Search Publications
Stratospheric benzene and hydrocarbon aerosols detected in Saturn's auroral regions
Simon, A. A.; Spiga, A.; Fouchet, T. +3 more
Context. Saturn's polar upper atmosphere exhibits significant auroral activity; however, its impact on stratospheric chemistry (i.e. the production of benzene and heavier hydrocarbons) and thermal structure remains poorly documented.
Aims: We aim to bring new constraints on the benzene distribution in Saturn's stratosphere, to characterize po…
Dynamics of Rotation in M Dwarfs: Indications for a Change in the Dynamo Regime in Stars at the Onset of Complete Convection
Mullan, D. J.; Houdebine, E. R.
We have measured vsin i with high precision for a sample of dM3 stars (86 targets). We detected rotation in 82 stars (73 dM3 stars and nine dM3e stars). We compare our measurements of vsin i for all of the stars in our dM0, dM2, dM3, and dM4 samples to those from other authors. We find a good agreement down to vsin i values of less than 1 km s
A Review of General Physical and Chemical Processes Related to Plasma Sources and Losses for Solar System Magnetospheres
Delcourt, D. C.; Wurz, P.; Jackman, C. M. +13 more
The aim of this paper is to provide a review of general processes related to plasma sources, their transport, energization, and losses in the planetary magnetospheres. We provide background information as well as the most up-to-date knowledge of the comparative studies of planetary magnetospheres, with a focus on the plasma supply to each region o…
Follow-Up Observations Toward Planck Cold Clumps with Ground-Based Radio Telescopes
Kim, Kee-Tae; Lee, Jeong-Eun; Li, Di +26 more
The physical and chemical properties of prestellar cores, especially massive ones, are still far from being well understood due to the lack of a large sample. The low dust temperature ($<$14 K) of Planck cold clumps makes them promising candidates for prestellar objects or for sources at the very initial stages of protostellar collapse. We have…
Inversion of sparse photometric data of asteroids using triaxial ellipsoid shape models and a Lommel-Seeliger scattering law
Cellino, A.; Hestroffer, D.; Muinonen, K. +1 more
The inversion of sparse photometric data of asteroids to derive from them information about the spin and shape properties of the objects is a hot topic in the era of the Gaia space mission. We have used a rigorous analytical treatment of the Lommel-Seeliger light-scattering law computed for the particular case of bodies having the shapes of ideal …
Cosmological constraints on the gravitational interactions of matter and dark matter
Bai, Yang; Salvado, Jordi; Stefanek, Ben A.
Although there is overwhelming evidence of dark matter from its gravitational interaction, we still do not know its precise gravitational interaction strength or whether it obeys the equivalence principle. Using the latest available cosmological data and working within the framework of ΛCDM, we first update the measurement of the multiplicative fa…
Reaching the peak of the quasar spectral energy distribution - I. Observations and models
Done, Chris; Elvis, Martin; McDowell, Jonathan C. +3 more
We perform a spectral analysis of a sample of 11 medium redshift (1.5 ≲ z ≲ 2.2) quasars. Our sample all have optical spectra from the SDSS, infrared spectra from GNIRS and TripleSpec, and X-ray spectra from XMM-Newton. We first analyse the Balmer broad emission line profiles which are shifted into the IR spectra to constrain black hole masses. Th…
Hypervelocity dust impacts on the Wind spacecraft: Correlations between Ulysses and Wind interstellar dust detections
Horanyi, Mihaly; Andersson, Laila; Malaspina, David M. +1 more
The Wind spacecraft is positioned just sunward of Earth at the first Lagrange point, while the Ulysses spacecraft orbits above and below the ecliptic plane crossing the ecliptic as far from the Sun as the orbit of Jupiter (∼5 AU). While Wind does not carry a dedicated dust detector, we demonstrate the ability of Wind electric field measurements to…
Discovery of a quasi-periodic oscillation in the ultraluminous X-ray source IC 342 X-1: XMM-Newton results
Agrawal, V. K.; Nandi, Anuj
We report the discovery of a quasi-periodic oscillation (QPO) at 642 mHz in an XMM-Newton observation of the ultraluminous X-ray source (ULX) IC 342 X-1. The QPO has a centroid at νQPO = 642 ± 20 mHz, a coherence factor Q = 11.6 and an amplitude (rms) of 4.1 per cent with significance of 3.6σ. The energy dependence study shows that the …
Evolution of mid-infrared galaxy luminosity functions from the entire AKARI NEP deep field with new CFHT photometry
Goto, Tomotsugu; Kim, Seong Jin; Burgarella, Denis +22 more
We present infrared (IR) galaxy luminosity functions (LFs) in the AKARI North Ecliptic Pole (NEP) deep field using recently-obtained, wider Canada-France-Hawaii Telescope (CFHT) optical/near-IR images. AKARI has obtained deep images in the mid-infrared (IR), covering 0.6 deg2 of the NEP deep field. However, our previous work was limited…