ESA Science & Technology - Publication Archive
- Europe to Mercury
- Mercury rising: coping with high temperatures
- Building and testing BepiColombo
- Introducing the fleet
- Meeting Mercury
- From Messenger to BepiColombo
- An international endeavour
The internal Phase 0 study of the Laser interferometer Space Antenna (LISA) mission has been performed at ESA's Concurrent Design Facility (CDF) and ran from 8 March to 5 May 2017. An internal final presentation has been prepared by the CDF Team, summarizing the outcome of the Phase 0 study. This presentation can be downloaded as a PDF (28 MB) by clicking the image to the right, or the 'link to publication' link below.
Contents of the presentation:
|p.6||CDF Study objectives||p.207||Data handling|
|p.124||Ground segment and operations||p.270||Thermal control|
|p.135||DFACS - AOCS||p.282||Risk|
|p.156||Chemical propulsion||p.306||Programmatics / AIV|
In February 2014, PLATO (PLAnetary Transits and Oscillation of stars) was selected as the M3 mission in the Cosmic Vision 2015-2025 programme. This report (also known as the Red Book) provides a high-level summary of the large number of scientific and technical documents produced as outcome of the definition study for the PLATO mission.
Outbursts occur commonly on comets with different frequencies and scales. Despite multiple observations suggesting various triggering processes, the driving mechanism of such outbursts is still poorly understood. Landslides have been invoked to explain some outbursts on comet 103P/Hartley 2, although the process required a pre-existing dust layer on the verge of failure. The Rosetta mission observed several outbursts from its target comet 67P/Churyumov–Gerasimenko, which were attributed to dust generated by the crumbling of materials from collapsing cliffs. However, none of the aforementioned works included definitive evidence that landslides occur on comets. Amongst the many features observed by Rosetta on the nucleus of the comet, one peculiar fracture, 70 m long and 1 m wide, was identified on images obtained in September 2014 at the edge of a cliff named Aswan. On 10 July 2015, the Rosetta Navigation Camera captured a large plume of dust that could be traced back to an area encompassing the Aswan escarpment. Five days later, the OSIRIS camera observed a fresh, sharp and bright edge on the Aswan cliff. Here we report the first unambiguous link between an outburst and a cliff collapse on a comet. We establish a new dust-plume formation mechanism that does not necessarily require the breakup of pressurized crust or the presence of supervolatile material, as suggested by previous studies. Moreover, the collapse revealed the fresh icy interior of the comet, which is characterized by an albedo >0.4, and provided the opportunity to study how the crumbling wall settled down to form a new talus.
The evolution of the collapse of the Aswan cliff, observed by the OSIRIS Narrow Angle Camera (NAC) and the Rosetta Navigation camera (NavCam), is shown in Fig. 1.
[Remainder of abstract truncated due to character limitations]
[Remainder of abstract truncated due to character limitations]
This is the Assessment Study Report (Yellow Book) for XIPE (X-ray Imaging Polarimetry Explorer). XIPE is a candidate mission for the M4 medium-class mission in ESA's Science Programme.
This is the Assessment Study Report (Yellow Book) for THOR (Turbulence Heating ObserveR). THOR is a candidate mission for the M4 medium-class mission in ESA's Science Programme.
This is the Assessment Study Report (Yellow Book) for ARIEL (Atmospheric Remote-sensing Infrared Exoplanet Large-survey). ARIEL is a candidate mission for the M4 medium-class mission in ESA's Science Programme.
The neutron star (NS) low-mass X-ray binary (LMXB) the Rapid Burster (RB; MXB 1730-335) uniquely shows both Type I and Type II X-ray bursts. The origin of the latter is ill-understood but has been linked to magnetospheric gating of the accretion flow. We present a spectral analysis of simultaneous Swift, NuSTAR and XMM-Newton observations of the RB during its 2015 outburst. Although a broad Fe K line has been observed before, the high quality of our observations allows us to model this line using relativistic reflection models for the first time. We find that the disc is strongly truncated at 41.8+6.7-5.3 gravitational radii (~87 km), which supports magnetospheric Type II burst models and strongly disfavours models involving instabilities at the innermost stable circular orbit. Assuming that the RB magnetic field indeed truncates the disc, we find B = (6.2 ± 1.5) × 108 G, larger than typically inferred for NS LMXBs. In addition, we find a low inclination (i=29°±2°). Finally, we comment on the origin of the Comptonized and thermal components in the RB spectrum.
Context. Before the publication of the Gaia Catalogue, the contents of the first data release have undergone multiple dedicated validation tests.
Aims. These tests aim to provide in-depth analysis of the Catalogue content in order to detect anomalies and individual problems in specific objects or in overall statistical properties, and either to filter them before the public release or to describe the different caveats on the release for an optimal exploitation of the data.
Methods. Dedicated methods using either Gaia internal data, external catalogues, or models have been developed for the validation processes. They test normal stars as well as various populations such as open or globular clusters, double stars, variable stars, and quasars. Properties of coverage, accuracy, and precision of the data are provided by the numerous tests presented here and are jointly analysed to assess the data release content.
Results. This independent validation confirms the quality of the published data, Gaia DR1 being the most precise all-sky astrometric and photometric catalogue to date. However, several limitations in terms of completeness, and astrometric or photometric quality are identified and described. Figures describing the relevant properties of the release are shown, and the testing activities carried out validating the user interfaces are also described. A particular emphasis is made on the statistical use of the data in scientific exploitation.