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Reconstructing the high-energy irradiation of the evaporating hot Jupiter HD 209458b
Wheatley, Peter J.; Louden, Tom; Briggs, Kevin
The atmosphere of the exoplanet HD 209458b is undergoing sustained mass loss, believed to be caused by X-ray and extreme-ultraviolet (XUV) irradiation from its star. The majority of this flux is not directly observable due to interstellar absorption, but is required in order to correctly model the photoevaporation of the planet and photoionization…
Inferring the three-dimensional distribution of dust in the Galaxy with a non-parametric method . Preparing for Gaia
Bailer-Jones, C. A. L.; Fouesneau, M.; Rezaei Kh., S. +1 more
We present a non-parametric model for inferring the three-dimensional (3D) distribution of dust density in the Milky Way. Our approach uses the extinction measured towards stars at different locations in the Galaxy at approximately known distances. Each extinction measurement is proportional to the integrated dust density along its line of sight (…
Revealing structure and evolution within the corona of the Seyfert galaxy I Zw 1
Brandt, W. N.; Kriss, G. A.; Costantini, E. +3 more
X-ray spectral timing analysis is presented of XMM-Newton observations of the narrow-line Seyfert 1 galaxy I Zwicky 1 taken in 2015 January. After exploring the effect of background flaring on timing analyses, X-ray time lags between the reflection-dominated 0.3-1.0 keV energy and continuum-dominated 1.0-4.0 keV band are measured, indicative of re…
From Planck Data to Planck Era: Observational Tests of Holographic Cosmology
Afshordi, Niayesh; Corianò, Claudio; Delle Rose, Luigi +2 more
We test a class of holographic models for the very early Universe against cosmological observations and find that they are competitive to the standard cold dark matter model with a cosmological constant (Λ CDM ) of cosmology. These models are based on three-dimensional perturbative superrenormalizable quantum field theory (QFT), and, while they pr…
Sulfur dioxide in the Venus Atmosphere: II. Spatial and temporal variability
Vandaele, A. C.; Robert, S.; Montmessin, F. +18 more
The vertical distribution of sulfur species in the Venus atmosphere has been investigated and discussed in Part I of this series of papers dealing with the variability of SO2 on Venus. In this second part, we focus our attention on the spatial (horizontal) and temporal variability exhibited by SO2. Appropriate data sets - SPI…
Line Ratios for Solar Wind Charge Exchange with Comets
Gu, L.; Kaastra, J.; Shelton, R. L. +4 more
Charge exchange (CX) has emerged in X-ray emission modeling as a significant process that must be considered in many astrophysical environments—particularly comets. Comets host an interaction between solar wind ions and cometary neutrals to promote solar wind charge exchange (SWCX). X-ray observatories provide astronomers and astrophysicists with …
Interaction of the solar wind with comets: a Rosetta perspective
Glassmeier, Karl-Heinz
The Rosetta mission provides an unprecedented possibility to study the interaction of comets with the solar wind. As the spacecraft accompanies comet 67P/Churyumov-Gerasimenko from its very low-activity stage through its perihelion phase, the physics of mass loading is witnessed for various activity levels of the nucleus. While observations at oth…
High-resolution Statistics of Solar Wind Turbulence at Kinetic Scales Using the Magnetospheric Multiscale Mission
Russell, C. T.; Fuselier, S. A.; Torbert, R. B. +10 more
Using data from the Magnetospheric Multiscale (MMS) and Cluster missions obtained in the solar wind, we examine second-order and fourth-order structure functions at varying spatial lags normalized to ion inertial scales. The analysis includes direct two-spacecraft results and single-spacecraft results employing the familiar Taylor frozen-in flow a…
ALMA Pinpoints a Strong Overdensity of U/LIRGs in the Massive Cluster XCS J2215 at z = 1.46
Smail, Ian; Hilton, Matt; Swinbank, A. M. +3 more
We surveyed the core regions of the z = 1.46 cluster XCS J2215.9-1738 with the Atacama Large Millimeter Array (ALMA) and the MUSE-GALACSI spectrograph on the Very Large Telescope (VLT). We obtained high spatial resolution observations with ALMA of the 1.2 mm dust continuum and molecular gas emission in the central regions of the cluster. These obs…
Do joint CMB and HST data support a scale invariant spectrum?
Benetti, Micol; Graef, Leila L.; Alcaniz, Jailson S.
We combine current measurements of the local expansion rate, H0, and Big Bang Nucleosynthesis (BBN) estimates of helium abundance with the latest cosmic microwave background (CMB) data from the Planck Collaboration to discuss the observational viability of the scale invariant Harrison-Zeldovch-Peebles (HZP) spectrum. We also analyze som…