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Photometric modelling and VIS-IR albedo maps of Rhea from Cassini-VIMS
Buratti, B. J.; Clark, R. N.; Stephan, K. +6 more
Photometric correction based on the Shkuratov method is applied to derive visible and infrared albedo maps of Rhea from disc-resolved Cassini VIMS data. Differently from I/F images, albedo maps offer an optimal disentanglement of composition and physical properties of the surface from illumination-viewing effects and to study spectral variations o…
Disc galaxy resolved in H I absorption against the radio lobe of 3C 433 : Case study for future surveys
Morganti, Raffaella; Oosterloo, Tom; Emonts, Bjorn +3 more
The neutral atomic gas content of galaxies is usually studied in the H I 21 cm emission line of hydrogen. However, as we go to higher redshifts, owing to the weak strength of the transition, we need very deep integrations to detect H I emission. The H I absorption does not suffer from this dependence on distance as long as there is a sufficiently …
Multiple black hole system in 4C31.61 (2201+315)
Taris, F.; Gattano, C.; Lambert, S. B. +1 more
Modeling trajectories of radio components ejected by the nucleus of 4C31.61 (2201+315) and observed by very long baseline interferometry (VLBI) in the frame of the MOJAVE survey suggests that they are ejected from three different origins that possibly host three different supermassive black holes. These origins correspond to three stationary compo…
Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
Bechtol, K.; Smith, M.; Abbott, T. M. C. +58 more
We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems were selected based on common distance criteria. About 90 per cent of the total sample has proper motions available and 73 per …
Searching for debris discs in the 30 Myr open cluster IC 4665
Miret-Roig, N.; Huélamo, N.; Bouy, H.
Context. Debris discs orbiting young stars are key to understanding dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe surveys to revisit the disc population of this cluster.
Aims: We aim to study the disc population of IC …
The stellar rotation-activity relation for a sample of SuperWASP and ASAS-SN field stars
Thiemann, Heidi B.; Norton, Andrew J.; Kolb, Ulrich C.
It is well established that late-type main-sequence (MS) stars display a relationship between X-ray activity and the Rossby number, Ro, the ratio of rotation period to the convective turnover time. This manifests itself as a saturated regime (where X-ray activity is constant) and an unsaturated regime (where X-ray activity anti-correlates with Ros…
Periodic brightening of Kepler light curves: investigating the possibility of forward scattering due to dust clouds
Kenworthy, M.; van Kooten, M. A. M.; Doelman, N.
Dedicated transiting surveys, such as the Kepler space telescope, have provided the astronomy community with a rich data set resulting in many new discoveries. In this paper, we look at eight Kepler objects identified by Wheeler & Kipping with a periodic, broad increase in flux, that look distinctly different from intrinsic star variability. W…
Spectral Modeling of Charge Exchange in the Central Region of M51
Zhang, Shuinai; Ji, Li; Yang, Hang
Charge exchange (CX) emission reveals the significant interaction between neutral and ionized interstellar medium components of the dense, multiphase, circumnuclear region of a galaxy. We use a model including a thermal and CX components to describe the high-resolution XMM-Newton/RGS spectrum of the diffuse emission in the central region of M51. R…
Submillimeter and Far-infrared Spectroscopy of Monodeuterated Amidogen Radical (NHD): Improved Rest Frequencies for Astrophysical Observations
Bizzocchi, Luca; Melosso, Mattia; Giuliano, Barbara Michela +6 more
Observations of ammonia in interstellar environments have revealed high levels of deuteration, and all its D-containing variants, including ND3, have been detected in cold prestellar cores and around young protostars. The observation of these deuterated isotopologues is very useful for elucidating the chemical and physical processes tak…
Sparse subsurface radar reflectors in Hellas Planitia, Mars
Goudge, Timothy A.; Byrne, Shane; Viola, Donna +5 more
Geomorphological features potentially related to subsurface ice, such as scalloped depressions, expanded craters, pedestal craters, and banded terrain, are present in and around Hellas Planitia, Mars. We present a radar survey of the region using the Shallow Radar (SHARAD) instrument on board the Mars Reconnaissance Orbiter (MRO) to identify candi…