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Accretion in the recurrent nova T CrB: Linking the superactive state to the predicted outburst
Zamanov, R.; Marchev, D.; Semkov, E. +6 more
Context. T CrB (NOVA CrB 1946) is a famous recurrent nova with a recurrence timescale of 80 years.
Aims: We aim to estimate the colours, luminosity, and mass-accretion rate for T CrB (NOVA CrB 1946) during and after the superactive state.
Methods: We performed and analysed UBV photometry of the recurrent nova T CrB.
Results: For the…
Correlations between space weather parameters during intense geomagnetic storms: Analytical study
Miteva, Rositsa; Samwel, Susan
We explore the correlation between different parameters of space weather events associated with intense geomagnetic disturbances that occurred during the solar cycles (SCs) 23 and 24 (1996-2019). The space weather events under this study are the Solar Flares (SFs), Coronal Mass Ejections (CMEs), Geomagnetic Storms (GSs), Solar Energetic Protons (S…
The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105
Gaspari, M.; Combes, F.; O'Dea, C. P. +14 more
We present a case study of HE 0040-1105, an unobscured radio-quiet active galactic nucleus (AGN) at a high accretion rate of λ Edd = 0.19 ± 0.04. This particular AGN hosts an ionized gas outflow with the largest spatial offset from its nucleus compared to all other AGNs in the Close AGN Reference Survey. By combining multiwavelength obs…
Direct assessment of SDO/HMI helioseismology of active regions on the Sun's far side using SO/PHI magnetograms
Schmidt, W.; Woch, J.; Solanki, S. K. +47 more
Context. Earth-side observations of solar p modes can be used to image and monitor magnetic activity on the Sun's far side. In this work, we use magnetograms of the far side obtained by the Polarimetric and Helioseismic Imager (PHI) on board Solar Orbiter (SO) to directly assess the validity of far-side helioseismic holography for the first time. …
No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars
Pascucci, Ilaria; Christiansen, Jessie L.; Mulders, Gijs D. +3 more
Reliable detections of Earth-sized planets in the habitable zone remain elusive in the Kepler sample, even for M dwarfs. The Kepler sample was once thought to contain a considerable number of M-dwarf stars (T eff < 4000 K), which hosted enough Earth-sized ([0.5, 1.5] R ⊕) planets to estimate their occurrence rate (η ⊕…
Properties of Flapping Current Sheet of the Martian Magnetotail
Rong, Zhaojin; Shen, Chao; Wei, Yong +5 more
Knowing the properties of the Martian magnetotail flapping waves is critical to understand the dynamics of the Martian induced magnetosphere. Based on the measurements by Mars Atmosphere and Volatile EvolutioN and a newly developed method, we provide the first quantitative study of Martian magnetotail flapping waves in comparison with Earth's magn…
Photochemical depletion of heavy CO isotopes in the Martian atmosphere
Montmessin, Franck; Belyaev, Denis A.; Fedorova, Anna A. +12 more
The atmosphere of Mars is enriched in heavy isotopes with respect to Earth as a result of the escape of the atmosphere to space over billions of years. Estimating this enrichment requires a rigorous understanding of all atmospheric processes that contribute to the evolution of isotopic ratios between the lower and upper atmosphere, where escape pr…
Interplanetary scintillation (IPS) analyses during LOFAR campaign mode periods that include the first three Parker Solar Probe close passes of the Sun
Barnes, D.; Jackson, B. V.; Buffington, A. +9 more
The University of California, San Diego (UCSD) time-dependent three-dimensional (3-D) reconstruction technique provides volumetric maps of density, velocity, and solar surface extrapolated magnetic fields by iteratively fitting our kinematic 3-D model to interplanetary scintillation (IPS) observations. While we currently use data from the Institut…
Ganymede's atmosphere as constrained by HST/STIS observations
Leblanc, F.; Galand, M.; Roth, L. +7 more
A new analysis of aurora observations of Ganymede's atmosphere on the orbital leading and trailing hemispheres has been recently published by Roth et al. (2021), suggesting that water is its main constituent near noon. Here, we present two additional aurora observations of Ganymede's sub-Jovian and anti-Jovian hemispheres, which suggest a modulati…
Coma composition of comet 67P/Churyumov-Gerasimenko from radio-wave spectroscopy
Crovisier, J.; Biver, N.; Bockelée-Morvan, D. +11 more
We present the results of a molecular survey of comet 67P/Churyumov-Gerasimenko undertaken with the Institut de RadioAstronomie Millimétrique (IRAM) 30-m radio telescope in November-December 2021, when it had its most favourable apparition in decades. Observations at IRAM 30-m during the 12-16 November period covered 8 GHz bandwidth at 3 mm, 16 GH…