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The K2-ESPRINT project. VI. K2-105 b, a hot Neptune around a metal-rich G-dwarf
Tamura, Motohide; Hirano, Teruyuki; Sato, Bun'ei +17 more
We report on the confirmation that the candidate transits observed for the star EPIC 211525389 are due to a short-period Neptune-sized planet. The host star, located in K2 campaign field 5, is a metal-rich ([Fe/H] = 0.26 ± 0.05) G-dwarf (Teff = 5430 ± 70 K and log g = 4.48 ± 0.09), based on observations with the High Dispersion Spectrog…
On-Ground Performance and Calibration of the ExoMars Trace Gas Orbiter CaSSIS Imager
Cremonese, G.; Da Deppo, V.; Thomas, N. +22 more
The European Space Agency's ExoMars Trace Gas Orbiter (TGO) seeks to investigate the biological or geological origin of trace gases found on Mars. The TGO carries a payload of four instruments in order to reach its scientific goals, including the Colour and Stereo Surface Imaging System (CaSSIS). CaSSIS is a colour and stereo telescopic camera tha…
Relation of CME Speed and Magnetic Helicity in CME Source Regions on the Sun during the Early Phase of Solar Cycles 23 and 24
Cho, K. -S.; Jang, S.; Kim, R. -S. +2 more
To investigate the relations between coronal mass ejection (CME) speed and magnetic field properties measured in the photospheric surface of CME source regions, we selected 22 disk CMEs in the rising and early maximum phases of the current Solar Cycle 24. For the CME speed, we used two-dimensional (2D) projected speed observed by the Large Angle a…
Wide- and contact-binary formation in substructured young stellar clusters
Moraux, E.; Dorval, J.; Boily, C. M. +1 more
We explore with collisional gravitational N-body models the evolution of binary stars in initially fragmented and globally subvirial clusters of stars. Binaries are inserted in the (initially) clumpy configurations so as to match the observed distributions of the field-binary-stars' semimajor axes a and binary fraction versus primary mass. The dis…
Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS
Tiengo, Andrea; Haberl, Frank; Belfiore, Andrea +9 more
We performed a search for eclipsing and dipping sources in the archive of the EXTraS project—a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A system…
Long-term optical and X-ray variability of the Be/X-ray binary H 1145-619: Discovery of an ongoing retrograde density wave
Mas-Hesse, J. M.; Coe, M. J.; Reig, P. +7 more
Context. Multiwavelength monitoring of Be/X-ray binaries is crucial to understand the mechanisms producing their outbursts. H 1145-619 is one of these systems, which has recently displayed X-ray activity.
Aims: We investigate the correlation between the optical emission and X-ray activity to predict the occurrence of new X-ray outbursts from …
The Evolution of Juventae Chasma, Valles Marineris, Mars: Progressive Collapse and Sedimentation
Hauber, E.; Rossi, A. P.; Flahaut, J. +3 more
Juventae Chasma is an isolated chasm located north of the interconnected chasms within Valles Marineris. It contains four separate interior layered deposit (ILD) mounds. We have combined layer measurements, as well as mineralogical data of the mounds with topographic data of the remaining chasm and the surrounding plateau. Our observations indicat…
Interstellar extinction in Orion: variation of the strength of the ultraviolet bump across the complex
Beitia-Antero, Leire; Gómez de Castro, Ana I.
There is growing observational evidence of dust coagulation in the dense filaments within molecular clouds. Infrared observations show that the dust grain size distribution becomes shallower and the relative fraction of small to large dust grains decreases as the local density increases. Ultraviolet (UV) observations show that the strength of the …
Cosmology with XMM galaxy clusters: the X-CLASS/GROND catalogue and photometric redshifts
Greiner, J.; Salvato, M.; Nandra, K. +11 more
The XMM Cluster Archive Super Survey (X-CLASS) is a serendipitously detected X-ray-selected sample of 845 galaxy clusters based on 2774 XMM archival observations and covering an approximately 90 deg2 spread across the high-Galactic latitude (|b| > 20°) sky. The primary goal of this survey is to produce a well-selected sample of galax…
Rapid optical variations correlated with X-rays in the 2015 second outburst of V404 Cygni (GS 2023+338)
Nogami, Daisaku; Shidatsu, Megumi; Kato, Taichi +24 more
We present optical multicolour photometry of V404 Cyg during the outburst from 2015 December to 2016 January together with the simultaneous X-ray data. This outburst occurred less than six months after the previous outburst in 2015 June-July. These two outbursts in 2015 were of a slow-rise and rapid-decay type and showed large-amplitude (∼2 mag) a…