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Hydroxylated Mg-rich Amorphous Silicates: A New Component of the 3.2 µm Absorption Band of Comet 67P/Churyumov-Gerasimenko
Carlson, R. W.; Kappel, D.; Pommerol, A. +13 more
The VIRTIS imaging spectrometer on board Rosetta has shown that the nucleus surface of comet 67P/Churyumov-Gerasimenko (67P/CG) is characterized by a broad absorption band at around 3.2 µm. The feature is ubiquitous across the surface and its attribution to (a) specific material(s) has been challenging. In the present Letter, we report an ex…
Propagation properties of foreshock cavitons: Cluster observations
Zhang, Hui; Fu, SuiYan; Sun, WeiJie +12 more
ALMA observations of CS in NGC 1068: chemistry and excitation
Saintonge, A.; Krips, M.; Kohno, K. +14 more
We present results from Atacama Large Millimeter/submillimeter Array (ALMA) observations of CS from the nearby galaxy NGC 1068 (~14 Mpc). This Seyfert 2 barred galaxy possesses a circumnuclear disc (CND, r ~ 200 pc) and a starburst ring (SB ring, r ~ 1.3 kpc). These high-resolution maps (~0.5 arcsec, ~35 pc) allow us to analyse specific sub-region…
High-resolution Spectral Discriminants of Ocean Loss for M-dwarf Terrestrial Exoplanets
Lustig-Yaeger, Jacob; Meadows, Victoria S.; Leung, Michaela
In the near future, extremely large ground-based telescopes may conduct some of the first searches for life beyond the solar system. High spectral resolution observations of reflected light from nearby exoplanetary atmospheres could be used to search for the biosignature oxygen. However, while Earth's abundant O2 is photosynthetic, earl…
Li abundances for solar twins in the open cluster M67
Carlos, Marília; Meléndez, Jorge; do Nascimento, José-Dias +1 more
We determine lithium (Li) abundances for solar twins in the M67 open cluster to add valuable information about the correlation between Li depletion and stellar age and, then, better understand stellar structure and evolution. We use high resolution and good signal-to-noise ratio spectra to characterize Li depletion in three solar twins from M67, u…
Neon Abundances of B Stars in the Solar Neighborhood
Zhao, Gang; Alexeeva, Sofya; Sadakane, Kozo +4 more
We constructed a comprehensive model atom for Ne I-Ne II using the most-up-to-date atomic data available and evaluated the nonlocal thermodynamic equilibrium (NLTE) line formation for Ne I and Ne II in classical 1D models representing the atmospheres of B-type stars. We find that the large NLTE strengthening of the Ne I lines corresponding to the …
Hi-C 2.1 Observations of Small-scale Miniature-filament-eruption-like Cool Ejections in an Active Region Plage
Winebarger, Amy R.; Panesar, Navdeep K.; Moore, Ronald L. +5 more
We examine 172 Å ultra-high-resolution images of a solar plage region from the High-Resolution Coronal Imager, version 2.1 (Hi-C 2.1, or Hi-C) rocket flight of 2018 May 29. Over its five minute flight, Hi-C resolved a plethora of small-scale dynamic features that appear near noise level in concurrent Solar Dynamics Observatory (SDO) Atmospheric Im…
New luminous blue variable candidates in the NGC 247 galaxy
Vinokurov, A.; Solovyeva, Y.; Atapin, K. +6 more
We search for luminous blue variable (LBV) stars in galaxies outside the Local Group. Here we present a study of two bright Hα sources in the NGC 247 galaxy. Object j004703.27-204708.4 (MV = -9.08 ± 0.15 mag) shows the spectral lines typical for well-studied LBV stars: broad and bright emission lines of hydrogen and helium He I with P C…
A Study of the Observational Properties of Coronal Mass Ejection Flux Ropes near the Sun
Gopalswamy, N.; Sindhuja, G.
We present the observational properties of coronal mass ejection (CME) flux ropes (FRs) near the Sun based on a set of 35 events from solar cycle 24 (2010-2017). We derived the CME FR properties using the Flux Rope from Eruption Data technique. According to this technique, the geometrical properties are obtained from a flux-rope fit to CMEs and th…
Photometric flaring fraction of M dwarf stars from the SkyMapper Southern Survey
Wolf, Christian; Onken, Christopher A.; Chang, Seo-Won
We present our search for flares from M dwarf stars in the SkyMapper Southern Survey DR1, which covers nearly the full Southern hemisphere with six-filter sequences that are repeatedly observed in the passbands uvgriz. This allows us to identify bona fide flares in single-epoch observations on time-scales of less than four minutes. Using a correla…