Search Publications
Evidence of mud volcanism due to the rapid compaction of Martian tsunami deposits in southeastern Acidalia Planitia, Mars
Costard, François; Séjourné, Antoine; Di Pietro, Ilaria +2 more
Thumbprint terrain was first recognized in Viking Orbiter data and described as sets of alternating continuous parallel ridges and depressions up to several tens of kilometres in length, with high and low albedo respectively. We performed a geomorphological analysis of these features using both Context Camera and High Resolution Imaging Science Ex…
A detailed understanding of the rotation-activity relationship using the 300 Myr old open cluster NGC 3532
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +2 more
Context. The coeval stars of young open clusters provide insights into the formation of the rotation-activity relationship that elude studies of multi-age field populations.
Aims: We measure the chromospheric activity of cool stars in the 300 Myr old open cluster NGC 3532 in concert with their rotation periods to study the mass-dependent morp…
Thin Current Sheet Behind the Dipolarization Front
Russell, C. T.; Escoubet, C. P.; Fazakerley, A. N. +18 more
We report a unique conjugate observation of fast flows and associated current sheet disturbances in the near-Earth magnetotail by MMS (Magnetospheric Multiscale) and Cluster preceding a positive bay onset of a small substorm at ∼14:10 UT, September 8, 2018. MMS and Cluster were located both at X ∼ −14 RE. A dipolarization front (DF) of …
Spectral properties of lunar impact melt deposits from Moon Mineralogy Mapper (M3) data
Tornabene, L. L.; Neish, C. D.; Cannon, K. M. +3 more
Lunar impact melt deposits have unusual surface properties, unlike any measured terrestrial lava flow. Radar observations suggest that they are incredibly rough at decimeter scales, but they appear smooth in high-resolution, meter-scale optical images. The cause of their unusual surface roughness is unknown. In this work, we investigate the proper…
Statistical Survey of Reservoir Phenomenon in Energetic Proton Events Observed by Multiple Spacecraft
Wang, Yang; Lyu, Dan; Xiao, Boxi +3 more
In this work, reservoir phenomenon in the decay phase of gradual solar energetic particle (SEP) events are investigated with two Helios and the IMP 8 spacecraft from 1976 January to 1980 March and two STEREO and the SOHO spacecraft from 2010 January to 2014 September. Using these data, 62 reservoir events of solar energetic protons were identified…
The spatially offset quasar E1821+643: new evidence for gravitational recoil
Jadhav, Yashashree; Robinson, Andrew; Almeyda, Triana +2 more
A galaxy merger is expected to cause the formation of a supermassive black hole (SMBH) binary, which itself eventually coalesces through the anisotropic emission of gravitational waves. This may result in the merged SMBH receiving a recoil kick velocity ~100-1000 kms-1, causing it to oscillate in the gravitational potential of the host …
No Activity among 13 Centaurs Discovered in the Pan-STARRS1 Detection Database
Wainscoat, Richard J.; Lilly, Eva; Hsieh, Henry +5 more
Centaurs are small bodies orbiting in the giant planet region that were scattered inward from their source populations beyond Neptune. Some members of the population display comet-like activity during their transition through the solar system, the source of which is not well understood. The range of heliocentric distances where the active Centaurs…
Size and Shape of (11351) Leucus from Five Occultations
Dunham, David W.; Dunham, Joan B.; Lauer, Tod R. +76 more
We present observations of five stellar occultations for (11351) Leucus and reports from two efforts on (21900) Orus. Both objects are prime mission candidate targets for the Lucy Discovery mission. Combined results for Leucus indicate a very dark surface with pV = 0.037 ± 0.001, which is derived from the average of the multichord occul…
Nitrogen X-ray absorption in the local ISM
García, Javier A.; Gatuzz, Efrain; Kallman, Timothy R.
Nitrogen is one of the most abundant metals in the interstellar medium (ISM), and thus it constitutes an excellent test to study a variety of astrophysical environments, ranging from nova to active galactic nuclei. We present a detailed analysis of the gaseous component of the N K-edge using high-resolution XMM-Newton spectra of 12 Galactic and 40…
Linear spectropolarimetric analysis of fairall 9 with VLT/FORS2
Mazzei, Paola; D'Onofrio, Mauro; Czerny, Bożena +10 more
The quasar main sequence appears to be an incredibly powerful tool to organize the diversity in large samples of type-1 quasars but the most important physical parameters governing it are still unclear. Here, we investigate the origin of the broadening and of a defining feature of Population B sources: a strong redward asymmetry of the Balmer emis…