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The HST Large Programme on NGC 6752. I. Serendipitous discovery of a dwarf Galaxy in background
Salaris, M.; Apai, D.; Anderson, J. +12 more
As part of a large Hubble Space Telescope investigation aiming at reaching the faintest stars in the Galactic globular cluster NGC 6752, an Advanced Camera for Surveys/Wide Field Channel field was the subject of deep optical observations reaching magnitudes as faint as V ∼ 30. In this field, we report the discovery of Bedin I, a dwarf spheroidal g…
Polarimetric Reconstruction of Coronal Mass Ejections from LASCO-C2 Observations
Lamy, Philippe; Floyd, Olivier
The three-dimensional morphology and direction of propagation of coronal mass ejections (CMEs) are essential information for identifying their source on the solar disk, for understanding the processes of their ejection and propagation in the corona, and for forecasting their possible impact with the Earth or any other objects in the solar system. …
High-velocity runaway binaries from supernovae in triple systems
Li, Jiao; Jia, Shi; Gao, Yan
Recent studies on hypervelocity stars (HVSs) have generated a need to understand the high velocity limits of binary systems. If runaway binary systems with high movement speeds well in excess of 200 km s-1 were to exist, it would have implications on how HVS candidates are selected, and our current understanding of how they form needs t…
SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b
Bouchy, F.; Deleuil, M.; Moutou, C. +15 more
Whereas thousands of transiting giant exoplanets are known today, only a few are well characterized with long orbital periods. Here we present KOI-3680b, a new planet in this category. First identified by the Kepler team as a promising candidate from the photometry of the Kepler spacecraft, we establish here its planetary nature from the radial ve…
An unusually large gaseous transit in a debris disc
Wahhaj, Zahed; Kennedy, Grant M.; Godoy, Nicolás +9 more
We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD 37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD 37306 stood out sho…
Quincuncial adaptive closed Kohonen (QuACK) map for the irregularly shaped comet 67P/Churyumov-Gerasimenko
Grieger, B.
Context. Standard global map projections cannot display the complete surface of a highly irregular body such as the Rosetta target comet 67P/Churyumov-Gerasimenko because different points on the surface can have the same longitude and latitude.
Aims: We present a concept of generalized longitudes and latitudes that allows us to display the co…
The case for a high-redshift origin of GRB 100205A
Cenko, S. B.; Lyman, J. D.; Berger, E. +15 more
The number of long gamma-ray bursts (GRBs) known to have occurred in the distant Universe (z > 5) is small (∼15); however, these events provide a powerful way of probing star formation at the onset of galaxy evolution. In this paper, we present the case for GRB 100205A being a largely overlooked high-redshift event. While initially noted as a h…
Electron acceleration at comet 67P/Churyumov-Gerasimenko
Nilsson, H.; Eriksson, A.; Goldstein, R. +6 more
We report the observation by the Ion and Electron Sensor (IES) of energetic (>1 keV) electrons in the plasma environment of comet 67P Churyumov-Gerasimenko (67P). Most of the electrons in the cometary coma are expected to be of solar wind, photoionization, or electron impact origin and are therefore not expected to exceed some hundreds of eV in…
Ultraviolet Mg II emission from fast neutral ejecta around Eta Carinae
Smith, Nathan; Morse, Jon A.
We present the first images of the nebula around η Carinae obtained with the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope (HST), including an ultraviolet (UV) image in the F280N filter that traces Mg II emission, plus contemporaneous imaging in the F336W, F658N, and F126N filters that trace near-UV continuum, [N II], and [Fe II], …
CIELO-RGS: a catalog of soft X-ray ionized emission lines
Grinberg, Victoria; Kretschmar, Peter; Guainazzi, Matteo +9 more
Context. High-resolution X-ray spectroscopy has advanced our understanding of the hot Universe by revealing physical properties like kinematics, temperature, and abundances of the astrophysical plasmas. Despite technical and scientific achievements, the lack of scientific products at a level higher than count spectra is hampering complete scientif…