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An Observational Study of a "Rosetta Stone" Solar Eruption
Mason, E. I.; Antiochos, Spiro K.; Vourlidas, Angelos
This Letter reports observations of an event that connects all major classes of solar eruptions: those that erupt fully into the heliosphere versus those that fail and are confined to the Sun, and those that eject new flux into the heliosphere, in the form of a flux rope, versus those that eject only new plasma in the form of a jet. The event orig…
Variable stars in Local Group galaxies - V. The fast and early evolution of the low-mass Eridanus II dSph galaxy
Zenteno, A.; Walker, A. R.; Salvadori, S. +18 more
We present a detailed study of the variable star population of Eridanus II (Eri II), an ultra-faint dwarf galaxy that lies close to the Milky Way virial radius. We analyse multi-epoch g, r, i ground-based data from Goodman and the Dark Energy Camera, plus F475W, F606W, F814W space data from the Advanced Camera for Surveys. We report the detection …
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy - I. HH 529 II and III
Henney, W. J.; Méndez-Delgado, J. E.; Arellano-Córdova, K. Z. +3 more
We present the analysis of physical conditions, chemical composition, and kinematic properties of two bow shocks - HH 529 II and HH 529 III - of the fully photoionized Herbig-Haro object HH 529 in the Orion Nebula. The data were obtained with the Ultraviolet and Visual Echelle Spectrograph at the 8.2m Very Large Telescope and 20 yr of Hubble Space…
Periodic Bedrock Ridges at the ExoMars 2022 Landing Site: Evidence for a Changing Wind Regime
Pajola, M.; Tirsch, D.; Silvestro, S. +11 more
Wind formed features are abundant in Oxia Planum (Mars), the landing site of the 2022 ExoMars mission, which shows geological evidence for a past wet environment. Studies of aeolian bedforms at the landing site were focused on assessing the risk for rover trafficability, however their potential in recording climatic fluctuations has not been explo…
Composite bulges - II. Classical bulges and nuclear discs in barred galaxies: the contrasting cases of NGC 4608 and NGC 4643
Beckman, John E.; Bender, Ralf; Drory, Niv +14 more
We present detailed morphological, photometric, and stellar-kinematic analyses of the central regions of two massive, early-type barred galaxies with nearly identical large-scale morphologies. Both have large, strong bars with prominent inner photometric excesses that we associate with boxy/peanut-shaped (B/P) bulges; the latter constitute ∼30 per…
The magnetic field across the molecular warped disk of Centaurus A
Lopez-Rodriguez, Enrique
Magnetic fields are amplified as a consequence of galaxy formation and turbulence-driven dynamos. Galaxy mergers can potentially amplify the magnetic fields from their progenitors, making the magnetic fields dynamically important. However, the effect of mergers on magnetic fields is still poorly understood. We use thermal polarized emission observ…
The Dark World: A Tale of WASP-43b in Reflected Light with HST WFC3/UVIS
Fortney, Jonathan J.; Stevenson, Kevin B.; Mayorga, L. C. +14 more
Optical reflected light eclipse observations provide a direct probe of exoplanet scattering properties, such as from aerosols. We present here the photometric reflected light observations of WASP-43b using the Hubble Space Telescope (HST) WFC3/UVIS instrument with the F350LP filter (346-822 nm) encompassing the entire optical band. This is the fir…
XMMU J050722.1-684758: discovery of a new Be X-ray binary pulsar likely associated with the supernova remnant MCSNR J0507-6847
Haberl, F.; Udalski, A.; Filipović, M. D. +5 more
We report the discovery of a new high-mass X-ray binary pulsar, XMMU J050722.1-684758, possibly associated with the supernova remnant (SNR) MCSNR J0507-6847 in the Large Magellanic Cloud, using XMM-NewtonX-ray observations. Pulsations with a periodicity of 570 s are discovered from the Be X-ray binary XMMU J050722.1-684758 confirming its nature as…
The Anatomy of an Unusual Edge-on Protoplanetary Disk. I. Dust Settling in a Cold Disk
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +7 more
As the earliest stage of planet formation, massive, optically thick, and gas-rich protoplanetary disks provide key insights into the physics of star and planet formation. When viewed edge-on, high-resolution images offer a unique opportunity to study both the radial and vertical structures of these disks and relate this to vertical settling, radia…
Masses of White Dwarf Binary Companions to Type Ia Supernovae Measured from Runaway Velocities
Hermes, J. J.; Shen, Ken J.; Chandra, Vedant +1 more
The recently proposed "dynamically driven double-degenerate double-detonation" (D6) scenario posits that Type Ia supernovae (SNe) may occur during dynamically unstable mass transfer between two white dwarfs (WDs) in a binary. This scenario predicts that the donor WD may then survive the explosion and be released as a hypervelocity runaw…