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Inspection of 19 globular cluster candidates in the Galactic bulge with the VVV survey
Minniti, D.; Ripepi, V.; Fernández-Trincado, J. G. +4 more
Context. The census of the globular clusters (GCs) in the Milky Way is still a work in progress. The advent of new deep surveys has made it possible to discover many new star clusters both in the Galactic disk and bulge, but many of these new candidates have not yet been studied in detail, leaving a veil on their true physical nature.
Aims: W…
The nova KT Eri Is a recurrent nova with a recurrence time-scale of 40-50 yr
Walter, Frederick M.; Schaefer, Bradley E.; Hounsell, Rebekah +1 more
KT Eridani was a very fast nova in 2009 peaking at V = 5.42 mag. We marshal large data sets of photometry to finally work out the nature of KT Eri. From the TESS light curve, as confirmed with our radial velocity curve, we find an orbital period of 2.61595 d. With our 272 spectral energy distributions from simultaneous BVRIJHK measures, the compan…
A Comparative Analysis of Machine-learning Models for Solar Flare Forecasting: Identifying High-performing Active Region Flare Indicators
Brandenburg, Axel; Nandy, Dibyendu; Srivastava, Nandita +9 more
Solar flares create adverse space weather impacting space- and Earth-based technologies. However, the difficulty of forecasting flares, and by extension severe space weather, is accentuated by the lack of any unique flare trigger or a single physical pathway. Studies indicate that multiple physical properties contribute to active region flare pote…
A Two Martian Years Survey of Water Ice Clouds on Mars With ACS Onboard TGO
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +7 more
The middle infrared (MIR) channel of the atmospheric chemistry suite (ACS) instrument onboard the ExoMars Trace Gas Orbiter ESA-Roscosmos mission has performed Solar occultation measurements of the Martian atmosphere in the 2.3-4.2 µm spectral range since March 2018, which now covers two Martian years (MY). We use the methodology previously …
Long-period Ap stars discovered with TESS data: The northern ecliptic hemisphere
Kurtz, D. W.; Mathys, G.; Holdsworth, D. L.
The rotation periods of the magnetic Ap stars span five to six orders of magnitude. While it is well established that period differentiation must have taken place at the pre-main sequence stage, the physical processes that lead to it remain elusive. The existence of Ap stars that have rotation periods of tens to hundreds of years is particularly i…
Cosmic Coincidences of Primordial-Black-Hole Dark Matter
Silk, Joseph; Wu, Yi-Peng; Pinetti, Elena
If primordial black holes (PBHs) contribute more than 10% of the dark matter (DM) density, their energy density today is of the same order as that of the baryons. Such a cosmic coincidence might hint at a mutual origin for the formation scenario of PBHs and the baryon asymmetry of the Universe. Baryogenesis can be triggered by a sharp transition o…
Migratory Outbursting Quasi-Hilda Object 282P/(323137) 2003 BM80
Chandler, Colin Orion; Trujillo, Chadwick A.; Oldroyd, William J.
We report that object 282P/(323137) 2003 BM80 is undergoing a sustained activity outburst, lasting over 15 months thus far. These findings stem in part from our NASA Partner Citizen Science project Active Asteroids (http://activeasteroids.net), which we introduce here. We acquired new observations of 282P via our observing campaign (Vat…
A large range of haziness conditions in hot-Jupiter atmospheres
Lavvas, Panayotis; Arfaux, Anthony
We present a study of photochemical hazes of exoplanet atmospheres based on a self-consistent model including haze microphysics, disequilibrium chemistry, and radiative feedbacks. We derive the haze properties required to match Hubble Space Telescope observations of 10 hot-Jupiters. HAT-P-12b, HD-189733b, HD-209458b, and WASP-6b require haze mass …
High-resolution, High-sensitivity, Low-frequency uGMRT View of Coma Cluster of Galaxies
Brunetti, G.; Venturi, T.; Churazov, E. M. +12 more
We present high-resolution, high-sensitivity upgraded Giant Metrewave Radio Telescope observations of the Coma cluster (A1656) at 250-500 MHz and 550-850 MHz. At 250-500 MHz, 135 sources have extensions >0.'45 (with peak-to-local-noise ratio >4). Of these, 24 sources are associated with Coma-member galaxies. In addition, we supplement this s…
Evidence in favour of density wave theory through age gradients observed in star formation history maps and spatially resolved stellar clusters
Davis, Benjamin L.; Eufrasio, Rafael; Monson, Erik B. +7 more
Quasi-stationary density wave theory predicts the existence of an age gradient across the spiral arms with a phase crossing at the corotation radius. We have examined evidence for such age gradients using star formation history (SFH) maps derived from LIGHTNING, a spectral energy distribution fitting procedure, and by using spatially resolved stel…