Search Publications
Rovibrational Spectral Analysis of CO3 and C2O3: Potential Sources for O2 Observed in Comet 67P/Churyumov-Gerasimenko
Fortenberry, Ryan C.; Peters, Daniel; Ferrari, Brian C. +1 more
The recent ROSETTA mission to comet 67P/Churyumov-Gerasimenko detected surprisingly high levels of molecular oxygen (O2; hypervolatile species) in the coma. Current models predict that considerable levels of other hypervolatiles (such as molecular nitrogen, N2, methane, CH4, and Argon) should be found at similar le…
Secondary Radio and X-Ray Emissions from Galaxy Mergers
Murase, Kohta; Mészáros, Peter; Yuan, Chengchao
Shocks arising in galaxy mergers could accelerate cosmic-ray (CR) ions to TeV-PeV energies. While propagating in the intergalactic medium, these CRs can produce high-energy neutrinos, electron-positron pairs, and gamma-rays. In the presence of intergalactic magnetic fields, the secondary pairs will radiate observable emissions through synchrotron …
X-ray and optical observations of the black hole candidate MAXI J1828-249
Makishima, Kazuo; Ueda, Yoshihiro; Itoh, Ryosuke +8 more
We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249 performed with Suzaku and the Kanata telescope around the X-ray flux peak in the 2013 outburst. The time-averaged X-ray spectrum covering 0.6-168 keV was approximately characterized by a strong multi-color disk blackbody component with an inne…
Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars
Quanz, S. P.; Apai, D.; Ségransan, D. +3 more
Context. Nearby stars are prime targets for exoplanet searches and characterization using a variety of detection techniques. Combining constraints from the complementary detection methods of high-contrast imaging (HCI) and radial velocity (RV) can further constrain the planetary architectures of these systems because these methods place limits at …
Realization of a multifrequency celestial reference frame through a combination of normal equation systems
Nothnagel, A.; Karbon, M.
Context. We present a celestial reference frame (CRF) based on the combination of independent, multifrequency radio source position catalogs using nearly 40 years of very long baseline interferometry observations at the standard geodetic frequencies at SX band and about 15 years of observations at higher frequencies (K and XKa). The final catalog …
L1 Stream Deflection and Ballistic Launching at the Disk Bow Shock: An Absorption-line Velocity Analysis in Semi-detached Binaries
Godon, Patrick
Observations of semi-detached interacting binaries reveal orbital modulation in the optical, UV, and X-ray bands, indicating the presence of absorbing material obscuring the disk and accreting primary star at specific orbital phases consistent with L1 stream material overflowing the disk edge. We simulate the L1 stream interaction with the disk us…
The M3 project: 1- A global hyperspectral image-cube of the Martian surface
Bibring, J. -P.; Gondet, B.; Poulet, F. +3 more
This paper is the first paper of a series that will present the derivation of the modal mineralogy of Mars (M3 project) at a global scale from the near-infrared dataset acquired by the imaging spectrometer OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) on board ESA/Mars Express. The objective is to create and …
Swift UVOT observations of the 2015 outburst of V404 Cygni
Altamirano, D.; Knigge, C.; Page, M. J. +10 more
The black hole binary, V404 Cygni, went into outburst in 2015 June, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observations obtained with the Swift X-ray Telescope. We fi…
Seismic signal from waves on Titan's seas
Lorenz, Ralph D.; Stähler, Simon C.; Panning, Mark P. +4 more
Seismology is the main tool for inferring the deep interior structures of Earth and potentially also of other planetary bodies in the solar system. Terrestrial seismology is influenced by the presence of the ocean-generated microseismic signal, which sets a lower limit on the earthquake detection capabilities but also provides a strong energy sour…
A catalog of DB white dwarfs from the LAMOST DR5 and construction of templates
Luo, A. -Li; Kong, Xiao; Li, Xiang-Ru
In this study, we employ machine learning to build a catalog of DB white dwarfs (DBWDs) from the LAMOST Data Release (DR) 5. Using known DBs from SDSS DR14, we selected samples of high-quality DB spectra from the LAMOST database and applied them to train the machine learning process. Following the recognition procedure, we chose 351 DB spectra of …