Search Publications
Deep multi-survey classification of variable stars
Becker, I.; Pichara, K.; Aguirre, C.
During the last decade, a considerable amount of effort has been made to classify variable stars using different machine-learning techniques. Typically, light curves are represented as vectors of statistical descriptors or features that are used to train various algorithms. These features demand high computational power and can last from hours to …
New photometric analysis of five exoplanets: CoRoT-2b, HAT-P-12b, TrES-2b, WASP-12b, and WASP-52b
Erdem, Ahmet; Öztürk, Oǧuz
We report 12, 11, 9, 10, and 8 new transit light curves of CoRoT-2b, HAT-P-12b, TrES-2b, WASP-12b, and WASP-52b, respectively, obtained at Çanakkale Onsekiz Mart University Observatory and TÜBİTAK National Observatory in 2016 and 2017. These transit light curves were analysed using JKTEBOP code. Planetary radii of CoRoT-2b, HAT-P-12b, TrES-2b, WAS…
Bolometric corrections of stellar oscillation amplitudes as observed by the Kepler, CoRoT, and TESS missions
Lund, Mikkel N.
A better understanding of the amplitudes of stellar oscillation modes and surface granulation is essential for improving theories of mode physics and the properties of the outer convection zone of solar-like stars. A proper prediction of these amplitudes is also essential for appraising the detectability of solar-like oscillations for asteroseismi…
Transit analysis of the CoRoT-5, CoRoT-8, CoRoT-12, CoRoT-18, CoRoT-20, and CoRoT-27 systems with combined ground- and space-based photometry
Heras, A. M.; Casanova, V.; Fernández, M. +2 more
We have initiated a dedicated project to follow-up with ground-based photometry the transiting planets discovered by CoRoT in order to refine the orbital elements, constrain their physical parameters, and search for additional bodies in the system. From 2012 September to 2016 December we carried out 16 transit observations of six CoRoT planets (Co…
Spot evolution in the eclipsing binary CoRoT 105895502
Schmitt, J. H. M. M.; Czesla, S.; Wichmann, R. +1 more
Stellar activity is ubiquitous in late-type stars. The special geometry of eclipsing binary systems is particularly advantageous to study the stellar surfaces and activity. We present a detailed study of the 145 d CoRoT light curve of the short-period (2.17 d) eclipsing binary CoRoT 105895502. By means of light-curve modeling with Nightfall, we de…
A fractal analysis application of the pre-whitening technique to δ Scuti stars time series
Garrido, R.; Suárez, J. C.; de Franciscis, S. +4 more
Fractal fingerprints have been found recently in the light curves of several δ Scuti stars observed by Convection Rotation and planetary Transits(CoRoT) satellite. This sole fact might pose a problem for the detection of pulsation frequencies using classical pre-whitening techniques, but it is also a potentially rich source for information about p…
CSI 2264: Simultaneous optical and X-ray variability in the pre-main sequence stars of NGC 2264. II. Photometric variability, magnetic activity, and rotation in class III objects and stars with transition disks
Micela, G.; Stauffer, J.; Sciortino, S. +6 more
Context. Pre-main sequence stars are variable sources. In diskless stars this variability is mainly due to the rotational modulation of dark photospheric spots and active regions, as in main sequence stars even if associated with a stronger magnetic activity.
Aims: We aim at analyzing the simultaneous optical and X-ray variability in these st…
CoRoT-18 b: Analysis of High-Precision Transit Light Curves with Starspot Features
Heras, A. M.; Gondoin, P.; Schmidt, T. O. B. +4 more
When a planet occults a spotty area on a stellar surface, the flux increases and a characteristic feature in a light curve - a bump - is observed. Among the planets detected by the CoRoT-mission CoRoT-18 is especially interesting as it exhibited spot crossings that we have analyzed in detail. We used four ground-based observations obtained at a 1.…