Search Publications
Morphometry and kinematics correlation of wrinkle ridges on Mars: Insights from Trishear modelling
Carboni, F.; Karagoz, O.; Kenkmann, T.
Wrinkle ridges are among the most common and controversial compressional tectonic structures on terrestrial planets. While their origins are well inferred to be related to crustal shortening driven by compressional stress, their subsurface characterization is still a matter of debate. Open questions remain about the geometry, number, structural st…
Photometric and Spectroscopic Investigations of Three Large Amplitude Contact Binaries
Li, Kai; Gao, Xing; Liu, Fei +8 more
We performed photometric and spectroscopic studies of three large amplitude contact binaries: NSVS 2418361, ATLAS J057.1170+31.2384, and NSVS 7377875. The amplitudes of these three systems' light curves are more than 0.7 mag. We analyzed the light curves using the Wilson–Devinney code to yield physical parameters. The photometric solutions suggest…
Extragalactic magnetar giant flare GRB 231115A: Insights from Fermi/GBM observations
Goldstein, Adam; Kouveliotou, Chryssa; Younes, George +22 more
Magnetar giant flares (MGFs) are the extremely short, energetic transients originating from highly magnetized neutron stars. When observed in nearby galaxies, these rare events are nearly indistinguishable from cosmological short gamma-ray bursts. We present the analysis of GRB 231115A, a candidate extragalactic MGF observed by Fermi/GBM and local…
Inversion of ultraviolet occultation profiles in a dusty atmosphere: Analytic and numerical methods
Gérard, J. -C.; Hubert, B.; Soret, L. +4 more
Over the last two decades, important efforts have been undertaken by the most prominent space agencies to explore and analyze the interior, ground and atmosphere of Mars. A series of remote sensing instruments have been deployed and operated to characterize the atmospheric composition and dynamics. Several techniques have been used including solar…
25 years of XMM-Newton observations of the Sgr A complex: 3D distribution and internal structure of the clouds
Haardt, Francesco; Ponti, Gabriele; Stel, Giovanni +1 more
Context. Sgr A⋆, the supermassive black hole at the center of the Milky Way, is currently very faint. However, X-ray radiation reflected by the Sgr A complex, a group of nearby molecular clouds, suggests that it went through one or more periods of high activity some hundreds of years ago. Aims. We aim to determine whether previously pro…
Evidence for Primordial Alignment II: Insights from Stellar Obliquity Measurements for Hot Jupiters in Compact Multiplanet Systems
Rice, Malena; Zhou, George; Huang, Chelsea X. +5 more
A significant fraction of hot Jupiters have orbital axes misaligned with their host stars' spin axes. The large stellar obliquities of these giants have long been considered potential signatures of high-eccentricity migration, which is expected to clear out any nearby planetary companions. This scenario requires that only isolated hot Jupiters be …
A Search for the O'Connell Effect in Contact Binaries in the Era of Big Sky Surveys. I.
Christopoulou, Panagiota-Eleftheria; Papageorgiou, Athanasios; Kleftogiannis, Georgios D.
Asymmetries between the two maxima of the light curves of contact binaries, known as the O'Connell effect, have been identified using the All Sky Automated Survey, All-Sky Automated Survey for Supernovae, Northern Sky Variability Survey, Optical Gravitational Lensing Experiment, and Optical Monitoring Camera sky surveys. The morphology of the mean…
Photolysis and Sublimation Chemistry of Ammonium Cyanide with Relevance to Cometary Environments
Gerakines, P. A.; Milam, S. N.; Yocum, K. M. +3 more
Bulk nitrogen is depleted in solar system objects, including the terrestrial planets, chondritic meteorites, and comets. Recently, it was suggested that cometary nitrogen may be locked up in ammonium salts—ionic solids comprising ammonia (NH3) and an acid such as hydrogen cyanide (HCN)—based on Rosetta/ROSINA data from comet 67P/Churyum…
Unveiling the infrared excess of SIPS J2045-6332: evidence for a young stellar object with potential low-mass companion
Meisner, Aaron M.; Kirkpatrick, J. Davy; Burgasser, Adam J. +16 more
The Disc Detective project, a citizen science initiative, aims to identify circumstellar discs around stars by detecting objects with infrared (IR) excess using data from the Wide-field Infrared Survey Explorer (WISE). In this study, we investigate SIPS J2045-6332, a potential brown dwarf with significant IR excess in WISE and Two Micron All Sky S…
The Membership and Age of the Planet-hosting Young Star IRAS 04125+2902
Luhman, K. L.
A transiting planet was recently discovered around a star in the Taurus star-forming region, IRAS 04125+2902, making it one of the youngest known planets. The discovery paper cited two age estimates for IRAS 04125+2902, one based on a comparison to two sets of model isochrones in the Hertzsprung–Russell diagram and a second age reported by an earl…