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Spatially Resolved Imaging of the Two-component η Crv Debris Disk with Herschel
Pinte, C.; Duchêne, G.; Clampin, M. +13 more
We present far-infrared and submillimeter images of the η Crv debris disk system obtained with Herschel and SCUBA-2, as well as Hubble Space Telescope visible and near-infrared coronagraphic images. In the 70 µm Herschel image, we clearly separate the thermal emission from the warm and cold belts in the system, find no evidence for a putativ…
Lunar polar craters - Icy, rough or just sloping?
Smith, David; Eke, Vincent R.; Bartram, Sarah A. +2 more
Circular Polarisation Ratio (CPR) mosaics from Mini-SAR on Chandrayaan-1 and Mini-RF on LRO are used to study craters near to the lunar north pole. The look direction of the detectors strongly affects the appearance of the crater CPR maps. Rectifying the mosaics to account for parallax also significantly changes the CPR maps of the crater interior…
Constraining hot plasma in a non-flaring solar active region with FOXSI hard X-ray observations
Krucker, Säm; Shimojo, Masumi; Ishibashi, Kazunori +6 more
We present new constraints on the high-temperature emission measure of a non-flaring solar active region using observations from the recently flown Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket payload. FOXSI has performed the first focused hard X-ray (HXR) observation of the Sun in its first successful flight on 2012 November 2. Focu…
Observational evidence for buffeting-induced kink waves in solar magnetic elements
Berrilli, F.; Consolini, G.; Stangalini, M. +2 more
The role of diffuse photospheric magnetic elements in the energy budget of the upper layers of the Sun's atmosphere has been the recent subject of many studies. This was made possible by the availability of high temporal and spatial resolution observations of the solar photosphere, allowing large numbers of magnetic elements to be tracked to study…
Modelling total solar irradiance since 1878 from simulated magnetograms
Solanki, S. K.; Krivova, N. A.; Jiang, J. +1 more
Aims: We present a new model of total solar irradiance (TSI) based on magnetograms simulated with a surface flux transport model (SFTM) and the Spectral And Total Irradiance REconstructions (SATIRE) model. Our model provides daily maps of the distribution of the photospheric field and the TSI starting from 1878.
Methods: The modelling is…
Hubble Space Telescope Emission Line Galaxies at z ~ 2: The Lyα Escape Fraction
Schneider, Donald P.; Blanc, Guillermo A.; Gronwall, Caryl +8 more
We compare the Hβ line strengths of 1.90 < z < 2.35 star-forming galaxies observed with the near-IR grism of the Hubble Space Telescope with ground-based measurements of Lyα from the HETDEX Pilot Survey and narrow-band imaging. By examining the line ratios of 73 galaxies, we show that most star-forming systems at this epoch have a Lyα escape…
Spectroscopy and detectability of liquid brines on mars
Pommerol, A.; Schmitt, B.; Massé, M. +5 more
Recent geomorphological observations as well as chemical and thermodynamic studies demonstrate that liquid water should be stable today on the Martian surface at some times of the day. In Martian conditions, brines would be particularly more stable than pure water because salts can depress the freezing point and lower the evaporation rate of water…
B fields in OB stars (BOB): The discovery of a magnetic field in a multiple system in the Trifid nebula, one of the youngest star forming regions
Ilyin, I.; Carroll, T. A.; González, J. F. +11 more
Aims: Recent magnetic field surveys in O- and B-type stars revealed that about 10% of the core-hydrogen-burning massive stars host large-scale magnetic fields. The physical origin of these fields is highly debated. To identify and model the physical processes responsible for the generation of magnetic fields in massive stars, it is important …
Investigating the mass of the intermediate mass black hole candidate HLX-1 with the slimbh model
Godet, Olivier; Barret, Didier; Webb, Natalie +2 more
In this paper we present a comprehensive study of the mass of the intermediate mass black hole candidate HLX-1 in the galaxy ESO 243-49. We analyse the continuum X-ray spectra collected by Swift, XMM-Newton, and Chandra with the slim disc model, slimbh, and estimate the black hole mass for the full range of inclination (inc = 0°-85°) and spin (a
A Search for Companions to Brown Dwarfs in the Taurus and Chamaeleon Star-Forming Regions
Todorov, K. O.; Luhman, K. L.; Konopacky, Q. M. +5 more
We have used WFPC2 on board the Hubble Space Telescope to obtain images of 47 members of the Taurus and Chamaeleon I star-forming regions that have spectral types of M6-L0 (M ~ 0.01-0.1 M ⊙). An additional late-type member of Taurus, FU Tau (M7.25+M9.25), was also observed with adaptive optics at Keck Observatory. In these images, we ha…