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Detection of Rotational Acceleration of Bennu Using HST Light Curve Observations
Emery, J. P.; Chesley, S. R.; Noll, K. S. +7 more
We observed the near-Earth asteroid (101955) Bennu from the ground in 1999 and 2005, and with the Hubble Space Telescope (HST) in 2012, to constrain its rotation rate. The data reveal an acceleration of 2.64 ± 1.05 × 10-6 deg/day2, which could be due to a change in the moment of inertia of Bennu or to spin up from the Yarkovs…
Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types
Bechtol, K.; Smith, M.; Abbott, T. M. C. +46 more
In this paper we present a catalogue of 11 745 brown dwarfs with spectral types ranging from L0 to T9, photometrically classified using data from the Dark Energy Survey (DES) year 3 release matched to the Vista Hemisphere Survey (VHS) DR3 and Wide-field Infrared Survey Explorer (WISE) data, covering ≈2400 deg2 up to iAB = 22.…
The Martian Bow Shock Over Solar Cycle 23-24 as Observed by the Mars Express Mission
Holmström, M.; Wild, J. A.; Lester, M. +2 more
The Martian bow shock position is known to be correlated with solar extreme ultraviolet irradiance. Since this parameter is also correlated with the evolution of the solar cycle, it is expected that the Martian bow shock position should also vary over such a period. However, previous reports on this topic have often proved contradictory. Using 13 …
Clues on the Origin and Evolution of Massive Contact Binaries: Atmosphere Analysis of VFTS 352
Sana, Hugues; Tramper, Frank; Justham, Stephen +10 more
The massive O4.5 V + O5.5 V binary VFTS 352 in the Tarantula Nebula is one of the shortest-period and most massive overcontact binaries known. Recent theoretical studies indicate that some of these systems could ultimately lead to the formation of gravitational waves via black hole binary mergers through the chemically homogeneous evolution pathwa…
Strong lensing reveals jets in a sub-microJy radio-quiet quasar
Jackson, N.; Sluse, D.; Stacey, H. R. +2 more
We present e-MERLIN and European VLBI Network observations which reveal unambiguous jet activity within radio-quiet quasar HS 0810+2554. With an intrinsic flux density of 880 nJy, this is the faintest radio source ever imaged. The findings present new evidence against the idea that radio-loud and radio-quiet quasars are powered by different underl…
The haloes and environments of nearby galaxies (HERON) - I. Imaging, sample characteristics, and envelope diameters
Sales, Laura; Kormendy, John; Rich, R. Michael +16 more
We use a dedicated 0.7-m telescope to image the haloes of 119 galaxies in the Local Volume to µr ∼ 28-30 mag arcsec-2. The sample is primarily from the Two Micron All Sky Survey Large Galaxy Atlas (Jarrett et al. 2003) and extended to include nearby dwarf galaxies and more distant giant ellipticals, and spans fully the …
Extended stellar systems in the solar neighborhood. III. Like ships in the night: the Coma Berenices neighbor moving group
Meingast, Stefan; Alves, João; Fürnkranz, Verena
We report the discovery of a kinematically cold group of stars, located in the immediate neighborhood of the well-known star cluster Coma Berenices (Mel 111). The new group identified in tangential velocity space as measured by Gaia contains at least 177 coeval members distributed in two subgroups, and appears as a flattened structure parallel to …
The VISCACHA survey - I. Overview and first results
Piatti, Andrés E.; Barbuy, Beatriz; Bica, Eduardo +15 more
The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA) Survey is an ongoing project based on deep photometric observations of Magellanic Cloud star clusters, collected using the SOuthern Astrophysical Research (SOAR) telescope together with the SOAR Adaptive Module Imager. Since 2015 more than 200 h of telescope time were …
Evidence for an emerging disc wind and collimated outflow during an X-ray flare in the narrow-line Seyfert 1 galaxy Mrk 335
Kriss, G. A.; Fabian, A. C.; Pinto, C. +13 more
A triggered 140{ ks}XMM-Newton observation of the narrow-line Seyfert 1 (NLS1) Mrk 335 in 2015 December caught the active galaxy at its lowest X-ray flux since 2007. The NLS1 is relatively quiescent for the first {∼ }120{ ks} of the observation before it flares in brightness by a factor of about five in the last 20{ ks}. Although only part of the …
Stellar activity analysis of Barnard's Star: very slow rotation and evidence for long-term activity cycle
Rebolo, R.; Amado, P. J.; Caballero, J. A. +58 more
The search for Earth-like planets around late-type stars using ultrastable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signals that can be misinterpreted as planetary signals. Among the nearby stars, we have selected Barnard's S…