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Using dimensionality reduction and clustering techniques to classify space plasma regimes
Verscharen, Daniel; Walsh, Andrew P.; Rae, I. Jonathan +2 more
Collisionless space plasma environments are typically characterised by distinct particle populations. Although moments of their velocity distribution functions help in distinguishing different plasma regimes, the distribution functions themselves provide more comprehensive information about the plasma state, especially at times when the distributi…
Boulder Fall Activity in the Jezero Crater, Mars
Vijayan, S.; Mangold, N.; Bhardwaj, Anil +5 more
Jezero crater is the landing site for the Mars 2020 Perseverance rover. We report 63 boulder fall tracks within the crater using High-Resolution Imaging Science Experiment (HiRISE) images. The boulder tracks have both fresh and faded morphologies similar to those reported elsewhere on Mars, but reported for the first time in Jezero crater. We comb…
Evolution of downflows in the transition region above a sunspot over short time-scales
Mathioudakis, M.; Krishna Prasad, S.; Nelson, C. J.
Context. Downflows with potentially super-sonic velocities have been reported to occur in the transition region above many sunspots; however, how these signatures evolve over short time-scales in both spatial and spectral terms is still unknown and requires further research.
Aims: In this article, we investigate the evolution of downflows det…
Continuation of the X-ray monitoring of Sgr A*: the increase in bright flaring rate confirmed
Mossoux, E.; Finociety, B.; Beckers, J. -M. +1 more
Context. The supermassive black hole Sagittarius A* (Sgr A*) is located at the dynamical center of the Milky Way. In a recent study of the X-ray flaring activity from Sgr A* using Chandra, XMM-Newton, and Swift observations from 1999 to 2015, it has been argued that the bright flaring rate has increased from 2014 August 31 while the faint flaring …
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 …