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Antarctic Survey Telescope 3-3: Overview, System Performance and Preliminary Observations at Yaoan, Yunnan
Wang, Lifan; Hu, Lei; Hu, Maokai +17 more
The third Antarctic Survey Telescope array instrument at Dome A in Antarctica, the AST3-3 telescope, has been in commissioning from March 2021. We deployed AST3-3 at the Yaoan astronomical station in Yunnan Province for an automatic time-domain survey and follow-up observations with an optimised observation and protection system. The telescope sys…
Deep-learning Reconstruction of Sunspot Vector Magnetic Fields for Forecasting Solar Storms
Dhuri, Dattaraj B.; Bhattacharjee, Shamik; Hanasoge, Shravan M. +1 more
Solar magnetic activity produces extreme solar flares and coronal mass ejections, which pose grave threats to electronic infrastructure and can significantly disrupt economic activity. It is therefore important to appreciate the triggers of explosive solar activity and develop reliable space weather forecasting. Photospheric vector magnetic field …
The Discovery of New Binary Systems Using Value-added Catalogs and TESS Data
Carrell, Kenneth; Gray Cherry, Jackie; Gillespie, Charles
Using potentially variable sources flagged in value-added catalogs created by combining data from the Gaia, IPHAS, and KIS surveys, we utilized data from TESS, McDonald Observatory, and the Southern Plains Private Observatory to confirm and identify four of these potentially variable sources as eclipsing binaries. Combining large data sets and obt…
Investigating datasets with high IRIS burst prevalence
Kleint, L.; Nelson, C. J.
Context. Approximately 0.01% of all Si IV 1394 Å spectra sampled in 2013 and 2014 by the Interface Region Imaging Spectrograph (IRIS) have IRIS burst profiles. However, these events are not evenly distributed across datasets with 19.31% of these spectra being identified in only six (of more than 3500) rasters.
Aims: Here, we investigate five …
X-ray views of our solar system
Branduardi-Raymont, Graziella
Relation between Magnetosonic Waves and Pitch Angle Anisotropy of Warm Protons
Li, W.; Jaynes, A. N.; Ma, Q. +3 more
In the past decade, many observations of transversely heated low energy protons were reported in the inner magnetosphere. Interestingly, most of the time heated protons were observed along with magnetosonic waves. Due to the strong correlation, it was often assumed that magnetosonic waves were responsible for the heating of low energy protons. By …
OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +38 more
We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by the Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes. The event is caused by a giant source star in the Galactic Bulge passing over a large resonant binary-lens caustic. The availability of space-based data allows the…
Local Volume dwarf KK242: radial velocity, SF region, and metallicity
Burenkov, A. N.; Malygin, E. A.; Makarova, L. N. +5 more
KK242 is a LV dwarf of transition type residing in the void environment. Koda et al. present clear indications on its connection with Scd galaxy NGC 6503. This implies the distance to KK242 of ~6.3 Mpc and its MB = -10.5 mag. Its radial velocity, known from the Effelsberg radio telescope H I observations, reveals, however, the differenc…
New Semiregular Variable Star Near The Wizard Nebula - Evolution of the Red Giant MACOMP_V1
Moriconi, M.; Conzo, G.; Marotta, P. G.
The red giant MaCoMP_V1 in Cepheus at coordinates RA (J2000) 22:49:05:49 and DEC (J2000) +57:52:41:6 is a semiregular variable star classified as SRS, number 2225960 in the AAVSO VSX database. Using the Fourier transform, the period P = 24.751(0.062)d was evaluated and, with the support of the ASAS-SN and ZTF surveys, a well-defined light curve wa…
Assessment of Dark Matter Models Using Dark Matter Correlations across Dwarf Spheroidal Galaxies
Borzou, Ahmad
The predicted size of dark matter substructures in kilo-parsec scales is model-dependent. Therefore, if the correlations between dark matter mass densities as a function of the distances between them are measured via observations, we can scrutinize dark matter scenarios. In this paper, we present an assessment procedure of dark matter scenarios. F…