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2MASS J23062928-0502285
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Title: UV Surface Habitability of the TRAPPIST-1 System
Author: J. T. O'Malley-James, L. Kaltenegger

With the discovery of rocky planets in the temperate habitable zone (HZ) of the close-by cool star TRAPPIST-1 the question of whether such planets could also harbour life arises. Potentially habitable planets around red dwarf stars can orbit in radiation environments that could cause life-sterilizing surface radiation events. UV flares from these stars are more frequent and intense than solar flares. In addition, their temperate HZs are at closer separations from the star. Here we show UV surface environment models for planets in the HZ of TRAPPIST-1 and explore the implications for life. TRAPPIST-1 has high X-ray/EUV activity, placing planetary atmospheres at risk from erosion over time. If a dense Earth-like atmosphere with a protective ozone layer exists on planets in the HZ of TRAPPIST-1, UV surface environments would be similar to Earth. However an anoxic atmosphere, or an eroded thinner atmosphere, would allow more UV to reach the surface, making surface environments hostile even to highly UV-tolerant terrestrial extremophiles. If future observations detect ozone in the atmospheres of any of the planets in the HZ of TRAPPIST-1, these would be interesting targets for the search for life. We anticipate our assay to be a starting point for in-depth exploration of stellar and atmospheric observations of the TRAPPIST-1 planets to constrain their UV-surface-habitability.

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Posts: 131433
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TRAPPIST-1b, c, d, e, f, g and h
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Ultracool Dwarf and the Seven Planets

Astronomers have found a system of seven Earth-sized planets just 40 light-years away. Using ground and space telescopes, including ESO's Very Large Telescope, the planets were all detected as they passed in front of their parent star, the ultracool dwarf star known as TRAPPIST-1. According to the paper appearing today in the journal Nature, three of the planets lie in the habitable zone and could harbour oceans of water on their surfaces, increasing the possibility that the star system could play host to life. This system has both the largest number of Earth-sized planets yet found and the largest number of worlds that could support liquid water on their surfaces.
Astronomers using the TRAPPIST-South telescope at ESO's La Silla Observatory, the Very Large Telescope (VLT) at Paranal and the NASA Spitzer Space Telescope, as well as other telescopes around the world, have now confirmed the existence of at least seven small planets orbiting the cool red dwarf star TRAPPIST-1. All the planets, labelled TRAPPIST-1b, c, d, e, f, g and h in order of increasing distance from their parent star, have sizes similar to Earth
 
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RE: TRAPPIST-1
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NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star

NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are located in an area called the habitable zone, where liquid water is most likely to thrive on a rocky planet. The system sets a new record for the greatest number of habitable zone planets found outside our solar system. Any of these seven planets could have liquid water, the key to life as we know it. The exoplanet system is called TRAPPIST-1 and is only 40 light-years away.
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TRAPPIST-1b, c, d, e, f, g and h
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Julien de Wit on the discovery of seven temperate, nearby worlds

Today, an international team including astronomers from MIT and the University of Liège in Belgium has announced the discovery of seven Earth-sized planets orbiting a nearby star just 39 light years from Earth. All seven planets appear to be rocky, and any one of them may harbor liquid water, as they are each within an area called the habitable zone, where temperatures are within a range suitable for sustaining liquid water on a planet's surface.
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RE: TRAPPIST-1
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Seven Earth-sized planets found orbiting single star

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2MASS J23062928-0502285
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Astronomers confirm TRAPPIST-1 is a single star and validate that its three transiting planets are Earth-size.

Interest in the recently-discovered TRAPPIST-1 with its three Earth-size planets is high. Astronomically speaking, at 40 light-years from Earth, the system is a hop, skip and a jump away. The star itself is a dim M-type star, which, relative to most stars, is very small and cool, but making transit detection of small planets easier.
Further detailed measurement of the planetary transits seen in TRAPPIST-1 will begin later this year when NASA's Kepler space telescope in its K2 mission will precisely monitor minute changes in the light emitted from the star for a period of about 75 days.

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TRAPPIST-1
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TRAPPIST-1, also known as 2MASS J23062928-0502285, is an ultracool dwarf star located 39.13 light-years (12.0 pc) away in the constellation Aquarius.
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