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On the partial eruption of a bifurcated solar filament structure
Liu, Jiajia; Uddin, Wahab; Chandra, Ramesh +4 more
The partial eruption of a filament channel with bifurcated substructures is investigated using data sets obtained from both ground-based and space-borne facilities. Small-scale flux reconnection/cancellation events in the region triggered the pile-up of ambient magnetic field, observed as bright extreme ultraviolet (EUV) loops in close proximity t…
Testing the chemical homogeneity of chemically tagged dissolved birth clusters
Bovy, Jo; Cheng, Chloe M.; Price-Jones, Natalie
Chemically tagging stars back to common formation sites in the Milky Way and establishing a high level of chemical homogeneity in these chemically tagged birth clusters is crucial for understanding the chemical and dynamical history of the Galactic disc. We constrain the intrinsic abundance scatter in 17 newly chemically tagged dissolved birth clu…
The Decline and Fall of the Youngest Planetary Nebula
Balick, Bruce; Guerrero, Martín A.; Ramos-Larios, Gerardo
The Stingray Nebula, a.k.a. Hen3-1357, appeared for the first time in 1990 when bright nebular lines and radio emission that had not been observed before were unexpectedly discovered. In the ensuing years, the nebula faded precipitously. We report changes in shape and large decreases in its nebular emission-line fluxes based on well-calibrated ima…
NGC 6611 601: a hot pre-main-sequence spectroscopic binary containing a centrifugal magnetosphere host star
Wade, G. A.; Shultz, M. E.; Alecian, E. +5 more
W 601 (NGC 6611 601) is one of the handful of known magnetic Herbig Ae/Be stars. We report the analysis of a large data set of high-resolution spectropolarimetry. The star is a previously unreported spectroscopic binary, consisting of two B2 stars with a mass ratio of 1.8, masses of 12 and 6.2 M⊙, in an eccentric 110-d orbit. The magnet…
Explosive nucleosynthesis of a metal-deficient star as the source of a distinct odd-even effect in the solar twin HIP 11915
Meléndez, Jorge; Karakas, Amanda I.; Asplund, Martin +2 more
The abundance patterns observed in the Sun and in metal-poor stars show a clear odd-even effect. An important question is whether the odd-even effect in solar-metallicity stars is similar to the Sun, or if there are variations that can tell us about different chemical enrichment histories. In this work, we report for the first time observational e…
Enhanced Super-Rotation Before and During the 2018 Martian Global Dust Storm
Fedorova, Anna A.; Holmes, James A.; Lewis, Stephen R. +3 more
Super-rotation affects—and is affected by—the distribution of dust in the martian atmosphere. We modeled this interaction during the 2018 global dust storm (GDS) of Mars Year 34 using data assimilation. Super-rotation increased by a factor of two at the peak of the GDS, as compared to the same period in the previous year which did not feature a GD…
Machine Learning the Sixth Dimension: Stellar Radial Velocities from 5D Phase-space Correlations
Lisanti, Mariangela; Cohen, Timothy; Dropulic, Adriana +3 more
The Gaia satellite will observe the positions and velocities of over a billion Milky Way stars. In the early data releases, the majority of observed stars do not have complete 6D phase-space information. In this Letter, we demonstrate the ability to infer the missing line-of-sight velocities until more spectroscopic observations become available. …
New X-ray detections of known Wolf-Rayet stars
Nazé, Yaël; Gosset, Eric; Marechal, Quentin
Using XMM-Newton, we undertook a dedicated project to search for X-ray bright wind-wind collisions in 18 WR+OB systems. We complemented these observations with Swift and Chandra data sets, allowing for the study of two additional systems. We also improved the ephemerides, for these systems displaying photometric changes, using TESS, Kepler, and AS…
Long-term X-ray evolution of SDSS J134244.4+053056.1. A more than 18 year-old, long-lived IMBH-TDE candidate
Shu, X. W.; Wang, T. G.; He, J. S. +5 more
SDSS J134244.4+053056 is a tidal disruption event candidate with strong temporal coronal line emitters and a long fading, mid-infrared dust echo. We present detailed analyses of X-ray emission from a Swift/XRT observation in 2009 and the most recent XMM-Newton/pn observation in 2020. The two spectra can be modeled with hard and soft components. Wh…
AzTEC survey of the central molecular zone: data reduction, analysis, and preliminary results
Zavala, Jorge A.; Gutermuth, Robert A.; Yun, Min S. +14 more
We present a large-scale survey of the central molecular zone (CMZ) of our Galaxy, as well as a monitoring program of Sgr A*, with the AzTEC/Large Millimeter Telescope in the 1.1 mm continuum. Our 1.1 mm map covers the main body of the CMZ over a field of 1.6 × 1.1 deg2 with an angular resolution of 10.5 arcsec and a depth of 15 mJy bea…