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Quintessential inflation with canonical and noncanonical scalar fields and Planck 2015 results
Geng, Chao-Qiang; Saridakis, Emmanuel N.; Myrzakulov, R. +2 more
We investigate two classes of models of quintessential inflation, based upon canonical as well as noncanonical scalar fields. In particular, introducing potentials steeper than the standard exponential, we construct models that can give rise to a successful inflationary phase, with signatures consistent with Planck 2015 results. Additionally, usin…
The Complex Accretion Geometry of GX 339-4 as Seen by NuSTAR and Swift
Harrison, F. A.; Stern, D.; Zhang, W. W. +19 more
We present spectral analyses of five Nuclear Spectroscopic Telescope Array and Swift observations of GX 339-4 taken during a failed outburst during the summer of 2013. These observations cover Eddington luminosity fractions in the range ≈0.9%-6%. Throughout this outburst GX 339-4 stayed in the hard state and all five observations show similar X-ra…
The Martian atmospheric ion escape rate dependence on solar wind and solar EUV conditions: 1. Seven years of Mars Express observations
Barabash, Stas; Nilsson, Hans; Holmström, Mats +3 more
More than 7 years of ion flux measurements in the energy range 10 eV-15 keV have allowed the ASPERA-3/IMA (Analyzer of Space Plasmas and Energetic Ions/Ion Mass Analyzer) instrument on Mars Express to collect a large database of ion measurements in the Mars environment, over a wide range of upstream solar wind (density and velocity) and radiation …
X-Ray and Radio Emission from Type IIn Supernova SN 2010jl
Chandra, Poonam; Fransson, Claes; Chevalier, Roger A. +2 more
We present all X-ray and radio observations of the Type IIn supernova SN 2010jl. The X-ray observations cover a period up to day 1500 with Chandra, XMM-Newton, NuSTAR, and Swift-X-ray Telescope (XRT). The Chandra observations after 2012 June, the XMM-Newton observation in 2013 November, and most of the Swift-XRT observations until 2014 December ar…
The Formation of IRIS Diagnostics. IV. The Mg II Triplet Lines as a New Diagnostic for Lower Chromospheric Heating
De Pontieu, Bart; Hansteen, Viggo; Carlsson, Mats +1 more
A triplet of subordinate lines of Mg ii exists in the region around the h&k lines. In solar spectra these lines are seen mostly in absorption, but in some cases can become emission lines. The aim of this work is to study the formation of this triplet, and investigate any diagnostic value they can bring. Using 3D radiative magnetohydrodynamic s…
CHAOS II. Gas-phase Abundances in NGC 5194
Skillman, Evan D.; Moustakas, John; Croxall, Kevin V. +2 more
We have observed NGC 5194 (M51a) as part of the CHemical Abundances of Spirals project. Using the Multi Object Double Spectrographs on the Large Binocular Telescope we are able to measure one or more of the temperature-sensitive auroral lines ([O iii] λ4363, [N ii] λ5755, [S iii] λ6312) and thus measure “direct” gas-phase abundances in 29 individu…
Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 µm
Dahle, H.; Lundqvist, P.; Östlin, G. +36 more
We present ultraviolet (UV) observations of six nearby Type Ia supernovae (SNe Ia) obtained with the Hubble Space Telescope, three of which were also observed in the near-IR (NIR) with Wide-Field Camera 3. UV observations with the Swift satellite, as well as ground-based optical and NIR data provide complementary information. The combined data set…
Possible binary progenitors for the Type Ib supernova iPTF13bvn
Fraser, Morgan; Eldridge, J. J.; Smartt, Stephen J. +1 more
Cao et al. reported a possible progenitor detection for the Type Ib supernovae iPTF13bvn for the first time. We find that the progenitor is in fact brighter than the magnitudes previously reported by approximately 0.7-0.2 mag with a larger error in the bluer filters. We compare our new magnitudes to our large set of binary evolution models and fin…
Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
García, R. A.; Chaplin, W. J.; Lund, M. N. +13 more
The solar analogues 16 Cyg A and B are excellent asteroseismic targets in the Kepler field of view and together with a red dwarf and a Jovian planet form an interesting system. For these more evolved Sun-like stars we cannot detect surface rotation with the current Kepler data but instead use the technique of asteroseimology to determine rotationa…
Molecular gas content in strongly lensed z ~ 1.5-3 star-forming galaxies with low infrared luminosities
Kneib, J. -P.; Schaerer, D.; Dessauges-Zavadsky, M. +10 more
To extend the molecular gas measurements to more typical star-forming galaxies (SFGs) with star formation rates SFR< 40 M⊙ yr-1 and stellar masses M∗< 2.5 × 1010M⊙ at z ~ 1.5-3, we have observed CO emission with the IRAM Plateau de Bure Interferometer and the IRAM 30 m telescope for five…