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 Post subject: general exoplanet thread
PostPosted: Fri Aug 19, 2016 12:08 pm 
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Venus-like Exoplanet Might Have Oxygen Atmosphere, But Not Life

https://www.cfa.harvard.edu/news/2016-18

Quote:
Orbiting so close to its star, at a distance of just 1.4 million miles, (GJ 1132b) is flooded with ultraviolet or UV light. UV light breaks apart water molecules into hydrogen and oxygen, both of which then can be lost into space. However, since hydrogen is lighter it escapes more readily, while oxygen lingers behind.

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PostPosted: Fri Aug 26, 2016 12:21 pm 
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Some “Goldilocks” Planets May Be Too Hot-Blooded for Life

http://www.scientificamerican.com/artic ... -for-life/

Quote:
A new study suggests that, contrary to prevailing wisdom, the temperature of a planet doesn't always stabilize over time, so hot-blooded worlds may have a hard time holding onto liquid water — even if they reside in the temperate region around their stars known as the "habitable zone."

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PostPosted: Thu Sep 01, 2016 7:56 am 
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Astronomers just discovered two of the closest-orbiting twin stars ever

http://www.sciencealert.com/astronomers ... stars-ever

Quote:
And this isn't just any old binary star system – these stars, called HD 133131A and HD 133131B, are the the closest-orbiting twin stars that scientists have ever found in a binary system where both the stars host planets.


Image

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PostPosted: Wed Sep 21, 2016 9:54 am 
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First-Ever Binary Alien Planets Possibly Found

http://www.space.com/34121-first-ever-b ... anets.html

Quote:
The pair lie within a dense cluster of stars that would normally be expected to strip objects away from one another. However, observations suggest that the two objects are so close that interactions with other stars would instead push them closer together, Gagliuffi said.


Frustratingly this appears to be the ONLY article regarding this discovery and it doesn't mention which star, just that it's 65 light years away.

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PostPosted: Fri Sep 23, 2016 2:23 pm 
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Circumbinary Planet Found in Microlensing Data

http://www.centauri-dreams.org/?p=36456

Quote:
"The ground-based observations suggested two possible scenarios for the three-body system: a Saturn-mass planet orbiting a close binary star pair or a Saturn-mass and an Earth-mass planet orbiting a single star… [T]he model with two stars and one planet is the only one consistent with the Hubble data. We were helped in the analysis by the almost perfect alignment of the foreground binary stars with the background star, which greatly magnified the light and allowed us to see the signal of the two stars."



Source from arXiv: The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c

https://arxiv.org/abs/1609.06720

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PostPosted: Mon Oct 03, 2016 3:08 pm 
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Hubble Finds Planet Orbiting Pair of Stars

http://www.nasa.gov/feature/goddard/201 ... r-of-stars

Quote:
The planet orbits roughly 300 million miles from the stellar duo, about the distance from the asteroid belt to our sun. It completes an orbit around both stars roughly every seven years. The two red dwarf stars are a mere 7 million miles apart, or 14 times the diameter of the moon's orbit around Earth.


If you wanna do the math and see how it works, visit Artifexian on YouTube. He has a great series of instructional videos.

This video on p-type systems is relevant to Hubble's discovery.

https://www.youtube.com/watch?v=1nV2ygdKZ3s

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PostPosted: Mon Oct 10, 2016 2:30 pm 
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ESO Captures First-Ever Clear Image of An Exoplanet Candidate, And It’s 11 Quadrillion km Away

http://futurism.com/eso-captures-first- ... n-km-away/

1200 light years from Earth. JUST LOOK AT THAT PIXEL!

Also the planet needs to be confirmed, so don't get excited. My question is, why does a planet need to be confirmed? Are there exoplanets who'd rather have a bar mitzvah?

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PostPosted: Tue Oct 11, 2016 2:13 pm 
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The newest weird solar systems: lonely hot Earths

http://astronomy.com/news/2016/10/the-n ... hot-earths

Quote:
Out of the 144 hot Earths the team identified, they estimated that at least 24 of them orbit without another close planet, making them unique compared to multi-planet systems. Their finding suggests that at least 1 out of every 6 hot Earths have no nearby companion. In this case, 'nearby' means worlds with orbits "only a few times larger than the orbit of the hot Earth," Steffen said, which would translate to one or two months.

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PostPosted: Thu Oct 13, 2016 9:45 pm 
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Distant Ringed Object Could Be ‘Saturn on Steroids’

http://www.nytimes.com/2016/10/14/scien ... 1407b.html

Meet J1407b and its gigantic rings that orbit the "wrong way", as the New York Times's Nicholas St. Fleur puts it.

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PostPosted: Tue Oct 25, 2016 4:34 pm 
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Some Alien Worlds Could Have 'Too Much' Water for Life

http://www.seeker.com/some-alien-worlds ... 85845.html

Quote:
But a huge supply of water on small exoplanets orbiting red dwarfs may not necessarily be a good thing. "While liquid water is generally thought to be an essential ingredient, too much of a good thing may be bad," said study co-author Willy Benz.

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PostPosted: Mon Oct 31, 2016 7:40 pm 
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Vital Signs: Seismology of ocean worlds

https://arxiv.org/abs/1610.10067

Quote:
Ice covered ocean worlds are probably seismically active. Measuring that activity can provide information about global and local habitability. This article examines the likely seismic activity of known and potential ocean worlds. We describe objectives and possible implementations for icy moon seismology. For currently known ocean worlds, we consider science objectives and technical challenges, and suggest priorities based on feasibility and potential science return. A seismic experiment could be less complex and less susceptible to noise than those implemented on Earth's Moon and planned for Mars. Such an investigation could probe the transport properties and radial structure of ocean worlds, yielding critical constraints on potential redox fluxes, and thus habitability.

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PostPosted: Wed Nov 02, 2016 9:27 am 
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This Blue Alien Planet Is Not at All Earth-Like

https://www.scientificamerican.com/arti ... arth-like/

Quote:
The winds on HD 189733b (which lies about 63 light-years from Earth, in the constellation Vulpecula) blow at up to 5,400 mph (8,700 km/h) — about seven times the speed of sound. And if that's not crazy enough for you, scientists think the rain on this world is made not of water, but of molten glass.


Yikes.

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PostPosted: Thu Nov 03, 2016 4:59 pm 
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Unusual Planets in a Close Binary System

http://www.centauri-dreams.org/?p=36573

Quote:
The three Alpha Centauri stars get more and more interesting as we begin to discover planets around them, and the hope of finding planets in the habitable zone around Centauri A or B continues to drive research. Alpha Centauri could be thought of as a close binary with a distant companion, since we’re still not absolutely sure whether Proxima Centauri is gravitationally bound to the system. Learning more about binary systems, in any case, is interesting in itself but also may open windows into our nearest stellar neighbors.

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PostPosted: Sat Nov 12, 2016 11:11 am 
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Earth-bound instrument analyzes light from planets circling distant stars

https://www.princeton.edu/main/news/arc ... /index.xml

Image

CHARIS will be available for use in February 2017.

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PostPosted: Sat Dec 10, 2016 12:12 am 
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The Woman Who Might Find Us Another Earth

http://www.nytimes.com/2016/12/07/magaz ... earth.html

Profile of Sara Seager

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PostPosted: Sat Dec 31, 2016 3:09 pm 
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Astronomers Discover Two Gas Giant Alien Worlds

http://www.astrowatch.net/2016/12/astro ... giant.html

Quote:
K2-60b is a sub-Jovian exoworld with a radius of about 0.68 Jupiter radii and 58 percent less massive than our solar system’s biggest planet. EPIC 216468514b has a radius 44 percent larger than Jupiter’s and a mass of 0.84 Jupiter masses. What is noteworthy, both planets have short orbital periods - 3 and 3.31 days respectively.

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PostPosted: Mon Jan 09, 2017 10:38 am 
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Hubble Captures ‘Shadow Play’ Caused by Possible Planet

https://www.nasa.gov/feature/goddard/20 ... ble-planet

Quote:
The planet itself is not casting the shadow. But it is doing some heavy lifting by gravitationally pulling on material near the star and warping the inner part of the disk. The twisted, misaligned inner disk is casting its shadow across the surface of the outer disk.

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PostPosted: Mon Jan 09, 2017 4:53 pm 
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Garnet World: Stellar Composition & Planetary Outcomes

http://www.centauri-dreams.org/?p=36920

Quote:
What effect does the composition of a star have on the planets that form around it?

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PostPosted: Sun Jan 15, 2017 8:48 pm 
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Final Results of NameExoWorlds Public Vote Released

http://military-technologies.net/2017/0 ... -released/

With one exception...

Quote:
However, after extensive deliberation, the Committee decided to annul the vote for one particular ExoWorld — tau Boötis — as the winning name was judged not to conform with the IAU rules for naming exoplanets. To this end, the IAU will organise a new contest to decide the name of tau Boötis in the future.

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PostPosted: Sun Jan 15, 2017 8:50 pm 
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Aw nuts, I thought it was going to be something fun like "Planet McPlanetpants" or something.

Tau Boötis

http://nameexoworlds.iau.org/systems/107

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PostPosted: Tue Jan 24, 2017 4:55 pm 
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A Four Planet System in Orbit, Directly Imaged and Remarkable

http://www.manyworlds.space/index.php/2 ... emarkable/

Quote:
The images were initially captured by Dr. Christian Marois of the National Research Council of Canada’s Herzberg Institute of Astrophysics. The movie animation was put together by Wang, who is part of the Berkeley arm of the Nexus for Exoplanet System Science (NExSS), a NASA-sponsored group formed to encourage interdisciplinary exoplanet science.

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PostPosted: Mon Jan 30, 2017 7:53 pm 
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Keck Observatory's New Planet Imager Delivers First Science

http://www.astrowatch.net/2017/01/keck- ... mager.html

Quote:
The new vortex results are presented in two papers, both published in the January 2017 issue of The Astronomical Journal. One study, led by Gene Serabyn of JPL, the overall lead of the Keck vortex project, presents the first direct image of the brown dwarf called HIP 79124 B. This brown dwarf is located 23 astronomical units from a star in a nearby star-forming region called Scorpius-Centaurus (an astronomical unit is the distance between our sun and Earth).

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PostPosted: Tue Jan 31, 2017 10:09 am 
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The Truth About Exoplanets

http://www.nature.com/news/the-truth-about-exoplanets-1

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PostPosted: Sun Feb 12, 2017 1:01 pm 
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NASA Team Looks to Ancient Earth First to Study Hazy Exoplanets

http://www.astrowatch.net/2017/02/nasa- ... first.html

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PostPosted: Wed Feb 15, 2017 8:41 am 
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Scientists find a hot 'super-Earth' and 60 more planets, boosting chances of discovering life

http://www.independent.co.uk/news/scien ... 78401.html

Quote:
One of the exoplanets was a hot "super-Earth" that has a rocky surface and is found in the fourth nearest star system to our own. That planet, known as Gliese 411-b, could suggest that all the stars near our own sun have planets orbiting them – and as such that those too might be like Earth and have the conditions for supporting alien life.

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