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Reconciling the Predictions of Microlensing Analysis with Radial Velocity Measurements for OGLE-2011-BLG-0417
Boisse, I.; Bachelet, E.; Street, R. A. +2 more
Microlensing is able to reveal multiple body systems located several kilo-parsec away from the Earth. Since it does not require the measurement of light from the lens, microlensing is sensitive to a range of objects, from free-floating planets to stellar black holes. But, if the lens emits enough light, the microlensing model predictions can be te…
Very narrow coronal mass ejections producing solar energetic particles
Gopalswamy, N.; Wheatland, M. S.; Bronarska, K. +1 more
Aims: Our main aim is to study the relationship between low-energy solar particles (energies below 1 MeV) and very narrow coronal mass ejections ("jets" with angular width ≤ 20°).
Methods: For this purpose, we considered 125 very narrow coronal mass ejections (CMEs) from 1999 to 2003 that are potentially associated with low-energy solar …
First Observation of Transport of Solar Wind Protons Scattered From Magnetic Anomalies Into the Near Lunar Wake: Observations by SARA/Chandrayaan-1
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +5 more
We report the first observational evidence for the transport of the solar wind protons scattered from the lunar magnetic anomaly (LMA) into the near wake region from SWIM/Sub-keV Atom Reflecting Analyzer (SARA) aboard Chandrayaan-1. These protons with high angular spread are observed in the near wake region for specific orientations of interplanet…
Enceladus' near-surface CO2 gas pockets and surface frost deposits
McCord, Thomas B.; Radebaugh, Jani; Combe, Jean-Philippe +4 more
Solid CO2 surface deposits were reported in Enceladus' South Polar Region by Brown et al. (2006). They noted that such volatile deposits are temporary and posited ongoing replenishment. We present a model for this replenishment by expanding on the Matson et al. (2012) model of subsurface heat and chemical transport in Enceladus. Our mod…
Aerosols: The key to understanding Titan's lower ionosphere
López-Moreno, J. J.; Molina-Cuberos, G. J.; Witasse, O. +2 more
The Permittivity Wave and Altimetry system on board the Huygens probe observed an ionospheric hidden layer at a much lower altitude than the main ionosphere during its descent through the atmosphere of Titan, the largest satellite of Saturn. Previous studies predicted a similar ionospheric layer. However, neither previous nor post-Huygens theoreti…
Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation
Dandouras, I.; Kistler, L. M.; Rème, H. +7 more
The influence of the interplanetary magnetic field (IMF) cone angle θ (the angle between the IMF direction and the Sun-Earth line) on the invariant latitudes of the footprints of the field-aligned currents (FACs) in the magnetotail has been investigated. We performed a statistical study of 542 FAC cases observed by the four Cluster spacecraft in t…
Herschel and ALMA Observations of Massive SZE-selected Clusters
Hilton, Matt; Sifón, Cristóbal; Devlin, Mark J. +6 more
We present new Herschel observations of four massive, Sunyaev-Zel’dovich effect-selected clusters at 0.3≤slant z≤slant 1.1, two of which have also been observed with the Atacama Large Millimeter/submillimeter Array (ALMA). We detect 19 Herschel/Photoconductor Array Camera and Spectrometer (PACS) counterparts to spectroscopically confirmed cluster …
Dynamical masses of M-dwarf binaries in young moving groups. II. Toward empirical mass-luminosity isochrones
Henning, Thomas; Brandner, Wolfgang; Girard, Julien +6 more
Low-mass stars exhibit substantial pre-main sequence evolution during the first ∼100 Myr of their lives. Thus, young M-type stars are prime targets for isochronal dating, especially in young moving groups (YMGs), which contain large amounts of stars in this mass and age range. If the mass and luminosity of a star can both be directly determined, t…
The nature of the Stingray nebula from radio observations
De Marco, Orsola; Cunningham, Maria; Harvey-Smith, Lisa +5 more
We have analysed the full suite of Australia Telescope Compact Array data for the Stingray planetary nebula. Data were taken in the 4-23 GHz range of radio frequencies between 1991 and 2016. The radio flux density of the nebula generally declined during that period, but between 2013 and 2016 it shows signs of halting that decline. We produced the …
Embedded AGN and star formation in the central 80 pc of IC 3639
Tristram, K. R. W.; Gandhi, P.; Weigelt, G. +2 more
Aims: Our goal is to probe the inner structure and the nature of the mid-IR emission in the active galaxy IC 3639, which hosts a Seyfert 2 nucleus and shows signatures of strong star-forming activity.
Methods: We used interferometric observations in the N-band with VLTI/MIDI to resolve the mid-IR emission of this nucleus. The origin of t…