Search Publications
TV Mon - post-mass transfer Algol-type binary with δ Scuti pulsations in primary component
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +4 more
We present a study of the detached eclipsing binary TV Mon using spectra from the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) medium-resolution survey, ASAS-SN (All Sky Automated Survey for SuperNovae), and CoRoT (Convection, Rotation and planetary Transits) photometry. We apply multiple-epochs spectral fitting to derive rad…
Improved radius determinations for the transiting brown dwarf population in the era of Gaia and TESS
Carmichael, Theron W.
I report updates to the substellar mass-radius diagram for 11 transiting brown dwarfs (BDs) and low-mass stars published before the third data release from the Gaia mission (Gaia DR3). I re-analyse these transiting BD systems whose physical parameters were published between 2008 and 2019 and find that when using the parallax measurements from Gaia…
Modelling simultaneous CoRoT and Spitzer light curves: the impact of bending waves in the inner disc
Nagel, E.; Bouvier, J.
We present a physical interpretation of the amplitude of light curves of young stellar objects (YSOs) simultaneously observed in the infrared with the Spitzer Space Telescope and in the optical with the CoRoT satellite. The modelled objects come from a sample of YSOs in the star forming region NGC 2264, and we focus on a subsample showing periodic…
The magnetic field and magnetosphere of Plaskett's star: a fundamental shift in our understanding of the system
Wade, G. A.; Neiner, C.; Alecian, E. +7 more
Plaskett's 'star' appears to be one of a small number of short-period binary systems known to contain a hot, massive, magnetic star. We combine an extensive spectropolarimetric (Stokes V) data set with archival photometry and spectropolarimetry to establish the essential characteristics of the magnetic field and magnetosphere of the rapidly rotati…
Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b
Alonso, R.; Bouchy, F.; Deleuil, M. +18 more
Theories of planet formation give contradicting results of how frequent close-in giant planets of intermediate mass stars (IMSs; $1.3\le M_{\star }\le 3.2\, \mathrm{M}_{\odot }$) are. Some theories predict a high rate of IMSs with close-in gas giants, while others predict a very low rate. Thus, determining the frequency of close-in giant planets o…
CoRoT-TESS eclipsing binaries with light-travel-time effect
Bódi, A.; Hajdu, T.; Matécsa, B. +1 more
Identifying long-period eclipsing binaries with space-based photometry is still a challenge even in the century of space telescopes due to the relatively short observation sequences and short lifetime of these missions. The Transiting Exoplanet Survey Satellite (TESS) space telescope is an appropriate tool to supplement previous space-based observ…
Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis
Baudin, F.; Samadi, R.; Morel, T. +8 more
Solar analogues are important stars to study for understanding the properties of the Sun. Combined with seismic and spectroscopic analysis, evolutionary modelling becomes a powerful method to characterize stellar intrinsic parameters, such as mass, radius, metallicity and age. However, these characteristics, relevant for other aspects of astrophys…
Fundamental properties of stars from Kepler and Gaia data: parallax offset and revised scaling relations
Örtel, S.; Yıldız, M.
Data from the space missions Gaia, Kepler, CoRoT and TESS, make it possible to compare parallax and asteroseismic distances. From the ratio of two densities ρsca/ρπ, we obtain an empirical relation fΔν between the asteroseismic large frequency separation and mean density, which is important for more accurate stella…
Study of the low-order Δν-ρ¯ relation for moderately rotating δ Scuti stars and its impact on their characterization
Suárez, J. C.; García Hernández, A.; Rodón, J. R. +1 more
The large separation in the low-radial order regime is considered as a highly valuable observable to derive mean densities of δ Scuti stars, due to its independence with rotation. Up to now, theoretical studies of this Δν- ${\bar{\rho}}$ relation have been limited to 1D non-rotating models and 2D pseudo-evolutionary models. The present work aims a…
Streaming classification of variable stars
Protopapas, P.; Zorich, L.; Pichara, K.
In the last years, automatic classification of variable stars has received substantial attention. Using machine learning techniques for this task has proven to be quite useful. Typically, machine learning classifiers used for this task require to have a fixed training set, and the training process is performed offline. Upcoming surveys such as the…