Search Publications
Geologic Context of the Bright MARSIS Reflectors in Ultimi Scopuli, South Polar Layered Deposits, Mars
Landis, M. E.; Whitten, J. L.
Radar-bright basal reflectors have been detected below the South Polar Layered Deposits (SPLD), using Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) data and have an exciting but controversial interpretation: liquid water from subglacial lakes. We mapped the surface of the SPLD immediately above and surrounding the putative la…
Asymmetric Interaction of a Solar Wind Reconnecting Current Sheet and Its Magnetic Hole With Earth's Bow Shock and Magnetopause
Liemohn, Michael W.; Karlsson, Tomas; Liu, Terry Z. +3 more
We report results of our multi-spacecraft analysis of a solar wind reconnecting current sheet (RCS) and its solar wind magnetic hole (SWMH) observed on November 20, 2018. In the solar wind, the normal vector to the current sheet plane makes an angle of 32° with the Sun-Earth line. A combination of tilted current sheet plane and foreshock effects c…
Shapes of galaxies hosting radio-loud AGNs with z ≤ 1
van der Wel, A.; Zheng, X. C.; Röttgering, H. J. A. +1 more
Links between the properties of radio-loud active galactic nuclei (RLAGNs) and the morphology of their hosts may provide important clues for our understanding of how RLAGNs are triggered. In this work, focusing on passive galaxies, we study the shape of the hosts of RLAGNs selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (…
SQUAB—I: The First Release of Strange QUasar Candidates With ABnormal Astrometric Characteristics From Gaia EDR3 and SDSS
Zheng, Zhen-Ya; Ji, Xiang; An, Tao +5 more
Given their extremely large distances and small apparent sizes, quasars are generally considered as objects with near-zero parallax and proper motion. However, some special quasars may have abnormal astrometric characteristics, such as quasar pairs, lensed quasars, AGNs with bright parsec-scale optical jets, which are scientifically interesting ob…
Detecting the Oscillation and Propagation of the Nascent Dynamic Solar Wind Structure at 2.6 Solar Radii Using Very Long Baseline Interferometry Radio Telescopes
He, Jiansen; Venturi, Tiziana; Zhang, Peijin +30 more
Probing the solar corona is crucial to study the coronal heating and solar wind acceleration. However, the transient and inhomogeneous solar wind flows carry large-amplitude inherent Alfvén waves and turbulence, which make detection more difficult. We report the oscillation and propagation of the solar wind at 2.6 solar radii (Rs) by observation o…
Does the Lockstep Growth between Black Holes and Bulges Create Their Mass Relation?
Papovich, Casey; Yang, Guang; Brandt, W. N. +7 more
Recent studies have revealed a strong relation between the sample-averaged black hole (BH) accretion rate (BHAR) and star formation rate (SFR) among bulge-dominated galaxies-i.e., "lockstep" BH-bulge growth-in the distant universe. This relation might be closely connected to the BH-bulge mass correlation observed in the local universe. To further …
The First High-contrast Images of X-Ray Binaries: Detection of Candidate Companions in the γ Cas Analog RX J1744.7-2713
Fabian, A. C.; Gandhi, P.; Mawet, D. +17 more
X-ray binaries provide exceptional laboratories for understanding the physics of matter under the most extreme conditions. Until recently, there were few, if any, observational constraints on the circumbinary environments of X-ray binaries at ~100-5000 au scales. It remains unclear how the accretion onto the compact objects or the explosions givin…
The impact of the presence of water ice on the analysis of debris disk observations
Wolf, S.; Stuber, T. A.
Context. The analysis of debris disk observations is often based on the assumption of a dust phase composed of compact spherical grains consisting of astronomical silicate. Instead, observations indicate the existence of water ice in debris disks.
Aims: We quantify the impact of water ice as a potential grain constituent in debris disks on th…
Selection of the Main Control Parameters for the Dst Index Prediction Model Based on a Layer-wise Relevance Propagation Method
Zhang, J.; Wang, Z.; Li, Y. Y. +8 more
The prediction of the Dst index is an important subject in space weather. It has significant progress with the prevalent applications of neural networks. The selection of input parameters is critical for the prediction model of the Dst index or other space-weather models. In this study, we perform a layer-wise relevance propagation (LRP) method to…
Planet Patrol: Vetting Transiting Exoplanet Candidates with Citizen Science
Kostov, Veselin B.; Kuchner, Marc J.; Brande, Jonathan +15 more
NASA's TESS mission yields light curves for tens of millions of stars spread across the entire sky, a data set that will be a challenge to fully exploit without help from citizen scientists. To address this, we launched a new citizen science project, called "Planet Patrol", designed to analyze TESS data on exoplanet and eclipsing binary candidates…