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Discovery of New Coronal Lines at 2.843 and 2.853 µm
DeLuca, Edward E.; Judge, Philip G.; Samra, Jenna E. +1 more
Two new emission features were observed during the 2017 August 21 total solar eclipse by a novel spectrometer, the Airborne Infrared Spectrometer (AIR-Spec), flown at 14.3 km altitude aboard the NCAR Gulfstream-V aircraft. We derive wavelengths in air of 2.8427 ± 0.00009 µm and 2.8529 ± 0.00008 µm. One of these lines belongs to the 3{{…
Search for trans-iron elements in hot, helium-rich white dwarfs with the HST Cosmic Origins Spectrograph
Hoyer, D.; Rauch, T.; Werner, K. +1 more
The metal abundances in the atmospheres of hot white dwarfs (WDs) entering the cooling sequence are determined by the preceding Asymptotic Giant Branch (AGB) evolutionary phase and, subsequently, by the onset of gravitational settling and radiative levitation. In this paper, we investigate three hot He-rich WDs, which are believed to result from a…
The Oxygen Ion Circulation in The Outer Terrestrial Magnetosphere and Its Dependence on Geomagnetic Activity
Nilsson, H.; Slapak, R.
We have quantified the O+ transports in the plasma sheet and lobes (-20 < XGSM<-10RE) and their dependencies on geomagnetic activity, Kp, using Cluster data. We found that they have similar behavior as the polar region O+ outflow as well as the O+ fluxes in the plasma mantle and high-lat…
WEIRD: Wide-orbit Exoplanet Search with InfraRed Direct Imaging
Gagné, Jonathan; Albert, Loïc; Doyon, René +9 more
We report results from the Wide-orbit Exoplanet search with InfraRed Direct imaging, or WEIRD, a survey designed to search for Jupiter-like companions on very wide orbits (1000-5000 au) around young stars (<120 Myr) that are known members of moving groups in the solar neighborhood (<70 pc). Companions that share the same age, distance, and m…
Possible systematics in the VLBI catalogs as seen from Gaia
Liu, N.; Zhu, Z.; Liu, J. -C.
Aims: In order to investigate the systematic errors in the very long baseline interferometry (VLBI) positions of extragalactic sources (quasars) and the global differences between Gaia and VLBI catalogs, we use the first data release of Gaia (Gaia DR1) quasar positions as the reference and study the positional offsets of the second realizatio…
z ∼ 2.5-3 Ionizers in the GOODS-N Field
Barger, A. J.; Cowie, L. L.; Oesch, P. +4 more
We use deep F275W imaging from the Hubble Deep UV Legacy Survey (HDUV) and G280 grism spectroscopy from the Hubble Space Telescope/WFC3, along with new and archival optical spectra from Keck/DEIMOS, to search for candidate ionizing sources in the GOODS-N field at z ∼ 2.5-3. Spectroscopic identification of our UV-selected sources are 99% complete t…
Dependence of galaxy clustering on UV luminosity and stellar mass at z ∼ 4-7
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +6 more
We investigate the dependence of galaxy clustering at z ∼ 4-7 on UV luminosity and stellar mass. Our sample consists of ∼10 000 Lyman-break galaxies in the eXtreme Deep Field (XDF) and Cosmic Assembly Near-infrared Deep Extragalatic Legacy Survey (CANDELS) fields. As part of our analysis, the M⋆-MUV relation is estimated for …
Gradual Streamer Expansions and the Relationship between Blobs and Inflows
Hess, P.; Wang, Y. -M.
Coronal helmet streamers show a continual tendency to expand outward and pinch off, giving rise to flux ropes that are observed in white light as “blobs” propagating outward along the heliospheric current/plasma sheet. The blobs form within the r ∼ 2-6 R ⊙ heliocentric range of the Large Angle and Spectrometric Coronagraph (LASCO) C2 in…
E and B families of the Stokes parameters in the polarized synchrotron and thermal dust foregrounds
Liu, Hao; Naselsky, Pavel; Creswell, James
Better understanding of Galactic foregrounds is one of the main obstacles to detection of primordial gravitational waves through measurement of the B mode in the polarized microwave sky. We generalize the method proposed in [1] and decompose the polarization signals into the E and B families directly in the domain of the Stokes Q, U parameters as …
Plasmaspheric Plumes and EMIC Rising Tone Emissions
Dandouras, I.; Santolík, O.; Cornilleau-Wehrlin, N. +4 more
Due to its polar orbit Cluster spacecraft crossed plasmaspheric plumes out of the magnetic equatorial plane. We study the occurrence of broadband, narrowband, and rising tone emissions in the plume vicinity, below the local proton gyrofrequency. Based on a database of 935 Cluster plumes crossings, reduced to 189 unique plumes, we find that broadba…