Search Publications
Visibility analysis of Phobos to support a science and exploration platform
Sefton-Nash, Elliot; Cardesín-Moinelo, Alejandro; Witasse, Olivier +3 more
The surfaces of the Martian moons, Phobos and Deimos may offer a stable environment for long-term operation of platforms. We present a broad assessment of potential scientific investigations, as well as strategic and operational opportunities offered by long-term operation of an instrumented lander. Studies using observations of Mars' moons, and t…
V488 Per Revisited: No Strong Mid-infrared Emission Features and No Evidence for Stellar/substellar Companions
Howard, Andrew W.; Zuckerman, B.; Song, Inseok +4 more
We present characterization of the planetary system architecture for V488 Per, the dustiest main-sequence star known with a fractional infrared luminosity of ≈16%. Far-infrared imaging photometry confirms the existence of an outer planetary system dust population with a blackbody-fit temperature of ≈130 K. Mid-infrared spectroscopy probing the pre…
Studies of emission regions of the X-ray pulsar Hercules X-1 with pulse-phase-resolved spectra observed with Suzaku
Dotani, Tadayasu; Inoue, Hajime; Kondo, Keisuke
Pulse-phase-resolved X-ray spectra of the X-ray pulsar Her X-1 observed with Suzaku are analyzed. The analysis is based on a hypothesis that the observed variations of the continuum spectra associated with the neutron star spin originate in the changes of the projection areas of the emission regions viewed from the observer, and that the spectral …
Broad-velocity-width Molecular Features in the Galactic Plane
Oka, Tomoharu; Tsujimoto, Shiho; Iwata, Yuhei +2 more
We performed a systematic search for broad-velocity-width molecular features (BVFs) in the disk part of our Galaxy by using the CO J = 1-0 survey data obtained with the Nobeyama Radio Observatory 45 m telescope. From this search, 58 BVFs were identified. In comparisons with the infrared and radio continuum images, 36 BVFs appeared to have both inf…
FPGA Design for On-Board Measurement of Intermittency From In-Situ Satellite Data
Echim, M. M.; Teodorescu, E.; Deak, N. +2 more
Intermittency is a fundamental property of space plasma dynamics, characterizing turbulent dynamical variables as well as passive scalars. Its qualitative and quantitative description from in-situ data requires an accurate estimation of the probability density functions (PDFs) of fluctuations and their moments, particularly the flatness, a normali…
Geological History of Southeastern Gorgonum Chaos, Mars: A Story of Water and Wind
Hauber, Ernst; Adeli, Solmaz; Haack, David
Gorgonum Chaos is part of the Eridania paleolake in Terra Sirenum and displays a number of prominent light-toned morphological features that bear a record of the regional climatic conditions throughout most of Martian history. Based on an intergrated analysis of orbital data, we mapped a 1,500 km2 area in the southeast of Gorgonum Chaos…
The Cushion Region and Dayside Magnetodisc Structure at Saturn
Dougherty, M. K.; Masters, A.; Achilleos, N. +1 more
A sustained quasi dipolar magnetic field between the current sheet outer edge and the magnetopause, known as a cushion region, has previously been observed at Jupiter, but not yet at Saturn. Using the complete Cassini magnetometer data, the first evidence of a cushion region forming at Saturn is shown. Only five examples of a sustained cushion are…
Overall Properties of the ICRF and Gaia-CRF
Liu, N.
The International Celestial Reference System (ICRS) now has realizations at several frequencies, all with an accuracy of several tens of mircoarcsecond (µas) level, including the International Celestial Reference Frame (ICRF) based on observations of the very long baseline interferometry (VLBI) at S/X, K, and X/Ka band, and the Gaia celestia…
Twin stars as tracers of binary evolution in the Kepler era
Çakırlı, Ömür; Hoyman, Barış; Özdarcan, Orkun +2 more
We present results of the combined photometric and spectroscopic analysis of four systems that are eclipsing binaries with a twin component (mass ratio q ≃ 1). These are exceptional tools to provide information for probing the internal structure of stars. None of the systems were previously recognized as twin binaries. We used a number of high-res…
Ice lines as the origin for the gap/ring structure in protoplanetary disks: the issue of the assumed temperature profile
Liu, Yao
Gaps and rings are commonly seen in recent high-resolution ALMA observations of protoplanetary disks. Ice lines of volatiles are one of the mechanisms proposed to explain the origin for these substructures. To examine the ice line hypothesis, literature studies usually parameterize the mid-plane temperature with the analytic formula of a passively…