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A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space telescopes can achieve high photometric accuracy as they are not affected by atmospheric scintillat…
Quasi-periodic whispers from a transient ULX in M 101: signatures of a fast-spinning neutron star?
Soria, Roberto; Pintore, Fabio; Esposito, Paolo +7 more
We have studied the unusual time variability of an ultraluminous X-ray source in M 101, 4XMM J140314.2 + 541806 (henceforth, J1403), using Chandra and XMM-Newton data. Over the last two decades, J1403 has shown short-duration outbursts with an X-ray luminosity ~1-3 × 1039 erg s-1, and longer intervals at luminosities ~0.5-1 ×…
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…
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…