Search Publications
Incidence of debris discs around FGK stars in the solar neighbourhood
Heras, A. M.; Fridlund, M.; Krivov, A. V. +16 more
Context. Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their counterparts in the solar system are the asteroid and Edgeworth-Kuiper belts.
Aims: The aim of this paper is to provide robust numbers for the incidence of debris discs around FGK stars in the solar neighbourh…
Subproton-scale Cascades in Solar Wind Turbulence: Driven Hybrid-kinetic Simulations
Rincon, F.; Califano, F.; Cerri, S. S. +2 more
A long-lasting debate in space plasma physics concerns the nature of subproton-scale fluctuations in solar wind (SW) turbulence. Over the past decade, a series of theoretical and observational studies were presented in favor of either kinetic Alfvén wave (KAW) or whistler turbulence. Here, we investigate numerically the nature of the subproton-sca…
Bayesian model selection without evidences: application to the dark energy equation-of-state
Hobson, M. P.; Lasenby, A. N.; Hee, S. +1 more
A method is presented for Bayesian model selection without explicitly computing evidences, by using a combined likelihood and introducing an integer model selection parameter n so that Bayes factors, or more generally posterior odds ratios, may be read off directly from the posterior of n. If the total number of models under consideration is speci…
Cosmology and the neutrino mass ordering
Hannestad, Steen; Schwetz, Thomas
We propose a simple method to quantify a possible exclusion of the inverted neutrino mass ordering from cosmological bounds on the sum of the neutrino masses. The method is based on Bayesian inference and allows for a calculation of the posterior odds of normal versus inverted ordering. We apply the method for a specific set of current data from P…
Solar energetic particle access to distant longitudes through turbulent field-line meandering
Laitinen, T.; Dalla, S.; Kopp, A. +2 more
Context. Current solar energetic particle (SEP) propagation models describe the effects of interplanetary plasma turbulence on SEPs as diffusion, using a Fokker-Planck (FP) equation. However, FP models cannot explain the observed fast access of SEPs across the average magnetic field to regions that are widely separated in longitude within the heli…
The Lyman Continuum Escape Fraction of the Cosmic Horseshoe: A Test of Indirect Estimates
Lewis, Geraint F.; Pettini, Max; Siana, Brian +6 more
High-redshift star-forming galaxies are likely responsible for the reionization of the universe, yet direct detection of their escaping ionizing (Lyman continuum [LyC]) photons has proven to be extremely challenging. In this study, we search for escaping LyC of the Cosmic Horseshoe, a gravitationally lensed, star-forming galaxy at z = 2.38 with a …
Size evolution of star-forming galaxies with 2 <z < 4.5 in the VIMOS Ultra-Deep Survey
Maccagni, D.; Giavalisco, M.; Fontana, A. +15 more
Context. The size of a galaxy encapsulates the signature of the different physical processes driving its evolution. The distribution of galaxy sizes in the Universe as a function of cosmic time is therefore a key to understand galaxy evolution.
Aims: We aim to measure the average sizes and size distributions of galaxies as they are assembling…
Disappearance of the Progenitor of Supernova iPTF13bvn
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +13 more
Supernova (SN) iPTF13bvn in NGC 5806 was the first Type Ib SN to have been tentatively associated with a progenitor in pre-explosion images. We performed deep ultraviolet (UV) and optical Hubble Space Telescope observations of the SN site ∼740 days after explosion. We detect an object in the optical bands that is fainter than the pre-explosion obj…
A primordial origin for molecular oxygen in comets: a chemical kinetics study of the formation and survival of O2 ice from clouds to discs
van Dishoeck, E. F.; Walsh, C.; Taquet, V. +1 more
Molecular oxygen has been confirmed as the fourth most abundant molecule in cometary material (O2/H2O ∼ 4 per cent) and is thought to have a primordial nature, I.e. coming from the interstellar cloud from which our Solar system was formed. However, interstellar O2 gas is notoriously difficult to detect and has only…
The evolved-star dust budget of the Small Magellanic Cloud: the critical role of a few key players
Boyer, M. L.; Meixner, M.; Kemper, F. +3 more
The life cycle of dust in the interstellar medium is heavily influenced by outflows from asymptotic giant branch (AGB) and red supergiant (RSG) stars, a large fraction of which is contributed by a few very dusty sources. We compute the dust input to the Small Magellanic Cloud (SMC) by fitting the multi-epoch mid-infrared spectral energy distributi…