Search Publications
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…
Vetting the "Lobster" Diagram: Searching for Unseen Companions in Wide Binaries Using NASA Space Exoplanet Missions
Hartman, Zachary D.; Lépine, Sébastien; Medan, Ilija
Over the past decade, the number of known wide-binary systems has expanded exponentially, thanks to the release of data from the Gaia Mission. Some of these wide-binary systems are actually higher-order multiples, where one of the components is an unresolved binary itself. One way to search for these systems is by identifying the overluminous comp…
Evidence for Parametric Decay Instability in the Lower Solar Atmosphere
Hahn, Michael; Fu, Xiangrong; Savin, Daniel Wolf
We find evidence for the first observation of the parametric decay instability (PDI) in the lower solar atmosphere. In particular, we find that the power spectrum of density fluctuations near the solar transition region resembles the power spectrum of the velocity fluctuations but with the frequency axis scaled up by about a factor of 2. These res…
2D and Slab Turbulent Cascade Rates in the Inner Heliosphere
Zank, G. P.; Zhao, L. -L.; Telloni, D. +1 more
We present a theoretical and observational study of 2D and slab turbulence cascade (or heating) rates of transverse total turbulence energies, transverse cross helicity, transverse outward and inward Elsässer energy, transverse fluctuating magnetic energy density, and transverse fluctuating kinetic energy from the perihelion of the first Parker So…
Near-infrared Spectroscopy of a Massive Young Stellar Object in the Direction toward the Galactic Center: XCN and Aromatic C-D Features
Onaka, Takashi; Sakon, Itsuki; Shimonishi, Takashi
We report near-infrared (2.5-5 µm) long-slit (~30″) spectroscopy of a young stellar object in the direction toward the Galactic center with the Infrared Camera on board the AKARI satellite. The present target is suggested to be AFGL 2006 based on its very red color and close location. The spectra show strong absorption features of H2