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CCD Photometry, Light Curve Modeling, and Period Study of the Overcontact Binary Systems V647 Virginis and V948 Monocerotis
Alton, K. B.
Prior to this investigation, monochromatic CCD data for V647 Vir and V948 Mon had only been generated from automated surveys which employ sparse sampling strategies. In this study precise multi-color (B, V, and Ic) light curve data for V647 Vir (2018) and V948 Mon (2017-2018) were acquired at Desert Bloom Observatory (DBO). Both targets…
Global Diagnostics of Ionospheric Absorption During X-Ray Solar Flares Based on 8- to 20-MHz Noise Measured by Over-the-Horizon Radars
Lester, M.; Marchaudon, A.; Marcucci, M. F. +9 more
An analysis of noise attenuation during 80 solar flares between 2013 and 2017 was carried out at frequencies 8-20 MHz using 34 Super Dual Auroral Radar Network radars and the EKB ISTP SB RAS radar. The attenuation was determined on the basis of noise measurements performed by the radars during the intervals between transmitting periods. The locati…
New phase-magnitude curves for some main belt asteroids, fit of different photometric systems and calibration of the albedo - Photometry relation
Cellino, A.; Carbognani, A.; Caminiti, S.
Results of photometric observations of a small sample of selected Main Belt asteroids are presented. The obtained measurements can be used to achieve a better calibration of the asteroid photometric system (H, G1 , G2) adopted by the IAU, and to make comparisons with best-fit curves that can be obtained using different photom…
3D thermal modeling of two selected regions on comet 67P and comparison with Rosetta/MIRO measurements
Skorov, Yuri; Macher, Wolfgang; Rezac, Ladislav +3 more
Context. The Microwave Instrument for the Rosetta Orbiter (MIRO) was one of the key instruments of the Rosetta mission, which acquired a wealth of data, in particular as the orbiter moved in the close environment of comet 67P/Churyumov-Gerasimenko (August 2014-September 2016). It was the only instrument of the Rosetta payload that was able to meas…
Multiwavelength spectroscopy of the black hole candidate MAXI J1813-095 during its discovery outburst
De Marco, B.; Armas Padilla, M.; Jiménez-Ibarra, F. +5 more
MAXI J1813-095 is an X-ray transient discovered during an outburst in 2018. We report on X-ray and optical observations obtained during this event, which indicate that the source is a new low-mass X-ray binary. The outburst lasted ∼70 d and peaked at LX(0.5-10 keV) ∼ 7.6 × 1036 erg s-1, assuming a distance of 8 kpc…
Torus Constraints in ANEPD-CXO245: A Compton-thick AGN with Double-peaked Narrow Lines
Goto, Tomotsugu; Burgarella, Denis; Tanimoto, Atsushi +18 more
We report on the torus constraints of the Compton-thick active galactic nucleus (AGN) with double-peaked optical narrow-line region emission lines, ANEPD-CXO245, at z = 0.449 in the AKARI NEP Deep Field. The unique infrared data on this field, including those from the nine-band photometry over 2-24 µm with the AKARI Infrared Camera, and the …
Stellar cusp and warm dust at the heart of NGC 1068
Rouan, D.; Gratadour, D.; Grosset, L.
Aims: Establishing precisely how stars and interstellar medium distribute within the central 100 pc area around an AGN, down to the pc scale, is key to understanding the late stages of transfer of matter onto the accretion disc.
Methods: Using adaptive optics-assisted (SPHERE-VLT) near-IR images in the H band, Ks band, and sev…
AKARI NEP field: Point source catalogs from GALEX and Herschel observations and selection of candidate lensed sub-millimeter galaxies
Goto, Tomotsugu; Burgarella, Denis; Pearson, Chris +9 more
The AKARI Wide North Ecliptic field is one of the most important cosmological fields because it lies in the continuous viewing zones for many space telescopes, e.g., Herschel, HST, and JWST, and it is also a natural high-visibility field from the L2 halo orbit. The field will be also the location of the deep survey for the Euclid mission. Finally,…
Local Time Variation in the Large-Scale Structure of Saturn's Magnetosphere
Dougherty, M. K.; Arridge, C. S.; Guio, P. +3 more
The large-scale structure of Saturn's magnetosphere is determined by internal and external factors, including the rapid planetary rotation rate, significant internal hot and cold plasma sources, and varying solar wind pressure. Under certain conditions the dayside magnetospheric magnetic field changes from a dipolar to more disk-like structure, du…
T Tauri stars in the SuperWASP and NSVS surveys
Paunzen, E.; Smalley, B.; Vaňko, M. +1 more
We present a study of the long-term optical variability of young T Tauri stars using previously unpublished data from the Super-Wide Angle Search for Planets (SuperWASP) project. Other publicly available photometry from the Northern Sky Variability Survey (NSVS) and the National Aeronautics and Space Administration (NASA) K2 mission were used to c…