Search Publications
The Curious Case of the "Heartworm" Nebula
Heywood, I.; Camilo, F.; Predehl, P. +9 more
The curious Galactic features near G357.2-0.2 were observed with the MeerKAT radio interferometer array in the UHF and L bands (0.56-1.68 GHz). There are two possibly related features: a newly identified faint heart-shaped partial shell (the "heart"), and a series of previously known but now much better imaged narrow, curved features (the "worm") …
Dust Mass Associated with the Supernova Remnant IC 443 When Emission Meets Extinction
Jiang, Biwei; Zhao, He; Li, Jun
The dust mass of the well-known supernova remnant IC 443 is estimated from both the infrared emission and the visual extinction. With photometry to the images taken by Spitzer, WISE, IRAS, AKARI, and Planck, the spectral energy distribution (SED) of the dust is obtained after subtracting synchrotron radiation and considering the spectral line emis…
Dynamical Origin for the Collinder 132-Gulliver 21 Stream: A Mixture of Three Comoving Populations with an Age Difference of 250 Myr
Tang, Shih-Yun; Pang, Xiaoying; Wang, Long +6 more
We use Gaia DR3 data to study the Collinder 132-Gulliver 21 region via the machine-learning algorithm STARGO and find eight subgroups of stars (ASCC 32, Collinder 132 gp 1-6, Gulliver 21) located in close proximity. Three comoving populations were identified among these eight subgroups: (i) a coeval 25 Myr old moving group (Collinder 132), (ii) an…
Convolutional Neural Networks for Searching Superflares from Pixel-level Data of the Transiting Exoplanet Survey Satellite
Tu, Zuo-Lin; Wang, F. Y.; Wu, Qin +3 more
In this work, six convolutional neural networks (CNNs) have been trained based on 15,638 superflare candidates on solar-type stars, which are collected from the three years of Transiting Exoplanet Survey Satellite (TESS) observations. These networks are used to replace the manually visual inspection, which was a direct way of searching for superfl…
Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
Light bridges (LBs) are among the most striking substructures in sunspots, where various activities have been revealed by recent high-resolution observations from the Interface Region Imaging Spectrograph (IRIS). Based on the variety of their physical properties, we classified these activities into four distinct categories: transient brightening (…
Searching for Stellar and Planetary Emission in Large Field-of-view Radio Sky Surveys
Lazio, T. Joseph W.; Isella, Andrea; Ling, Jason +1 more
Detection of low-frequency (≤1.4 GHz) radio emission from stellar and planetary systems can lead to new insights into stellar activity, extrasolar space weather, and planetary magnetic fields. In this work, we investigate three large field-of-view surveys at 74 MHz, 150 MHz, and 1.4 GHz, as well as a myriad of multiwavelength ancillary data, to se…
Implications of High-density, High-temperature Ridges Observed in Some Two-ribbon Flares
Qiu, Jiong; Longcope, Dana
Several two-ribbon solar flares observed on the disk, notably including the Bastille flare of 2000 July 14, show an extended ridge of plasma running along the loop tops of the post-reconnection arcade. In that and two more recent examples, the ridge is visible in emission by Fe XXIV at roughly 17 MK, with a high, steadily increasing emission measu…
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 …
Toward Understanding the B[e] Phenomenon. VIII. Nature and Variability of IRAS 07080+0605
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +13 more
We report the results of spectroscopic and photometric observations of the emission-line object IRAS 07080+0605 carried out in 2004-2021. We found that the object is significantly underluminous for its spectroscopic properties (T eff = 8500 ± 500 K, $\mathrm{log}$ g = 2.0 ± 0.5), if a strong visual attenuation by a factor of ~43 found t…
Remote Sensing of Coronal Forces during a Solar Prominence Eruption
Thompson, B. J.; DeVore, C. R.; Uritsky, V. M.
We present a new methodology-the Keplerian Optical Dynamics Analysis (KODA)-for quantifying the dynamics of erupting magnetic structures in the solar corona. The technique involves adaptive spatiotemporal tracking of propagating intensity gradients and their characterization in terms of time-evolving Keplerian areas swept out by the position vecto…