Search Publications
Can we distinguish early dark energy from a cosmological constant?
Shi, Difu; Baugh, Carlton M.
Early dark energy (EDE) models are a class of quintessence dark energy with a dynamically evolving scalar field which display a small but non-negligible amount of dark energy at the epoch of matter-radiation equality. Compared with a cosmological constant, the presence of dark energy at early times changes the cosmic expansion history and conseque…
A submillimetre search for pre- and proto-brown dwarfs in Chamaeleon II
de Gregorio-Monsalvo, I.; Eiroa, C.; Bayo, A. +7 more
Context. The Chamaeleon II molecular cloud is an active star-forming region that offers an excellent opportunity to study the formation of brown dwarfs in the southern hemisphere.
Aims: Our aims are to identify a population of pre- and proto-brown dwarfs (5σ mass limit threshold of ~0.015 M⊙) and provide information on the formatio…
Diagnosing shock temperature with NH3 and H2O profiles
Codella, C.; Bachiller, R.; Fuente, A. +9 more
In a previous study of the L1157 B1 shocked cavity, a comparison between NH3(10-00) and H2O(110-101) transitions showed a striking difference in the profiles, with H2O emitting at definitely higher velocities. This behaviour was explained as a result of the high-temperatu…
Spatial Distribution and Kinematics of the Molecular Material Associated with eta Carinae
Menten, Karl M.; Zapata, Luis A.; Rodríguez, Luis F. +3 more
Single-dish submillimeter observations have recently revealed the existence of a substantial, chemically peculiar molecular gas component located in the innermost circumstellar environment of the very massive luminous blue variable star, η Carinae. Here, we present 5″-resolution interferometric observations of the 1\to 0 rotational transition of h…
Study of electric and magnetic field fluctuations from lower hybrid drift instability waves in the terrestrial magnetotail with the fully kinetic, semi-implicit, adaptive multi level multi domain method
Lapenta, G.; Norgren, C.; Markidis, S. +3 more
The newly developed fully kinetic, semi-implicit, adaptive multi-level multi-domain (MLMD) method is used to simulate, at realistic mass ratio, the development of the lower hybrid drift instability (LHDI) in the terrestrial magnetotail over a large wavenumber range and at a low computational cost. The power spectra of the perpendicular electric fi…
Photometry of dust grains of comet 67P and connection with nucleus regions
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Aims: Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks.
Methods: We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photom…
Simultaneous multi-scale and multi-instrument observations of Saturn's aurorae during the 2013 observing campaign
Baines, K. H.; Johnson, R. E.; Badman, S. V. +14 more
On 21 April 2013, during a co-ordinated Saturn auroral observing campaign, the northern and southern poles of the planet were observed from the Earth using the NASA Infrared Telescope Facility (IRTF), Keck, and Hubble Space Telescope (HST) simultaneously with the Cassini infrared, visible, and ultraviolet remote sensing instruments. We present sim…
Homologous Solar Events on 2011 January 27: Build-up and Propagation in a Complex Coronal Environment
Pick, M.; Démoulin, P.; Zucca, P. +2 more
In spite of the wealth of imaging observations at the extreme-ultraviolet (EUV), X-ray, and radio wavelengths, there are still relatively few cases where all of the imagery is available to study the full development of a coronal mass ejection (CME) event and its associated shock. The aim of this study is to contribute to the understanding of the r…
FK Comae Berenices, King of Spin: The COCOA-PUFS Project
Granzer, T.; Ayres, Thomas R.; Korhonen, H. +8 more
COCOA-PUFS is an energy-diverse, time-domain study of the ultra-fast spinning, heavily spotted, yellow giant FK Comae Berenices (FK Com: HD117555; G4 III). This single star is thought to be a recent binary merger, and is exceptionally active by measure of its intense ultraviolet (UV) and X-ray emissions, and proclivity to flare. COCOA-PUFS was car…
Substructures within a dipolarization front revealed by high-temporal resolution Cluster observations
Fazakerley, A. N.; Owen, C. J.; Guo, R. L. +8 more
The dipolarization front (DF), usually observed near the leading edge of a bursty bulk flow (BBF), is thought to carry an intense current sufficient to modify the large-scale near-Earth magnetotail current system. However, the physical mechanism of the current generation associated with DFs is poorly understood. This is primarily due to the limita…