The Astronomical Society of the Toms River Area
http://forum.astra-nj.org/

NASA to brag about discoveries of more exoplanets in 2 days
http://forum.astra-nj.org/viewtopic.php?f=3&t=1141
Page 1 of 1

Author:  doctorcos [ Mon Feb 20, 2017 4:29 pm ]
Post subject:  NASA to brag about discoveries of more exoplanets in 2 days

https://www.cnet.com/news/nasa-space-ex ... ra-seager/

Author:  doctorcos [ Wed Feb 22, 2017 2:16 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

A British newspaper's report on NASA's discovery:

http://www.telegraph.co.uk/science/2017 ... ment-live/

Author:  BetaDraconis [ Wed Feb 22, 2017 4:53 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

New York Times on the discovery

7 Earth-Size Planets Identified in Orbit Around a Dwarf Star

https://www.nytimes.com/2017/02/22/scie ... -nasa.html

Nature with the paper:

Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1

http://www.nature.com/nature/journal/v5 ... 21360.html

Quote:
One aim of modern astronomy is to detect temperate, Earth-like exoplanets that are well suited for atmospheric characterization. Recently, three Earth-sized planets were detected that transit (that is, pass in front of) a star with a mass just eight per cent that of the Sun, located 12 parsecs away1. The transiting configuration of these planets, combined with the Jupiter-like size of their host star—named TRAPPIST-1—makes possible in-depth studies of their atmospheric properties with present-day and future astronomical facilities1, 2, 3. Here we report the results of a photometric monitoring campaign of that star from the ground and space. Our observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1. The six inner planets form a near-resonant chain, such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.1 and 12.35 days) are near-ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inwards4, 5. Moreover, the seven planets have equilibrium temperatures low enough to make possible the presence of liquid water on their surfaces6, 7, 8.


Considering the hype NASA tried to build around this discovery, I'm a little let down. I was hoping it'd be unambiguous spectral lines for chlorophyll outside of Earth.

Author:  doctorcos [ Thu Feb 23, 2017 12:41 am ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

As of 12:32 AM 2/23/2017, Google has a funny cartoon on its famous search page. It was obviously inspired by yesterday's announcement by NASA. Go to www.google.com to see it (if it's still there).

Author:  BetaDraconis [ Thu Feb 23, 2017 6:21 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

207 – The TRAPPIST-1 family

http://www.rgbcartoon.com/?comic=207-th ... t-1-family

Quote:
The cartoon above is a rough estimate of what the planets in the TRAPPIST-1 system would look like from the surface of its innermost planet, B. I’ve included the moon as seen from the earth for scale. Keep in mind that the our sun appears essentially the same size as our moon (that’s how you get solar eclipses). Also keep in mind that although the star TRAPPIST-1 would appear to be much larger than our sun we are (a) viewing it from the nearest planet and (b) it gives off most of its light in the infrared spectrum, so it would actually appear quite dim. Huge, but dim.

Author:  BetaDraconis [ Thu Feb 23, 2017 6:43 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Comparing Trappist-1 system with Jupiter's system of Galilean moons

http://www.space.com/35806-trappist-1-facts.html

Author:  BetaDraconis [ Mon Mar 13, 2017 7:49 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Image

This is what TRAPPIST-1 data looks like. This is what is being observed to identify its seven planets.

Author:  BetaDraconis [ Tue Mar 14, 2017 5:41 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Trappist 1: Seven Worlds straight out of Science Fiction

https://thecosmicshed.podbean.com/e/tra ... e-fiction/

Latest episode is about the 7 planets around TRAPPIST-1.

Author:  BetaDraconis [ Mon Mar 20, 2017 6:55 am ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

TRAPPIST-1 and the Seven Dwarfs

https://backalleyastronomy.blogspot.com ... warfs.html

Quote:
TRAPPIST-1 is also the most tightly packed collection of planets discovered to date. The outermost planet of HD 10180 has a cool semimajor axis of 3.4 AU, while the outermost planet of Kepler-90 orbits at about 1 AU (the same as the distance of Earth from the Sun). Among the known six-planet systems, the outermost planets of Kepler-11 and Kepler-20 have semimajor axes of 0.46 AU and 0.35 AU, respectively. By contrast, the semimajor axis of the seventh planet (h) of TRAPPIST-1 is only 0.06 AU, similar to the orbit of a Hot Jupiter. In this regard, the system’s nearest rivals are Kepler-444, with five subterrestrial planets orbiting within 0.08 AU, and Kepler-80, with five terrestrial and gas dwarf planets within a similar radius. Both of the latter systems center on K-type stars, demonstrating that ultra-compact architectures are not unique to ultra-cool M dwarfs.


One of the better and more comprehensive articles on TRAPPIST-1, despite the fact they're quoting The Sun.

Author:  BetaDraconis [ Wed Mar 29, 2017 8:22 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

UV Surface Habitability of the TRAPPIST-1 System

https://arxiv.org/abs/1702.06936

Quote:
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 harbour life arises. Habitable planets around red dwarf stars can orbit in radiation environments that can be life-sterilizing. UV flares from these stars are more frequent and intense than solar flares. Additionally, their temperate HZs are closer to the star. Here we present UV surface environment models for TRAPPIST-1's HZ planets and explore the implications for life. TRAPPIST-1 has high X-ray/EUV activity, placing planetary atmospheres at risk from erosion. 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 present-day Earth. However an eroded or an anoxic 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 surface 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.


tl;dr:

Quote:
The UV surface habitability of planets in the habitable zone (HZ) of the TRAPPIST-1 system depends critically on the activity of the star and the planet's atmospheric composition. The stellar UV environment will also influence the detectable atmospheric features, including any detectable biosignatures. The detection of atmospheric ozone would indicate that a planet is more likely to have habitable UV surface environments. Analysi of the originally announced TRAPPIST-1 planets was found to be possible with the James Webb Space Telescope (JWST) which could detect present-day ozone levels after 60 transits of the original innermost planet and 30 transits of original outermost planets. Hence, future searches for ozone, combined with specral observations of the host star's activity in the 100-40 nm range will enable us to constrain the radiation environments of the HZ planets around TRAPPIST-1, and their surface UV habitability.

Author:  BetaDraconis [ Thu Apr 06, 2017 6:38 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

TRAPPIST-1: Good News and Bad News

http://blogs.discovermagazine.com/d-bri ... -bad-news/

Quote:
Two new papers are out on TRAPPIST-1. One makes the chances for life even more ripe, while the other virtually strips away all chances of habitability.

Author:  BetaDraconis [ Mon Apr 10, 2017 6:16 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

The storm-lashed worlds of Trappist-1

https://www.theguardian.com/science/201 ... -starwatch

Quote:
Now an analysis of data from the Kepler space telescope indicates that Trappist-1 is subject to frequent solar flares, blasting its planets with magnetic storms 100 to 10,000 times stronger than the most intense storms hitting the Earth. The implication is that these would disrupt any atmospheres and make the development of complex life unlikely.

Author:  BetaDraconis [ Tue Apr 25, 2017 5:20 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Further Work on TRAPPIST-1

http://www.centauri-dreams.org/?p=37557

Author:  BetaDraconis [ Wed May 10, 2017 9:38 am ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

The Harmony That Keeps Trappist-1’s 7 Earth-size Worlds From Colliding

https://www.nytimes.com/2017/05/10/scie ... music.html

Don't see it? Hear it.

https://www.youtube.com/watch?v=WS5UxLHbUKc

Author:  BetaDraconis [ Sat May 27, 2017 2:14 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

The far-fetched but fascinating case for aliens from Trappist-1

https://www.cnet.com/news/trappist-1-al ... ife-space/

Quote:
They found that, solely looking at the likelihood of retaining an atmosphere over the long haul, Trappist-1g and 1h may be the most likely planets in the system to be habitable. Furthermore, if the planets have a truly resilient atmosphere that keeps climatic conditions relatively stable over billions of years, it also ups the chances that not just life, but diverse biology and even intelligent life might exist there now or at some point in the future.

Author:  BetaDraconis [ Sat Aug 12, 2017 11:36 am ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

TRAPPIST-1 is Older Than Our Solar System

http://www.astrowatch.net/2017/08/trapp ... solar.html

Quote:
Scientists now have a good estimate for the age of one of the most intriguing planetary systems discovered to date -- TRAPPIST-1, a system of seven Earth-size worlds orbiting an ultra-cool dwarf star about 40 light-years away. Researchers say in a new study that the TRAPPIST-1 star is quite old: between 5.4 and 9.8 billion years. This is up to twice as old as our own solar system, which formed some 4.5 billion years ago.

Author:  BetaDraconis [ Thu Aug 31, 2017 4:48 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Hubble Observations Suggest Water May Be Abundant on Outer TRAPPIST-1 Planets

http://gizmodo.com/hubble-observations- ... 1798675198

Quote:
Observations of TRAPPIST-1 over a three month period suggests that atmospheric escape has played an important role in the evolution of its seven planets—a process that’s still ongoing. Calculations made by Bourrier’s team suggests that the two innermost planets, TRAPPIST-1b and TRAPPIST1-c, have lost gigantic loads of water over the course of their history. These two planets, which receive the highest amount of ultraviolet energy, could have bled 20 Earth-oceans worth of water into space over the past eight billion years.

Author:  BetaDraconis [ Mon Feb 05, 2018 6:50 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Hubble Delivers First Insight into Atmospheres of Potentially Habitable Planets Orbiting TRAPPIST-1

http://www.astrowatch.net/2018/02/hubbl ... -into.html

Author:  BetaDraconis [ Mon Feb 12, 2018 11:15 am ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

A Hitchhiker’s Guide to TRAPPIST-1

https://astrobites.org/2018/02/12/a-hit ... rappist-1/

Quote:
The TRAPPIST-1 HZ planets are much closer to each other than the Earth is to Mars, prompting the authors of this paper to wonder — if life could survive in the TRAPPIST-1 system, what’s the likelihood of life spreading from one planet to the next?

Author:  BetaDraconis [ Fri Jul 20, 2018 6:28 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Alien Solar System Could Harbor Life

http://blogs.discovermagazine.com/d-bri ... have-life/

Author:  BetaDraconis [ Sat Dec 01, 2018 4:54 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Planet-Planet Tides in the TRAPPIST-1 System

https://astrobites.org/2018/12/01/a-cha ... the-tides/

Author:  BetaDraconis [ Wed Apr 17, 2019 6:46 pm ]
Post subject:  Re: NASA to brag about discoveries of more exoplanets in 2 d

Powerful particles and tugging tides may affect extraterrestrial life

https://phys.org/news/2019-04-powerful- ... trial.html

Page 1 of 1 All times are UTC - 5 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/