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Qatar Exoplanet Survey: Qatar-7b—A Very Hot Jupiter Orbiting a Metal-rich F-Star
Bieryla, Allyson; Latham, David W.; Esquerdo, Gilbert A. +18 more
We present the discovery of Qatar-7b—a very hot and inflated giant gas planet orbiting close to its parent star. The host star is a relatively massive main-sequence F-star with mass and radius {M}\star =1.41+/- 0.03 {M}⊙ and {R}\star =1.56+/- 0.02 {R}⊙ , respectively, at a distance d = 726 ± 26 pc, and …
On the geometry of the X-ray emission from pulsars: the changing aspect of the Be/X-ray pulsar SXP348
Zezas, A.; Coe, M. J.; Laycock, S. G. T. +2 more
The X-ray source SXP348 is a high-mass X-ray binary system in the Small Magellanic Cloud. Since its 1998 discovery by BeppoSAX, this pulsar has exhibited a spin period of ∼340-350 s. In an effort to determine the orientation and magnetic geometry of this source, we used our geometric model Polestar to fit 71 separate pulse profiles extracted from …
Jupiter's Turbulent Power Spectra From Hubble Space Telescope
Morales-Juberías, Raúl; Simon, Amy; Cosentino, Richard G.
Turbulence in Jupiter's atmosphere was investigated with archival and ongoing observations from the Hubble Space Telescope. Data sets that include one full rotation (360° longitude coverage) were used to produce complete maps of the planet's upper cloud layer. The global maps were analyzed to generate the passive tracer power spectrum of cloud fea…
A three-dimensional model of spiral null pair to form ion-scale flux ropes in magnetic reconnection region observed by Cluster
Dunlop, Malcolm; He, Jiansen; Xie, Lun +10 more
The magnetic structure and topology of the three-dimensional magnetic reconnection region are significantly dynamic and complex. Small-scale flux ropes and magnetic null points are frequently detected in the reconnection outflow region and diffusion region due to the increased in situ measurements at high temporal cadences. Previous studies have d…
NGC 7457: evidence for merger-driven cylindrical rotation in disc galaxies
Peletier, R. F.; Falcón-Barroso, J.; Aguerri, J. A. L. +7 more
We construct Schwarzschild orbit-based models of NGC 7457, known as a peculiar low-mass lenticular galaxy. Our best-fitting model successfully retrieves most of the unusual kinematics behaviours of this galaxy, in which, the orbital distribution of stars is dominated by warm and hot orbits. The reconstructed surface brightness of the hot component…
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…