Search Publications
Evolution of an Emerging Anti-Hale Region and its Associated Eruptive Solar Flares in NOAA AR 12882
Xu, Zhe; Xue, Zhike; Yan, Xiaoli +3 more
Solar active regions that violate the Hale-Nicholson rule are rare, but once formed, they tend to be flare-productive. In this letter, we investigated the evolution of an anti-Hale region newly emerging from the active region AR 12882 with a regular Hale distribution. The entire active region became very active, producing two eruptive flares withi…
Disks in Nearby Young Stellar Associations Found Via Virtual Reality
Debes, John H.; Kuchner, Marc J.; Gagné, Jonathan +25 more
The Disk Detective citizen science project recently released a new catalog of disk candidates found by visual inspection of images from NASA's Wide-field Infrared Survey Explorer mission and other surveys. We applied this new catalog of well-vetted disk candidates to search for new members of nearby young stellar associations (YSAs) using a novel …
Light Deflection under the Gravitational Field of Jupiter-Testing General Relativity
Xu, Ye; Hao, Chaojie; Li, Yingjie +6 more
We measured the relative positions between two pairs of compact extragalactic sources (CESs), J1925-2219 and J1923-2104 (C1-C2) and J1925-2219 and J1928-2035 (C1-C3), on 2020 October 23-25 and 2021 February 5 (totaling four epochs), respectively, using the Very Long Baseline Array at 15 GHz. Accounting for the deflection angle dominated by Jupiter…
Kepler and TESS Observations of PG 1159-035
Oliveira da Rosa, Gabriela; Kepler, S. O.; Córsico, Alejandro H. +11 more
PG 1159-035 is the prototype of the PG 1159 hot (pre-)white dwarf pulsators. This important object was observed during the Kepler satellite K2 mission for 69 days in 59 s cadence mode and by the TESS satellite for 25 days in 20 s cadence mode. We present a detailed asteroseismic analysis of those data. We identify a total of 107 frequencies repres…
Accretion Variability of the Multiple T Tauri System VW Cha
Pál, András; Ábrahám, Péter; Kóspál, Ágnes +5 more
Classical T Tauri stars are low-mass objects that are still accreting material from the surrounding circumstellar disk. The accretion process is essential in the formation of Sun-like stars and in setting the properties of the disk at the time when planet formation occurs. We constructed a complex data set in order to examine the accretion process…
Statistical Analysis of the Distribution and Evolution of Mirror Structures in the Martian Magnetosheath
Jin, Taifeng; Lei, Li; Yiteng, Zhang +2 more
The mirror-mode structures in the Martian magnetosheath that were observed by Mars Atmosphere and Volatile Evolution during 2015-2018 are analyzed statistically. It is found that most mirror-mode events occurred close to the bow shock. Morphological categorization based on skewness of the magnetic field shows that ~46.57% of the observed mirror-mo…
Blueshifted Si IV 1402.77 Å Line Profiles in a Moving Flare Kernel Observed by IRIS
Polito, Vanessa; Dudík, Jaroslav; Lörinčík, Juraj
We analyze the spectra of a slipping flare kernel observed during the 2015 June 22 M6.5-class flare by the Interface Region Imaging Spectrograph (IRIS). During the impulsive and peak phases of the flare, loops exhibiting an apparent slipping motion along the ribbons were observed in the 131 Å channel of SDO/AIA. The IRIS spectrograph slit observed…
Measurement of the Relativistic Sunyaev-Zeldovich Correction in RX J1347.5-1145
Zitrin, Adi; Daylan, Tansu; Zemcov, Michael +8 more
We present a measurement of the relativistic corrections to the thermal Sunyaev-Zel'dovich (SZ) effect spectrum, the rSZ effect, toward the massive galaxy cluster RX J1347.5-1145 by combining submillimeter images from Herschel-SPIRE with millimeter wavelength Bolocam maps. Our analysis simultaneously models the SZ effect signal, the population of …
Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars
Ho, Shirley; Drout, Maria R.; O'Grady, Anna J. G. +4 more
Periodic variables illuminate the physical processes of stars throughout their lifetime. Wide-field surveys continue to increase our discovery rates of periodic variable stars. Automated approaches are essential to identify interesting periodic variable stars for multiwavelength and spectroscopic follow-up. Here we present a novel unsupervised mac…
To Rain or Not to Rain: Correlating GOES Flare Class and Coronal Rain Statistics
Mason, E. I.; Kniezewski, K. L.
Post-flare arcades are well-known components of solar flare evolution, which have been observed for several decades. Coronal rain, cascades of catastrophically cooled plasma, outlines the loops and provides eye-catching evidence of the recent flare. These events are acknowledged to be common, but the scientific literature does not include any stat…