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Transit analysis of the CoRoT-5, CoRoT-8, CoRoT-12, CoRoT-18, CoRoT-20, and CoRoT-27 systems with combined ground- and space-based photometry
Heras, A. M.; Casanova, V.; Fernández, M. +2 more
We have initiated a dedicated project to follow-up with ground-based photometry the transiting planets discovered by CoRoT in order to refine the orbital elements, constrain their physical parameters, and search for additional bodies in the system. From 2012 September to 2016 December we carried out 16 transit observations of six CoRoT planets (Co…
The true nature of Swift J0746.3-1608: a possible Intermediate Polar showing accretion state changes
Mukai, K.; de Martino, D.; Bernardini, F. +1 more
Optical and X-ray observations suggested that the 9.38 h binary, SWIFT J0746.3-1608 could be a cataclysmic variable (CV) of the magnetic or nova-like type, or a low-mass X-ray binary. Its optical, UV, and X-ray light curves are strongly variable over years. We report on a recent XMM-Newton observation (2018 April 28), when the source had recovered…
First resolved observations of a highly asymmetric debris disc around HD 160305 with VLT/SPHERE
Boccaletti, Anthony; Ménard, François; Kral, Quentin +36 more
Context. Direct imaging of debris discs gives important information about their nature, their global morphology, and allows us to identify specific structures possibly in connection with the presence of gravitational perturbers. It is the most straightforward technique to observe planetary systems as a whole.
Aims: We present the first resolv…
Elemental Abundance Distributions in the (R, V ϕ ) Plane with LAMOST DR5 and Gaia DR2
Zhao, Gang; Chen, Yuqin; Zhao, Jingkun +4 more
Since Gaia DR2 was released, many velocity structures in the disk have been revealed, such as large-scale ridge-like patterns in phase space. Both kinematic information and stellar elemental abundances are needed to reveal their evolution history. We have used labels from the APOGEE survey to predict elemental abundances for a huge amount of low-r…
Long-term stellar variability in the Galactic Centre region
Minniti, D.; Catelan, M.; Lucas, P. W. +5 more
We report the detection of variable stars within a 11.5 arcmin× 11.5 arcmin region near the Galactic Centre that includes the Arches and Quintuplet clusters, as revealed by the VISTA Variables in the Vía Láctea survey. There are 353 sources that show KS-band variability, of which the large majority (81 per cent) correspond to red giant …
The GALAH survey: a catalogue of carbon-enhanced stars and CEMP candidates
Lewis, Geraint F.; Ting, Yuan-Sen; Buder, Sven +20 more
Swan bands - characteristic molecular absorption features of the C2 molecule - are a spectroscopic signature of carbon-enhanced stars. They can also be used to identify carbon-enhanced metal-poor (CEMP) stars. The GALAH (GALactic Archaeology with Hermes) is a magnitude-limited survey of stars producing high-resolution, high-signal-to-no…
Observations on a Series of Merging Magnetic Flux Ropes Within an Interplanetary Coronal Mass Ejection
Zhao, Yan; Feng, Hengqiang; Zhao, Guoqing +2 more
Coronal mass ejections (CMEs) are intense solar explosive eruptions. CMEs are highly important players in solar-terrestrial relationships, and they have important consequences for major geomagnetic storms and energetic particle events. It has been unclear how CMEs evolve when they propagate in the heliosphere. Here we report an interplanetary CME …
First stellar occultation by the Galilean moon Europa and upcoming events between 2019 and 2021
Maury, A.; Cacella, P.; Lainey, V. +21 more
Context. Bright stellar positions are now known with an uncertainty below 1 mas thanks to Gaia DR2. Between 2019-2020, the Galactic plane will be the background of Jupiter. The dense stellar background will lead to an increase in the number of occultations, while the Gaia DR2 catalogue will reduce the prediction uncertainties for the shadow path. …
On the possibility of detecting ultrashort period exoplanets with LISA
Wong, Kaze W. K.; Berti, Emanuele; Gabella, William E. +1 more
Cunha, Silva & Lima recently reexamined the possibility of detecting gravitational waves from exoplanets, claiming that three ultrashort period systems would be observable by LISA. We revisit their analysis and conclude that the currently known exoplanetary systems are unlikely to be detectable, even assuming a LISA observation time Tobs<…
Formation of the Y Feature at the Venusian Cloud Top by Planetary-Scale Waves and the Mean Circulation: Analysis of Venus Express VMC Images
Kouyama, T.; Yamada, M.; Nara, Y. +6 more
The relationship between the planetary-scale ultraviolet contrast known as the Y feature and the wind field at the Venusian cloud top was investigated by using images obtained by Venus Monitoring Camera (VMC) on ESA's Venus Express. Spectral analyses of the ultraviolet reflectivity and the wind field revealed common periodicities of 4-5 Earth days…