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Where are Mars' Hypothesized Ocean Shorelines? Large Lateral and Topographic Offsets Between Different Versions of Paleoshoreline Maps
Catling, David C.; Dickeson, Zachary I.; Sholes, Steven F. +1 more
Mars' controversial hypothesized ocean shorelines have been found to deviate significantly from an expected equipotential surface. While multiple deformation models have been proposed to explain the wide range of elevations, here we show that the historical locations used in the literature and in these models vary widely. We find that the most com…
Statistical microlensing towards magnified high-redshift star clusters
Dai, Liang
We study light variability of gravitationally magnified high-redshift star clusters induced by a foreground population of microlenses. This arises as the incoherent superposition of light variations from many source stars traversing the random magnification pattern on the source plane. The light curve resembles a scale-invariant, Gaussian process …
Collisions in a gas-rich white dwarf planetary debris disc
Hermes, J. J.; Gänsicke, Boris T.; von Hippel, Ted +5 more
WD 0145+234 is a white dwarf that is accreting metals from a circumstellar disc of planetary material. It has exhibited a substantial and sustained increase in 3-5 $\mu$m flux since 2018. Follow-up Spitzer photometry reveals that emission from the disc had begun to decrease by late 2019. Stochastic brightening events superimposed on the decline in…
The GALAH survey: Chemical homogeneity of the Orion complex
Lewis, Geraint F.; Ting, Yuan-Sen; Buder, Sven +18 more
Due to its proximity, the Orion star forming region is often used as a proxy to study processes related to star formation and to observe young stars in the environment they were born in. With the release of Gaia DR2, the distance measurements to the Orion complex are now good enough that the 3D structure of the complex can be explored. Here we tes…
Evidence for differentiation of the most primitive small bodies
Jorda, L.; Lamy, P.; Colas, F. +41 more
Context. Dynamical models of Solar System evolution have suggested that the so-called P- and D-type volatile-rich asteroids formed in the outer Solar System beyond Neptune's orbit and may be genetically related to the Jupiter Trojans, comets, and small Kuiper belt objects (KBOs). Indeed, the spectral properties of P- and D-type asteroids resemble …
Exploiting White-Light Observations to Improve Estimates of Magnetic Connectivity
Poirier, Nicolas; Kouloumvakos, Athanasios; Rouillard, Alexis P. +7 more
TheSolar Orbiter(SolO) andParker Solar Probemissions have opened up new challenges for the heliospheric scientific community. Their proximity to the Sun and their high quality measurements allow us to investigate, for the first time, potential sources for the solar wind plasma measuredin situ. More accurate estimates of magnetic connectivities fro…
MOMO. IV. The Complete Swift X-Ray and UV/Optical Light Curve and Characteristic Variability of the Blazar OJ 287 during the Last Two Decades
Ciprini, S.; Komossa, S.; Gallo, L. C. +5 more
We have been carrying out a dense monitoring of the blazar OJ 287 with Swift since late 2015 as part of our project MOMO (Multiwavelength Observations and Modeling of OJ 287). This is the densest existing monitoring of OJ 287 involving X-ray/UV data. In this latest publication of a sequence, we characterize the multiwavelength variability of OJ 28…
Kinetic electrostatic waves and their association with current structures in the solar wind
Maksimovic, M.; Bale, S. D.; Chust, T. +21 more
Context. A variety of kinetic electrostatic and electromagnetic waves develop in the solar wind and the relationship between these waves and larger scale structures, such as current sheets and ongoing turbulence, remain a topic of investigation. Similarly, the instabilities producing ion-acoustic waves in the solar wind are still an open question.…
Massive White Dwarfs in Young Star Clusters
Caiazzo, Ilaria; Richer, Harvey B.; Heyl, Jeremy +6 more
We have carried out a search for massive white dwarfs (WDs) in the direction of young open star clusters using the Gaia DR2 database. The aim of this survey was (1) to provide robust data for new and previously known high-mass WDs regarding cluster membership, (2) to highlight WDs previously included in the initial final mass relation (IFMR) that …
Capturing transient plasma flows and jets in the solar corona
Peter, H.; Chitta, L. P.; Solanki, S. K. +8 more
Intensity bursts in ultraviolet (UV) to X-ray wavelengths and plasma jets are typical signatures of magnetic reconnection and the associated impulsive heating of the solar atmospheric plasma. To gain new insights into the process, high-cadence observations are required to capture the rapid response of plasma to magnetic reconnection as well as the…