Search Publications
Mitigating flicker noise in high-precision photometry. I. Characterization of the noise structure, impact on the inferred transit parameters, and predictions for CHEOPS observations
Veronig, A.; Fossati, L.; Lendl, M. +4 more
Context. In photometry, the short-timescale stellar variability ("flicker"), such as that caused by granulation and solar-like oscillations, can reach amplitudes comparable to the transit depth of Earth-sized planets and is correlated over the typical transit timescales. It can introduce systematic errors on the inferred planetary parameters when …
Analysing the spectral energy distributions of Galactic classical Cepheids
Groenewegen, M. A. T.
Spectral energy distributions (SEDs) were constructed for a sample of 477 classical Cepheids (CCs); including stars that have been classified in the literature as such but are probably not. The SEDs were fitted with a dust radiative transfer code. Four stars showed a large mid- or far-infrared excess and the fitting then included a dust component.…
Nonparametric galaxy morphology from UV to submm wavelengths
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +13 more
We present the first nonparametric morphological analysis of a set of spiral galaxies from UV to submillimeter (submm) wavelengths. Our study is based on high-quality multi-wavelength imaging for nine well-resolved spiral galaxies from the DustPedia database, combined with nonparametric morphology indicators calculated in a consistent way using th…
Molecular gas in CLASH brightest cluster galaxies at z ∼ 0.2 - 0.9
Jablonka, P.; Castignani, G.; Combes, F. +4 more
Brightest cluster galaxies (BCGs) are excellent laboratories for the study of galaxy evolution in dense Mpc-scale environments. We used the IRAM-30 m to observe, in CO(1→0), CO(2→1), CO(3→2), or CO(4→3), 18 BCGs at z ∼ 0.2 - 0.9 drawn from the Cluster Lensing And Supernova survey with Hubble (CLASH) survey. Our sample includes RX1532, which is our…
SPInS, a pipeline for massive stellar parameter inference. A public Python tool to age-date, weigh, size up stars, and more
Reese, D. R.; Lebreton, Y.
Context. Stellar parameters are required in a variety of contexts, ranging from the characterisation of exoplanets to Galactic archaeology. Among them, the age of stars cannot be directly measured, while the mass and radius can be measured in some particular cases (e.g. binary systems, interferometry). More generally, stellar ages, masses, and rad…
Asymmetric expansion of coronal mass ejections in the low corona
Cremades, H.; Iglesias, F. A.; Merenda, L. A.
Aims: Understanding how magnetic fields are structured within coronal mass ejections (CMEs), and how they evolve from the low corona into the heliosphere, is a major challenge for space weather forecasting and for solar physics. The study of CME morphology is a particularly auspicious approach to this problem, given that it holds a close rela…
Tracing the anemic stellar halo of M 101
Bell, Eric F.; Holwerda, Benne W.; Monachesi, Antonela +3 more
Models of galaxy formation in a cosmological context predict that massive disk galaxies should have structured extended stellar halos. Recent studies in integrated light, however, report that a few galaxies, including the nearby disk galaxy M 101, have no measurable stellar halos to the detection limit. We aim to quantify the stellar content and s…
Plasma characterization at comet 67P between 2 and 4 AU from the Sun with the RPC-MIP instrument
Henri, Pierre; Vallières, Xavier; Deca, Jan +2 more
The plasma of comet 67P/Churyumov-Gerasimenko is analyzed based on the RPC-MIP mutual impedance probe data of the Rosetta mission. Numerical simulations of the RPC-MIP instrumental response considering two populations of electrons were fit on experimental responses acquired from January to September 2016 to extract the electron densities and tempe…
A multi-chord stellar occultation by the large trans-Neptunian object (174567) Varda
Berthier, J.; Carry, B.; Souami, D. +41 more
Context. We present results from the first recorded stellar occultation by the large trans-Neptunian object (174567) Varda that was observed on September 10, 2018. Varda belongs to the high-inclination dynamically excited population, and has a satellite, Ilmarë, which is half the size of Varda.
Aims: We determine the size and albedo of Varda …
Structure of the outer Galactic disc with Gaia DR2
López-Corredoira, M.; Chrobáková, Ž.; Nagy, R.
Context. The structure of outer disc of our Galaxy is still not well described, and many features need to be better understood. The second Gaia data release (DR2) provides data in unprecedented quality that can be analysed to shed some light on the outermost parts of the Milky Way.
Aims: We calculate the stellar density using star counts obta…