Search Publications
Using deep Residual Networks to search for galaxy-Ly α emitter lens candidates based on spectroscopic selection
Wang, Jiancheng; Shu, Yiping; Li, Rui +4 more
More than 100 galaxy-scale strong gravitational lens systems have been found by searching for the emission lines coming from galaxies with redshifts higher than the lens galaxies. Based on this spectroscopic-selection method, we introduce the deep Residual Networks (ResNet; a kind of deep Convolutional Neural Networks) to search for the galaxy-Ly …
CI Camelopardalis: The first sgB[e]-high mass X-ray binary twenty years on: A supernova imposter in our own Galaxy?
Bartlett, E. S.; Negueruela, I.; Clark, J. S.
Context. The Galactic supergiant B[e] star CI Camelopardalis (CI Cam) was the first sgB[e] star detected during an X-ray outburst. The star brightened to ∼2 Crab in the X-ray regime (∼5 × 10-8 ergs cm-2 s-1 in the 2-25 keV range) within hours before decaying to a quiescent level in less than two weeks, clearly indi…
When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121
de Grijs, Richard; Li, Chengyuan
Star-to-star light-element abundance variations, known as multiple stellar populations (MPs), are common in almost all Galactic globular clusters. Recently, MPs have also been detected in a number of massive clusters with ages in excess of 2 Gyr in the Large Magellanic Cloud (LMC), thus indicating that age is likely a control parameter for the pre…
RPC-MIP observations at comet 67P/Churyumov-Gerasimenko explained by a model including a sheath and two populations of electrons
Henri, P.; Vallières, X.; Wattieaux, G. +2 more
The response of the mutual impedance probe RPC-MIP on board Rosetta orbiter electrostatically modeled considering an unmagnetized and collisionless plasma with two Maxwellian electron populations. A vacuum sheath surrounding the probe was considered in our model in order to take the ion sheath into account that is located around the probe, which i…
MoMo: a new empirical model of the Mars ionospheric total electron content based on Mars Express MARSIS data
Peter, Kerstin; Witasse, Olivier; Kofman, Wlodek +5 more
Aims: Several scientific landers and rovers have reached the Martian surface since the 1970s. Communication between the asset (i.e., lander or rover) and Mars orbiters or Earth antennas uses radio signals in UHF to X-band frequencies passing through the Mars' ionosphere. It is consequently necessary to take into account electron density variation …
Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters
Bieryla, Allyson; Latham, David W.; Esquerdo, Gilbert A. +26 more
In this paper we present three new extrasolar planets from the Qatar Exoplanet Survey. Qatar-8b is a hot Saturn, with M P = 0.37 M J and R P = 1.3 R J, orbiting a solar-like star every P orb = 3.7 days. Qatar-9b is a hot Jupiter with a mass of M P = 1.2 M J and a radius o…
Jensen-Shannon Complexity Measurements in Solar Wind Magnetic Field Fluctuations
Kivelson, Margaret G.; Weygand, James M.
Turbulent magnetic field fluctuations in the solar wind have been extensively investigated, but few studies have analyzed their complexity. Jensen-Shannon complexity maps of time series data provide a mathematical tool that can characterize fluctuations in laboratory experiments as stochastic, chaotic, or periodic phenomena. We apply this recently…
On the Source Position and Duration of a Solar Type III Radio Burst Observed by LOFAR
Kontar, Eduard P.; Zhang, PeiJin; Yu, SiJie +1 more
The flux of solar type III radio bursts have a time profile of rising and decay phases at a given frequency, which has been actively studied since the 1970s. Several factors that may influence the duration of a type III radio burst have been proposed. In this work, to study the dominant cause of the duration, we investigate the source positions of…
First Radial Velocity Results From the MINiature Exoplanet Radial Velocity Array (MINERVA)
Swift, Jonathan J.; Berlind, Perry; Calkins, Michael L. +52 more
The MINiature Exoplanet Radial Velocity Array (MINERVA) is a dedicated observatory of four 0.7 m robotic telescopes fiber-fed to a KiwiSpec spectrograph. The MINERVA mission is to discover super-Earths in the habitable zones of nearby stars. This can be accomplished with MINERVA’s unique combination of high precision and high cadence over long tim…
SOFIA/FORCAST resolves 30-40 µm extended dust emission in nearby active galactic nuclei
Togi, Aditya; Alonso-Herrero, Almudena; Fuller, Lindsay +7 more
We present arcsecond-scale observations of the active galactic nuclei (AGNs) of seven nearby Seyfert galaxies observed from the Stratospheric Observatory For Infrared Astronomy (SOFIA) using the 31.5 and 37.1 µm filters of the Faint Object infraRed CAmera for the SOFIA Telescope (FORCAST). We isolate unresolved emission from the torus and fi…