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WawHelioGlow: A Model of the Heliospheric Backscatter Glow. I. Model Definition
Bzowski, M.; Kubiak, M. A.; Kowalska-Leszczynska, I. +1 more
The helioglow is the fluorescence of interstellar atoms inside the heliosphere, where they are excited by the solar EUV emission. So far, the helioglow of interstellar H and He has been detected. The helioglow features a characteristic distribution in the sky, which can be used to derive the properties of both interstellar neutral (ISN) gas and th…
Understanding the Effects of Systematics in Exoplanetary Atmospheric Retrievals
Kempton, Eliza M. -R.; Ih, Jegug
Retrieval of exoplanetary atmospheric properties from their transmission spectra commonly assumes that the errors in the data are Gaussian and independent. However, non-Gaussian noise can occur due to instrumental or stellar systematics and the merging of discrete data sets. We investigate the effect of correlated noise and constrain the potential…
Why are ELEvoHI CME Arrival Predictions Different if Based on STEREO A or STEREO B Heliospheric Imager Observations?
Temmer, Manuela; Möstl, Christian; Weiss, Andreas J. +9 more
Accurate forecasting of the arrival time and arrival speed of coronal mass ejections (CMEs) is an unsolved problem in space weather research. In this study, a comparison of the predicted arrival times and speeds for each CME based, independently, on the inputs from the two STEREO vantage points is carried out. We perform hindcasts using ELlipse Ev…
A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties
Shen, Juntai; Smith, Martin C.; Li, Zhao-Yu +1 more
In this paper, we collect a sample of stars observed both in LAMOST and Gaia, which have colors implying a temperature hotter than 7000 K. We train a machine-learning algorithm on LAMOST spectroscopic data which has been tagged with stellar classifications and metallicities, and use this machine to construct a catalog of blue horizontal branch sta…
The variable absorption in the X-ray spectrum of GRB 190114C
Perna, Rosalba; Campana, Sergio; Lazzati, Davide +2 more
Gamma-ray burst (GRB) 190114C was a bright burst that occurred in the local Universe (z = 0.425). It was the first GRB ever detected at teraelectronvolt (TeV) energies, and this was thanks to MAGIC. We characterize the ambient medium properties of the host galaxy through the study of the absorbing X-ray column density. Using a combination of Swift…
Retrieval of the water ice column and physical properties of water-ice clouds in the martian atmosphere using the OMEGA imaging spectrometer
Bellucci, G.; Forget, F.; Oliva, F. +8 more
Using spectral images recorded by the OMEGA instrument on Mars Express (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité), we are able to derive physical properties of aerosols in water-ice clouds on Mars for a distribution of pixels over an observed cloud formation. These properties, mean effective radius, reff, and op…
Towards a fully consistent Milky Way disk model. IV. The impact of Gaia DR2 and APOGEE
Just, A.; Sysoliatina, K.
Aims: We present an updated version of the semi-analytic Just-Jahrei (JJ) model of the Galactic disk and constrain its parameters in the Solar neighbourhood.
Methods: The new features of the JJ model include a simple two-component gaseous disk, a star-formation rate (SFR) function of the thick disk that has been extended in time, and a c…
Characterizing the magnetic fields of nearby molecular clouds using submillimeter polarization observations
Soler, J. D.; Fissel, L. M.; Li, Z. -Y. +3 more
Of all the factors that influence star formation, magnetic fields are perhaps the least well understood. The goal of this paper is to characterize the 3D magnetic field properties of nearby molecular clouds through various methods of statistically analysing maps of polarized dust emission. Our study focuses on nine clouds, with data taken from the…
An Extremely Elongated Cloud Over Arsia Mons Volcano on Mars: I. Life Cycle
Gondet, B.; Jaumann, R.; Hueso, R. +12 more
We report a previously unnoticed annually repeating phenomenon consisting of the daily formation of an extremely elongated cloud extending as far as 1,800 km westward from Arsia Mons. It takes place in the solar longitude (Ls) range of ∼220°-320°, around the Southern solstice. We study this Arsia Mons Elongated Cloud (AMEC) using images from diffe…
The Cepheid Distance to the Narrow-line Seyfert 1 Galaxy NGC 4051
Ferrarese, L.; Vestergaard, M.; Peterson, B. M. +15 more
We derive a distance of D = 16.6 ± 0.3 Mpc (µ = 31.10 ± 0.04 mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid period-luminosity relations and new Hubble Space Telescope multiband imaging. We identify 419 Cepheid candidates and estimate the distance at both optical and near-infrared wavelengths using subsamples of…