Search Publications
Magnetometer in-flight offset accuracy for the BepiColombo spacecraft
Plaschke, Ferdinand; Volwerk, Martin; Narita, Yasuhito +6 more
Recently the two-spacecraft mission BepiColombo launched to explore the plasma and magnetic field environment of Mercury. Both spacecraft, the Mercury Planetary Orbiter (MPO) and the Mercury Magnetospheric Orbiter (MMO, also referred to as Mio), are equipped with fluxgate magnetometers, which have proven to be well-suited to measure the magnetic f…
Searches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques
Cheng, K. S.; Takata, J.; Kong, A. K. H. +7 more
We report the results of searching pulsar-like candidates from the unidentified objects in the Third Catalog of Hard Fermi-LAT Sources (3FHL). Using a machine-learning-based classification scheme with a nominal accuracy of $\sim \!98{{\, \rm per\, cent}}$, we have selected 27 pulsar-like objects from 200 unidentified 3FHL sources for an identifica…
Constraining VLBI-optical offsets in high redshift galaxies using strong gravitational lensing
Barnacka, Anna; Spingola, Cristiana
We present a multiwavelength analysis of two highly magnified strong gravitationally lensed galaxies, CLASS B0712+472 and CLASS B1608+656, at redshifts 1.34 and 1.394, respectively, using new VLBI (very long baseline interferometry) and archival Hubble Space Telescope observations. We reconstruct the positions of the radio and optical emissions wi…
Robustly Detecting Changes in Warm Jupiters' Transit Impact Parameters
Dawson, Rebekah I.
Torques from a mutually inclined perturber can change a transiting planet's impact parameter, resulting in variations in the transit shape and duration. Detection of and upper limits on changes in impact parameter yield valuable constraints on a planetary system's three-dimensional architecture. Constraints for warm Jupiters are particularly inter…
MIFAL: fully automated Multiple-Image Finder ALgorithm for strong-lens modelling - proof of concept
Zitrin, Adi; Carrasco, Mauricio; Seidel, Gregor
We outline a simple procedure designed for automatically finding sets of multiple images in strong lensing (SL) clusters. We show that by combining (a) an arc-finding (or source extracting) program, (b) photometric redshift measurements, and (c) a preliminary light-traces-mass lens model, multiple-image systems can be identified in a fully automat…
Polarimetry of the superluminous transient ASASSN-15lh
Sollerman, J.; Maund, J. R.; Patat, F. +3 more
ASASSN-15lh is the intrinsically brightest transient observed to date. Despite being the subject of concerted photometric and spectroscopic observing campaigns, there is still significant debate about the true nature of this transient and the mechanism responsible for its great luminosity. Here we report five epochs of imaging polarimetry and two …
The Composite X-Ray Spectrum of 3CRR Quasars
Gu, Minfeng; Zhou, Minhua
The reason for the difference between the composite X-ray spectrum for radio-loud quasars (RLQs) versus radio-quiet quasars (RQQs) is still unclear. To study this difference, we built a new composite X-ray spectrum of RLQs using Chandra X-ray data and Sloan Digital Sky Survey optical data for the sample of 3CRR quasars. We find the X-ray spectra o…
Analysis of a long-duration AR throughout five solar rotations: Magnetic properties and ejective events
Ugarte-Urra, Ignacio; Mandrini, Cristina H.; Cremades, Hebe +4 more
Coronal mass ejections (CMEs), which are among the most magnificent solar eruptions, are a major driver of space weather and can thus affect diverse human technologies. Different processes have been proposed to explain the initiation and release of CMEs from solar active regions (ARs), without reaching consensus on which is the predominant scenari…
Study of the Dynamics of Convective Turbulence in the Solar Granulation by Spectral Line Broadening and Asymmetry
Katsukawa, Yukio; Ishikawa, Ryohtaroh T.; Oba, Takayoshi +3 more
In quiet regions on the solar surface, turbulent convective motions of granulation play an important role in creating small-scale magnetic structures, as well as in energy injection into the upper atmosphere. The turbulent nature of granulation can be studied using spectral line profiles, especially line broadening, which contain information on th…
Flare Properties of A-type Stars in Kepler Data
Esamdin, Ali; Bai, Jian-Ying
We analyzed the long-cadence (LC) light curves of 5435 stars with effective temperatures of 7000-10,500 K in Data Release 25 of Kepler to extend the samples of A-type flare stars and study their flare properties. A total of 103 flare stars are detected, of which 72 have the Large Sky Area Multi-Object fiber Spectroscopic Telescope spectral types, …