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PostPosted: Thu Feb 16, 2017 3:14 pm 
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Pulsing Stars Reveal Orbiting Planets --"The Link Is a Mystery That Can't Be Explained"

http://www.dailygalaxy.com/my_weblog/20 ... ained.html

Quote:
For the first time, astronomers from MIT and elsewhere have observed a star pulsing in response to its orbiting planet. The star, which goes by the name HAT-P-2, is about 400 light years from Earth and is circled by a gas giant measuring eight times the mass of Jupiter—one of the most massive exoplanets known today. The planet, named HAT-P-2b, tracks its star in a highly eccentric orbit, flying extremely close to and around the star, then hurtling far out before eventually circling back around.

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PostPosted: Tue Mar 28, 2017 5:57 pm 
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Habitable Planet Reality Check: Wolf 1061c Revisited

http://www.drewexmachina.com/2017/03/25 ... revisited/

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In a recent paper submitted for publication in the peer-reviewed Astronomy & Astrophysics with Nicola Astudillo-Defru (Observatoire de Genève) as the lead author, the latest analysis results of HARP data for five nearby M-dwarf stars are described in detail. Among the new finds is a potentially habitable exoplanet found orbiting the nearby red dwarf GJ 273 or Luyten’s Star located only 12.4 light years away (see “Habitable Planet Reality Check: The Nearby GJ 273 or Luyten’s Star”). Another system described by Astudillo-Defru et al. is GJ 628 better known as Wolf 1061. Back in December of 2015, a team of astronomers led by Duncan Wright (University of New South Wales – Australia) announced the discovery of three exoplanets orbiting this nearby red dwarf they found using publicly available HARPS spectra including one, Wolf 1061c, that has some prospects of being potentially habitable (see “Habitable Planet Reality Check: Wolf 1061”). Because of the new results of Astudillo-Defru et al. along with updated information on the properties of Wolf 1061, it is time to take a fresh look at the potential habitability of Wolf 1061c.


Relevant Wiki page:
https://en.wikipedia.org/wiki/Wolf_1061c

Quote:
Wolf 1061c or WL 1061c is an exoplanet orbiting within the habitable zone of the red dwarf star Wolf 1061 in the constellation Ophiuchus, about 13.8 light years from Earth, making it the second-closest known potentially habitable exoplanet to Earth, after Proxima Centauri b. It is the second planet in order from its host star in a triple planetary system, and has an orbital period of 17.9 days. Wolf 1061c is classified as a super-Earth exoplanet as its estimated radius is greater than 1.5 earth radiuses.


Unnecessary pedantry, we won't know if these worlds are truly habitable for life from Earth 'til we can visit them.

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PostPosted: Thu Apr 06, 2017 6:42 pm 
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Atmosphere around super-Earth detected

https://phys.org/news/2017-04-atmospher ... earth.html

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Crucially, the new observations showed the planet to be larger at one of the infrared wavelengths than at the others. This suggests the presence of an atmosphere that is opaque to this specific infrared light (making the planet appear larger) but transparent at all the others. Different possible versions of the atmosphere were then simulated by team members at the University of Cambridge and the Max Planck Institute for Astronomy. According to those models, an atmosphere rich in water and methane would explain the observations very well.

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PostPosted: Sun Apr 16, 2017 8:36 pm 
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Astronomers Have Been Finding 1 New Exoplanet A Day On Average Since Kepler Launched in 2009

https://statisticalfuture.org/astronome ... d-in-2009/

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PostPosted: Tue May 02, 2017 7:00 am 
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Dwarf planetary systems will transform the hunt for alien life

https://aeon.co/ideas/dwarf-planetary-s ... alien-life

Quote:
Instead, we seek an answer to ‘How frequently is life found elsewhere?’ This simple change of words means that we should also be investigating planetary systems unlike the solar system. It would be disappointing and surprising if Earth were the only template for habitability in the Universe. Sun-like stars represent just 15 per cent of all stars in the Milky Way. More than half of those, in turn, exist in binary star systems that have also been disregarded as being too different from the conditions present in the solar system. The search for Earth twins therefore covers a nearly insignificant fraction of all the outcomes in nature.

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PostPosted: Wed May 03, 2017 6:36 am 
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NASA discovers entire solar system that is 'remarkably similar' to ours

https://www.independent.co.uk/news/scie ... 14701.html

Quote:
Found just 10 light-years away in the constellation Eradinus, the scientists say that the solar system around the star Epsilon Eridani looks remarkably similar to the one around our own sun. And it's the closest that includes a star that's like a youthful version of our own.

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PostPosted: Sat May 20, 2017 10:20 am 
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Exocomets Light Up 100 Billion Kilometers of Space

https://blogs.scientificamerican.com/li ... -of-space/

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The bottom line is that this 100-billion kilometer circumference ring (with a width of approximately 2 billion kilometers) is likely revealing the presence of a vast population of icy exocomets. As these objects collide with each other - either in a few massive collisions, or a stream of cascading pile-ups - some of their frozen gases are released to interplanetary space.


Curious, IMO, in light of the cometary hypothesis hoping to explain the phenomenon of Boyajian's Star.

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PostPosted: Mon Jun 05, 2017 3:32 pm 
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Feeling Hot, Hot, Hot: Astronomers Discover a Giant Planet Hotter Than Most Stars

https://www.scientificamerican.com/arti ... ost-stars/

Quote:
Gaudi and his team calculated KELT-9b to be roughly 3,777 degrees Celsius (6,830 degrees Fahrenheit) on the dark side and 4327 degrees C (7,820 degrees F) on the star-exposed side. This makes KELT-9b almost 20 percent hotter than the next-most-scorching exoplanet, WASP-33b.

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PostPosted: Mon Jun 12, 2017 9:10 pm 
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Two new massive planets detected around the star HD 27894

https://phys.org/news/2017-06-massive-p ... ar-hd.html

Quote:
According to the research, HD 27894 c has a mass of about 0.16 Jupiter masses, an orbital period of 36 days and is circling its host at a distance of 0.2 AU. HD 27894 d is much more massive, with a mass of approximately 5.4 Jupiter masses. The Jovian planet is also orbiting the star at a much larger distance than the other two worlds in the system. It takes HD 27894 d over 14 years to complete one full orbit, as it is located almost 5.5 AU from the host.

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PostPosted: Thu Jun 15, 2017 7:14 am 
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Researchers Advocate Statistical Approach to Search for Earth-Like Planets

http://www.astrowatch.net/2017/06/resea ... tical.html

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PostPosted: Mon Jun 19, 2017 12:17 pm 
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Is Earth All by Its Lonesome? Kepler Finds 4,034 Possible Companions

https://www.nytimes.com/2017/06/19/scie ... ensus.html

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Setting the stage for the next chapter in the quest to end cosmic loneliness, astronomers released a list on Monday of 4,034 objects they are 90 percent sure are planets orbiting other stars.

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PostPosted: Tue Jun 20, 2017 3:54 pm 
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Giant Planets Can Act as Stabilizing Agents on Debris Disks

http://iopscience.iop.org/article/10.38 ... ld.iop.org

Quote:
We have explored the evolution of a cold debris disk under the gravitational influence of dwarf-planet-sized objects (DPs), both in the presence and absence of an interior giant planet. Through detailed long-term numerical simulations, we demonstrate that when the giant planet is not present, DPs can stir the eccentricities and inclinations of disk particles, in linear proportion to the total mass of the DPs; on the other hand, when the giant planet is included in the simulations, the stirring is approximately proportional to the mass squared. This creates two regimes: below a disk mass threshold (defined by the total mass of DPs), the giant planet acts as a stabilizing agent of the orbits of cometary nuclei, diminishing the effect of the scatterers; above the threshold, the giant contributes to the dispersion of the particles.

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PostPosted: Wed Jun 21, 2017 7:56 am 
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The Family Tree of Exoplanets Has Just Divided Into Two Branches

https://www.seeker.com/space/planets/th ... o-branches

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An analysis of nearly 3,500 known exoplanets shows that planets in our galaxy overwhelmingly fall into two groups.

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PostPosted: Wed Jul 12, 2017 7:54 am 
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A Binary ‘Rogue’ Planet?

https://www.centauri-dreams.org/?p=38085

And here's the original paper:

http://iopscience.iop.org/article/10.38 ... 0-40-1-105

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PostPosted: Wed Jul 12, 2017 3:40 pm 
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Hidden Stars May Make Planets Appear Smaller

http://www.astrowatch.net/2017/07/hidde ... ppear.html

Quote:
When a telescope spots a planet crossing in front of its star -- an event called a "transit" -- astronomers measure the resulting apparent decrease in the star's brightness. The amount of light blocked during a transit depends on the size of the planet -- the bigger the planet, the more light it blocks, and the greater the dimming that is observed. Scientists use this information to determine the radius -- half the diameter -- of the planet.

If there are two stars in the system, the telescope measures the combined light of both stars. But a planet orbiting one of these stars will cause just one of them to dim. So, if you don't know that there is a second star, you will underestimate the size of the planet.

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PostPosted: Sat Jul 15, 2017 5:20 pm 
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Dark Matter Might Clump to Form Planets

http://blogs.discovermagazine.com/d-bri ... m-planets/

Quote:
“The most massive of these objects would end up collapsing to black holes because there would likely not be any internal forces strong enough to arrest that collapse, as there is for the baryons,” Buckley says. “The black holes would be like any other black hole: gravity doesn’t distinguish between dark matter and baryons, so a black hole is the same regardless of the material that goes into it.”

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PostPosted: Mon Jul 24, 2017 10:15 am 
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Wandering in the Void, Billions of Rogue Planets Without a Home

https://www.scientificamerican.com/arti ... ut-a-home/

Quote:
New results suggest free-floating giant planets are less common than previously believed, but hint at vast numbers of smaller castaway worlds.

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PostPosted: Thu Jul 27, 2017 9:08 am 
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Are Astronomers on the Verge of Finding an Exomoon?

https://blogs.scientificamerican.com/ob ... n-exomoon/

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It would be a huge discovery, but until they train the Hubble on a possible candidate, they won't know for sure—so stay tuned

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PostPosted: Tue Aug 01, 2017 10:07 am 
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Rogue 'Double Planet' Proves to Be Two Failed Stars

https://www.scientificamerican.com/arti ... led-stars/

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The two co-orbiting brown dwarfs drift between the stars 95 light-years from Earth, and form the lightest binary system ever found

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PostPosted: Tue Aug 08, 2017 4:24 pm 
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An artificial eclipse for imaging extrasolar planets

https://phys.org/news/2017-08-artificia ... anets.html

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Proposed observatories capable of imaging Earth-like planets require a starshade tens of meters in diameter separated from the telescope by a distance equal to multiple Earth diameters, and the formation would have to be deployed beyond Earth orbit. Altogether, this mission would cost billions of dollars. Instead of sending a pricey, untested system into space, D'Amico's lab, in collaboration with exoplanet expert Bruce Macintosh, professor of physics, has created a smaller version of this formation, likely to cost millions rather than billions. The primary objective of this mission is to provide a low-cost flight demonstration of starshade technology to increase the confidence of the scientific community in the capabilities of a full-scale observatory.

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PostPosted: Thu Aug 10, 2017 10:16 am 
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Four Earth-sized planets detected orbiting the nearest sun-like star

https://news.ucsc.edu/2017/08/tau-ceti-planets.html

Tau Ceti or bust!

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PostPosted: Mon Aug 14, 2017 7:59 am 
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The Air Out There: Astronomers Aim to Find Atmospheres of Alien Earths

https://www.scientificamerican.com/arti ... en-earths/

Quote:
Remotely sniffing the air of these tantalizing worlds is no easy task, and is unlikely to occur sooner than the end of this decade, if not well into the next. The first observations could be made by NASA’s infrared James Webb Space Telescope, launching in 2018, followed in the mid-2020s by a new generation of ground-based “Extremely Large Telescopes” with 30-meter mirrors.

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PostPosted: Tue Sep 26, 2017 5:31 pm 
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A Statistical Look at Exoplanet Atmospheres

https://www.centauri-dreams.org/?p=38547

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What jumps out of this work is the fact that the detectability of ‘hot Jupiter’ atmospheres through the ADI metric appears to be dependent on planetary radius rather than planetary mass.

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PostPosted: Wed Oct 11, 2017 2:10 pm 
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Giant Exoplanet Hunters: Look for Debris Disks

https://www.jpl.nasa.gov/news/news.php?feature=6970

Quote:
Astronomers found the likelihood of finding long-period giant planets is nine times greater for stars with debris disks than stars without disks. Caltech graduate student Marta Bryan performed the statistical analysis that determined this result.

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PostPosted: Fri Oct 13, 2017 4:57 pm 
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A Star That Devoured Its Own Planets

http://www.astrowatch.net/2017/10/a-sta ... anets.html

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