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Time-resolved Ultraviolet Spectroscopy of the M-dwarf GJ 876 Exoplanetary System
Roberge, Aki; France, Kevin; Linsky, Jeffrey L. +2 more
Extrasolar planets orbiting M-stars may represent our best chance to discover habitable worlds in the coming decade. The ultraviolet spectrum incident upon both Earth-like and Jovian planets is critically important for proper modeling of their atmospheric heating and chemistry. In order to provide more realistic inputs for atmospheric models of pl…
Strong lensing by a node of the cosmic web. The core of MACS J0717.5+3745 at z = 0.55
Smail, I.; Kneib, J. -P.; Smith, G. P. +9 more
We present results of a strong-lensing analysis of MACS J0717.5+3745 (hereafter MACS J0717), an extremely X-ray luminous galaxy cluster at z = 0.55. Observations at different wavelengths reveal a complex and dynamically very active cluster, whose core is connected to a large scale filament extended over several Mpc. Using multi-passband imaging da…
Gas Emissions in Planck Cold Dust Clumps—A Survey of the J = 1-0 Transitions of 12CO, 13CO, and C18O
Li, Di; Liu, Tie; Qin, Sheng-Li +3 more
A survey toward 674 Planck cold clumps of the Early Cold Core Catalogue (ECC) in the J = 1-0 transitions of 12CO, 13CO, and C18O has been carried out using the Purple Mountain Observatory 13.7 m telescope. Six hundred seventy-three clumps were detected with 12CO and 13CO emission, and 68% of t…
Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452
Poretti, E.; Rainer, M.; Samadi, R. +24 more
Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way, p-modes are observed in stars that are hotter than or equal to the B3 spectral …
The INTEGRAL/IBIS AGN catalogue - I. X-ray absorption properties versus optical classification
Masetti, N.; Bird, A. J.; Ubertini, P. +5 more
In this work we present the most comprehensive INTEGRAL active galactic nucleus (AGN) sample. It lists 272 AGN for which we have secure optical identifications, precise optical spectroscopy and measured redshift values plus X-ray spectral information, i.e. 2-10 and 20-100 keV fluxes plus column density. Here we mainly use this sample to study the …
Non-neutralized Electric Current Patterns in Solar Active Regions: Origin of the Shear-generating Lorentz Force
Mikić, Zoran; Georgoulis, Manolis K.; Titov, Viacheslav S.
Using solar vector magnetograms of the highest available spatial resolution and signal-to-noise ratio, we perform a detailed study of electric current patterns in two solar active regions (ARs): a flaring/eruptive and a flare-quiet one. We aim to determine whether ARs inject non-neutralized (net) electric currents in the solar atmosphere, respondi…
Distance and Kinematics of the Red Hypergiant VY CMa: Very Long Baseline Array and Very Large Array Astrometry
Menten, K. M.; Zhang, B.; Reid, M. J. +1 more
We report astrometric results of phase-referencing very long baseline interferometry observations of 43 GHz SiO maser emission toward the red hypergiant VY Canis Majoris (VY CMa) using the Very Long Baseline Array (VLBA). We measured a trigonometric parallax of 0.83 ± 0.08 mas, corresponding to a distance of 1.20+0.13 -0.10 k…
Optical constants of Titan tholins at mid-infrared wavelengths (2.5-25 µm) and the possible chemical nature of Titan’s haze particles
Khare, Bishun N.; McKay, Christopher P.; Cruikshank, Dale P. +1 more
Complex organic materials may exist as haze layers in the atmosphere of Titan and as dark coloring agents on icy satellite surfaces. Laboratory measurements of optical constants of plausible complex organic materials are necessary for quantitative evaluation from remote sensing observations, and to document the existence of complex organic materia…
Photoevaporating Proplyd-like Objects in Cygnus OB2
Drake, Jeremy J.; Gutermuth, Robert A.; Wright, Nicholas J. +4 more
We report the discovery of 10 proplyd-like objects in the vicinity of the massive OB association Cygnus OB2. They were discovered in IPHAS Hα images and are clearly resolved in broadband Hubble Space Telescope/Advanced Camera for Surveys, near-IR, and Spitzer mid-IR images. All exhibit the familiar tadpole shape seen in photoevaporating objects su…
The calculation of Afρ and mass loss rate for comets
Rubin, Martin; Fink, Uwe
Ab initio calculations of Afρ are presented using Mie scattering theory and a Direct Simulation Monte Carlo (DSMC) dust outflow model in support of the Rosetta mission and its target 67P/Churyumov-Gerasimenko (CG). These calculations are performed for particle sizes ranging from 0.010 µm to 1.0 cm. The present status of our knowledge of vari…