Search Publications
A dynamical mass for GJ 463 b: A massive super-Jupiter companion beyond the snow line of a nearby M dwarf
Sozzetti, A.
We determined the full orbital architecture and true mass of the recently Doppler-detected long-period giant planet GJ 463 b using the HIPPARCOS-Gaia proper motion anomaly in combination with the available radial velocities, constraints from the knowledge of the spectroscopic orbital parameters, and supplementary information from a sensitivity ana…
Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c
Crowther, P. A.; Bostroem, K. A.; Sander, A. A. C. +5 more
Context. The upper stellar mass limit is a fundamental parameter for simulations of star formation, galactic chemical evolution, and stellar feedback. An empirical bound on this parameter is therefore highly valuable. The most massive stars known to date are R 136 a1, a2, a3, and c, with reported masses in excess of 150-200 M⊙ and initi…
Clustering of magnetic reconnection exhausts in the solar wind: An automated detection study
Rouillard, Alexis P.; Phan, Tai D.; Louarn, Philippe +9 more
Context. Magnetic reconnection is a fundamental process in astrophysical plasmas that enables the dissipation of magnetic energy at kinetic scales. Detecting this process in situ is therefore key to furthering our understanding of energy conversion in space plasmas. However, reconnection jets typically scale from seconds to minutes in situ, and as…
Apocenter pileup and arcs: A narrow dust ring around HD 129590
Bayo, A.; Henning, Th.; Milli, J. +6 more
Context. Observations of debris disks have significantly improved over the past decades, both in terms of sensitivity and spatial resolution. At near-infrared wavelengths, new observing strategies and post-processing algorithms allow us to drastically improve the final images and reveal faint structures in the disks. These structures inform us abo…
BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
Henning, Thomas; Reffert, Sabine; Viswanath, Gayathri +15 more
Recent observations by the B-star Exoplanet Abundance Study (BEAST) illustrate the existence of substellar companions around very massive stars. Here, we present the detection of two lower mass companions to a relatively nearby (148.7−1.3+1.5 pc), young (17−4+3 Myr), bright (V = 6.632 ± 0.006 mag), 2.58 …
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…