Search Publications
Missions
Journals
Publication Years
Spectro-imaging forward model of red and blue galaxies
Tortorelli, Luca; Herbel, Jörg; Amara, Adam +3 more
For the next generation of spectroscopic galaxy surveys, it is important to forecast their performances and to accurately interpret their large data sets. For this purpose, it is necessary to consistently simulate different populations of galaxies, in particular Emission Line Galaxies (ELGs), less used in the past for cosmological purposes. In thi…
Low Geo-Effectiveness of Fast Halo CMEs Related to the 12 X-Class Flares in 2002
Bocchialini, K.; Schmieder, B.; Poedts, S. +4 more
It is generally accepted that extreme space weather events tend to be related to strong flares and fast halo coronal mass ejections (CMEs). In the present paper, we carefully identify the chain of events from the Sun to the Earth induced by all 12 X-class flares that occurred in 2002. In this small sample, we find an unusual high rate (58%) of sol…
More than softer-when-brighter: The X-ray powerlaw spectral variability in NGC 4051
Cai, Zheng; Kang, Jia-Lai; Cai, Zhen-Yi +3 more
The powerlaw X-ray spectra of active galactic nuclei at moderate to high accretion rates normally appear softer when they brighten, for which the underlying mechanisms are yet unclear. Utilizing XMM-Newton observations and excluding photons < 2 keV to avoid contamination from the soft excess, in this work we scrutinize the powerlaw spectral var…
Relating grain size distributions in circumstellar discs to the spectral index at millimetre wavelengths
Löhne, T.
The excess emission seen in spectral energy distributions (SEDs) is commonly used to infer the properties of the emitting circumstellar dust in protoplanetary and debris discs. Most notably, dust size distributions and details of the collision physics are derived from SED slopes at long wavelengths. This paper reviews the approximations that are c…
Carbon photochemistry at Mars: Updates with recent data
Yelle, Roger V.; Lillis, Robert J.; Lo, Daniel Y.
We provide a comprehensive characterization of the photochemistry behind atomic carbon in the Mars atmosphere. Using a one-dimensional photochemical model, with an extensive reaction list incorporating new high-resolution photodissociation cross-sections (Heays et al., 2017) and the recently experimentally confirmed CO2 + hν →C +O2…
Chromospheric activity of nearby Sun-like stars. R'HK index signature of a recent burst of star formation
Gondoin, P.
Context. The chromospheric emission in the cores of the Ca II H & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age.
Aims: I use this indicator to investigate the formation history of nearby G- and early K-type stars with origins at galactocentric distances similar to tha…
The Global Distribution of Ultralow-Frequency Waves in Jupiter's Magnetosphere
Masters, A.; Manners, H.
Jupiter's giant magnetosphere is a complex system seldom in a configuration approximating steady state, and a clear picture of its governing dynamics remains elusive. Crucial to understanding how the magnetosphere behaves on a large scale are disturbances to the system on length-scales comparable to the cavity, which are communicated by magnetohyd…
Small Bodies: Near and Far Database for thermal infrared observations of small bodies in the Solar System
Szakáts, Róbert; Marton, Gábor; Müller, Thomas +4 more
In this paper, we present the Small Bodies: Near and Far Infrared Database, an easy-to-use tool intended to facilitate the modelling of thermal emission of small bodies of the Solar System. Our database collects measurements of thermal emissions for small Solar System targets that are otherwise available in scattered sources and provides a complet…
HST/STIS Capability for Love Number Measurement of WASP-121b
Rauer, Heike; Csizmadia, Szilárd; Padovan, Sebastiano +2 more
Data from transit light curves, radial velocity, and transit timing observations can be used to probe the interiors of exoplanets beyond the mean density, by measuring the Love numbers h2 and k2. The first indirect estimate of k2 for an exoplanet from radial velocity and transit timing variation observations has be…
Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +54 more
We present the first polarimetric detection of the inner disk component around the pre-main-sequence B9.5 star HD 141569A. Gemini Planet Imager H-band (1.65 µm) polarimetric differential imaging reveals the highest signal-to-noise ratio detection of this ring yet attained and traces structure inward to 0.″25 (28 au at a distance of 111 pc). …