Search Publications
Three-dimensional turbulence-resolving modeling of the Venusian cloud layer and induced gravity waves
Lebonnois, Sébastien; Spiga, Aymeric; Lefèvre, Maxence
The impact of the cloud convective layer of the atmosphere of Venus on the global circulation remains unclear. The recent observations of gravity waves at the top of the cloud by the Venus Express mission provided some answers. These waves are not resolved at the scale of global circulation models (GCM); therefore, we developed an unprecedented 3-…
MOCCA-SURVEY Database I: Is NGC 6535 a dark star cluster harbouring an IMBH?
Kamann, Sebastian; Bianchini, Paolo; Askar, Abbas +3 more
We describe the dynamical evolution of a unique type of dark star cluster model in which the majority of the cluster mass at Hubble time is dominated by an intermediate-mass black hole (IMBH). We analysed results from about 2000 star cluster models (Survey Database I) simulated using the Monte Carlo code MOnte Carlo Cluster simulAtor and identifie…
Geology and mineralogy of the Auki Crater, Tyrrhena Terra, Mars: A possible post impact-induced hydrothermal system
Bellucci, G.; Carrozzo, F. G.; Altieri, F. +2 more
A variety of hydrothermal environments have been documented in terrestrial impact structures. Due to both past water interactions and meteoritic bombardment on the surface of Mars, several authors have predicted various scenarios that include the formation of hydrothermal systems. Geological and mineralogical evidence of past hydrothermal activity…
Using the Coronal Evolution to Successfully Forward Model CMEs' In Situ Magnetic Profiles
Gopalswamy, N.; Kay, C.
Predicting the effects of a coronal mass ejection (CME) impact requires knowing if impact will occur, which part of the CME impacts, and its magnetic properties. We explore the relation between CME deflections and rotations, which change the position and orientation of a CME, and the resulting magnetic profiles at 1 AU. For 45 STEREO-era, Earth-im…
Reconnection-driven Magnetohydrodynamic Turbulence in a Simulated Coronal-hole Jet
DeVore, C. Richard; Karpen, Judith T.; Uritsky, Vadim M. +1 more
Extreme-ultraviolet and X-ray jets occur frequently in magnetically open coronal holes on the Sun, especially at high solar latitudes. Some of these jets are observed by white-light coronagraphs as they propagate through the outer corona toward the inner heliosphere, and it has been proposed that they give rise to microstreams and torsional Alfvén…
First observations of W Virginis stars with K2: detection of period doubling
Smolec, R.; Szabados, L.; Pál, A. +5 more
We present the first analysis of W Vir stars observed by the Kepler space telescope in the K2 mission. Clear cycle-to-cycle variations were detected in the light curves of KT Sco and the globular cluster member M80-V1. While the variations in the former star seem to be irregular on the short time-scale of the K2 data, the latter appears to experie…
Height-dependent Velocity Structure of Photospheric Convection in Granules and Intergranular Lanes with Hinode/SOT
Shimizu, T.; Oba, T.; Iida, Y.
The solar photosphere is the visible surface of the Sun, where many bright granules, surrounded by narrow dark intergranular lanes, are observed everywhere. The granular pattern is a manifestation of convective motion at the photospheric level, but its velocity structure in the height direction is poorly understood observationally. Applying bisect…
The First Data Release of the Beijing-Arizona Sky Survey
Fan, Xiaohui; Jiang, Linhua; Cai, Zheng +25 more
The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging survey in the northern Galactic cap using the 2.3 m Bok telescope. The survey will cover about 5400 deg2 in the g and r bands, and the expected 5σ depths (corrected for the Galactic extinction) in these two bands are g = 24.0 and r = 23.4 mag (AB magnitude). BASS s…
The SCUBA-2 850 µm Follow-up of WISE-selected, Luminous Dust-obscured Quasars
Knudsen, Kirsten K.; Fan, Lulu; Han, Yunkun +1 more
Hot dust-obscured galaxies (Hot DOGs) are a new population recently discovered in the Wide-field Infrared Survey Explorer All-Sky survey. Multiwavelength follow-up observations suggest that they are luminous, dust-obscured quasars at high redshift. Here we present the JCMT SCUBA-2 850 µm follow-up observations of 10 Hot DOGs. Four out of ten…
Quasar spectral variability from the XMM-Newton serendipitous source catalogue
Middei, R.; Vagnetti, F.; Serafinelli, R.
Context. X-ray spectral variability analyses of active galactic nuclei (AGN) with moderate luminosities and redshifts typically show a "softer when brighter" behaviour. Such a trend has rarely been investigated for high-luminosity AGNs (Lbol ≳ 1044 erg/s), nor for a wider redshift range (e.g. 0 ≲ z ≲ 5).
Aims: We present…