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Panchromatic Imaging of a Transitional Disk: The Disk of GM Aur in Optical and FUV Scattered Light
Apai, D.; Hamaguchi, K.; Henning, Th. +18 more
We have imaged GM Aurigae with the Hubble Space Telescope, detected its disk in scattered light at 1400 and 1650 Å, and compared these with observations at 3300 Å, 5550 Å, 1.1 µm, and 1.6 µm. The scattered light increases at shorter wavelengths. The radial surface brightness profile at 3300 Å shows no evidence of the 24 au radius cavit…
Kinetic models of magnetic flux ropes observed in the Earth magnetosphere
Petrukovich, A. A.; Zelenyi, L. M.; Artemyev, A. V. +3 more
Magnetic flux ropes (MFR) are universal magnetoplasma structures (similar to cylindrical screw pinches) formed in reconnecting current sheets. In particular, MFR with scales from about the ion inertial length to MHD range are widely observed in the Earth magnetosphere. Typical MFR have force-free configuration with the axial magnetic field peaking…
MATISSE: A novel tool to access, visualize and analyse data from planetary exploration missions
Antonelli, L. A.; Giommi, P.; Capria, M. T. +2 more
The increasing number and complexity of planetary exploration space missions require new tools to access, visualize and analyse data to improve their scientific return.
ASI Science Data Center (ASDC) addresses this request with the web-tool MATISSE (Multi-purpose Advanced Tool for the Instruments of the Solar System Exploration), allowing the…The Time Evolution of HH 1 from Four Epochs of HST Images
Bally, J.; Raga, A. C.; Esquivel, A. +1 more
We present an analysis of four epochs of Hα and [S II] λλ 6716/6731 Hubble Space Telescope (HST) images of HH 1. For determining proper motions, we explore a new method based on the analysis of spatially degraded images obtained convolving the images with wavelet functions of chosen widths. With this procedure, we are able to generate maps of prop…
High-contrast Imaging of Intermediate-mass Giants with Long-term Radial Velocity Trends
Henning, Thomas; Terada, Hiroshi; Usuda, Tomonori +62 more
A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects genera…
Quantifying the Interstellar Medium and Cosmic Rays in the MBM 53, 54, and 55 Molecular Clouds and the Pegasus Loop Using Fermi-LAT Gamma-ray Observations
Mizuno, T.; Okumura, A.; Fukui, Y. +4 more
A study of the interstellar medium (ISM) and cosmic rays (CRs) using Fermi Large Area Telescope (LAT) data, in a region encompassing the nearby molecular clouds MBM 53, 54, and 55 and a far-infrared loop-like structure in Pegasus, is reported. By comparing the Planck dust thermal emission model with Fermi-LAT γ-ray data, it was found that neither …
Comparison of CME/Shock Propagation Models with Heliospheric Imaging and In Situ Observations
Lu, Lei; Feng, Xueshang; Liu, Ying D. +3 more
The prediction of the arrival time for fast coronal mass ejections (CMEs) and their associated shocks is highly desirable in space weather studies. In this paper, we use two shock propagation models, I.e., Data Guided Shock Time Of Arrival (DGSTOA) and Data Guided Shock Propagation Model (DGSPM), to predict the kinematical evolution of interplanet…
Tracing back the evolution of the candidate LBV HD 168625
Mahy, L.; Waelkens, C.; Royer, P. +1 more
Context. The luminous blue variable phase is a crucial transitory phase that is not clearly understood in the massive star evolution.
Aims: We have obtained far-infrared Herschel/PACS imaging and spectroscopic observations of the nebula surrounding the candidate LBV HD 168625. By combining these data with optical spectra of the central star, …
The Comparison of Total Electron Content Between Radio and Thompson Scattering
Llebaria, A.; Lamy, P.; Jensen, E. A. +5 more
The total electron content (TEC) of the solar corona in June 2002 is calculated by three observational techniques and the results are compared. The first technique is solar rotational tomography (SRT) applied to a 14-day time series of LASCO-C2 polarized brightness images, and the other two techniques use the Cassini spacecraft radio beacon for Do…
Properties of Interstellar Medium In Infrared-bright QSOs Probed by [O I] 63 um and [C II] 158 um Emission Lines
Tsai, Chao-Wei; Zhao, Yinghe; Yan, Lin
We present a study of the interstellar medium (ISM) in the host galaxies of nine QSOs at 0.1 < z < 0.2 with black hole masses of 3× {10}7 {M}⊙ to 3× {10}9 {M}⊙ based on the far-IR spectroscopy taken with Herschel Space Observatory. We detect the [O I] 63 µm ([C II] 158 µm) emission in…