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Systematic analysis of occurrence of equatorial noise emissions using 10 years of data from the Cluster mission
Santolík, O.; Němec, F.; Cornilleau-Wehrlin, N. +2 more
We report results of a systematic analysis of equatorial noise (EN) emissions which are also known as fast magnetosonic waves. EN occurs in the vicinity of the geomagnetic equator at frequencies between the local proton cyclotron frequency and the lower hybrid frequency. Our analysis is based on the data collected by the Spatio-Temporal Analysis o…
The Inner Disk Structure, Disk-Planet Interactions, and Temporal Evolution in the β Pictoris System: A Two-epoch HST/STIS Coronagraphic Study
Schneider, Glenn; Apai, Dániel; Wyatt, Mark C. +5 more
We present deep Hubble Space Telescope/Space Telescope Imaging Spectrograph coronagraphic images of the β Pic debris disk obtained at two epochs separated by 15 yr. The new images and the re-reduction of the 1997 data provide the most sensitive and detailed views of the disk at optical wavelengths as well as the yet smallest inner working angle op…
A Luminous Red Nova in M31 and its Progenitor System
Steele, I. A.; Bode, M. F.; Darnley, M. J. +1 more
We present observations of M31LRN 2015 (MASTER OT J004207.99+405501.1), discovered in M31 in 2015 January, and identified as a rare and enigmatic luminous red nova (LRN). Spectroscopic and photometric observations obtained by the Liverpool Telescope showed the LRN becoming extremely red as it faded from its {{M}V}=-9.4+/- 0.2 peak. Earl…
The Formation of IRIS Diagnostics. VI. The Diagnostic Potential of the C II Lines at 133.5 nm in the Solar Atmosphere
De Pontieu, Bart; Carlsson, Mats; Leenaarts, Jorrit +1 more
We use 3D radiation magnetohydrodynamic models to investigate how the thermodynamic quantities in the simulation are encoded in observable quantities, thus exploring the diagnostic potential of the C ii 133.5 nm lines. We find that the line core intensity is correlated with the temperature at the formation height but the correlation is rather weak…
Spitzer infrared spectrograph point source classification in the Small Magellanic Cloud
van Loon, J. Th.; Antoniou, V.; Szczerba, R. +16 more
The Magellanic Clouds are uniquely placed to study the stellar contribution to dust emission. Individual stars can be resolved in these systems even in the mid-infrared, and they are close enough to allow detection of infrared excess caused by dust. We have searched the Spitzer Space Telescope data archive for all Infrared Spectrograph (IRS) stari…
Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
Väliviita, Jussi; Palmgren, Elina
We employ the Planck 2013 CMB temperature anisotropy and lensing data, and baryon acoustic oscillation (BAO) data to constrain a phenomenological wCDM model, where dark matter and dark energy interact. We assume time-dependent equation of state parameter for dark energy, and treat dark matter and dark energy as fluids whose energy-exchange rate is…
The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow
Ginsburg, Adam; Youngblood, Allison; Bally, John +1 more
Aims: Adaptive optics (AO) images are used to test the hypothesis that the explosive BN/KL outflow from the Orion OMC1 cloud core was powered by the dynamical decay of a non-hierarchical system of massive stars.
Methods: Narrow-band H2, [Fe ii], and broad-band Ks obtained with the Gemini South multi-conjugate AO sys…
Rosetta observations of solar wind interaction with the comet 67P/Churyumov-Gerasimenko
Behar, E.; Goldstein, R.; Mokashi, P. +7 more
Context. The Rosetta spacecraft arrived at the comet 67P/Churyumov-Gerasimenko on August 6, 2014, which has made it possible to perform the first study of the solar wind interacting with the coma of a weakly outgassing comet.
Aims: It is shown that the solar wind experiences large deflections (>45°) in the weak coma. The average ion veloci…
ALMA Observations of Warm Dense Gas in NGC 1614—Breaking of the Star Formation Law in the Central Kiloparsec
Sanders, D. B.; Inami, H.; Murphy, E. J. +20 more
We present ALMA Cycle-0 observations of the CO (6-5) line emission and of the 435 µm dust continuum emission in the central kiloparsec of NGC 1614, a local luminous infrared galaxy at a distance of 67.8 Mpc (1{\prime \prime }= 329 pc). The CO emission is well resolved by the ALMA beam (0.''26 × 0.''20) into a circumnuclear ring, w…
Combining power spectrum and bispectrum measurements to detect oscillatory features
Liguori, M.; Shellard, E. P. S.; Fergusson, J. R. +1 more
The simplest inflationary models present us with few observable parameters to discriminate between them. A detection of features in the spectra of primordial density perturbations could provide valuable insights and lead to stringent tests of models of the early Universe. So far, searches for oscillatory features have not produced statistically si…