NASA | JPL-Caltech | Spitzer | ARC | Kepler | 2015 Dec 10
[c][youtube]https://www.youtube.com/watch?v=4NgMVySq_2A[/youtube]Cool Star Marked by Long-Lived Storm Animation - Credit: NASA/JPL-Caltech[/c][hr][/hr]Astronomers have discovered what appears to be a tiny star with a giant, cloudy storm, using data from NASA's Spitzer and Kepler space telescopes. The dark storm is akin to Jupiter's Great Red Spot: a persistent, raging storm larger than Earth.
"The star is the size of Jupiter, and its storm is the size of Jupiter's Great Red Spot," said John Gizis of the University of Delaware, Newark. "We know this newfound storm has lasted at least two years, and probably longer." Gizis is the lead author of a new study appearing in The Astrophysical Journal.
While planets have been known to have cloudy storms, this is the best evidence yet for a star that has one. The star, referred to as W1906+40, belongs to a thermally cool class of objects called L-dwarfs. Some L-dwarfs are considered stars because they fuse atoms and generate light, as our sun does, while others, called brown dwarfs, are known as "failed stars" for their lack of atomic fusion.
The L-dwarf in the study, W1906+40, is thought to be a star based on estimates of its age (the older the L-dwarf, the more likely it is a star). Its temperature is about 3,500 degrees Fahrenheit (2,200 Kelvin). That may sound scorching hot, but as far as stars go, it is relatively cool. Cool enough, in fact, for clouds to form in its atmosphere. ...
Kepler Monitoring of an L Dwarf II. Clouds with Multiyear Lifetimes - John E. Gizis et al
- Astrophysical Journal 813(2):104 (2015 Nov 10) DOI: 10.1088/0004-637X/813/2/104
arXiv.org > astro-ph > arXiv:1509.07186 > 25 Sep 2015