Search Publications
A search for tight hierarchical triple systems amongst the eclipsing binaries in the CoRoT fields
Klagyivik, P.; Borkovits, T.; Benkő, J. M. +5 more
We report a comprehensive search for hierarchical triple stellar system candidates amongst eclipsing binaries (EBs) observed by the CoRoT spacecraft. We calculate and check eclipse timing variation (ETV) diagrams for almost 1500 EBs in an automated manner. We identify five relatively short period Algol systems for which our combined light-curve an…
A comprehensive study of young B stars in NGC 2264 . I. Space photometry and asteroseismology
Fossati, L.; Przybilla, N.; Nieva, M. -F. +9 more
Context. Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude level and permit a search for slowly pulsating B (SPB)-type pulsation among objects that are only a few million years old.
Aims: Our goal is to conduct a homo…
Evidence of chaotic modes in the analysis of four δ Scuti stars
García, R. A.; García Hernández, A.; Roca Cortés, T. +1 more
Context. Since CoRoT observations unveiled the very low amplitude modes that form a flat plateau in the power spectrum structure of δ Scuti stars, the nature of this phenomenon, including the possibility of spurious signals due to the light curve analysis, has been a matter of long-standing scientific debate.
Aims: We contribute to this debat…
Limits to the presence of transiting circumbinary planets in CoRoT Data
Csizmadia, Sz.; Cabrera, J.; Klagyivik, P. +2 more
Aims: During its flight phase, from 2007-2012, the CoRoT mission delivered light curves for over 2000 eclipsing binaries. Data from the Kepler mission have proven the existence of several transiting circumbinary planets. While light curves from CoRoT typically have lower precision and shorter coverage, the number of CoRoT targets is similar t…
Semi-empirical seismic relations of A-F stars from COROT and Kepler legacy data
Moya, A.; Suárez, J. C.; García Hernández, A. +1 more
Asteroseismology is witnessing a revolution, thanks to high-precise asteroseismic space data (MOST, COROT, Kepler, BRITE) and their large ground-based follow-up programs. Those instruments have provided an unprecedented large amount of information, which allows us to scrutinize its statistical properties in the quest for hidden relations among pul…
CSI 2264: Simultaneous optical and X-ray variability in pre-main sequence stars. I. Time resolved X-ray spectral analysis during optical dips and accretion bursts in stars with disks
Micela, G.; Stauffer, J.; Sciortino, S. +6 more
Context. Pre-main sequence stars are variable sources. The main mechanisms responsible for their variability are variable extinction, unsteady accretion, and rotational modulation of both hot and dark photospheric spots and X-ray-active regions. In stars with disks, this variability is related to the morphology of the inner circumstellar region (≤…
CoRoT 223992193: Investigating the variability in a low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
Aigrain, S.; Gandolfi, D.; Bouvier, J. +10 more
CoRoT 223992193 is the only known low-mass, pre-main sequence eclipsing binary that shows evidence of a circumbinary disk. The system displays complex photometric and spectroscopic variability over a range of timescales and wavelengths. Using two optical CoRoT runs from 2008 and 2011/2012 (spanning 23 and 39 days), along with infrared Spitzer 3.6 …
A deeper view of the CoRoT-9 planetary system. A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering
Aigrain, S.; Alonso, R.; Bordé, P. +27 more
Exploring the Helium Core of the δ Scuti Star CoRoT 102749568 with Asteroseismology
Li, Yan; Chen, Xinghao; Chen, Yanhui +2 more
Based on regularities in rotational splitting, we seek possible multiplets for the observed frequencies of CoRoT 102749568. There are 21 sets of multiplets identified, including four sets of multiplets with l = 1, nine sets of multiplets with l = 2, and eight sets of multiplets with l = 3. In particular, there are three complete triplets (f10…
Photometric and spectroscopic variability of the B5IIIe star HD 171219
Poretti, E.; Rainer, M.; Uytterhoeven, K. +11 more
We analyzed the star HD 171219, one of the relatively bright Be stars observed in the seismo field of the CoRoT satellite, in order to determine its physical and pulsation characteristics. Classical Be stars are main-sequence objects of mainly B-type, whose spectra show, or have shown at some epoch, Balmer lines in emission and an infrared excess.…