Multiple planets or exomoons in<i>Kepler</i>hot Jupiter systems with transit timing variations?

Szabo, Robert M.; Szabó, Gy. M.; Dálya, G.; Simon, A. E.; Hodosán, Gabriella; Kiss, L. L.

doi:10.1051/0004-6361/201220132

Cited by 63 publications

(58 citation statements)

References 36 publications

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“…This is suggestive of a 5:1 resonance driven by the tidal interaction between the spin of the star and its close, massive planetary companion (Szabó et al 2013). While there is already evidence of other systems locked on similar low-order resonances (Walkowicz & Basri 2013, Sect.…”

Section: Discussionmentioning

confidence: 91%

TASTE IV: Refining ephemeris and orbital parameters for HAT‐P‐20b and WASP‐1b

et al. 2014

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We present four new light curves of the transiting exoplanets WASP-1b and HAT-P-20b, observed within the TASTE (The Asiago Search for Transit timing variations of Exoplanets) project. We re-analyzed light curves from the literature in a homogeneous way, calculating a refined ephemeris and orbital-physical parameters for both objects. WASP-1b does not show any significant Transit Timing Variation signal at the 120 s level. As for HAT-P-20b, we detected a deviation from our re-estimated linear ephemeris that could be ascribed to the presence of a perturber or, more probably, to a previously unnoticed high level of stellar activity. The rotational period of HAT-P-20 A that we obtained from archival data (P rot 14.5 d), combined with its optical variability and strong emission of Ca ii H & K lines, is consistent with a young stellar age (< 1 Gyr) and support the hypothesis that stellar activity may be responsible of the measured deviations of the transit times.

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Section: Discussionmentioning

confidence: 91%

TASTE IV: Refining ephemeris and orbital parameters for HAT‐P‐20b and WASP‐1b

et al. 2014

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“…The following planets are mentioned in Mazeh et al (2013): KOI-823.01, KOI-1546.01, KOI-1459.01, and KOI-1285.01. The following are mentioned in Szabo et al (2013): KOI-256.01, KOI-823.01. While not all of the transit timing variations were measurable in Mazeh et al (2013), they were still concluded to be significant.…”

Section: Methods and Resultsmentioning

confidence: 99%

High-order harmonics in light curves of Kepler planets

Armstrong

Rein

2015

Monthly Notices of the Royal Astronomical Society: Letters

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The Kepler mission was launched in 2009 and has discovered thousands of planet candidates. In a recent paper, Esteves et al. (2013) found a periodic signal in the light curves of KOI-13 and HAT-P-7, with a frequency triple the orbital frequency of a transiting planet. We found similar harmonics in many systems with a high occurrence rate. At this time, the origins of the signal are not entirely certain.We look carefully at the possibility of errors being introduced through our data processing routines but conclude that the signal is real. The harmonics on multiples of the orbital frequency are a result of non-sinusoidal periodic signals. We speculate on their origin and generally caution that these harmonics could lead to wrong estimates of planet albedos, beaming mass estimates, and ellipsoidal variations.

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“…Their gravitational influence on the transiting planets is too small to be detected through TTVs. Interestingly, single hot or warm Jupiter candidates that exhibit TTV signals have been found in the Kepler sample (Szabó et al 2012). The frequency of hot Jupiter candidates with periodic TTVs is estimated to be 18%.…”

Section: Discussionmentioning

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

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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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Multiple planets or exomoons inKeplerhot Jupiter systems with transit timing variations?

Cited by 63 publications

References 36 publications

TASTE IV: Refining ephemeris and orbital parameters for HAT‐P‐20b and WASP‐1b

TASTE IV: Refining ephemeris and orbital parameters for HAT‐P‐20b and WASP‐1b

High-order harmonics in light curves of Kepler planets

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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