POSSIBLE TRANSIT TIMING VARIATIONS OF THE TrES-3 PLANETARY SYSTEM

Jiang, Ing-Guey; Yeh, Li-Chin; Thakur, Parijat; Wu, Yu-Ting; Chien, Ping; Lin, Yi-Ling; Chen, Hongyu; Hu, Jiumei; Sun, Zhan-Li; Ji, Jianghui

doi:10.1088/0004-6256/145/3/68

Cited by 47 publications

(28 citation statements)

References 19 publications

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“…After some standard procedures such as flat-field corrections etc., we first use the IRAF task, daof ind, to pick bright stars and then the task, phot, to measure these stars' fluxes in each image. The light curves of these bright stars are thus determined (Jiang et al 2013, Sun et al 2015. In order to decide which stars could be comparison stars, we first choose those with higher brightness consistency as candidates, i.e.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

THE POSSIBLE ORBITAL DECAY AND TRANSIT TIMING VARIATIONS OF THE PLANET WASP-43b

Jiang

Lai

Savushkin

et al. 2016

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Motivated by the previously reported high orbital decay rate of the planet WASP-43b, eight newly transit light curves are obtained and presented. Together with other data in literature, we perform a self-consistent timing analysis with data covering a timescale of 1849 epochs. The results give an orbital decay rate dP/dt = −0.02890795 ± 0.00772547 sec/year, which is one order smaller than previous values. This slow decay rate corresponds to a normally assumed theoretical value of stellar tidal dissipation factor. In addition, through the frequency analysis, the transit timing variations presented here are unlikely to be periodic, but could be signals of a slow orbital decay.

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Section: Observations and Data Reductionmentioning

confidence: 99%

THE POSSIBLE ORBITAL DECAY AND TRANSIT TIMING VARIATIONS OF THE PLANET WASP-43b

Jiang

Lai

Savushkin

et al. 2016

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“…Specifically, in the optical, we present on-sky high-precision demonstrations on Penn State's PlaneWave CDK 24" telescope of 246 +176 −81 ppm in 30 minute bins. Also in the optical, we present diffuser-assisted observations performed on the Astrophysical Research Consortium (ARC) 3.5m Telescope at APO using the Astrophysical Research Consortium Telescope Imaging Camera (ARC-TIC) (Huehnerhoff et al 2016), of 16 Cyg A, and the transits of WASP 85 A b and TRES-3b, demonstrating precisions of 62 +26 −16 ppm, 180 +66 −41 ppm and ∼101ppm in 30 minute bins, respectively. Lastly, we present high-precision photometry in the near-infrared (NIR) on the 200" Hale telescope at Palomar using the Wide-field Infrared Camera (WIRC) (Wilson et al 2003), with a precision of 137 +64 −36 ppm in 30 minute bins.…”

Section: Introductionmentioning

confidence: 99%

Toward Space-like Photometric Precision from the Ground with Beam-shaping Diffusers

Stefánsson

Mahadevan

Hebb

et al. 2017

ApJ

122

134

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We demonstrate a path to hitherto unachievable differential photometric precisions from the ground, both in the optical and near-infrared (NIR), using custom-fabricated beam-shaping diffusers produced using specialized nanofabrication techniques. Such diffusers mold the focal plane image of a star into a broad and stable top-hat shape, minimizing photometric errors due to non-uniform pixel response, atmospheric seeing effects, imperfect guiding, and telescope-induced variable aberrations seen in defocusing. This PSF reshaping significantly increases the achievable dynamic range of our observations, increasing our observing efficiency and thus better averages over scintillation. Diffusers work in both collimated and converging beams. We present diffuser-assisted optical observations demonstrating -+ 62 16 26 ppm precision in 30minute bins on a nearby bright star 16 Cygni A (V = 5.95) using the ARC 3.5 m telescope-within a factor of ∼2 of Keplerʼs photometric precision on the same star. We also show a transit of WASP-85-Ab (V = 11.2) and TRES-3b (V = 12.4), where the residuals bin down to -+ 180 41 66 ppm in 30minute bins for WASP-85-Ab-a factor of ∼4 of the precision achieved by the K2 mission on this targetand to 101 ppm for TRES-3b. In the NIR, where diffusers may provide even more significant improvements over the current state of the art, our preliminary tests demonstrated -+ 3664 ppm precision for a K S =10.8 star on the 200 inchHale Telescope. These photometric precisions match or surpass the expected photometric precisions of TESS for the same magnitude range. This technology is inexpensive, scalable, easily adaptable, and can have an important and immediate impact on the observations of transits and secondary eclipses of exoplanets.

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“…In differential photometry, the target star's flux (or magnitude) is presented with respect to one or multiple comparison stars (e.g. Sariya et al 2013, Jiang et al 2013. The selected comparison stars should not be of a variable nature.…”

Section: The Data and Reduction Proceduresmentioning

confidence: 99%

Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b

Sariya,

Jiang,

et al. 2020

Preprint

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Considering the importance of investigating the transit timing variations (TTVs) of transiting exoplanets, we present a follow-up study of HAT-P-12b. We include six new light curves observed between 2011 and 2015 from three different observatories, in association with 25 light curves taken from the published literature. The sample of the data used, thus covers a time span of ∼ 10.2 years with a large coverage of epochs (1160) for the transiting events of the exoplanet HAT-P-12b. The light curves are used to determine the orbital parameters and conduct an investigation of possible transit timing variations. The new linear ephemeris shows a large value of reduced χ 2 , i.e. χ 2 red (23) = 7.93, and the sinusoidal fitting using the prominent frequency coming from a periodogram shows a reduced χ 2 around 4. Based on these values and the corresponding O − C diagrams, we suspect the presence of a possible non-sinusoidal TTV in this planetary system. Finally, we find that a scenario with an additional non-transiting exoplanet could explain this TTV with an even smaller reduced χ 2 value of around 2.

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POSSIBLE TRANSIT TIMING VARIATIONS OF THE TrES-3 PLANETARY SYSTEM

Cited by 47 publications

References 19 publications

THE POSSIBLE ORBITAL DECAY AND TRANSIT TIMING VARIATIONS OF THE PLANET WASP-43b

THE POSSIBLE ORBITAL DECAY AND TRANSIT TIMING VARIATIONS OF THE PLANET WASP-43b

Toward Space-like Photometric Precision from the Ground with Beam-shaping Diffusers

Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b

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