Search Publications
Effects of coronal mass ejection orientation on its propagation in the heliosphere
Temmer, M.; Vršnak, B.; Dumbović, M. +3 more
Context. In the scope of space weather forecasting, it is crucial to be able to more reliably predict the arrival time, speed, and magnetic field configuration of coronal mass ejections (CMEs). From the time a CME is launched, the dominant factor influencing all of the above is the interaction of the interplanetary CME (ICME) with the ambient plas…
Small-scale EUV features as the drivers of coronal upflows in the quiet Sun
Teriaca, Luca; Long, David M.; Schühle, Udo +18 more
Context. Coronal upflows in the quiet Sun are seen in a wide range of features, including jets and filament eruptions. The in situ measurements from Parker Solar Probe within ≈0.2 au have demonstrated that the solar wind is highly structured, showing abrupt and near-ubiquitous magnetic field reversals (i.e., switchbacks) on different timescales. T…
To grow old and peculiar: Survey of anomalous variable stars in M80 with age determinations using K2 and Gaia
Pál, András; Kinemuchi, Karen; Kollmeier, Juna A. +11 more
The globular cluster Messier 80 was monitored by the Kepler space telescope for 80 days during the K2 mission. Continuous, high-precision photometry of such an old, compact cluster allows us for studies of its variable star population in unprecedented detail. We used differential-image photometry to extract light curves for 27 variable stars A sea…
Asteroseismic modelling strategies in the PLATO era. I. Mean density inversions and direct treatment of the seismic information
Bétrisey, J.; Buldgen, G.; Reese, D. R. +6 more
Context. Asteroseismology experienced a breakthrough in the last two decades thanks to the so-called photometry revolution with space-based missions such as CoRoT, Kepler, and TESS. Because asteroseismic modelling will be part of the pipeline of the future PLATO mission, it is relevant to compare some of the current modelling strategies and discus…
A review of planetary systems around HD 99492, HD 147379, and HD 190007 with HARPS-N
Poretti, E.; Sozzetti, A.; Delisle, J. -B. +26 more
Context. The Rocky Planet Search (RPS) program is dedicated to a blind radial velocity (RV) search of planets around bright stars in the northern hemisphere, using the high-resolution echelle spectrograph HARPS-N installed on the Telescopio Nazionale Galileo (TNG).
Aims: The goal of this work is to revise and update the properties of three pl…
The Outer spiral arm of the Milky Way using red clump stars. Tracing the asymmetry across the disc
Ganesh, Shashikiran; Schultheis, Mathias; Uppal, Namita
Aims: Our aim is to provide an observational view of the old disc structure of the Milky Way galaxy using the distribution of red clump (RC) stars. The spiral arms, warp structure, and other asymmetries present in the disc are revisited using a systematic study of RC star counts over the disc of the Galaxy.
Methods: We developed a method…
Gaia view of primitive inner-belt asteroid families. Searching for the origins of asteroids Bennu and Ryugu
Delbo, M.; Avdellidou, C.; Walsh, K. J.
Aims: The near-Earth asteroids Ryugu and Bennu were visited, characterised, and sampled by the Hayabusa2 and OSIRIS-REx missions, where remote sensing data and sample return analysis showed that both asteroids have primitive, hydrated, and organic-rich compositions. The dark families of the inner main belt that belong to the spectroscopic C-c…
Asteroids' reflectance from Gaia DR3: Artificial reddening at near-UV wavelengths
Tatsumi, E.; Tanga, P.; De Angeli, F. +6 more
Context. Observational and instrumental difficulties observing small bodies below 0.5 µm make this wavelength range poorly studied compared with the visible and near-infrared. Furthermore, the suitability of many commonly used solar analogues, essential in the computation of asteroid reflectances, is usually assessed only in visible waveleng…
Enhancing the alignment of the optically bright Gaia reference frame with respect to the International Celestial Reference System
Xu, Ming H.; Anderson, James M.; Lunz, Susanne +4 more
Context. The link of the Gaia frame in terms of non-rotation with respect to the International Celestial Reference System (ICRS), which is realized via very long baseline interferometry (VLBI) at radio wavelengths, has to be conducted for the wide range of optical magnitudes in which the spacecraft observes. There is a sufficient number of suitabl…
The Yarkovsky effect and bulk density of near-Earth asteroids from Gaia DR3
Oszkiewicz, Dagmara; Tanga, Paolo; Carry, Benoit +3 more
Aims: The primary objective of this study is to utilize Gaia DR3 asteroid astrometry to detect the Yarkovsky effect, a non-gravitational acceleration that affects the orbits of small asteroids. We then computed the bulk densities for the sample of objects for which we obtained an estimation of the Yarkovsky effect.
Methods: We used the v…