Search Publications
The Water Cycle
Montmessin, Franck; Fedorova, Anna; Langevin, Yves +2 more
NH3 (10-00) in the pre-stellar core L1544
Codella, C.; Pagani, L.; van Dishoeck, E. F. +11 more
Pre-stellar cores represent the initial conditions in the process of star and planet formation, therefore it is important to study their physical and chemical structure. Because of their volatility, nitrogen-bearing molecules are key to study the dense and cold gas present in pre-stellar cores. The NH3 rotational transition detected wit…
Spontaneous generation of bending waves in isolated Milky Way-like discs
Widrow, Lawrence M.; Chequers, Matthew H.
We study the spontaneous generation and evolution of bending waves in N-body simulations of two isolated Milky Way-like galaxy models. The models differ by their disc-to-halo mass ratios, and hence by their susceptibility to the formation of a bar and spiral structure. Seeded from shot noise in the particle distribution, bending waves rapidly form…
Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI
Eckart, Andreas; Combes, Françoise; Busch, Gerold +4 more
The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
Smalley, Barry; Hellier, Coel; Triaud, Amaury H. M. J. +19 more
We report the discovery of an eclipsing binary system with mass-ratio q ∼ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and follow-up light curves with the Euler and TRAPPIST telescopes. From a joint fit of these data we determine that EBLM J0555-57 consists of a sun-lik…
Simulated forecasts for primordial B -mode searches in ground-based experiments
Dunkley, Joanna; Næss, Sigurd; Alonso, David +1 more
Detecting the imprint of inflationary gravitational waves on the B -mode polarization of the cosmic microwave background (CMB) is one of the main science cases for current and next-generation CMB experiments. In this work we explore some of the challenges that ground-based facilities will have to face in order to carry out this measurement in the …
The pulsating magnetosphere of the extremely slowly rotating magnetic β Cep star ξ1 CMa
Rivinius, Th.; Wade, G. A.; Neiner, C. +4 more
ξ1 CMa is a monoperiodically pulsating, magnetic β Cep star with magnetospheric X-ray emission that, uniquely amongst magnetic stars, is clearly modulated with the star's pulsation period. The rotational period Prot has yet to be identified, with multiple competing claims in the literature. We present an analysis of a large E…
Planck intermediate results. LII. Planet flux densities
Kim, J.; Miville-Deschênes, M. -A.; Boulanger, F. +147 more
Measurements of flux density are described for five planets, Mars, Jupiter, Saturn, Uranus, and Neptune, across the six Planck High Frequency Instrument frequency bands (100-857 GHz) and these are then compared with models and existing data. In our analysis, we have also included estimates of the brightness of Jupiter and Saturn at the three frequ…
Electron heat flux instability
Lazar, M.; Yoon, P. H.; Saeed, Sundas +2 more
The heat flux instability is an electromagnetic mode excited by a relative drift between the protons and two-component core-halo electrons. The most prominent application may be in association with the solar wind where drifting electron velocity distributions are observed. The heat flux instability is somewhat analogous to the electrostatic Bunema…
Precursors of short gamma-ray bursts in the SPI-ACS/INTEGRAL experiment.
Minaev, P. Yu.; Pozanenko, A. S.
We have analyzed the light curves of 519 short gamma-ray bursts (GRBs) detected in the SPI-ACS/INTEGRAL experiment from December 2002 to May 2014 to search for precursors (a possible activity of the GRB source before the beginning of the main episode). Both the light curves of 519 individual events and the averaged light curve of 372 brightest bur…