Search Publications
Has the impact flux of small and large asteroids varied through time on Mars, the Earth and the Moon?
Benedix, Gretchen K.; Lagain, Anthony; Kreslavsky, Mikhail +6 more
The impact flux over the last 3 Ga in the inner Solar System is commonly assumed to be constant through time due to insufficient data to warrant a different choice for this range of time. However, asteroid break-up events in the main belt may have been responsible for cratering spikes over the last ∼2 Ga on the Earth-Moon system. Due to its proxim…
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…
The Photo-Astrometric vertical tracer density of the Milky Way - I. The method
Everall, Andrew; Boubert, Douglas; Grand, Robert J. J. +2 more
We introduce a method to infer the vertical distribution of stars in the Milky Way using a Poisson likelihood function, with a view to applying our method to the Gaia catalogue. We show how to account for the sample selection function and for parallax measurement uncertainties. Our method is validated against a simulated sample drawn from a model …
Deep uGMRT observations of the ELAIS-North 1 field: statistical properties of radio-infrared relations up to z 2
Datta, Abhirup; Basu, Aritra; Sinha, Akriti +1 more
Comprehending the radio-infrared (IR) relations of the faint extragalactic radio sources is important for using radio emission as a tracer of star formation in high redshift (z) star-forming galaxies (SFGs). Using deep uGMRT observations of the ELAIS-N1 field in the 0.3-0.5 GHz range, we study the statistical properties of the radio-IR relations a…
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…
X-raying the Sco-Cen OB association: The low-mass stellar population revealed by eROSITA
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument on board the Spectrum-Roentgen-Gamma observatory of the Sco-Cen OB association. Bona fide Sco-Cen member stars are young and are therefore expected to emit X-rays at the saturation level. The sensitivity limit of eRASS1 makes these stars detectabl…
A Climatology of Long-Duration High 2-MeV Electron Flux Periods in the Outer Radiation Belt
Artemyev, A. V.; Agapitov, O. V.; Mourenas, D. +1 more
Since the advent of the Space Age, the importance of understanding and forecasting relativistic electron fluxes in the Earth's radiation belts has been steadily growing due to the threat that such particles pose to satellite electronics. Here, we provide a model of long-duration periods of high time-integrated 2-MeV electron flux deep inside the o…
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…
Analysis of multiscale structures at the quasi-perpendicular Venus bow shock. Results from Solar Orbiter's first Venus flyby
Maksimovic, M.; Bale, S. D.; Chust, T. +23 more
Context. Solar Orbiter is a European Space Agency mission with a suite of in situ and remote sensing instruments to investigate the physical processes across the inner heliosphere. During the mission, the spacecraft is expected to perform multiple Venus gravity assist maneuvers while providing measurements of the Venusian plasma environment. The f…
Seimei KOOLS-IFU mapping of the gas and dust distributions in Galactic planetary nebulae: the case of IC 2165
Otsuka, Masaaki
We investigated the physical and chemical properties of the gas and dust components in a carbon-rich planetary nebula (PN) IC 2165 using two-dimensional emission-line maps with superior resolution. The extinction map is generated in a self-consistent and assumption-free manner. The circumstellar gas-to-dust mass ratio (GDR) map ranges radially fro…