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BICEP2 constrains composite inflation
Channuie, Phongpichit
In light of BICEP2, we re-examine single field inflationary models in which the inflation is a composite state stemming from various four-dimensional strongly coupled theories. We study in the Einstein frame a set of cosmological parameters, the primordial spectral index ns and tensor-to-scalar ratio r, predicted by such models. We conf…
Full Particle Electromagnetic Simulations of Entropy Generation across a Collisionless Shock
Wang, Rui; Yang, Zhongwei; Liu, Ying D. +5 more
Experimental data from Cluster have shown that entropy density can be generated across Earth's bow shock. These new observations are a starting point for a more sophisticated analysis that includes computer modeling of a collisionless shock using observed shock parameters as input. In this Letter, we present the first comparison between observatio…
Phase-resolved X-ray spectroscopy and spectral energy distribution of the X-ray soft polar RS Caeli
Burwitz, V.; Walter, F. M.; Schwope, A. D. +3 more
Context. RS Cae is the third target in our series of XMM-Newton observations of soft X-ray-dominated polars.
Aims: Our observational campaign aims to better understand and describe the multiwavelength data, the physical properties of the system components, and the short- and long-term behavior of the component fluxes in RS Cae.
Methods: …
Cluster observations of hot He+ events in the inner magnetosphere
Yamauchi, M.; Dandouras, I.; Nilsson, H. +1 more
In the inner magnetosphere inside 65° invariant latitude, Cluster Ion Spectrometry detected hot He+ events of about a few tens to several hundred eV without the same types of hot H+ signature at the same energy. During the 2001-2006 period when the Cluster orbit was almost constant and approximately north-south symmetric at c…
The young binary HD 102077: Orbit, spectral type, kinematics, and moving group membership
Henning, Thomas; Reffert, Sabine; Schlieder, Joshua E. +4 more
The K-type binary star HD 102077 was proposed as a candidate member of the TW Hydrae association (TWA) which is a young (5-15 Myr) moving group in close proximity (~50 pc) to the solar system. The aim of this work is to verify this hypothesis by different means. We first combine diffraction-limited observations from the ESO NTT 3.5 m telescope in …
Constraints on Jupiter's stratospheric HCl abundance and chlorine cycle from Herschel/HIFI
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +1 more
Detection of HCl on Jupiter would provide insight into the chlorine cycle and external elemental fluxes on giant planets, yet so far has not been possible. Here we present the most sensitive search for Jupiter's stratospheric HCl to date using observations of the 625.907 and 1876.221 GHz spectral lines with Herschel's HIFI instrument. HCl was not …
Herschel SPIRE fourier transform spectrometer: calibration of its bright-source mode
Valtchanov, Ivan; Hopwood, Rosalind; Naylor, David A. +10 more
The Fourier Transform Spectrometer (FTS) of the Spectral and Photometric Imaging REceiver (SPIRE) on board the ESA Herschel Space Observatory has two detector setting modes: (a) a nominal mode, which is optimized for observing moderately bright to faint astronomical targets, and (b) a bright-source mode recommended for sources significantly bright…
Signals of solar cosmic ray flux variations inferred from the noise in raw CCD solar images taken by SOHO/EIT
Chae, Jongchul; Oh, Suyeon; Yi, Yu +1 more
The noise embedded in the raw data in one scientific discipline has sometimes been proven to be a valuable signal for another discipline, and there are examples throughout science history. The solar images taken by the solid state detectors (CCDs) of the Sun monitoring satellites are usually cleaned by removing the traces of cosmic rays on the raw…
Water and Martian habitability: Results of an integrative study of water related processes on Mars in context with an interdisciplinary Helmholtz research alliance “Planetary Evolution and Life”
Jaumann, R.; Tirsch, D.; Hiesinger, H. +7 more
A study in context with the Helmholtz Alliance 'Planetary Evolution and Life' focused on the (temporary) existence of liquid water, and the likelihood that Mars has been or even is a habitable planet. Both geomorphological and mineralogical evidence point to the episodic availability of liquid water at the surface of Mars, and physical modeling an…
Weighted statistical parameters for irregularly sampled time series
Rimoldini, Lorenzo
Unevenly spaced time series are common in astronomy because of the day-night cycle, weather conditions, dependence on the source position in the sky, allocated telescope time and corrupt measurements, for example, or inherent to the scanning law of satellites like Hipparcos and the forthcoming Gaia. Irregular sampling often causes clumps of measur…