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Detection of period-spacing patterns due to the gravity modes of rotating dwarfs in the TESS southern continuous viewing zone
Garcia, S.; De Ridder, J.; Aerts, C. +3 more
Context. The theory of stellar evolution presents shortcomings when confronted with asteroseismic probes of interior physical properties. The differences between observations and theory are often great because stellar models have mainly been calibrated from observables connected to the surface of stars. Period-spacing patterns caused by gravity mo…
The Visual Survey Group: A Decade of Hunting Exoplanets and Unusual Stellar Events with Space-based Telescopes
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +9 more
This article presents the history of the Visual Survey Group (VSG)-a Professional-Amateur (Pro-Am) collaboration within the field of astronomy working on data from several space missions (Kepler, K2 and Transiting Exoplanet Survey Satellite). This paper covers the formation of the VSG, its survey-methods including the most common tools used and it…
Constraining Global Coronal Models with Multiple Independent Observables
Poirier, Nicolas; Kouloumvakos, Athanasios; Rouillard, Alexis P. +13 more
Global coronal models seek to produce an accurate physical representation of the Sun's atmosphere that can be used, for example, to drive space-weather models. Assessing their accuracy is a complex task, and there are multiple observational pathways to provide constraints and tune model parameters. Here, we combine several such independent constra…
Eclipsing white dwarf binaries in Gaia and the Zwicky Transient Facility
Belokurov, Vasily; Breedt, Elmé; Hodgkin, Simon +4 more
Gaia provided the largest ever catalogue of white dwarf stars. We use this catalogue, along with the third public data release of the Zwicky Transient Facility (ZTF), to identify new eclipsing white dwarf binaries. Our method exploits light-curve statistics and the box least-squares algorithm to detect periodic light-curve variability. The search …
A New 3D Solar Wind Speed and Density Model Based on Interplanetary Scintillation
Bzowski, M.; Tokumaru, M.; Porowski, C.
The solar wind (SW) is an outflow of the solar coronal plasma, which expands supersonically throughout the heliosphere. SW particles interact by charge exchange with interstellar neutral atoms; on the one hand, they modify the distribution of this gas in interplanetary space, and, on the other hand, they are the seed populations for heliospheric p…
Linking chromospheric activity and magnetic field properties for late-type dwarf stars
Petit, P.; Vidotto, A. A.; Jeffers, S. V. +9 more
Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric $\log {R^{\prime }_{\rm {HK}}}$ activity and the surface-averaged longitudinal magnetic field, Bl, giving the opportunity to probe the relationship between large-scale stellar magnetic fields and chromospheric manifestations of magnetism. We present $\lo…
A self-consistent dynamical model of the Milky Way disc adjusted to Gaia data
Figueras, F.; Reylé, C.; Mor, R. +6 more
Context. Accurate astrometry achieved by Gaia for many stars in the Milky Way provides an opportunity to reanalyse the Galactic stellar populations from a large and homogeneous sample and to revisit the Galaxy gravitational potential.
Aims: This paper shows how a self-consistent dynamical model can be obtained by fitting the gravitational pot…
Gaia EDR3 distances of the young stellar clusters in the extended Carina Nebula complex
Preibisch, T.; Göppl, C.
Context. The Carina Nebula complex (CNC) is one of the most massive and active star-forming regions in our Galaxy and it contains several large young star clusters. The distances of the individual clusters and their physical connection were poorly known up to now, with strongly discrepant results reported in the literature.
Aims: We want to d…
Two long-period transiting exoplanets on eccentric orbits: NGTS-20 b (TOI-5152 b) and TOI-5153 b
Bouchy, F.; Queloz, D.; Henning, T. +50 more
Context. Long-period transiting planets provide the opportunity to better understand the formation and evolution of planetary systems. Their atmospheric properties remain largely unaltered by tidal or radiative effects of the host star, and their orbital arrangement reflects a different and less extreme migrational history compared to close-in obj…
Deriving ages and horizontal branch properties of integrated stellar populations
Conroy, Charlie; Cabrera-Ziri, Ivan
A major source of uncertainty in the age determination of old (~10 Gyr) integrated stellar populations is the presence of hot horizontal branch (HB) stars. Here, we describe a simple approach to tackle this problem, and show the performance of this technique that simultaneously models the age, abundances, and HB properties of integrated stellar po…