Search Publications
A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
Kalas, Paul; De Rosa, Robert J.
We present an investigation into the kinematics of HD 106906 using the newly released Gaia DR2 catalog to search for close encounters with other members of the Scorpius-Centaurus (Sco-Cen) association. HD 106906 is an eccentric spectroscopic binary that hosts both a large asymmetric debris disk extending out to at least 500 au and a directly image…
ALMA Observations of Atomic Carbon [C I] ( 3 P 1 → 3 P 0 ) and Low-J CO Lines in the Starburst Galaxy NGC 1808
Seta, Masumichi; Salak, Dragan; Nakai, Naomasa +1 more
We present [C I] ≤ft({}3{{P}}1\to {}3{{P}}0\right), 12CO, 13CO, and C18O (J=2\to 1) observations of the central region (radius 1 kpc) of the starburst galaxy NGC 1808 at 30-50 pc resolution conducted with the Atacama Large Millimeter/submillimeter Array. Radiative transfe…
SCUBA-2 observations of candidate starbursting protoclusters selected by Planck and Herschel-SPIRE
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We present SCUBA-2 850 µm observations of 13 candidate starbursting protoclusters selected using Planck and Herschel data. The cumulative number counts of the 850 µm sources in 9 of 13 of these candidate protoclusters show significant overdensities compared to the field, with the probability <10-2 assuming the sources are…
The Precious Set of Radio-optical Reference Frame Objects in the Light of Gaia DR2 Data
Schmitt, Henrique R.; Makarov, Valeri V.; Berghea, Ciprian T. +2 more
We investigate a sample of 3413 International Celestial Reference Frame (ICRF3) extragalactic radio-loud sources with accurate positions determined by very long baseline interferometry in the S/X band, mostly active galactic nuclei and quasars, which are cross-matched with optical sources in the second Gaia data release (Gaia DR2). The main goal o…
Alfvén Wave Propagation in the Io Plasma Torus
Bagenal, F.; Bonfond, B.; Hinton, P. C.
Io, the most volcanically active body in the solar system, fuels a plasma torus around Jupiter with dissociation products of SO2 at a rate of 1,000 kg/s. We use a combination of in situ Voyager 1 data and Cassini Ultraviolet Imaging Spectrograph observations to constrain a diffusive equilibrium model of the Io plasma torus. The interact…
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…