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Astrometry of Cassini ISS Images of 7 Near-ring Inner Satellites of Saturn Affected by Scattered Light
Li, Y.; Li, Z.; Wang, Z. Q. +4 more
The Imaging Science Subsystem (ISS) mounted on Cassini spacecraft took images of Saturn's inner satellites between 2004 and 2017. In some of these images, the satellites are so close to Saturn rings that their images are affected by the scattered light from Saturn rings, which results in poor, even impossible, measurements of targets. A background…
Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems
Carballo-Bello, Julio A.; Gromadzki, Mariusz; Marocco, Federico +3 more
Disintegrating multiple systems have been previously discovered from kinematic studies of the Hipparcos catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disc between single/multiple systems. In this paper, we aim to expand the search for such systems, to study their properties, as well as to characteri…
Assessment of Morphology and Degradation of Craters in and Around Gale Crater, Mars Using High Resolution Stereo Camera (HRSC) Images
Shaheen, Farzana; Lala, Mili Ghosh Nee; Krishna, A. P.
Timing the X-ray pulsating companion of the hot subdwarf HD 49798 with NICER
Mereghetti, Sandro; Rigoselli, Michela; Malacaria, Christian +1 more
HD 49798 is a hot subdwarf of O spectral type in a 1.55 d orbit with the X-ray source RX J0648.0-4418, a compact object with a spin period of $13.2\,$s. We use recent data from the Neutron Star Interior Composition Explorer instrument, joined with archival data from XMM-Newton and ROSAT, to obtain a phase-connected timing solution spanning ~30 yr.…
Large-Scale Ejecta of Z CMa—Proper Motion Study and New Features Discovered
Liimets, Tiina; Kraus, Michaela; Cidale, Lydia +2 more
Z Canis Majoris is a fascinating early-type binary with a Herbig Be primary and a FU Orionis-type secondary. Both of the stars exhibit sub-arcsecond jet-like ejecta. In addition, the primary is associated with the extended jet as well as with the large-scale outflow. In this study, we investigate further the nature of the large-scale outflow, whic…
Wray 15-811: An unusual runaway star
Gamen, R.; Di Mille, F.; Gramajo, L. +4 more
We investigate Wray 15-811, a poorly studied object of controversial nature. We present for the first time spectroscopic observations (at low, medium, and high resolution), together with deep narrow-band images. These original data are combined with data from public surveys, to infer the nature of this object.
We conclude that Wray 15-811 is …Behaviour of molecular hydrogen emission in three solar flares
Fletcher, Lyndsay; Mulay, Sargam M.; Labrosse, Nicolas +1 more
We have systematically investigated ultraviolet (UV) emission from molecular hydrogen (H2) using the Interface Region Imaging Spectrograph (IRIS), during three X-ray flares of C5.1, C9.7, and X1.0 classes on 2014 October 25. Significant emission from five H2 spectral lines appeared in the flare ribbons, interpreted as photoex…
New variable sources revealed by DECam toward the LMC: The first 15 deg2
Nucita, A. A.; De Paolis, F.; Franco, A. +2 more
The Dark Energy Camera (DECam) is a sensitive, wide field instrument mounted at the prime focus of the 4 mV. Blanco Telescope in Chile. Beside its main objectives, i.e. understanding the growth and evolution of structures in the Universe, the camera offers the opportunity to observe a ∼ 3deg2 field of view in one single pointing and, wi…
Modelling gas around galaxy pairs and groups using the Q0107 quasar triplet
Tejos, Nicolas; Beckett, Alexander; Morris, Simon L. +3 more
We examine to what extent disc and outflow models can reproduce observations of H I gas within a few virial radii of galaxies in pairs and groups. Using highly sensitive HST/COS and FOS spectra of the Q0107 quasar triplet covering Ly α for z≲1, as well as a deep galaxy redshift survey including VIMOS, DEIMOS, GMOS, and MUSE data, we test simple di…
Understanding the radio emission from ϵ Eridani
Rodríguez, Luis F.; Lizano, Susana; Cantó, Jorge +1 more
Some solar-type stars are known to present faint, time-variable radio continuum emission whose nature is not clearly established. We report on Jansky Very Large Array observations of the nearby star ϵ Eridani at 10.0 and 33.0 GHz. We find that this star has flux density variations on scales down to days, hours, and minutes. On 2020 April 15 it exh…