Search Publications
Discovery of two promising isolated neutron star candidates in the SRG/eROSITA All-Sky Survey
Haberl, F.; Buckley, D. A. H.; Pires, A. M. +2 more
We report the discovery of the isolated neutron star (INS) candidates
A multi-technique approach to identifying and/or constraining radial-velocity substellar companions
Kiefer, F.; Lagrange, A. -M.; Rubini, P. +3 more
Context. Although more than one thousand substellar companions have already been detected with the radial velocity (RV) method, many new companions remain to be detected in the public RV archives.
Aims: We wish to use the archival data obtained with the ESO/HARPS spectrograph to search for substellar companions.
Methods: We used the astr…
Identifying Lyα emitter candidates with Random Forest: Learning from galaxies in the CANDELS survey
Castellano, M.; Pentericci, L.; Fynbo, J. P. U. +8 more
The physical processes that make a galaxy a Lyman alpha emitter have been extensively studied over the past 25 yr. However, the correlations between physical and morphological properties of galaxies and the strength of the Lyα emission line are still highly debated. Here, we investigate the correlations between the rest-frame Lyα equivalent width …
A sub-Neptune planet around TOI-1695 discovered and characterized with SPIRou and TESS
Carmona, A.; Donati, J. -F.; Winn, J. N. +39 more
TOI-1695 is a V-mag = 13 M-dwarf star from the northern hemisphere at 45 pc from the Sun, around which a 3.134-day periodic transit signal from a super-Earth candidate was identified in TESS photometry. With a transit depth of 1.3 mmag, the radius of candidate TOI-1695.01 was estimated by the TESS pipeline to be 1.82 R⊕ with an equilibr…
Milky Way globular clusters on cosmological timescales. II. Interaction with the Galactic centre
Berczik, Peter; Ishchenko, Maryna; Sobolenko, Margaryta +2 more
Aims: We estimate the dynamical evolution of the interaction of globular clusters' with the Galactic centre that dynamically changed in the past.
Methods: We simulated the orbits of 147 globular clusters over a 10 Gyr lookback time using the parallel N-body code `φ-GPU'. For each globular cluster, we generated 1000 sets of initial data w…
Unbound stars hold the key to young star cluster history
Pfalzner, Susanne; Arunima, Arunima; Govind, Amith
Aims.Gaia delivers the positions and velocities of stars at an unprecedented precision. Therefore, for star clusters, there exists much higher confidence in whether a specific star is a member of a particular cluster or not. However, membership determination is still especially challenging for young star clusters. At ages 2−10 Myr, the gas is expe…
TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
Nagel, E.; Amado, P. J.; Caballero, J. A. +79 more
We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the alert that this was a TESS planet candidate with a period of 21.3 days went out in April 2020. However, ground-based follow-up observations, including seeing-limited phot…
Gaia Focused Product Release: Asteroid orbital solution. Properties and assessment
Prusti, T.; Mazeh, T.; Zucker, S. +403 more
Context. We report the exploitation of a sample of Solar System observations based on data from the third Gaia Data Release (Gaia DR3) of nearly 157 000 asteroids. It extends the epoch astrometric solution over the time coverage planned for the Gaia DR4, which is not expected before the end of 2025. This data set covers more than one full orbital …
Quiet-time suprathermal ions in the inner heliosphere during the rising phase of solar cycle 25
Wimmer-Schweingruber, R. F.; Allen, R. C.; Ho, G. C. +3 more
Context. The Solar Orbiter spacecraft made its first close perihelion passes in 2022, reaching 0.32 au on 26 March and 0.29 au on 12 October. Transient activity was relatively low, making it possible to perform measurements of the quiet-time suprathermal ion pool over multi-day periods.
Aims: The inner heliosphere suprathermal ion pool is a s…
Identifying preflare spectral features using explainable artificial intelligence
Kleint, Lucia; Panos, Brandon; Zbinden, Jonas
The prediction of solar flares is of practical and scientific interest; however, many machine learning methods used for this prediction task do not provide the physical explanations behind a model's performance. We made use of two recently developed explainable artificial intelligence techniques called gradient-weighted class activation mapping (G…