Yazar "Puskullu, Caglar" seçeneğine göre listele

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    Analyses of Some Exoplanets' Transits and Transit Timing Variations
    (Amer Inst Physics, 2017) Puskullu, Caglar; Soydugan, Faruk
    We present solutions of the transit light curves and transit timing variations (TTVs) analyses of the exoplanets HAT-P-5b, HAT-P-9b and HAT-P-25b. Transit light curves were collected at canakkale Onsekiz Mart University Observatory and TUBITAK National Observatory. The models were produced by WINFITTER program and stellar, planetary and orbital properties were obtained and discussed. We gave new transit times and generated TTVs with them by appending additional data based on Exoplanet Transit Database (ETD). Significant signals at the TTVs were also investigated.
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    Analysis of ground-based observations of some exoplanets
    (Canadian Science Publishing, Nrc Research Press, 2018) Puskullu, Caglar; Soydugan, Faruk
    We present analyses of the transit light curves and transit time measurements of the exoplanets HAT-P-3b, HD 189733b, and WASP-43b. Transit light curves were collected at Canakkale Onsekiz Mart University Observatory and TUBITAK National Observatory. The models were produced by WINFITTER code and stellar, planetary, and orbital properties were obtained and discussed. We searched for significant signals at the O-C diagrams generated with our transit times and additional data based on Exoplanet Transit Database.
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    Exoplanet system Kepler-2 with comparisons to Kepler-1 and 13
    (Springer, 2020) Rhodes, Michael D.; Puskullu, Caglar; Budding, Edwin; Banks, Timothy S.
    We have carried out an intensive study of photometric (Kepler Mission) and spectroscopic data on the system Kepler-2 (HAT-P-7A) using the dedicated software WinFitter 6.4. The mean individual data-point error of the normalized flux values for this system is 0.00015, leading to the model's specification for the mean reference flux to an accuracy of similar to 0.5 ppm. This testifies to the remarkably high accuracy of the binned data-set, derived from over 1.8 million individual observations. Spectroscopic data are reported with the similarly high-accuracy radial velocity amplitude measure of similar to 2 m s(-1). The analysis includes discussion of the fitting quality and model adequacy. Our derived absolute parameters for Kepler-2 are as follows: Mp (Jupiter) 1.80 +/- 0.13; R1.46 +/- 0.08x106 km; Rp km. These values imply somewhat larger and less condensed bodies than previously catalogued, but within reasonable error estimates of such literature parameters. We find also tidal, reflection and Doppler effect parameters, showing that the optimal model specification differs slightly from a 'cleaned' model that reduces the standard deviation of the similar to 3600 binned light curve points to less than 0.9 ppm. We consider these slight differences, making comparisons with the hot-Jupiter systems Kepler-1 (TrES-2) and 13. We confirm that the star's rotation axis must be shifted towards the line of sight, though how closely depends on what rotation velocity is adopted for the star. From joint analysis of the spectroscopic and photometric data we find an equatorial rotation speed of 11 +/- 3 km s(-1). A slightly brighter region of the photosphere that distorts the transit shape can be interpreted as an indication of the gravity effect at the rotation pole; however we note that the geometry for this does not match the spectroscopic result. We discuss this difference, rejecting the possibility that a real shift in the position of the rotation axis in the few years between the spectroscopic and photometric data-collection times.Alternative explanations are considered, but we conclude that renewed detailed observations are required to help settle these questions.
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    Photometric Analysis of the Exoplanet Containing System Kepler-491
    (Amer Inst Physics, 2017) Puskullu, Caglar; Soydugan, Faruk
    In this study, we present solutions of the transit light curves of the recently discovered planet Kepler-491h observed by Kepler space-telescope within a span of four years. In order to obtain stellar, planetary and orbital properties, WINFITTER code was applied to light curve data available at the NASA Exoplanet Archive (NEA). We also searched for significant signals at the transit timing variation (TIV).
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    Transit analysis of the exoplanet host Kepler-485
    (Canadian Science Publishing, Nrc Research Press, 2018) Puskullu, Caglar; Soydugan, Faruk
    In this study, we present solutions of the transit light curves of the recently discovered exoplanet Kepler-485b observed by the Kepler space telescope. To obtain stellar, planetary, and orbital properties, WINFITTER code was applied to transit light curve data, which are available at the NASA Exoplanet Archive (NEA).