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HD-TESS: An Asteroseismic Catalog of Bright Red Giants within TESS Continuous Viewing Zones
Huber, Daniel; Stello, Dennis; Hon, Marc +2 more
We present HD-TESS, a catalog of 1709 bright (V ~ 3-10) red giants from the Henry Draper (HD) Catalog with asteroseismic measurements based on photometry from NASA's Transiting Exoplanet Survey Satellite (TESS). Using light curves spanning at least 6 months across a single TESS observing cycle, we provide measurements of global asteroseismic param…
Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3
López-Corredoira, M.; Chrobáková, Ž.; Nagy, R.
Context. The outer Galactic disc contains some features such as the warp and flare, whose origin is still debated. The Gaia data provide an excellent opportunity to probe the Galactic disc at large distances and study these features.
Aims: We derive the density distributions of the average (old) whole population and the supergiants (represent…
Neutron-capture elements record the ordered chemical evolution of the disc over time
Buder, Sven; Ness, Melissa K.; Horta, Danny +2 more
An ensemble of chemical abundances probing different nucleosynthetic channels can be leveraged to build a comprehensive understanding of the chemical and structural evolution of the Galaxy. Using GALAH DR3 data, we seek to trace the enrichment by the supernovae Ia, supernovae II, asymptotic giant branch stars, and neutron-star mergers and/or colla…
The Dark Energy Survey Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5000 Square Degree Footprint
Bechtol, K.; Smith, M.; Abbott, T. M. C. +79 more
We report the combined results of eight searches for strong gravitational lens systems in the full 5000 square degrees of Dark Energy Survey (DES) observations. The observations accumulated by the end of the third observing season fully covered the DES footprint in five filters (grizY), with an i-band limiting magnitude (at 10σ) of 23.44. In four …
Improving CME evolution and arrival predictions with AMR and grid stretching in Icarus
Poedts, S.; Verbeke, C.; Wijsen, N. +1 more
Context. Coronal mass ejections (CMEs) are one of the main drivers of disturbances in interplanetary space. Strong CMEs, when directed towards the Earth, cause geomagnetic storms upon interacting with the Earth's magnetic field, and can cause significant damage to our planet and affect everyday life. As such, efficient space weather prediction too…
Hard X-Ray Emission from the Eastern Jet of SS 433 Powering the W50 "Manatee" Nebula: Evidence for Particle Reacceleration
Mori, Kaya; Safi-Harb, Samar; Zhang, Shuo +12 more
We present a broadband X-ray study of W50 (the "Manatee" nebula), the complex region powered by the microquasar SS 433, that provides a test bed for several important astrophysical processes. The W50 nebula, a Galactic PeVatron candidate, is classified as a supernova remnant but has an unusual double-lobed morphology likely associated with the jet…
The Triangulum Extended (TREX) Survey: The Stellar Disk Dynamics of M33 as a Function of Stellar Age
Williams, Benjamin F.; Gilbert, Karoline M.; Chemin, Laurent +8 more
Triangulum (M33) is a low-mass, relatively undisturbed spiral galaxy that offers a new regime in which to test models of dynamical heating. In spite of its proximity, M33's dynamical heating history has not yet been well-constrained. In this work, we present the TREX Survey, the largest stellar spectroscopic survey across the disk of M33. We prese…
Serendipitous discovery of radio flaring behaviour from a nearby M dwarf with MeerKAT
Buckley, David A. H.; Osten, Rachel A.; Lintott, Chris J. +12 more
We report on the detection of MKT J174641.0-321404, a new radio transient found in untargeted searches of wide-field MeerKAT radio images centred on the black hole X-ray binary H1743-322. MKT J174641.0-321404 is highly variable at 1.3 GHz and was detected three times during 11 observations of the field in late 2018, reaching a maximum flux density…
The KOBE experiment: K-dwarfs Orbited By habitable Exoplanets. Project goals, target selection, and stellar characterization
Deleuil, M.; Aceituno, J.; Azzaro, M. +33 more
The detection of habitable worlds is one of humanity's greatest endeavors. Thus far, astrobiological studies have shown that one of the most critical components for allowing life to develop is liquid water. Its chemical properties and its capacity to dissolve and, hence, transport other substances makes this constituent a key piece in this regard.…
Near-Ultraviolet Continuum Modeling of the 1985 April 12 Great Flare of AD Leo
Kowalski, Adam F.
White-light stellar flares are now reported by the thousands in long-baseline, high-precision, broad-band photometry from missions like \emph{Kepler}, K2, and TESS. These observations are crucial inputs for assessments of biosignatures in exoplanetary atmospheres and surface ultraviolet radiation dosages for habitable zone planets around low-mass …