Publications (18)
The surface composition of six newly discovered chemically peculiar stars. Comparison to the HgMn stars Lep and Scl and the superficially normal B star Cap
Richard Monier, E. Niemczura, D. W. Kurtz +10
We report on a detailed abundance study of six bright, mostly southern, slowly rotating late B stars: HD~1279 (B8III), HD~99803 (B9V), HD~123445 (B9V), HD~147550 (B9V), HD~171961 (…
The PLATO Mission
Heike Rauer, Conny Aerts, Juan Cabrera +842
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large numb…
Fingering convection induced by atomic diffusion in stars: 3D numerical computations and applications to stellar models
Varvara Zemskova, Pascale Garaud, Morgan Deal +1
Iron-rich layers are known to form in the stellar subsurface through a combination of gravitational settling and radiative levitation. Their presence, nature and detailed structure…
Accretion of planetary matter and the lithium problem in the 16 Cygni stellar system
Morgan Deal, Olivier Richard, Sylvie Vauclair
The 16 Cyg system is composed of two solar analogs with similar masses and ages. A red dwarf is in orbit around 16 Cyg A whereas 16 Cyg B hosts a giant planet. The abundances of he…
The impact of the transport of chemicals and electronic screening on helioseismic and neutrino observations in solar models
Morgan Deal, Gaël Buldgen, Louis Manchon +3
The transport of chemical elements in stellar interiors is one of the greatest sources of uncertainties of solar and stellar modelling. The Sun, with its exquisite spectroscopic, h…
The Gaia-ESO survey: 3D NLTE abundances in the open cluster NGC 2420 suggest atomic diffusion and turbulent mixing at the origin of chemical abundance variations
Ekaterina Semenova, Maria Bergemann, Morgan Deal +10
Atomic diffusion and mixing processes in stellar interiors influence the structure and the surface composition of stars. Some of these processes cannot yet be modelled from the fir…
Revisiting the Red-giant Branch Hosts KOI-3886 and Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
Tiago L. Campante, Tanda Li, J. M. Joel Ong +23
Asteroseismology is playing an increasingly important role in the characterization of red-giant host stars and their planetary systems. Here, we conduct detailed asteroseismic mode…
A 20-Second Cadence View of Solar-Type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Re-characterization of pi Men c
Daniel Huber, Timothy R. White, Travis S. Metcalfe +50
We present an analysis of the first 20-second cadence light curves obtained by the TESS space telescope during its extended mission. We find a precision improvement of 20-second da…
Characterisation of FG-type stars with an improved transport of chemical elements
Nuno Moedas, Diego Bossini, Morgan Deal +1
Context. The modelling of chemical transport mechanisms is crucial for accurate stellar characterizations. Atomic diffusion is one of these processes and it is commonly included in…
The unexpected optical and ultraviolet variability of the standard star Sex (HD 87887)
Richard Monier, Dominic M. Bowman, Yveline Lebreton +1
The analysis of the available TESS light curves of Sex (HD 87887) reveals low-frequency pulsations with a period of about 9.1 hours in this spectroscopic A0 III standard star.…
Atomic diffusion and turbulent mixing in solar-like stars: Impact on the fundamental properties of FG-type stars
Nuno Moedas, Morgan Deal, Diego Bossini +1
Chemical composition is an important factor that affects stellar evolution. The element abundance on the stellar surface evolves along the lifetime of the star because of transport…
Magnetic geometry and surface differential rotation of the bright Am star Alhena A
Aurore Blazère, Pascal Petit, Coralie Neiner +5
Alhena A ( Gem A) is a bright Am star, with the strongest disc-integrated magnetic field strength reported so far for an Am star. Its spectrum exhibits standard circularly pola…
Impact of radiative accelerations on the stellar characterization of FGK-type stars using spectroscopic and seismic constraints
Nuno Moedas, Morgan Deal, Diego Bossini
Chemical transport mechanisms are fundamental processes in stellar evolution models. They are responsible for the chemical distribution, and their impact determines how accurately…
Towards characterising rocky worlds: Trends in chemical make-ups of M dwarfs versus GK dwarfs
Haiyang S. Wang, Sascha P. Quanz, Suvrath Mahadevan +1
Elemental abundances of Sun-like stars are crucial for understanding the detailed properties of their planets. However, measuring elemental abundances in M stars is challenging due…
The Future of Solar modelling: requirements for a new generation of solar models
Gael Buldgen, Gloria. Canocchi, Arthur. Le Saux +22
Helioseismology and solar modelling have enjoyed a golden era thanks to decades-long surveys from ground-based networks such as for example GONG, BiSON, IRIS and the SOHO and SDO s…
Robust asteroseismic properties of the bright planet host HD 38529
Warrick H. Ball, William J. Chaplin, Martin B. Nielsen +21
The Transiting Exoplanet Survey Satellite (TESS) is recording short-cadence, high duty-cycle timeseries across most of the sky, which presents the opportunity to detect and study o…
Helioseismic inference of the solar radiative opacity
Gaël Buldgen, Jean-Christophe Pain, Philippe Cossé +18
The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current deb…
Atomic diffusion in solar-like stars with MESA. Comparison with the Montreal/Montpellier and CESTAM stellar evolution codes
Bernardo Campilho, Morgan Deal, Diego Bossini
The stellar evolution code Modules for Experiments in Stellar Astrophysics (MESA) is public and is widely used by the community. It includes the possibility of taking several non-s…