Search Publications
Direct Observation of a Large-scale CME Flux Rope Event Arising from an Unwinding Coronal Jet
Yang, Jiayan; Hong, Junchao; Duan, Yadan +2 more
Coronal mass ejections (CMEs) and coronal jets are two types of common solar eruptive phenomena, which often independently happen at different spatial scales. In this work, we present a stereoscopic observation of a large-scale CME flux rope arising from an unwinding blowout jet in a multipolar complex magnetic system. Based on a multiband observa…
Transition from coherent cores to surrounding cloud in L1688
Caselli, Paola; Rosolowsky, Erik; Kirk, Helen +8 more
Context. Stars form in cold dense cores showing subsonic velocity dispersions. The parental molecular clouds display higher temperatures and supersonic velocity dispersions. The transition from core to cloud has been observed in velocity dispersion, but temperature and abundance variations are unknown.
Aims: We aim to measure the temperature …
Radio Spectral Imaging of an M8.4 Eruptive Solar Flare: Possible Evidence of a Termination Shock
Krucker, Säm; Chen, Bin; Yu, Sijie +2 more
Solar flare termination shocks have been suggested as one of the viable mechanisms for accelerating electrons and ions to high energies. Observational evidence of such shocks, however, remains rare. Using radio dynamic spectroscopic imaging of a long-duration C1.9 flare obtained by the Karl G. Jansky Very Large Array (VLA), Chen et al. suggested t…
Blue supergiants as tests for stellar physics
Meynet, Georges; Saio, Hideyuki; Georgy, Cyril
Context. Massive star evolution is still poorly understood, and observational tests are required to discriminate between different implementations of physical phenomena in stellar evolution codes.
Aims: By confronting stellar evolution models with observed properties of blue supergiants, such as pulsations, the chemical composition, and posit…
The GADOT Galaxy Survey: Dense Gas and Feedback in Herschel-selected Starburst Galaxies at Redshifts 2 to 6
Neri, Roberto; Cooray, Asantha; Riechers, Dominik A. +1 more
We report the detection of 23 OH+ 1 → 0 absorption, emission, or P-Cygni-shaped lines and CO(J = 9→8) emission lines in 18 Herschel-selected z = 2-6 starburst galaxies with the Atacama Large Millimeter/submillimeter Array and the NOrthern Extended Millimeter Array, taken as part of the Gas And Dust Over cosmic Time Galaxy Survey. We fin…
Evolutionary view through the starless cores in Taurus. Deuteration in TMC 1-C and TMC 1-CP
Ward-Thompson, D.; Kramer, C.; Fuente, A. +11 more
Context. The chemical and physical evolution of starless and pre-stellar cores are of paramount importance to understanding the process of star formation. The Taurus Molecular Cloud cores TMC 1-C and TMC 1-CP share similar initial conditions and provide an excellent opportunity to understand the evolution of the pre-stellar core phase.
Aims: …
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…