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Density diagnostics derived from the O iv and S iv intercombination lines observed by IRIS
Mason, H. E.; Del Zanna, G.; Reeves, K. K. +3 more
The intensity of the O iv 2s2 2p 2P-2s2p24P and S iv 3 s2 3p 2P-3s 3p24 P intercombination lines around 1400 Å observed with the Interface Region Imaging Spectrograph (IRIS) provide a useful tool to diagnose the electron number density (Ne) in the so…
CSI 2264: Characterizing Young Stars in NGC 2264 with Stochastically Varying Light Curves
Song, Inseok; Gillen, Edward; Cody, Ann Marie +25 more
We provide CoRoT and Spitzer light curves and other supporting data for 17 classical T Tauri stars in NGC 2264 whose CoRoT light curves exemplify the “stochastic” light curve class as defined in 2014 by Cody et al. The most probable physical mechanism to explain the optical variability within this light curve class is time-dependent mass accretion…
Cosmochemical implications of CONSERT permittivity characterization of 67P/CG
Lasue, J.; Quirico, E.; Kofman, W. +7 more
Analysis of the propagation of the Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) signal throughout the small lobe of the 67P/CG nucleus has permitted us to deduce the real part of the permittivity, at a value of 1.27 ± 0.05. The first interpretation of this value, using the dielectric properties of mixtures of ices (H2…
Cross-scale energy transport in space plasmas
Nykyri, K.; Moore, T. W.; Dimmock, A. P.
The solar wind is a supersonic magnetized plasma streaming far into the heliosphere. Although cooling as it flows, it is rapidly heated upon encountering planetary obstacles. At Earth, this interaction forms the magnetosphere and its sub-regions. The present paper focuses on particle heating across the boundary separating the shocked solar wind an…
Fan-shaped jets above the light bridge of a sunspot driven by reconnection
Rouppe van der Voort, Luc; Leenaarts, Jorrit; Robustini, Carolina +1 more
We report on a fan-shaped set of high-speed jets above a strongly magnetized light bridge (LB) of a sunspot observed in the Hα line. We study the origin, dynamics, and thermal properties of the jets using high-resolution imaging spectroscopy in Hα from the Swedish 1m Solar Telescope and data from the Solar Dynamics Observatory and Hinode. The Hα j…
SN Refsdal: Classification as a Luminous and Blue SN 1987A-like Type II Supernova
Zitrin, A.; Filippenko, A. V.; Foley, R. J. +20 more
We have acquired Hubble Space Telescope (HST) and Very Large Telescope near-infrared spectra and images of supernova (SN) Refsdal after its discovery as an Einstein cross in fall 2014. The HST light curve of SN Refsdal has a shape consistent with the distinctive, slowly rising light curves of SN 1987A-like SNe, and we find strong evidence for a br…
Measuring the stellar wind parameters in IGR J17544-2619 and Vela X-1 constrains the accretion physics in supergiant fast X-ray transient and classical supergiant X-ray binaries
Sander, A.; Hamann, W. -R.; Shenar, T. +9 more
Context. Classical supergiant X-ray binaries (SGXBs) and supergiant fast X-ray transients (SFXTs) are two types of high-mass X-ray binaries (HMXBs) that present similar donors but, at the same time, show very different behavior in the X-rays. The reason for this dichotomy of wind-fed HMXBs is still a matter of debate. Among the several explanation…
Origin of Molecular Oxygen in Comet 67P/Churyumov-Gerasimenko
Wurz, P.; Altwegg, K.; Bieler, A. +13 more
Molecular oxygen has been detected in the coma of comet 67P/Churyumov-Gerasimenko with abundances in the 1%-10% range by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis-Double Focusing Mass Spectrometer instrument on board the Rosetta spacecraft. Here we find that the radiolysis of icy grains in low-density environments such as the p…
A PSF-based approach to Kepler/K2 data - I. Variability within the K2 Campaign 0 star clusters M 35 and NGC 2158
Bedin, L. R.; Piotto, G.; Nardiello, D. +1 more
Kepler and K2 data analysis reported in the literature is mostly based on aperture photometry. Because of Kepler's large, undersampled pixels and the presence of nearby sources, aperture photometry is not always the ideal way to obtain high-precision photometry, and, because of this, the data set has not been fully exploited so far. We present a n…
A Herschel-SPIRE survey of the Mon R2 giant molecular cloud: analysis of the gas column density probability density function
Henning, T.; Gutermuth, R.; Wolk, S. J. +8 more
We present a far-IR survey of the entire Mon R2 giant molecular cloud (GMC) with Herschel-Spectral and Photometric Imaging REceiver cross-calibrated with Planck-High Frequency Instrument data. We fit the spectral energy distributions of each pixel with a greybody function and an optimal beta value of 1.8. We find that mid-range column densities ob…