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Discovery of a 150 day period in the Venus condensational clouds
Tsang, Constantine C. C.; McGouldrick, Kevin
We have analyzed the long-term regional and global variation of emitted radiance in 1.74 µ m and 2.30 µ m near infrared spectral windows in the Venus atmosphere using the medium resolution, infrared channel of the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS-M-IR) on the Venus Express spacecraft. We find a periodic variati…
Radio and X-ray properties of the source G29.37+0.1 linked to HESS J1844-030
Giacani, E.; Castelletti, G.; Petriella, A. +2 more
Aims: We report on the first detailed multiwavelength study of the radio source G29.37+0.1, which is an as-yet-unclassified object linked to the very-high-energy γ-emitting source HESS J1844-030. The origin of the multiwavelength emission toward G29.37+0.1 has not been clarified so far, leaving open the question about the physical relationshi…
Observation of a Large-scale Quasi-circular Secondary Ribbon Associated with Successive Flares and a Halo CME
Yurchyshyn, Vasyl; Chae, Jongchul; Cho, Kyuhyoun +7 more
Solar flare ribbons provide an important clue to the magnetic reconnection process and associated magnetic field topology in the solar corona. We detected a large-scale secondary flare ribbon of a circular shape that developed in association with two successive M-class flares and one coronal mass ejection. The ribbon revealed interesting propertie…
A New 3D Multi-fluid Dust Model: A Study of the Effects of Activity and Nucleus Rotation on Dust Grain Behavior at Comet 67P/Churyumov-Gerasimenko
Huang, Z.; Jia, X.; Fougere, N. +7 more
Improving our capability to interpret observations of cometary dust is necessary to deepen our understanding of the role of dust in the formation of comets and in altering the cometary environments. Models including dust grains are in demand to interpret observations and test hypotheses. Several existing models have taken into account the gas-dust…
Collisions of Terrestrial Worlds: The Occurrence of Extreme Mid-infrared Excesses around Low-mass Field Stars
Theissen, Christopher A.; West, Andrew A.
We present the results of an investigation into the occurrence and properties (stellar age and mass trends) of low-mass field stars exhibiting extreme mid-infrared (MIR) excesses ({L}{IR}/{L}* ≳ 0.01). Stars for the analysis were initially selected from the Motion Verified Red Stars (MoVeRS) catalog of photometric stars with …
ASASSN-16eg: New candidate for a long-period WZ Sge-type dwarf nova
Nogami, Daisaku; Kato, Taichi; Isogai, Keisuke +19 more
We report on our photometric observations of the 2016 superoutburst of ASASSN-16eg. This object showed a WZ Sge-type superoutburst with prominent early superhumps with a period of 0.075478(8) d and a post-superoutburst rebrightening. During the superoutburst plateau, it showed ordinary superhumps with a period of 0.077880(3) d and a period derivat…
Exploring the SDSS Data Set with Linked Scatter Plots. I. EMP, CEMP, and CV Stars
Carbon, Duane F.; Henze, Christopher; Nelson, Bron C.
We present the results of a search for extremely metal-poor (EMP), carbon-enhanced metal-poor (CEMP), and cataclysmic variable (CV) stars using a new exploration tool based on linked scatter plots (LSPs). Our approach is especially designed to work with very large spectrum data sets such as the SDSS, LAMOST, RAVE, and Gaia data sets, and it can be…
Photospheric Velocity Structures during the Emergence of Small Active Regions on the Sun
Toriumi, Shin; Khlystova, Anna
We study the plasma flows in the solar photosphere during the emergence of two small active regions, NOAA 9021 and 10768. Using Solar and Heliospheric Observatory/Michelson Doppler Imager data, we find that the strong plasma upflows appear at the initial stage of active region formation, with maximum upflow velocities of -1650 and -1320 m s-1…
Low-ℓ CMB from string-scale SUSY breaking?
Sagnotti, A.
Models of inflation are instructive playgrounds for supersymmetry (SUSY) breaking in Supergravity and String Theory. In particular, combinations of branes and orientifolds that are not mutually BPS can lead to brane SUSY breaking, a phenomenon where nonlinear realizations are accompanied, in tachyon-free vacua, by the emergence of steep exponentia…
Searching for initial stage of massive star formation around the H II region G18.2-0.3
Zhang, Chuan-Peng; Wang, Jun-Jie; Yuan, Jing-Hua +6 more
Sometimes, early star formation can be found in cold and dense molecular clouds, such as an infrared dark cloud. Considering that star formation often occurs in clusters, H II regions may be triggering a new generation of star formation, so we can search for the initial stage of massive star formation around H II regions. Based on the above, this …