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A dusty benchmark brown dwarf near the ice line of HD 72946
Absil, O.; Henning, T.; Brandner, W. +12 more
Context. HD 72946 is a bright and nearby solar-type star hosting a low-mass companion at long period (P ∼ 16 yr) detected with the radial velocity (RV) method. The companion has a minimum mass of 60.4 ± 2.2 MJ and might be a brown dwarf. Its expected semi-major axis of ∼243 mas makes it a suitable target for further characterization wit…
Sixteen Open Clusters Discovered with Sample-based Clustering Search of Gaia DR2
Xu, Ye; Hao, ChaoJie; Wu, ZhenYu +2 more
Accurate astrometric parameters and photometric data in three bands for more than 1.3 billion sources (mainly stars) were made available in the recent Gaia Data Release 2, allowing us to find new open clusters in the milky Way. We propose a novel sample-based clustering search method with high spatial resolution to search for open clusters (OCs). …
Average cometary ion flow pattern in the vicinity of comet 67P from moment data
Nilsson, Hans; Behar, Etienne; Goetz, Charlotte +7 more
Average flow patterns of ions around comet 67P detected by the RPC-ICA instrument onboard Rosetta are presented both as a time series and as a spatial distribution of the average flow in the plane perpendicular to the comet - Sun direction (Y-Z plane in the coordinate systems used). Cometary ions in the energy range up to 60 eV flow radially away …
A broad-band look of the accreting millisecond X-ray pulsar SAX J1748.9-2021 using AstroSat and XMM-Newton
Beri, Aru; Sanna, Andrea; Dutta, Anjan +1 more
SAX J1748.9-2021 is a transient accretion powered millisecond X-ray pulsar located in the globular cluster NGC 6440. We report on the spectral and timing analysis of SAX J1748.9-2021 performed on AstroSat data taken during its faint and short outburst of 2017. We derived the best-fitting orbital solution for the 2017 outburst and obtained an avera…
Comparisons Between Jupiter's X-ray, UV and Radio Emissions and In-Situ Solar Wind Measurements During 2007
Jackman, C. M.; Lamy, L.; Branduardi-Raymont, G. +21 more
We compare Chandra and XMM-Newton X-ray observations of Jupiter during 2007 with a rich multi-instrument data set including upstream in situ solar wind measurements from the New Horizons spacecraft, radio emissions from the Nançay Decametric Array and Wind/Waves, and ultraviolet (UV) observations from the Hubble Space Telescope. New Horizons data …
IRIS Mg II Observations and Non-LTE Modeling of Off-limb Spicules in a Solar Polar Coronal Hole
Heinzel, Petr; Shibata, Kazunari; Okamoto, Takenori J. +4 more
We investigated the off-limb spicules observed in the Mg II h and k lines by IRIS in a solar polar coronal hole. We analyzed the large data set of obtained spectra to extract quantitative information about the line intensities, shifts, and widths. The observed Mg II line profiles are broad and double peaked at lower altitudes, broad but flat toppe…
Spatially resolved spectroscopy of close massive visual binaries with HST/STIS. I. Seven O-type systems
Maíz Apellániz, J.; Barbá, R. H.
Context. The spectroscopic characterization of many O-type stars is hampered by a nearby companion.
Aims: We want to obtain spatially resolved spectroscopy of close O-type visual binaries to derive their spectral types.
Methods: We used the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) to obtain long-sli…
Radial variation of the stellar mass functions in the globular clusters M15 and M30: clues of a non-standard IMF?
Dalessandro, E.; Monaco, L.; Beccari, G. +5 more
We exploit a combination of high-resolution Hubble Space Telescope and wide-field ESO-VLT observations to study the slope of the global mass function (αG) and its radial variation (α(r)) in the two dense, massive and post core-collapse globular clusters M15 and M30. The available data set samples the clusters' main sequence down to ∼0.2…
Rest-frame UV properties of luminous strong gravitationally lensed Lyα emitters from the BELLS GALLERY Survey
Pérez-Fournon, I.; Poidevin, F.; Shirley, R. +15 more
We present deep rest-frame UV spectroscopic observations using the Gran Telescopio Canarias of six gravitationally lensed Lyα emitters (LAEs) at 2.36 < z < 2.82 selected from the BELLS GALLERY survey. By taking the magnifications into account, we show that LAEs can be as luminous as LLyα ≃ 30 × 1042 erg s-1 a…
The Ionized- and Cool-gas Content of the BR1202-0725 System as Seen by MUSE and ALMA
Walter, F.; Riechers, D.; Decarli, R. +7 more
We present Multi Unit Spectroscopic Explorer (MUSE) observations of the gas-rich major merger BR1202-0725 at z ∼ 4.7, which constitutes one of the most overdense fields known in the early universe. We utilize these data in conjunction with existing Atacama Large Millimeter/submillimeter Array (ALMA) observations to compare and contrast the spatial…