A dust pollution advisory is in effect in Pima County Tuesday: Stay indoors if possible. People with heart or lung disease are especially urged to reduce physical activity as poor air quality persists.
The Pima County Department of Environmental Quality says individuals sensitive to dust should remain indoors and away from outside air if possible, and reduce levels of physical exertion when outside. This includes children, older adult and people with heart or lung disease.
As of 10 a.m., PDEQ data showed the worst air quality in the Tucson basin in Corona de Tucson, with poor conditions also in the midtown and northwest areas near Casas Adobes. Updated conditions available on the PDEQ website. Air quality has showed signs of improvement from the 9 -10 a.m. hours:——- Anne Simmons is a digital content producer for KGUN 9. Anne got her start in television while still a student at the University of Arizona. Before joining KGUN, she managed multiple public access television stations in the Bay Area and has worked as a video producer in the non-profit sector. Share your story ideas and important issues with Anne by emailing [email protected] or by connecting on Instagram, Twitter or LinkedIn.
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A Large Double-ring Disk around the Taurus M Dwarf J04124068+2438157Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution ($\sim$50 mas, 8 au) Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and CO line emission toward the disk around the M3.5 star 2MASS J04124068+2438157. The dust disk consists only of two narrow rings at radial distances of 0.47 and 0.78 arcsec ($\sim$70 and 116 au), with Gaussian $σ$ widths of 5.6 and 8.5 au, respectively. The width of the outer ring is smaller than the estimated pressure scale height by $\sim25\%$, suggesting dust trapping in a radial pressure bump. The dust disk size, set by the location of the outermost ring, is significantly larger (by $3σ$) than other disks with similar millimeter luminosity, which can be explained by an early formation of local pressure bump to stop radial drift of millimeter dust grains. After considering the disk's physical structure and accretion properties, we prefer planet--disk interaction over dead zone or photoevaporation models to explain the observed dust disk morphology. We carry out high-contrast imaging at $L'$ band using Keck/NIRC2 to search for potential young planets, but do not identify any source above $5σ$. Within the dust gap between the two rings, we reach a contrast level of $\sim$7 mag, constraining the possible planet below $\sim$2--4 $M_{\rm Jup}$. Analyses of the gap/ring properties suggest a $\sim$Saturn mass planet at $\sim$90 au is likely responsible for the formation of the outer ring, which can be potentially revealed with JWST.
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