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Possible substellar companions in dwarf eclipsing binaries. SDSS J143547.87+373338.5, NSVS 7826147, and NSVS 14256825
Merc, J.; Wolf, M.; Zejda, M. +4 more
We present the new results of our long-term observational project to detect the small variations in the orbital periods of low-mass and short-period eclipsing binaries. About 120 new precise mid-eclipse times were obtained for three relatively well-known dwarf eclipsing binaries: SDSS J143547.87+373338.5 (P = 0.126 d), NSVS 07826147 (0.162 d), and…
New mid-infrared imaging constraints on companions and protoplanetary disks around six young stars
Waters, L. B. F. M.; Kamp, I.; Quanz, S. P. +13 more
Context. Mid-infrared (mid-IR) imaging traces the sub-micron and micron-sized dust grains in protoplanetary disks and it offers constraints on the geometrical properties of the disks and potential companions, particularly if those companions have circumplanetary disks.
Aims: We use the VISIR instrument and its upgrade NEAR on the VLT to take …
Exotic image formation in strong gravitational lensing by clusters of galaxies - II. Uncertainties
Ghosh, Agniva; Williams, Liliya L. R.; Meena, Ashish Kumar +1 more
Due to the finite amount of observational data, the best-fitting parameters corresponding to the reconstructed cluster mass have uncertainties. In turn, these uncertainties affect the inferences made from these mass models. Following our earlier work, we have studied the effect of such uncertainties on the singularity maps in simulated and actual …
Herschel and Odin observations of H2O, CO, CH, CH+, and [N II] in the barred spiral galaxy NGC 1365. Bar-induced activity in the outer and inner circumnuclear tori
Larsson, B.; Rydbeck, G.; Frisk, U. +3 more
Context. The Odin satellite is now into its twentieth year of operation, much surpassing its design life of two years. One of its major astronomical pursuits was the search for and study of water vapor in diverse regions of the Solar System and the Milky Way galaxy. The Herschel space observatory was needed to detect water vapor in external galaxi…
Discovery of new mercury-manganese stars, including a fast rotator
Nuñez, N. E.; González, J. F.; Veramendi, M. E. +3 more
The origin of mercury-manganese (HgMn) stars is still poorly understood and the statistical analysis of an extensive sample of well characterized objects would be very valuable. Nevertheless, the compilation of a clean and reliable list of all known HgMn stars, and complete characterization of those objects, is still a pending issue. We report the…
Solar rotational period of cosmic rays and solar activity during the maximum phase of solar cycle 24
Singh, A. K.; Singh, P. R.; Farid, A. I. Saad +2 more
To study the solar rotational oscillation on daily averaged time series of solar activity proxies: sunspot number (SSN), modified coronal index (MCI), solar flare index (FI), and cosmic ray intensity (CRI) are subjected to Lomb/Scargle periodogram, and continuous wavelet transform. For this purpose, we have used data of all the considered paramete…
Searching for Active Low-mass Stars in the CMa Star-forming Region: Multi-band Photometry with T80S
Montmerle, T.; Galli, P. A. B.; Perottoni, H. D. +10 more
An exotic environment surrounds the young stellar groups associated with the Canis Major (CMa) OB1/R1 region, which probably was formed under feedback from at least three supernova events having occurred a few million years ago. We use astrometric data from the Gaia-DR2 to confirm the membership of the stars in CMa R1, based on proper motion and p…
Improvements to Pan-STARRS1 Astrometry Using Gaia
White, Richard L.; Shiao, Bernie; Lubow, Stephen H.
We use the Gaia DR2 catalog to improve the astrometric accuracy of about 1.7 billion objects in Pan-STARRS1 Data Release 2 (PS1 DR2). We also obtain proper motions for these PS1 objects. The cross-match between Gaia and PS1 reveals residuals that are correlated on a scale of about 1'. We apply a spatially adaptive correction algorithm for all PS1 …
Characterising atmospheric gravity waves on the nightside lower clouds of Venus: a systematic analysis
Lebonnois, S.; Machado, P.; Peralta, J. +3 more
We present the detection and characterisation of mesoscale waves on the lower clouds of Venus using images from the Visible Infrared Thermal Imaging Spectrometer onboard the European Venus Express space mission and from the 2 µm camera (IR2) instrument onboard the Japanese space mission Akatsuki. We used image navigation and processing techn…
Multi-epoch properties of the warm absorber in the Seyfert 1 galaxy NGC 985
Kaastra, J. S.; Kriss, G. A.; Ebrero, J. +1 more
Context. NGC 985 was observed by XMM-Newton twice in 2015, revealing that the source was coming out from a soft X-ray obscuration event that took place in 2013. These kinds of events are possibly recurrent since a previous XMM-Newton archival observation in 2003 also showed signatures of partial obscuration.
Aims: We have analyzed the high-re…