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The radiative forcing variability caused by the changes of the upper cloud vertical structure in the Venus mesosphere
Pätzold, M.; Piccioni, G.; Ignatiev, N. I. +3 more
The upper cloud layer of Venus is a key factor affecting radiative energy balance of the mesosphere. Observations of the temperature and the cloud top structure by Venus Express revealed their strong variability with latitude. We used the 1-D radiative transfer model to study the dependence of the radiative forcing on the cloud top structure. The …
Warm gas in and around simulated galaxy clusters as probed by absorption lines
Putman, M. E.; Emerick, A.; Bryan, G.
Understanding gas flows into and out of the most massive dark matter structures in our Universe, galaxy clusters, is fundamental to understanding their evolution. Gas in clusters is well studied in the hot (> 106 K) and cold (< 104 K) regimes, but the warm gas component (104-106 K) is poorly constr…
Multiwavelength modelling the SED of supersoft X-ray sources I. The method and examples
Skopal, A.
Radiation of supersoft X-ray sources (SSS) dominates both the supersof X-ray and the far-UV domain. A fraction of their radiation can be reprocessed into the thermal nebular emission, seen in the spectrum from the near-UV to longer wavelengths. In the case of symbiotic X-ray binaries (SyXBs) a strong contribution from their cool giants is indicate…
Stratospheric benzene and hydrocarbon aerosols detected in Saturn's auroral regions
Simon, A. A.; Spiga, A.; Fouchet, T. +3 more
Context. Saturn's polar upper atmosphere exhibits significant auroral activity; however, its impact on stratospheric chemistry (i.e. the production of benzene and heavier hydrocarbons) and thermal structure remains poorly documented.
Aims: We aim to bring new constraints on the benzene distribution in Saturn's stratosphere, to characterize po…
Dynamics of Rotation in M Dwarfs: Indications for a Change in the Dynamo Regime in Stars at the Onset of Complete Convection
Mullan, D. J.; Houdebine, E. R.
We have measured vsin i with high precision for a sample of dM3 stars (86 targets). We detected rotation in 82 stars (73 dM3 stars and nine dM3e stars). We compare our measurements of vsin i for all of the stars in our dM0, dM2, dM3, and dM4 samples to those from other authors. We find a good agreement down to vsin i values of less than 1 km s
A Review of General Physical and Chemical Processes Related to Plasma Sources and Losses for Solar System Magnetospheres
Delcourt, D. C.; Wurz, P.; Jackman, C. M. +13 more
The aim of this paper is to provide a review of general processes related to plasma sources, their transport, energization, and losses in the planetary magnetospheres. We provide background information as well as the most up-to-date knowledge of the comparative studies of planetary magnetospheres, with a focus on the plasma supply to each region o…
Follow-Up Observations Toward Planck Cold Clumps with Ground-Based Radio Telescopes
Kim, Kee-Tae; Lee, Jeong-Eun; Li, Di +26 more
The physical and chemical properties of prestellar cores, especially massive ones, are still far from being well understood due to the lack of a large sample. The low dust temperature ($<$14 K) of Planck cold clumps makes them promising candidates for prestellar objects or for sources at the very initial stages of protostellar collapse. We have…
Inversion of sparse photometric data of asteroids using triaxial ellipsoid shape models and a Lommel-Seeliger scattering law
Cellino, A.; Hestroffer, D.; Muinonen, K. +1 more
The inversion of sparse photometric data of asteroids to derive from them information about the spin and shape properties of the objects is a hot topic in the era of the Gaia space mission. We have used a rigorous analytical treatment of the Lommel-Seeliger light-scattering law computed for the particular case of bodies having the shapes of ideal …
Cosmological constraints on the gravitational interactions of matter and dark matter
Bai, Yang; Salvado, Jordi; Stefanek, Ben A.
Although there is overwhelming evidence of dark matter from its gravitational interaction, we still do not know its precise gravitational interaction strength or whether it obeys the equivalence principle. Using the latest available cosmological data and working within the framework of ΛCDM, we first update the measurement of the multiplicative fa…
Reaching the peak of the quasar spectral energy distribution - I. Observations and models
Done, Chris; Elvis, Martin; McDowell, Jonathan C. +3 more
We perform a spectral analysis of a sample of 11 medium redshift (1.5 ≲ z ≲ 2.2) quasars. Our sample all have optical spectra from the SDSS, infrared spectra from GNIRS and TripleSpec, and X-ray spectra from XMM-Newton. We first analyse the Balmer broad emission line profiles which are shifted into the IR spectra to constrain black hole masses. Th…