Search Publications
Tracing the Galactic disk with planetary nebulae using Gaia DR3. Distance catalog, velocities, populations, and radial metallicity gradients of Galactic planetary nebulae
Bucciarelli, B.; Stanghellini, L.
Aims: We study the population of Galactic planetary nebulae (PNe) and their central stars (CSPNe) through the analysis of their distances and Galactic distribution. The PN distances are obtained by means of a revised statistical distance scale, based on an astrometrically-defined sample of their central stars from the third Gaia Data Release …
Electron density revealing the boundaries of Mercury's magnetosphere via serendipitous measurements by SORBET during BepiColombo first and second Mercury swing-bys
Pantellini, F.; Issautier, K.; Kasaba, Y. +3 more
Aims: We aim to establish the boundaries of Mercury's magnetosphere through a comparison of the drops and rises of the electron density revealed by PWI/SORBET, during BepiColombo's first and second swing-bys of Mercury carried out on 1 October 2021 and 23 June 2022, with global 3D magnetohydrodynamic simulations.
Methods: SORBET was swit…
The age, kinematics, and metallicity of nearby Sun-like stars and the history of the Milky Way disc
Gondoin, P.
Contact. Investigating how the Milky Way formed and has evolved is an important topic in astrophysics that requires the determination of precise ages for large samples of stars over long periods.
Aims: The present study addresses the formation history of nearby Sun-like stars using the emission reversal in the cores of their Ca II H&K Fra…
An advanced thermal roughness model for airless planetary bodies. Implications for global variations of lunar hydration and mineralogical mapping of Mercury with the MERTIS spectrometer
Hiesinger, Harald; Helbert, Jörn; Wöhler, Christian +1 more
We present a combined reflectance and thermal radiance model for airless planetary bodies. The Hapke model provides the reflected component. The developed thermal model is the first to consistently use rough fractal surfaces, self-scattering, self-heating, and disk-resolved bolometric albedo for entire planets. We validated the model with disk-res…
A LOFAR sample of luminous compact sources coincident with nearby dwarf galaxies
Shimwell, T. W.; Vedantham, H. K.; Kaplan, D. L. +5 more
The vast majority of extragalactic compact continuum radio sources are associated with star formation or jets from (super)massive black holes and, as such, are more likely to be found in association with starburst galaxies or early-type galaxies. Two new populations of radio sources were recently identified: (a) compact and persistent sources (PRS…
Interaction of a coronal mass ejection and a stream interaction region: A case study
Geyer, Paul; Dumbović, Mateja; Temmer, Manuela +3 more
We investigated the interaction of a coronal mass ejection (CME) and a coronal hole (CH) in its vicinity using remote-sensing and 1 AU in situ data. We used extreme-ultraviolet images and magnetograms to identify coronal structures and coronagraph images to analyze the early CME propagation. The Wind spacecraft and the Advanced Composition Explore…
Activity distribution of comet 67P/Churyumov-Gerasimenko from combined measurements of non-gravitational forces and torques
Jorda, L.; Agarwal, J.; Groussin, O. +5 more
Aims: Understanding the activity is vital for deciphering the structure, formation, and evolution of comets. We investigate models of cometary activity by comparing them to the dynamics of 67P/Churyumov-Gerasimenko.
Methods: We matched simple thermal models of water activity to the combined Rosetta datasets by fitting to the total outgas…
Beyond the disk: EUV coronagraphic observations of the Extreme Ultraviolet Imager on board Solar Orbiter
Zhang, X.; Schmutz, W.; Mierla, M. +38 more
Context. Most observations of the solar corona beyond 2 R⊙ consist of broadband visible light imagery carried out with coronagraphs. The associated diagnostics mainly consist of kinematics and derivations of the electron number density. While the measurement of the properties of emission lines can provide crucial additional diagnostics …
Deuterium fractionation across the infrared-dark cloud G034.77−00.55 interacting with the supernova remnant W44
Caselli, P.; Viti, S.; Jiménez-Serra, I. +10 more
Context. Supernova remnants (SNRs) may regulate star formation in galaxies. For example, SNR-driven shocks may form new molecular gas or compress pre-existing clouds and trigger the formation of new stars.
Aims: To test this scenario, we measured the deuteration of N2H+, DfracN2H+
The unusual planetary nebula nucleus in the Galactic open cluster M37 and six further hot white dwarf candidates
Rebassa-Mansergas, Alberto; Raddi, Roberto; Torres, Santiago +6 more
Planetary nebulae in Galactic open star clusters are rare objects; only three are known to date. They are of particular interest because their distance can be determined with high accuracy, allowing one to characterize the physical properties of the planetary nebula and its ionizing central star with high confidence. Here we present the first quan…