Search Publications
Scale-Dependent Kurtosis of Magnetic Field Fluctuations in the Solar Wind: A Multi-Scale Study With Cluster 2003-2015
Alexandrova, O.; Lion, S.; Nakamura, R. +9 more
During the lifetime of the Cluster mission, the inter-spacecraft distances in the solar wind have changed from the large, fluid, scales (∼104 km), down to the scales of protons (∼102 km). As part of the guest investigator campaign, the mission achieved a formation where a pair of spacecraft were separated by ∼7 km. The small …
The High-ionization IR Fine Structure Lines as Bolometric Indicators of the AGN Power: Study of the Complete 12 µm AGN Sample
Spinoglio, Luigi; Fernández-Ontiveros, Juan Antonio; Malkan, Matthew A.
The high-ionization mid-IR lines, excited in the narrow-line regions of active galactic nuclei (AGN), barely affected by stellar excitation and dust extinction, trace the AGN bolometric power. We used the complete 12 µm sample of Seyfert galaxies, for which 100/116 objects have reliable 2-10 keV observations. The [Ne V] and [O IV] mid-IR lin…
The Distance and Dynamical History of the Virgo Cluster Ultradiffuse Galaxy VCC 615
Côté, Patrick; Peng, Eric W.; Ferrarese, Laura +6 more
We use deep Hubble Space Telescope imaging to derive a distance to the Virgo Cluster ultradiffuse galaxy (UDG) VCC 615 using the tip of the red giant branch (TRGB) distance estimator. We detect 5023 stars within the galaxy, down to a 50% completeness limit of F814W ≈ 28.0, using counts in the surrounding field to correct for contamination due to b…
The GAPS Programme at TNG. XXXVI. Measurement of the Rossiter-McLaughlin effect and revising the physical and orbital parameters of the HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29 eccentric planetary systems
Pagano, I.; Poretti, E.; Henning, Th. +34 more
Context. The measurement of the spin-orbit alignment of hot Jupiters, including a range of orbital and physical properties, can provide information about the evolution of the orbits of this special class of giant planets.
Aims: We aim to refine the orbital and physical parameters and determine the sky-projected planet orbital obliquity λ of f…
Enhancement of double-close-binary quadruples
Zakamska, Nadia L.; Hwang, Hsiang-Chih; Fezenko, Gavin B.
Double-close-binary quadruples (2 + 2 systems) are hierarchical systems of four stars where two short-period binary systems move around their common centre of mass on a wider orbit. Using Gaia Early Data Release 3, we search for comoving pairs where both components are eclipsing binaries. We present eight 2 + 2 quadruple systems with inner orbital…
Probabilistic model for dynamic galaxy decomposition
Mandelbaum, Rachel; Rau, Markus Michael; Jagvaral, Yesukhei +1 more
In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, …
HST UV Spectroscopy of the Planet-hosting T Tauri Star PDS 70
Skinner, Stephen L.; Audard, Marc
We summarize Hubble Space Telescope (HST) UV observations of the weak-lined T Tauri star (wTTS) PDS 70 obtained with the Space Telescope Imaging Spectrograph. These observations provide the first far-UV (FUV) and near-UV (NUV) spectra of PDS 70. Ground-based observations have so far revealed two formative giant planets orbiting in a wide gap in it…
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov-Gerasimenko
Da Deppo, Vania; Lellouch, Emmanuel; Buratti, Bonnie J. +24 more
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov-Gerasimenko. This shallow pit is one of several that later formed elsewhere on the comet, all in smooth terrain that primarily …
Investigation of the negative ionospheric response of the 8 September 2017 geomagnetic storm over the European sector
Oikonomou, Christina; Haralambous, Haris; Paul, Ashik +4 more
In this study, we investigate the negative ionospheric response over the European sector during two storms that took place on 8 September 2017, primarily, by exploiting observations over ten European locations. The spatial and temporal variations of TEC, foF2 and hmF2 ionospheric characteristics are examined with the aim to explain the physical me…
Gaia search for stellar companions of TESS Objects of Interest III
Mugrauer, Markus; Michel, Kai-Uwe; Zander, Jule
The latest results from our ongoing multiplicity study of (Community) TESS Objects of Interest are presented, using astro- and photometric data from the ESA-Gaia mission, to detect stellar companions of these stars and characterize their properties. A total of 124 binary and 7 hierarchical triple star systems were detected among 2175 targets, whos…