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Charge-exchange soft X-ray emission of highly charged ions with inclusion of multiple-electron capture
Cui, W.; Zhao, G.; Wu, Y. +7 more
Charge exchange has been recognized as a primary source of soft X-ray emission in many astrophysical outflow environments, including cometary and planetary exospheres impacted by the solar wind. Some models have been set up by using different data collections of charge-exchange cross-sections. However, multiple-electron transfer has not been inclu…
High-resolution X-ray spectroscopy of supergiant HMXB 4U 1700-37 during the compact object eclipse
Grinberg, V.; Hainich, R.; Torrejón, J. M. +6 more
We present an analysis of the first observation of the iconic high-mass X-ray binary 4U 1700-37 with the Chandra High-Energy Transmission Gratings (HETGs) during an X-ray eclipse. The goal of the observation was to study the structure/physical conditions in the clumpy stellar wind through high-resolution spectroscopy. We find the following: (a) Em…
The SOPHIE search for northern extrasolar planets. XVIII. Six new cold Jupiters, including one of the most eccentric exoplanet orbits
Bouchy, F.; Deleuil, M.; Moutou, C. +28 more
Context. Due to their low transit probability, the long-period planets are, as a population, only partially probed by transit surveys. Radial velocity surveys thus have a key role to play, in particular for giant planets. Cold Jupiters induce a typical radial velocity semi-amplitude of 10 m s−1, which is well within the reach of multipl…
The link between gas and stars in the S254-S258 star-forming region
Juvela, M.; Kirsanova, M. S.; Sobolev, A. M. +5 more
The paper aims to study relation between the distributions of the young stellar objects (YSOs) of different ages and the gas-dust constituents of the S254-S258 star formation complex. This is necessary to study the time evolution of the YSO distribution with respect to the gas and dust compounds that are responsible for the birth of the young star…
Background Short-period Eclipsing Binaries in the Original Kepler Field
Bódi, Attila; Szabó, Róbert; Forró, Adrienn +2 more
During the primary Kepler mission, between 2009 and 2013, about 150,000 preselected targets were observed with a 29.42 minute long cadence. However, a survey of background stars that fall within the field of view (FOV) of the downloaded apertures of the primary targets has revealed a number of interesting objects. In this paper, we present the res…
Resolving the inner accretion flow towards the central supermassive black hole in SDSS J1339+1310
Goicoechea, L. J.; Sergeyev, A. V.; Shalyapin, V. N. +2 more
We studied the accretion disc structure in the doubly imaged lensed quasar SDSS J1339+1310 using r-band light curves and UV-visible to near-IR spectra from the first 11 observational seasons after its discovery. The 2009-2019 light curves displayed pronounced microlensing variations on different timescales, and this microlensing signal permitted u…
X-Ray Evidence Against the Hypothesis that the Hyperluminous z = 6.3 Quasar J0100+2802 is Lensed
Connor, Thomas; Stern, Daniel; Bañados, Eduardo +1 more
The z = 6.327 quasar SDSS J010013.02+280225.8 (hereafter J0100+2802) is believed to be powered by a black hole more massive than 1010 M ⊙, making it the most massive black hole known in the first billion years of the universe. However, recent high-resolution ALMA imaging shows four structures at the location of this quasar, p…
Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST
Bird, Sarah A.; Zhao, Gang; Liu, Chao +5 more
We identify 1325 member candidates of the open cluster (OC) Stock 2 using data from Gaia DR2. We use the algorithms Clusterix 2.0 and HDBSCAN to select cluster candidates and further refine the final cluster membership by defining neighbors in 5D phase space (Xcp, Ycp, ${Z}_{\mathrm{cp}},\kappa \cdot {\mu }_{\alpha }^{* }$ /ϖ…
Observational constraints to the dynamics of dust particles in the coma of comet 67P/Churyumov-Gerasimenko
Sierks, H.; Fulle, M.; Güttler, C. +18 more
In this work, we aim to characterize the dust motion in the inner coma of comet 67P/Churyumov-Gerasimenko to provide constraints for theoretical 3D coma models. The OSIRIS camera on-board the Rosetta mission was able for the first time to acquire images of single dust particles from inside the cometary coma, very close to the nucleus. We analyse a…
The VVV open cluster project. Near-infrared sequences of NGC 6067, NGC 6259, NGC 4815, Pismis 18, Trumpler 23, and Trumpler 20
Peña Ramírez, K.; Chené, A. -N.; Ramírez Alegría, S. +1 more
Open clusters are central elements of our understanding of the Galactic disc evolution, as an accurate determination of their parameters leads to an unbiased picture of our Galaxy's structure. Extending the analysis towards fainter magnitudes in cluster sequences has a significant impact on the derived fundamental parameters, such as extinction an…