Search Publications
The magnetic field clock angle departure in the Venusian magnetosheath and its response to IMF rotation
Xu, Qi; Zhang, Tielong; Rong, Zhaojin +4 more
We investigate the characteristics of interplanetary magnetic field (IMF) draping in the Venusian magnetosheath using both Venus Express (VEX) observations and magnetohydrodynamics simulations. The distributions of magnetosheath field clock angle illustrate the nearly symmetric morphology of draped magnetic field with respect to the solar wind ele…
Search for Dormant Black Holes in the OGLE Data
Mróz, P.; Kapusta, M.
Light curves of ellipsoidal variables collected by the Optical Gravitational Lensing Experiment (OGLE) were analyzed, in order to search for dormant black hole candidates. After the preselection based on the amplitude of ellipsoidal modulation, each object was investigated by means of the spectral energy distribution fit, which allowed us to selec…
The first evidence of tidally induced activity in a brown dwarf-M dwarf pair: a Chandra study of the NLTT 41135/41136 system
Stelzer, Beate; Poppenhaeger, Katja; Wolk, Scott J. +3 more
The magnetic activity of low-mass stars changes as they age. The primary process decreasing the stellar activity level is the angular momentum loss via magnetized stellar wind. However, processes like tidal interactions between stars and their close companions may slow down the braking effect and the subsequent decrease of the activity level. Unti…
X-rays and TESS observations of symbiotic binary stars
Nuñez, N. E.; Mukai, K.; Sokoloski, J. L. +5 more
Symbiotic stars are strongly interacting binaries composed of a white dwarf accreting from its red giant companion. We studied five symbiotics stars: BD~Cam, V1261~Ori, NQ~Gem, CD~-27~8661, CD~-36~8436 using observations from the Swift/XRT and XMM-Newton satellites in X-rays and from TESS in the optical. The X-ray spectra were fit with absorbed op…
Insights into the interaction between defrosting seasonal ices and gully activity from CaSSIS and HiRISE observations in Sisyphi Cavi, Mars
Pajola, M.; Munaretto, G.; Vincendon, M. +10 more
Martian gullies are surface features, typically composed of an alcove, a channel and a depositional apron. They have been extensively studied since their first observations in the 2000s and were initially attributed to the action of liquid water. Later studies highlighted that their activity is spatially and temporally correlated with the seasonal…
Reaching Submillisecond Accuracy in Stellar Occultations and Artificial Satellite Tracking
Kamiński, K.; Marciniak, A.; Weber, C. +2 more
In recent years, there appeared a need for astronomical observations timed with submillisecond accuracy. These include, e.g., timing stellar occultations by small, subkilometer, or fast near-Earth asteroids and tracking artificial satellites in low-Earth orbit using optical sensors. Precise astrometry of fast-moving satellites and accurate timing …
Radio-optical Reference Catalog, Version 1
Secrest, Nathan J.; Makarov, Valeri V.; Johnson, Megan C.
The fundamental celestial reference frame (CRF) is based on two catalogs of astrometric positions: the third realization of the International Celestial Reference Frame (ICRF3), and the much larger Gaia CRF, built from the third data release (DR3). The objects in common between these two catalogs are mostly distant AGNs and quasars that are both su…
Cometary dust collected by MIDAS on board Rosetta. I. Dust particle catalog and statistics
Bentley, M. S.; Mannel, T.; Longobardo, A. +5 more
Context. The Micro-Imaging Dust Analysis System (MIDAS) atomic force microscope (AFM) on board the Rosetta comet orbiter has been dedicated to the collection and 3D topographical investigation of cometary dust in the size range of a few hundreds of nanometers to tens of micrometers with a resolution down to a few nanometers.
Aims: We aim to c…
OMEGA/Mars Express: A new martian atmospheric dust hunter
Vincendon, Mathieu; Leseigneur, Yann
While dust is a key parameter of Mars climate, its behaviour from one year to the next can appear erratic. This variability is notably related to Global Dust Storms (GDS) which occur only certain years with different onset, duration and intensity. The interannual variabilities of the dust cycle may notably explain some characteristics of Recurring…
Multi-spacecraft observations of near-relativistic electron events at different radial distances
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Gómez-Herrero, R. +11 more
Aims: We study the radial evolution of near-relativistic solar energetic electron (SEE) events observed by at least two spacecraft at different heliocentric distances and with small separation angles between their magnetic footpoints at the Sun.
Methods: We identified SEE events for which Solar Orbiter and either Wind or STEREO-A had a s…