Analyses of some exoplanets’ transits and transit timing variations
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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 Çanakkale 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.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).
Spitzer Space Telescope
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We present the Transit Monitoring in the South (TraMoS) project. TraMoS has monitored transits of 30 exoplanets with telescopes located in Chile since 2008, whit the following goals: (1) to refine the physical and/or orbital parameters of those exoplanet system, and (2) to search for variations in the mid-times of the transits and in other parameters such as orbital inclination or transit's depth, that could indicate the presence of additional bodies in the system. We highlight here the first results of TraMoS in three selected exoplanets.
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Light curves describe the luminosity, or flux, emitted by celestial bodies or systems over a period of time. Since light curves are mostly irregular and may contain spikes and dips caused by extraneous factors, they contain valuable information about various phenomena and trends in the observed planetary system. For instance, light curves often help detect exoplanets in a stars planetary system. Furthermore, they also help characterize solar flares, cataclysmic variables (CVs), and various other phenomena. This study collects data in the form of light curves from stars in planetary systems housing terrestrial exoplanets found on the NASA Exoplanet Catalog and explored various causes for variations in the planetary systems light curve. One significant finding from light curve analysis was the possible existence of instrumental noise on the Kepler telescope in quarter 10. However, a larger exoplanet sample size and a real significance test are required for confirmation. This study exemplifies the accessibility and therefore feasibility of gathering data, graphing, and analyzing light curves.
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As part of our ongoing effort to investigate transit timing variations (TTVs) of known exoplanets, we monitored transits of the four exoplanets HAT-P-18b, HAT-P-19b, HAT-P-27b/WASP-40b and WASP-21b. All of them are suspected to show TTVs due to the known properties of their host systems based on the respective discovery papers. During the past three years 46 transit observations were carried out, mostly using telescopes of the Young Exoplanet Transit Initiative. The analyses are used to refine the systems' orbital parameters. In all cases we found no hints for significant TTVs, or changes in the system parameters inclination, fractional stellar radius and planet-to-star radius ratio. However, comparing our results with those available in the literature shows that we can confirm the already published values.
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Abstract Exoplanets are planets that orbit stars other than our Sun, and the most common way of detecting them is by the transit method. This method consists of plotting the relative brightness of the exoplanets host star against a comparison star to make what is known as a light curve. Periodic dips in the light curve could correspond to the exoplanet coming in front of its host star, and blocking some of its light. One time of great importance to constantly keep up to date is the exoplanets mid-transit time. The mid-transit time is the time in which the exoplanet is in the middle of its transit; however, the problem with this value is that it changes over many periods due to the uncertainty in the period of the planet. Thus, it is important to update transit timings as incorrect timings can hinder observations from expensive telescopes. Crowdsourcing exoplanet transit analysis is a great opportunity to help these large telescopes and get the community involved in exoplanet research. In this study, six citizen scientists from the East Bay Astronomical Society (EAS) performed a transit analysis of HATS-4 b using the Exoplanet Transit Interpretation Code (EXOTIC). Using newly calculated mid-transit times, we were able to see how off the expected mid-transit time based on the existing mid-transit time on the NASA Exoplanet Archive was by calculating the phase difference.
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We report the discovery of photometric oscillations in the host star of the exoplanet WASP-33 b (HD 15082). The data were obtained in the R band both in transit and out-of-transit phases from the Montcabrer (0.3-m telescope) and Montsec (0.8-m telescope) observatories. Proper fitting and subsequent removal of the transit signal reveals stellar photometric variations wit h an amplitude of
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Transit Analysis of Exoplanets TrES-5 b and WASP-43 b with the EXOplanet Transit Interpretation Code
In this study, we analyze light curves and corresponding transit attributes of the exoplanets TrES-5b and WASP-43b. The mid-transit time of an exoplanet is the time in which the planet is in the middle of its transit. Over time, due to variations that arise after many periods, the error in the mid-transit time of the exoplanet increases. Because of this, constant observations of exoplanet mid-transit times through light curves are necessary to update the transit timing predictions. We made light curves with the EXOplanet Transit Interpretation Code (EXOTIC). To run with EXOTIC, we were given raw, uncalibrated TrES-5b images taken by the SRO telescope, managed by the Boyce-Astro project. Additionally, we requested and obtained images of WASP-43b using the Las Cumbres Observatory 0.4 m robotic telescopes. Within this work, we will explore the newly calculated mid-transit times and other transit properties to gain a better understanding of TrES-5b and WASP-43b.
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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 Çanakkale 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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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 Çanakkale Onsekiz Mart University Observatory and TÜBİTAK 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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