Search Publications
Does Turbulence along the Coronal Current Sheet Drive Ion Cyclotron Waves?
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +32 more
Evidence for the presence of ion cyclotron waves (ICWs), driven by turbulence, at the boundaries of the current sheet is reported in this paper. By exploiting the full potential of the joint observations performed by Parker Solar Probe and the Metis coronagraph on board Solar Orbiter, local measurements of the solar wind can be linked with the lar…
Accretion in the binary system GG Carinae and implications for B[e] supergiants
Kashi, Amit
We simulate the hydrodynamics of the wind flow in the B[e] supergiant binary system GG Carinae and obtain the mass accretion rate on to the secondary and the observed light curve. We find an inhomogeneous Bondi-Hoyle-Lyttleton accretion into a curved accretion tail, and confirm that the accretion rate is modulated along the orbit, with a maximum c…
Study of solar neighborhood open cluster NGC 6475 and 11 possible members B-type stars
Hendy, Y. H. M.; El-Depsey, M. H.; Shokry, Ahmed +2 more
In the present paper, we performed the optical, astrometric and spectroscopic studies for the open star cluster NGC 6475 using Gaia DR3 data. Using the radial density profile, we estimated the radius of the cluster to be equal to 1.44°. It is located at a distance of 279 ± 17 pc and has a service life of 224 ± 26 Myr. The mean proper motions in RA…
Astrometric Reduction of Saturnian Satellites with Cassini-ISS Images Degraded by Trailed Stars
Li, Yan; Zhang, Qing-Feng; Liu, Meng-Qi +4 more
The Imaging Science Subsystem (ISS) mounted on the Cassini spacecraft has taken a lot of images, which provides an important source of high-precision astrometry of some planets and satellites. However, some of these images are degraded by trailed stars. Previously, these degraded images cannot be used for astrometry. In this paper, a new method is…
Space weather-related activities and projects on-going at INAF-Turin Observatory
Telloni, Daniele; Susino, Roberto; Fineschi, Silvano +18 more
The Solar Physics Group at the INAF-Turin Astrophysical Observatory (OATo) is actually involved in different Space Weather (SW) projects and missions. In particular, this Group is currently providing for the ESA SWESNET portal two new data analysis tools aimed at (1) the automated identification of magnetic flux ropes from the in situ data (CME ma…
The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association
Pinte, C.; Ménard, F.; Augereau, J. -C. +17 more
Context. Circumstellar debris disks provide insight into the formation and early evolution of planetary systems. Resolved belts in particular help to locate planetesimals in exosystems, and can hint at the presence of disk-sculpting exoplanets.
Aims: We study the circumstellar environment of HD 112810 (HIP 63439), a mid-F-type star in the Sco…
The Geology of Eden Patera, a Type-Example of Plains Style Caldera Complexes on Mars
Michalski, Joseph R.; Chu, Yin Yau Yoyo; Webb, A. Alexander G.
A population of underrecognized volcanic constructs associated with explosive and effusive volcanism is present within Arabia Terra and perhaps throughout the ancient highlands on Mars. These features, termed "plains-style caldera complexes," are characterized by 10s-of-km wide crustal collapse structures, lava flows, and potential pyroclastic dep…
Multi-instrument analysis of 67P/Churyumov-Gerasimenko coma particles: COPS-GIADA data fusion
Altwegg, K.; Rubin, M.; Hänni, N. +6 more
Context. The European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko has offered scientists the opportunity to study a comet in unprecedented detail. Four instruments of the Rosetta orbiter, namely, the Micro-Imaging Dust Analysis System (MIDAS), the Grain Impact Analyzer and Dust Accumulator (GIADA), the COmetary Secondary Ion …
The complex shape of the outer edge of Saturn's B ring, as observed in Cassini occultation data
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +9 more
We determine the time-variable shape of the outer edge of Saturn's B ring using the complete set of Cassini radio and stellar occultation data obtained between mid-2005 and the End-of-Mission in late 2017, considerably expanding the range and number of individual ring edge measurements used in previous analyses (Spitale and Porco, 2010; Nicholson …
New Insights on 30 Dor B Revealed by High-quality Multiwavelength Observations
Liu, Sheng-Yuan; Chu, You-Hua; Ueda, Shutaro +4 more
The supernova remnant (SNR) 30 Dor B is associated with the H II region ionized by the OB association LH99. The complex interstellar environment has made it difficult to study the physical structure of this SNR. We have used Hubble Space Telescope Hα images to identify SNR shocks and deep Chandra X-ray observations to detect faint diffuse emission…