo et al 2011;Maciejewski et al 2011Maciejewski et al , 2013Madhusudhan et al 2011;Cowan et al 2012;Crossfield, Hansen & Barman 2012;Haswell et al 2012;Sada et al 2012;Sokov et al 2012;Southworth et al 2012b;Zhao et al 2012;Copperwheat et al 2013;Crossfield et al 2013;Föhring et al 2013;Fossati et al 2013;Mandell et al 2013;Sing et al 2013;Swain et al 2013;Bechter et al 2014 Table 14. Physical properties of WASP-12b, WASP-33b, WASP-36b, WASP-44b, WASP-48b, and WASP-77Ab derived from the light-curve modelling.…”

Section: Wasp-12bmentioning

confidence: 99%

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

Turner

Pearson

Biddle

et al. 2016

Mon. Not. R. Astron. Soc.

109

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Transits of exoplanets observed in the near-UV have been used to study the scattering properties of their atmospheres and possible star-planet interactions. We observed the primary transits of 15 exoplanets (CoRoT-1b, GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-16b, HAT-P-22b, TrES2b, in the near-UV and several optical photometric bands to update their planetary parameters, ephemerides, search for a wavelength dependence in their transit depths to constrain their atmospheres, and determine if asymmetries are visible in their light curves. Here, we present the first ground-based near-UV light curves for 12 of the targets (CoRoT1b, GJ436b, HAT-P-1b, HAT-P-13b, HAT-P-22b, TrES-2b, TrES-4b, WASP-1b, WASP-33b, WASP-36b, WASP-48b, and WASP-77Ab). We find that none of the near-UV transits exhibit any non-spherical asymmetries, this result is consistent with recent theoretical predictions by Ben-Jaffel et al. and Turner et al. The multiwavelength photometry indicates a constant transit depth from near-UV to optical wavelengths in 10 targets (suggestive of clouds), and a varying transit depth with wavelength in 5 targets (hinting at Rayleigh or aerosol scattering in their atmospheres). We also present the first detection of a smaller near-UV transit depth than that measured in the optical in WASP-1b and a possible opacity source that can cause such radius variations is currently unknown. WASP-36b also exhibits a smaller near-UV transit depth at

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“…If they are not removed properly, they may seriously affect transit timing. To remove trends, a model that consists of a transit signal adopted from Maciejewski et al (2011) and a secondorder polynomial were fitted to each light curve analysed in this work. We used the jktebop code (Southworth et al 2004a,b), which is based on the ebop program (Etzel 1981;Popper & Etzel 1981) and allows photometric trends to be approximated with a polynomial up to order five.…”

Section: Light Curve Pre-processingmentioning

confidence: 99%

“…The host star was found to have an effective temperature of T eff = 6300 +200 −100 K and a mass of M * = 1.35 ± 0.14 M . Follow-up observations, primarily high-precision photometry, confirmed the large planetary radius (Maciejewski et al 2011;Chan et al 2011). The system parameters were also refined by Southworth (2012), who used highprecision literature data in a joint analysis.…”

Section: Introductionmentioning

confidence: 99%

Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin

Maciejewski

Dimitrov

Seeliger³

et al. 2013

A&A

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Aims. The transiting planet WASP-12 b was identified as a potential target for transit-timing studies because a departure from a linear ephemeris has been reported in the literature. Such deviations could be caused by an additional planet in the system. We attempt to confirm the claimed variations in transit timing and interpret their origin. Methods. We organised a multi-site campaign to observe transits by WASP-12 b in three observing seasons, using 0.5-2.6-metre telescopes. Results. We obtained 61 transit light curves, many of them with sub-millimagnitude precision. The simultaneous analysis of the best-quality datasets allowed us to obtain refined system parameters, which agree with values reported in previous studies. The residuals versus a linear ephemeris reveal a possible periodic signal that may be approximated by a sinusoid with an amplitude of 0.00068 ± 0.00013 d and period of 500 ± 20 orbital periods of WASP-12 b. The joint analysis of timing data and published radial velocity measurements results in a two-planet model that explains observations better than do single-planet scenarios. We hypothesise that WASP-12 b might not be the only planet in the system, and there might be the additional 0.1 M Jup body on a 3.6-d eccentric orbit. A dynamical analysis indicates that the proposed two-planet system is stable on long timescales.

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High-precision photometry of WASP-12 b transits

Cited by 49 publications

References 32 publications

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b

Ground-based near-UV observations of 15 transiting exoplanets: constraints on their atmospheres and no evidence for asymmetrical transits

Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin

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