Search Publications
The 18-19 March 2022 series of 3He-rich events observed by Solar Orbiter at 0.36 au compared with EUV, X-ray, and radio observations
Maksimovic, M.; Vecchio, A.; Krucker, S. +10 more
Context. During the first close perihelion pass of Solar Orbiter, a series of impulsive 3He-rich solar particle events was observed on 18-19 March 2022 from a distance of 0.36 au. In addition to the energetic particle, radio, and X-ray data from Solar Orbiter, the events were observed in radio and/or extreme ultraviolet by STEREO-A, SDO…
First polar observations of the fast solar wind with the Metis - Solar Orbiter coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration
Heinzel, P.; Sasso, C.; Romoli, M. +33 more
Context. The fast solar wind is known to emanate from polar coronal holes.
Aims: This Letter reports the first estimate of the expansion rate of polar coronal flows performed by the Metis coronagraph on board Solar Orbiter.
Methods: By exploiting simultaneous measurements in polarized white light and ultraviolet intensity of the neutral …
The existence of hot X-ray onsets in solar flares
Krucker, Säm; Veronig, Astrid M.; Dickson, Ewan C. M. +9 more
Context. It is well known among the scientific community that solar flare activity often begins well before the main impulsive energy release. However, a consistent explanation for this phenomenon has not yet been established.
Aims: Our aim is to investigate the earliest phase of four distinct flares observed by Solar Orbiter/STIX and determi…
Multi-campaign asteroseismic analysis of eight solar-like pulsating stars observed by the K2 mission
García, R. A.; Pérez Hernández, F.; Mathur, S. +11 more
The NASA K2 mission that succeeded the nominal Kepler mission observed several hundred thousand stars during its operations. While most of the stars were observed in single campaigns of ∼80 days, some of them were targeted for more than one campaign. We perform an asteroseismic study of a sample of eight solar-like stars observed during K2 Campaig…
Occurrence rate of hot Jupiters orbiting red giant stars
Snellen, Ignas A. G.; Temmink, Milou
Context. Hot Jupiters form an enigmatic class of object whose formation pathways are not yet clear. Determining their occurrence rates as a function of orbit, planet and stellar mass, and system age can be an important ingredient for understanding how they form. To date, various hot Jupiters have been discovered orbiting red giant stars, and deriv…
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…