Search Publications
Searching for Stellar and Planetary Emission in Large Field-of-view Radio Sky Surveys
Lazio, T. Joseph W.; Isella, Andrea; Ling, Jason +1 more
Detection of low-frequency (≤1.4 GHz) radio emission from stellar and planetary systems can lead to new insights into stellar activity, extrasolar space weather, and planetary magnetic fields. In this work, we investigate three large field-of-view surveys at 74 MHz, 150 MHz, and 1.4 GHz, as well as a myriad of multiwavelength ancillary data, to se…
Geometric processing of TGO CaSSIS observations
McEwen, Alfred; Tornabene, Livio L.; Byrne, Shane +7 more
The Colour and Stereo Surface Imaging System (CaSSIS) is the scientific imager onboard the European Space Agency/Roscosmos ExoMars Trace Gas Orbiter. CaSSIS has one of the most advanced capabilities for colour imaging of the Martian surface on any spacecraft currently orbiting Mars. Such capability can only be utilized, however, by accurate geomet…
Canyon Wall and Floor Debris Deposits in Aeolis Mons, Mars
Arvidson, R. E.; Hughes, M. N.; Dietrich, W. E. +4 more
Aeolis Mons (informally, Mount Sharp) exhibits a number of canyons, including Gediz and Sakarya Valles. Poorly sorted debris deposits are evident on both canyon floors and connect with debris extending down the walls for canyon segments that cut through sulphate-bearing strata. On the floor of Gediz Vallis, debris overfills a central channel and m…
Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142
Di Folco, Emmanuel; Devinat, Marie; Habart, Émilie +4 more
Context. HD 169142 is part of the class of (pre-)transitional protoplanetary disks showing multiple carbon nanodust spectroscopic signatures (aromatic, aliphatic) dominating the infrared spectrum. Precise constraints on the spatial distribution and properties of carbonaceous dust particles are essential to understanding the physics, radiative tran…
A Re-examination of the Star Observation in Early Ming Dynasty Based on the Star Catalogue of \textit{Datong Tongzhan}-with Discussion on the Changes of Traditional Chinese Constellations
Chu, L. F.; Yang, B. S.
\textit{Datong Tongzhan} is a divination book compiled by the Imperial Board of Astronomy in early Ming dynasty, which preserves some positional data of stars observed at that time. Based on this star catalogue, a further research is carried out on star observation in early Ming dynasty. Firstly, through a deep analysis, it is found that this book…
Constructing a global ionospheric TEC map with a high spatial and temporal resolution by spherical harmonic functions
Xiong, Bo; Wang, Yuqing; Li, Xiaolin +2 more
The Massachusetts Institute of Technology (MIT) Haystack Observatory provides the ionospheric Total Electron Content (TEC) data with a temporal resolution of 5 minutes and limited spatial coverage, as they do not provide data where there are no TEC measurements. To improve the spatial coverage of MIT-TEC, we have proposed an approach for construct…
Emu: a case study for TDI-like imaging for infrared observation from space
Nordlander, Thomas; Casagrande, Luca; Ireland, Michael +14 more
A wide-field zenith-looking telescope operating in a mode similar to time-delay-integration (TDI) or drift scan imaging can perform an infrared sky survey without active pointing control, but it requires a high-speed, low-noise infrared detector. Operating from a hosted payload platform on the International Space Station (ISS), the Emu space teles…
Implications of High-density, High-temperature Ridges Observed in Some Two-ribbon Flares
Qiu, Jiong; Longcope, Dana
Several two-ribbon solar flares observed on the disk, notably including the Bastille flare of 2000 July 14, show an extended ridge of plasma running along the loop tops of the post-reconnection arcade. In that and two more recent examples, the ridge is visible in emission by Fe XXIV at roughly 17 MK, with a high, steadily increasing emission measu…
Mars and the ESA Science Programme - the case for Mars polar science
Becerra, P.; Thomas, Nicolas; Smith, I. B.
Current plans within the European Space Agency (ESA) for the future investigation of Mars (after the ExoMars programme) are centred around participation in the Mars Sample Return (MSR) programme led by NASA. This programme is housed within the Human and Robotic Exploration (HRE) Directorate of ESA. This White Paper, in response to the Voyage 2050 …
The first X-ray spectrum of the high-mass X-ray binary XTE J1855-026 during the compact object eclipse
Torrejón, J. M.; Sanjurjo-Ferrín, G.; Rodes-Roca, J. J.
We present the first XMM-Newton observation of the classical supergiant high-mass X-ray binary XTE J1855-026 taken entirely during the eclipse of the neutron star (NS), covering the orbital phases ϕ = 0.00-0.11. The analysis of the data allows us to (a) compare with the parameters obtained during the existing pre-eclipse observation and (b) explor…