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The magnetic field and spectral variability of the He-weak star HR 2949
Stahl, O.; Rivinius, Th.; Wade, G. A. +6 more
We analyse a high-resolution spectropolarimetric data set collected for the He-weak B3p IV star HR 2949. The Zeeman effect is visible in the circularly polarized component of numerous spectral lines. The longitudinal magnetic field varies between approximately -650 and +150 G. The polar strength of the surface magnetic dipole is calculated to be 2…
The geological history of Nili Patera, Mars
Fawdon, P.; Skok, J. R.; Balme, M. R. +3 more
Nili Patera is a 50 km diameter caldera at the center of the Syrtis Major Planum volcanic province. The caldera is unique among Martian volcanic terrains in hosting: (i) evidence of both effusive and explosive volcanism, (ii) hydrothermal silica, and (iii) compositional diversity from olivine-rich basalts to silica-enriched units. We have produced…
Null Point Distribution in Global Coronal Potential Field Extrapolations
Parnell, C. E.; Edwards, S. J.
Magnetic null points are points in space where the magnetic field is zero. Thus, they can be important sites for magnetic reconnection by virtue of the fact that they are weak points in the magnetic field and also because they are associated with topological structures, such as separators, which lie on the boundary between four topologically disti…
Dark Jets in Solar Coronal Holes
Young, Peter R.
A new solar feature termed a dark jet is identified from observations of an extended solar coronal hole that was continuously monitored for over 44 hr by the Extreme Ultraviolet Imaging Spectrometer on board the Hinode spacecraft in 2011 February 8-10 as part of Hinode Operation Plan No. 177 (HOP 177). Line of sight (LOS) velocity maps derived fro…
Photometry of Pluto 2008-2014: Evidence of Ongoing Seasonal Volatile Transport and Activity
Buratti, B. J.; Dalba, P. A.; Hillier, J. K. +6 more
The New Horizons spacecraft will encounter Pluto in 2015 July. As this fast flyby will yield a picture of Pluto frozen in time, ground-based observations are key to understanding this dwarf ice planet, especially with regard to the seasonal transport of surface volatiles. This paper reports on changes in Pluto's rotational light curve as evidence …
The Progenitor of the FUor-Type Young Eruptive Star 2MASS J06593158-0405277
Ábrahám, P.; Kóspál, Á.; Moór, A. +3 more
Only a dozen confirmed FU Orionis-type young outbursting stars (FUors) are known today; this explains the interest in the recent FUor eruption of 2MASS J06593158-0405277. Its outburst and expected decline will be subject to numerous studies in the future. Almost equally important for the understanding of the eruption mechanism, however, is the phy…
Detecting the cosmological neutrino background in the CMB
Sellentin, Elena; Durrer, Ruth
Three relativistic particles in addition to the photon are detected in the cosmic microwave background (CMB). In the standard model of cosmology, these are interpreted as the three neutrino species. However, at the time of CMB decoupling, neutrinos are not only relativistic but they are also free-streaming. Here we investigate whether the CMB is s…
Mineralogy, morphology and stratigraphy of the light-toned interior layered deposits at Juventae Chasma
Flahaut, Jessica; Weitz, Catherine M.; Bishop, Janice L. +6 more
Juventae Chasma is a deep depression located north of Valles Marineris on Mars, with four bright mounds or light-toned interior layered deposits (ILDs) extending upwards from the Canyon floor. We present here the results of long-term imaging of Juventae Chasma including mounds A, B, C, and D using multiple datasets. Monohydrated sulfates (MHS) wer…
(No) dimming of X-ray clusters beyond z ∼ 1 at fixed mass: crude redshifts and masses from raw X-ray and SZ data
Sunyaev, R.; Churazov, E.; Vikhlinin, A.
Scaling relations in the Λ cold dark matter cosmology predict that for a given mass the clusters formed at larger redshift are hotter, denser and therefore more luminous in X-rays than their local z ∼ 0 counterparts. This effect overturns the decrease in the observable X-ray flux so that it does not decrease at z > 1, similar to the SZ signal. …
XMM-Newton and Suzaku X-Ray Shadowing Measurements of the Solar Wind Charge Exchange, Local Bubble, and Galactic Halo Emission
Henley, David B.; Shelton, Robin L.
We present results from a sample of XMM-Newton and Suzaku observations of interstellar clouds that cast shadows in the soft X-ray background (SXRB)—the first uniform analysis of such a sample from these missions. By fitting to the on- and off-shadow spectra, we separated the foreground and Galactic halo components of the SXRB. We tested different …