Search Publications
Improved source classification and performance analysis using Gaia DR3
Bailer-Jones, Coryn A. L.; Jamal, Sara
The Discrete Source Classifier (DSC) provides probabilistic classification of sources in Gaia Data Release 3 (GDR3) using a Bayesian framework and a global prior. The DSC Combmod classifier in GDR3 achieved for the extragalactic classes (quasars and galaxies) a high completeness of 92%, but a low purity of 22% (all sky, all magnitudes) due to cont…
Variable circularly polarized radio emission from the young stellar object [BHB2007]-1: Another ingredient of a unique system
Viganò, Daniele; Cleeves, L. Ilsedore; Zurlo, Alice +7 more
The young stellar object [BHB2007]-1 has been extensively studied in the past at radio, millimeter, and infrared wavelengths. It has revealed a gap in the disk and previous observations have claimed possible emission from a sub-stellar object undergoing formation, in correspondence to the disk gap. In this work, we analyzed a set of eight Karl G. …
Stratospheric aerosols and C6H6 in Jupiter's south polar region from JWST/MIRI observations
de Pater, Imke; Fletcher, Leigh N.; Vinatier, Sandrine +14 more
Context. The polar atmosphere of Jupiter is significantly affected by auroral activity, which can induce both thermal and chemical differences compared to the rest of the atmosphere. In particular, auroral activity enhances the production of various hydrocarbons, including benzene. Benzene could be a potential precursor to the formation of the str…
Modeling the Enceladus dust plume based on in situ measurements performed with the Cassini Cosmic Dust Analyzer
Kempf, S.; Postberg, F.; Srama, R. +5 more
We analyzed data recorded by the Cosmic Dust Analyzer on board the Cassini spacecraft during Enceladus dust plume traversals. Our focus was on profiles of relative abundances of grains of different compositional types derived from mass spectra recorded with the Dust Analyzer subsystem during the Cassini flybys E5 and E17. The E5 profile, correspon…
First Solar Orbiter observation of a dark halo in the solar atmosphere
Parenti, S.; Long, D. M.; Andretta, V. +5 more
Context. Solar active regions (ARs) are often surrounded by dark large areas of reduced emission compared to the quiet Sun, observed at various wavelengths corresponding to the chromosphere, transition region (TR), and corona, known as dark halos (DHs). The mechanisms behind the darker emission of DHs remain unclear and merit a wider scope of stud…
ExoplANETS-A: A virtual observatory database for host stars and planetary systems. The effect of XUV on planet atmospheres
Huélamo, N.; García, R. A.; Solano, E. +12 more
Context. ExoplANETS-A is an EU Horizon-2020 project with the primary objective of establishing new knowledge on exoplanet atmospheres. Intimately related to this topic is the study of the host stars' radiative properties in order to understand the environment in which exoplanets lie.
Aims: The aim of this work is to exploit archived data from…
Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei: II. Mrk 463E
Lopez-Rodriguez, E.; Marin, F.; Barnouin, T.
Context. The Mrk 463 system is known to host two powerful sources that are separated by about 4 kpc, which were both identified as active galactic nuclei (AGN). This makes the Mrk 463 system a unique laboratory for studying the geometry and dynamics of galaxy merging and its relation to AGN duty cycles. Aims. The eastern nucleus, Mrk 463E, is the …
Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs (Corrigendum)
Thévenin, Frédéric; Kervella, Pierre; Arenou, Frédéric
The evolution of lithium in FGK dwarf stars. Influence of planets and Galactic migration
Alfaro, E. J.; Cifuentes, C.; Cruz, P. +4 more
This work aims to investigate the behaviour of the lithium abundance in stars with and without detected planets. Our study is based on a sample of 1332 FGK main-sequence stars with measured lithium abundances, for 257 of which planets were detected. Our method reviews the sample statistics and is addressed specifically to the influence of tides an…
Formation of a streamer blob via the merger of multiple plasma clumps below 2 R⊙
Fu, Hui; Xia, Lidong; Huang, Zhenghua +7 more
Context. Propagating streamer blobs could be an important source of disturbances in the solar wind. Direct observations of the formation of streamer blobs could be a proxy for understanding the formation of small-scale structures and disturbances in the solar wind.
Aims: We aim to investigate how a streamer blob is formed before it is observe…