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Effects of Coronal Density and Magnetic Field Distributions on a Global Solar EUV Wave
Wang, Rui; Yang, Zhongwei; Liu, Ying D. +4 more
We investigate a global extreme-ultraviolet (EUV) wave associated with a coronal mass ejection (CME)-driven shock on 2017 September 10. The EUV wave is transmitted by north- and south-polar coronal holes (CHs), which is observed by the Solar Dynamics Observatory (SDO) and Solar Terrestrial Relations Observatory A (STEREO-A) from opposite sides of …
Classifying exoplanet candidates with convolutional neural networks: application to the Next Generation Transit Survey
Wheatley, Peter J.; Eigmüller, Philipp; Casewell, Sarah L. +13 more
Vetting of exoplanet candidates in transit surveys is a manual process, which suffers from a large number of false positives and a lack of consistency. Previous work has shown that convolutional neural networks (CNN) provide an efficient solution to these problems. Here, we apply a CNN to classify planet candidates from the Next Generation Transit…
Origin of Radio-quiet Coronal Mass Ejections in Flare Stars
Mullan, D. J.; Paudel, R. R.
Type II radio bursts are observed in the Sun in association with many coronal mass ejections (CMEs). In view of this association, there has been an expectation that, by scaling from solar flares to the flares that are observed on M dwarfs, radio emission analogous to solar type II bursts should be detectable in association with M dwarf flares. How…
VIS3COS. II. Nature and nurture in galaxy structure and morphology
van der Wel, Arjen; Sobral, David; Darvish, Behnam +7 more
We study the impact of local density and stellar mass on the structure and morphology of approximately 500 quiescent and star-forming galaxies from the VIMOS Spectroscopic Survey of a Superstructure in COSMOS (VIS3COS). We perform bulge-to-disc decomposition of the surface brightness profiles and find ∼41 ± 3% of > 1010 M<…
Mapping the stellar age of the Milky Way bulge with the VVV. II. Deep JKs catalog release based on PSF photometry
Minniti, D.; Rejkuba, M.; Zoccali, M. +6 more
Context. The bulge represents the best compromise between old and massive Galactic components, and as such its study is a valuable opportunity to understand how the bulk of the Milky Way formed and evolved. In addition, being the only bulge in which we can individually resolve stars in all evolutionary sequences, the properties of its stellar cont…
Spectral analysis of the extremely hot DA white dwarf PG 0948+534
Rauch, T.; Werner, K.; Reindl, N.
There is a striking paucity of hydrogen-rich (DA) white dwarfs (WDs) relative to their hydrogen-deficient (non-DA) counterparts at the very hot end of the WD cooling sequence. The three hottest known DAs (surface gravity log g ≥ 7.0) have effective temperatures around T_{eff} = 140 000 K, followed by only five objects in the range 104 000-120 000 …
The chemical structure of the very young starless core L1521E
Nagy, Z.; Caselli, P.; Spezzano, S. +5 more
Context. L1521E is a dense starless core in Taurus that was found to have relatively low molecular depletion by earlier studies, thus suggesting a recent formation.
Aims: We aim to characterize the chemical structure of L1521E and compare it to the more evolved L1544 pre-stellar core.
Methods: We have obtained 2.5 × 2.5 arcminute maps to…
A deep X-ray view of the bare AGN Ark 120. V. Spin determination from disc-Comptonisation efficiency method
Stern, D.; Farrah, D.; Done, C. +13 more
Context. The spin of supermassive black holes (SMBH) in active galactic nuclei (AGN) can be determined from spectral signature(s) of relativistic reflection such as the X-ray iron Kα line profile, but this can be rather uncertain when the line of sight intersects the so-called warm absorber and/or other wind components as these distort the continu…
The Swift UVOT Stars Survey. III. Photometry and Color-Magnitude Diagrams of 103 Galactic Open Clusters
Hagen, Lea M. Z.; Siegel, Michael H.; Porterfield, Blair L. +2 more
As part of the Swift/Ultraviolet-Optical Telescope Stars Survey, we present near-ultraviolet (NUV; 3000-1700 Å) point-source photometry for 103 Galactic open clusters. These data, taken over the span of the mission, provide a unique and unprecedented set of NUV point-source photometry on simple stellar populations. After applying a membership anal…
Greening of the brown-dwarf desert. EPIC 212036875b: a 51 MJ object in a 5-day orbit around an F7 V star
Cochran, William D.; Endl, Michael; Redfield, Seth +55 more
Context. Although more than 2000 brown dwarfs have been detected to date, mainly from direct imaging, their characterisation is difficult due to their faintness and model-dependent results. In the case of transiting brown dwarfs, however, it is possible to make direct high-precision observations.
Aims: Our aim is to investigate the nature and…