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Kepler Object of Interest Network I. First results combining ground- and space-based observations of Kepler systems with transit timing variations

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dc.contributor.author Von Essen, C
dc.contributor.author Ofir, A
dc.contributor.author Dreizler, S
dc.contributor.author Agol, E
dc.contributor.author Freudenthal, J
dc.contributor.author Hernández, J
dc.contributor.author Wedemeyer, S
dc.contributor.author Parkash, V
dc.contributor.author Deeg, H. J
dc.contributor.author Hoyer, S
dc.contributor.author Morris, B. M
dc.contributor.author Becker, A. C
dc.contributor.author Sun, L
dc.contributor.author Gu, S. H
dc.contributor.author Herrero, E
dc.contributor.author Tal-Or, L
dc.contributor.author Poppenhaeger, K
dc.contributor.author Mallonn, M
dc.contributor.author Albrecht, S
dc.contributor.author Khalafinejad, S
dc.contributor.author Boumis, P
dc.contributor.author Delgado-Correal, C
dc.contributor.author Fabrycky, D. C
dc.contributor.author Janulis, R
dc.contributor.author Lalitha, S
dc.contributor.author Liakos, A
dc.contributor.author Mikolaitis, S
dc.contributor.author Moyano D-Angelo, M. L
dc.contributor.author Sokov, E
dc.contributor.author Pakstiene, E
dc.contributor.author Popov, A
dc.contributor.author Krushinsky, V
dc.contributor.author Ribas, I
dc.contributor.author Rodríguez S, M. M
dc.contributor.author Rusov, S
dc.contributor.author Sokova, I
dc.contributor.author Tautvaisiene, G
dc.contributor.author Wang, X
dc.date.accessioned 2020-11-12T15:02:13Z
dc.date.available 2020-11-12T15:02:13Z
dc.date.issued 2018-07
dc.identifier.citation Astronomy & Astrophysics, Vol. 615, A79 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6946
dc.description Open Access © ESO https://doi.org/10.1051/0004-6361/201732483 en_US
dc.description.abstract During its four years of photometric observations, the Kepler space telescope detected thousands of exoplanets and exoplanet candidates. One of Kepler’s greatest heritages has been the confirmation and characterization of hundreds of multi-planet systems via transit timing variations (TTVs). However, there are many interesting candidate systems displaying TTVs on such long timescales that the existing Kepler observations are of insufficient length to confirm and characterize them by means of this technique. To continue with Kepler’s unique work, we have organized the “Kepler Object of Interest Network” (KOINet), a multi-site network formed of several telescopes located throughout America, Europe, and Asia. The goals of KOINet are to complete the TTV curves of systems where Kepler did not cover the interaction timescales well, to dynamically prove that some candidates are true planets (or not), to dynamically measure the masses and bulk densities of some planets, to find evidence for non-transiting planets in some of the systems, to extend Kepler’s baseline adding new data with the main purpose of improving current models of TTVs, and to build a platform that can observe almost anywhere on the northern hemisphere, at almost any time. KOINet has been operational since March 2014. Here we show some promising first results obtained from analyzing seven primary transits of KOI-0410.01, KOI-0525.01, KOI-0760.01, and KOI-0902.01, in addition to the Kepler data acquired during the first and second observing seasons of KOINet. While carefully choosing the targets we set demanding constraints on timing precision (at least 1 min) and photometric precision (as good as one part per thousand) that were achieved by means of our observing strategies and data analysis techniques. For KOI-0410.01, new transit data revealed a turnover of its TTVs. We carried out an in-depth study of the system, which is identified in the NASA Data Validation Report as a false positive. Among others, we investigated a gravitationally bound hierarchical triple star system and a planet–star system. While the simultaneous transit fitting of ground- and space-based data allowed for a planet solution, we could not fully reject the three-star scenario. New data, already scheduled in the upcoming 2018 observing season, will set tighter constraints on the nature of the system. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Instrumentation en_US
dc.subject Photometers-methods en_US
dc.subject Data analysis-techniques en_US
dc.subject Photometric-planets and satellites en_US
dc.subject Dynamical evolution and stability en_US
dc.title Kepler Object of Interest Network I. First results combining ground- and space-based observations of Kepler systems with transit timing variations en_US
dc.type Article en_US


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