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Identifying the magnetotail lobes with Cluster magnetometer data
Jackman, C. M.; Forsyth, C.; Rae, I. J. +2 more
We describe a novel method for identifying times when a spacecraft is in Earth's magnetotail lobes solely using magnetometer data. We propose that lobe intervals can be well identified as times when the magnetic field is strong and relatively invariant, defined using thresholds in the magnitude of BX and the standard deviation σ of the …
Broad-band spectroscopy of the transient X-ray binary pulsar KS 1947+300 during 2013 giant outburst: Detection of pulsating soft X-ray excess component
Naik, Sachindra; Jaisawal, Gaurava K.; Epili, Prahlad
We present the results obtained from detailed timing and spectral studies of the Be/X-ray binary pulsar KS 1947+300 during its 2013 giant outburst. We used data from Suzaku observations of the pulsar at two epochs, i.e. on 2013 October 22 (close to the peak of the outburst) and 2013 November 22. X-ray pulsations at ∼18.81 s were clearly detected i…
Mixed inflaton and spectator field models: CMB constraints and µ distortion
Takahashi, Tomo; Sekiguchi, Toyokazu; Enqvist, Kari
We discuss mixed inflaton and spectator field models where both the fields are responsible for the observed density fluctuations. We combine the angular power spectrum of the CMB temperature anisotropy from the Planck 2013 result and other ground-based CMB observations in order to constrain both the general mixed model as well as some specific rep…
Penetration of magnetosheath plasma into dayside magnetosphere: 1. Density, velocity, and rotation
Goldstein, Melvyn L.; Pollock, Craig; Lyatsky, Wladislaw +2 more
In this study, we examine a large number of plasma structures (filaments), observed with the Cluster spacecraft during 2 years (2007-2008) in the dayside magnetosphere but consisting of magnetosheath plasma. To reduce the effects observed in the cusp regions and on magnetosphere flanks, we consider these events predominantly inside the narrow cone…
Exoplanet Detection by Astrometric Method
Xu, W. W.; Liao, X. H.; Zhou, Y. H. +1 more
As we known, the exoplanets are mostly detected by the methods of radial velocity and transit, only one is found by the astrometric method. As the data of the gaia to be released, astrometry will become one of the most important method for detecting exoplanets gradually. Based on the position sequence of stars, this paper discusses the calculation…
Hard X-Ray Tail Discovered in the Clocked Burster GS 1826-238
Jourdain, E.; Roques, J. P.; Rodi, J.
The low-mass X-ray binary (LMXB) neutron star (NS) GS 1826-238 was discovered by Ginga in 1988 September. Due to the presence of quasi-periodicity in the type I X-ray burst rate, the source has been a frequent target of X-ray observations for almost 30 years. Though the bursts were too soft to be detected by INTEGRAL/SPI, the persistent emission f…
Ultraviolet spectral synthesis of HD 72660
Landstreet, J. D.; Golriz, S. S.
The study of chemical abundances in stellar atmosphere provides a useful tool to investigate the formation and evolution history of stars. The optical wavelength range has been used almost exclusively in the past to determine the elemental abundance in A-type stars. We use high-resolution, high signal-to-noise ultraviolet spectra obtained from the…
Electron densities in the ionosphere of Mars: A comparison of MARSIS and radio occultation measurements
Withers, Paul; Vogt, Marissa F.; Fallows, Kathryn +4 more
Radio occultation electron densities measurements from the Mariner 9 and Viking spacecraft, which orbited Mars in the 1970s, have recently become available in a digital format. These data are highly complementary to the radio occultation electron density profiles from Mars Global Surveyor, which were restricted in solar zenith angle and altitude. …
Constraining MOND using the vertical motion of stars in the solar neighbourhood
Margalit, Ben; Shaviv, Nir J.
Stars with a different vertical motion relative to the Galactic disc have a different average acceleration. According to modified Newtonian dynamics (MOND) theories, they should therefore have a different average orbital velocity while revolving around the Milky Way. We show that this property can be used to constrain MOND theories by studying sta…
A plausible link between the asteroid 21 Lutetia and CH carbonaceous chondrites
Fornasier, Sonia; Barucci, Maria A.; Trigo-Rodríguez, Josep M. +3 more
A crucial topic in planetology research is establishing links between primitive meteorites and their parent asteroids. In this study, we investigate the feasibility of a connection between asteroids similar to 21 Lutetia, encountered by the Rosetta mission in July 2010, and the CH3 carbonaceous chondrite Pecora Escarpment 91467 (PCA 91467). Severa…