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On the ion-neutral coupling in cometary comae
Eriksson, Anders I.; Vigren, Erik
In a cometary coma, the ion-neutral decoupling distance, sometimes referred to as the ion exobase or collisionopause, can be defined as the cometocentric distance, rin, where ions, initially moving with the neutral outgassing speed, have a probability of 1/e of not colliding with neutrals on their subsequent journey radially outwards. W…
Implication of kinetic Alfvén waves to magnetic field turbulence spectra: Earth's magnetosheath
Khodachenko, M. L.; Kumar, S.; Echim, M. +5 more
In the present paper, we investigate the power-law behaviour of the magnetic field spectra in the Earth's magnetosheath region using Cluster spacecraft data under solar minimum condition. The power spectral density of the magnetic field data and spectral slopes at various frequencies are analysed. Propagation angle,
The Independent Discovery of Planet Candidates around Low-mass Stars and Astrophysical False Positives from the First Two TESS Sectors
Cloutier, Ryan
Continuous data releases throughout the Transiting Exoplanet Survey Satellite (TESS) primary mission will provide unique opportunities for the exoplanet community at large to contribute to maximizing TESS's scientific return via the discovery and validation of transiting planets. This paper introduces our independent pipeline for the detection of …
All-sky angular power spectra from cleaned WISE×SuperCOSMOS galaxy number counts
Balaguera-Antolínez, A.; Costa-Duarte, M. V.; Xavier, H. S. +1 more
Aiming to extract cosmological information from linear scales of the WISE×SuperCOSMOS photometric redshift catalog, we perform a characterization of the systematic effects associated with stellar content, evidencing the presence of contamination and obscuration. We create an integrated model for these effects (which together we call "usurper conta…
A Search for Pulsed Very High-energy Gamma-Rays from 13 Young Pulsars in Archival VERITAS Data
Archer, A.; Benbow, W.; Bird, R. +58 more
We conduct a search for periodic emission in the very high-energy (VHE) gamma-ray band (E > 100 GeV) from a total of 13 pulsars in an archival VERITAS data set with a total exposure of over 450 hr. The set of pulsars includes many of the brightest young gamma-ray pulsars visible in the Northern Hemisphere. The data analysis resulted in nondetec…
The exceptional X-ray evolution of SN 1996cr in high resolution
Bauer, F. E.; Brandt, W. N.; Quirola-Vásquez, J. +4 more
We present X-ray spectra spanning 18 yr of evolution for SN 1996cr, one of the five nearest SNe detected in the modern era. Chandra HETG exposures in 2000, 2004, and 2009 allow us to resolve spectrally the velocity profiles of Ne, Mg, Si, S, and Fe emission lines and monitor their evolution as tracers of the ejecta-circumstellar medium interaction…
Towards observing reverberating and superefficient pulsar wind nebulae
Coti Zelati, Francesco; Torres, Diego F.; Lin, Tingting
In a recent work, we numerically studied the radiative properties of the reverberation phase of pulsar wind nebulae (PWNe), i.e. when the reverse shock created by the supernova explosion travels back towards the pulsar, compressing the wind bubble. We focused on several well-characterized PWNe and used them as examples for introducing the concept …
Gamma-Ray Polarimetry: A New Window for the Nonthermal Universe
Ilie, Cosmin
Over the past few decades, impressive progress has been made in the field of photon polarimetry, especially in the hard X-ray and soft gamma-ray energy regime. Measurements of the linear degree of polarization for some of the most energetic astrophysical sources, such as gamma-ray bursts (GRBs) or blazars, are now possible, at energies below the p…
Search for water outgassing of (1) Ceres near perihelion
Russell, C. T.; Mousis, O.; Vernazza, P. +13 more
Context. (1) Ceres is the largest body in the main asteroid belt and one of the most intriguing objects in the solar system, in part because of the discovery of water outgassing by the Herschel Space Observatory (HSO) and its still-debated origin. Ceres was the target of NASA's Dawn spacecraft for 3.5 yr, which achieved a detailed characterization…
Nonequilibrium Ionization Effects on Coronal Plasma Diagnostics and Elemental Abundance Measurements
Landi, Enrico; Shi, Tong; Manchester, Ward, IV
Plasma diagnostics and elemental abundance measurements are crucial to help us understand the formation and dynamics of the solar wind. Here we use a theoretical solar wind model to study the effect of nonequilibrium ionization (NEI) on plasma diagnostic techniques applied to line intensities emitted by the fast solar wind. We find that NEI almost…