Search Publications
Study of the excess Fe XXV line emission in the central degrees of the Galactic centre using XMM-Newton data
Campana, S.; Haberl, F.; Ponti, G. +14 more
The diffuse Fe XXV (6.7 keV) line emission observed in the Galactic ridge is widely accepted to be produced by a superposition of a large number of unresolved X-ray point sources. In the very central degrees of our Galaxy, however, the existence of an extremely hot (~7 keV) diffuse plasma is still under debate. In this work we measure the Fe XXV l…
The molecular environment of the solar-type protostar IRAS 16293-2422
Wyrowski, Friedrich; Menten, Karl M.; Kahle, K. Angelique +1 more
Context. Studying the physical and chemical processes leading to the formation of low-mass stars is crucial for understanding the origin of our Sun and the Solar System. In particular, analyzing the emission and absorption lines from molecules to derive their spatial distribution in the envelopes of young stellar objects is a fundamental tool to o…
Stellar spectral-type (mass) dependence of the dearth of close-in planets around fast-rotating stars. Architecture of Kepler confirmed single-exoplanet systems compared to star-planet evolution models
García, R. A.; Mathis, S.; Mathur, S. +8 more
In 2013 a dearth of close-in planets around fast-rotating host stars was found using statistical tests on Kepler data. The addition of more Kepler and Transiting Exoplanet Survey Satellite (TESS) systems in 2022 filled this region of the diagram of stellar rotation period (Prot) versus the planet orbital period (Porb). We rev…
Oort Cloud comets discovered far from the Sun
Dones, Luke; Królikowska, Małgorzata
Context. Increasingly, Oort Cloud comets are being discovered at great distances from the Sun and tracked over ever wider ranges of heliocentric distances as observational equipment improves.
Aims: Our goal is to investigate in detail how the original semimajor axis for near-parabolic comets depends on the selected data arc and the assumed fo…
SRG/eROSITA and XMM-Newton observations of Vela Jr
Sasaki, Manami; Becker, Werner; Freyberg, Michael +4 more
Context. The Vela supernova remnant (SNR) complex is a region containing at least three SNRs: Vela, Puppis A, and Vela Jr. With the launch of the spectro-imaging X-ray telescope eROSITA on board the Spectrum-Röntgen-Gamma (SRG) mission, it became possible to observe the one degree wide Vela Jr in its entirety. Although several previous pointed Cha…
Gaia search for early-formed andesitic asteroidal crusts
Galluccio, L.; Delbo, M.; Avdellidou, C. +2 more
Context. Andesitic meteorites are among the oldest achondrites known to date. They record volcanic events and crust formation episodes in primordial planetesimals that took place about 4.565 Myr ago. However, no analogue for these meteorites has been found in the asteroid population to date.
Aims: We searched for spectroscopic analogues of th…
Galactic population synthesis of radioactive nucleosynthesis ejecta
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +3 more
Diffuse γ-ray line emission traces freshly produced radioisotopes in the interstellar gas, providing a unique perspective on the entire Galactic cycle of matter from nucleosynthesis in massive stars to their ejection and mixing in the interstellar medium (ISM). We aim to construct a model of nucleosynthesis ejecta on a galactic scale that is speci…
Binary star population of the Sculptor dwarf galaxy
McConnachie, Alan W.; Tolstoy, Eline; Irwin, Michael J. +3 more
Aims: We aim to compute the binary fraction of "classical" dwarf spheroidal galaxies (dSphs) that are satellites of the Milky Way (MW). This value can offer insights into the binary fraction in environments that are less dense and more metal-poor than our own galaxy. Additionally, knowledge of the binary fraction in dwarf galaxies is importan…
Asteroids seen by JWST-MIRI: Radiometric size, distance, and orbit constraints
Müller, T. G.; Micheli, M.; Bartczak, P. +3 more
Infrared measurements of asteroids are crucial for the determination of physical and thermal properties of individual objects, and for understanding the small-body populations in the solar system as a whole. However, standard radiometric methods can only be applied if the orbit of an object is known, hence its position at the time of the observati…
Refining the properties of the TOI-178 system with CHEOPS and TESS
Alonso, R.; Deleuil, M.; Erikson, A. +84 more
Context. The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with radii ranging from ~1.1 to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All planets but the innermost one form a chain of Laplace resonances. Mass estimates derived from a preliminary radial vel…