Search Publications
Calibration of NOMAD on ESA's ExoMars Trace Gas Orbiter: Part 2 - The Limb, Nadir and Occultation (LNO) channel
Vandaele, Ann Carine; Neefs, Eddy; Aoki, Shohei +19 more
The Nadir and Occultation for MArs Discovery (NOMAD) instrument is a 3-channel spectrometer suite on the ESA ExoMars Trace Gas Orbiter. Since April 2018, when the nominal science mission began, it has been measuring the constituents of the Martian atmosphere. NOMAD contains three separate spectrometers, two of which operate in the infrared: the So…
Estimation of Nitrogen-to-Iron Abundance Ratios from Low-Resolution Spectra
Beers, Timothy C.; Lee, Young Sun; Masseron, Thomas +1 more
We present a method to determine nitrogen abundance ratios with respect to iron ([N/Fe]) from molecular CN-band features observed in low-resolution (R ∼ 2000) stellar spectra obtained by the Sloan Digital Sky Survey (SDSS) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Various tests are carried out to check the systema…
Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario
Vincent, Jean-Baptiste; Campo Bagatin, Adriano; Benavidez, Paula G. +2 more
Any early or late dynamical instability in the outer Solar system should have left their footprint on the trans-Neptunian object (TNO) populations. Here, we study the collisional and dynamical evolution of such populations numerically by an updated version of ALICANDEP, which suitably takes into account the onset of an early dynamical instability.…
A Multiwavelength Study of the Sgr B Region: Contiguous Cloud-Cloud Collisions Triggering Widespread Star Formation Events?
Fukui, Yasuo; Enokiya, Rei
The Sgr B region, including Sgr B1 and Sgr B2, is one of the most active star-forming regions in the Galaxy. Hasegawa et al. originally proposed that Sgr B2 was formed by a cloud-cloud collision (CCC) between two clouds with velocities of ~45 km s-1 and ~75 km s-1. However, some recent observational studies conflict with this…
Call and Response: A Time-resolved Study of Chromospheric Evaporation in a Large Solar Flare
Milligan, Ryan O.; McAteer, R. T. James; Sellers, Sean G.
We studied an X1.6 solar flare produced by NOAA Active Region 12602 on 2014 October 22. The entirety of this event was covered by RHESSI, IRIS, and Hinode/EIS, allowing analysis of the chromospheric response to a nonthermal electron driver. We derived the energy contained in nonthermal electrons via RHESSI spectral fitting and linked the time-depe…
Populations of highly variable X-ray sources in the XMM-Newton slew survey
Saxton, R. D.; Yuan, Weimin; Starling, R. L. C. +2 more
We present the identifications of a flux-limited sample of highly variable X-ray sources on long time-scales from the second catalogue of the XMM-Newton SLew survey (XMMSL2). The carefully constructed sample, comprising 265 sources (2.5 per cent) selected from the XMMSL2 clean catalogue, displayed X-ray variability of a factor of more than 10 in 0…
Radial distribution of plasma at comet 67P. Implications for cometary flyby missions
Henri, P.; Edberg, N. J. T.; Vigren, E. +3 more
Context. The Rosetta spacecraft followed comet 67P/Churyumov-Gerasimenko (67P) for more than two years at a slow walking pace (~1 m s−1) within 1500 km from the nucleus. During one of the radial movements of the spacecraft in the early phase of the mission, the radial distribution of the plasma density could be estimated, and the ionosp…
The Effect of Light Deflection by Solar System Objects on High-precision Square Kilometre Array Astrometry
Xu, Ye; Hao, Chaojie; Li, Yingjie +4 more
We have computed the deflection angles caused by 195 objects in the solar system, including 177 satellites, and eight asteroids; 21 satellites and six asteroids can bend light from distant compact extragalactic sources by more than 0.1 µas, and 14 satellites, and the asteroid Ceres can deflect light by more than 1.0 µas. We calculated …
Insight into martian crater degradation history based on crater depth and diameter statistics
Pan, Lu; Quantin-Nataf, Cathy; Mandon, Lucia +2 more
Impact craters are widely used to investigate the geologic history of planetary surfaces. Their morphology bears clues on past surface processes that affected it such as erosion, sedimentary deposit and volcanic processes and their density is widely used to date planetary surfaces.
In this study we propose to combine crater Density and morpho…Detection of a Broad 8 µm UIR Feature in the Mid-infrared Spectrum of WR 125 Observed with Subaru/COMICS
Onaka, Takashi; Sakon, Itsuki; Williams, Peredur M. +3 more
We present the detection of a broad 8 µm feature in newly formed dust around the carbon-rich Wolf-Rayet (WC) binary WR 125 from N-band low-resolution (NL; R ~ 250) spectroscopy between 7.3 and 13.6 µm and N-band (11.7 µm) and Q-band (18.8 µm) imaging with Subaru/COMICS in 2019 October. WR 125 is a colliding-wind binary (WC7…