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 Post subject: Re: KIC 8472852 thread
PostPosted: Sat Aug 13, 2016 12:13 pm 
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Have we detected an alien megastructure in space? Keep an open mind

https://www.theguardian.com/commentisfr ... -telescope

Seth Shostak writes:

Quote:
But there remains the chance that this is, indeed, something other than a work of unthinking Nature. And while the odds against Tabby’s star being a deliberate construction are long, so are the odds that the cosmic ocean is entirely sterile. So we’ll continue to cast our line into its murky depths.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Sun Aug 14, 2016 4:32 pm 
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Get involved with monitoring KIC 8462852's activity with the American Association of Variable Star Observers.

https://www.aavso.org/aavso-alert-notice-542

Quote:
April 8, 2016: Further to AAVSO Alert Notice 532, the AAVSO is requesting ongoing time-series observations of the enigmatic variable object KIC 08462852 (= KIC 8462852) beginning immediately and continuing through at least the end of 2016.


Quote:
Coordinates: R.A. 20 06 15.46 Dec. +44 27 24.8 (J2000)

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 Post subject: Re: KIC 8472852 thread
PostPosted: Tue Aug 16, 2016 8:48 pm 
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Searching for "Tabby's Star" Analogs in Stripe 82

http://beta.briefideas.org/ideas/534f23 ... 1a63c4a3ee

Quote:
Stripe82 was a 10-year multi-epoch photometric catalog by SDSS, covering ~300 sq deg with 70-90 epochs in ugriz. More than 10,000 objects were identified as variable with F star colors from Stripe82, with many likely pulsators or eclipsing binaries. The photometric precision of Stripe82 is sufficient to detect the long-term, non-stationary variability observed from "Tabby's Star". Additionally, the 8% duty cycle of short-term dimming events should stand out as several aperiodic outliers in the Stripe82 light curves. Finally, the near-simultaneous multi-band data from SDSS may provide important clues as to nature of this new class of variable star.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Tue Aug 16, 2016 8:59 pm 
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For those of you playing along at home:

Quote:
Stripe 82 is a 300 deg2 equatorial field of sky that was imaged multiple times by the Sloan Digital Sky Survey from 2000 to 2008.


Quote:
SDSS has imaged about one-third of the night sky in five broad bands (ugriz).


I'm presuming ugriz stands for ultraviolet, gamma, radio, infrared, but the 'z' is eluding me and my attempts to decipher the acronym.

More reading:

http://adsabs.harvard.edu/abs/2007AJ....134..973I

https://www.sdss3.org/dr9/imaging/imaging_basics.php

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 Post subject: Re: KIC 8472852 thread
PostPosted: Tue Aug 16, 2016 9:54 pm 
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Since the SDSS uses an optical telescope, it's unlikely to be receptive to radio wavelengths, or even gamma rays, but no visible wavelengths, so I followed your SDSS3 link a couple of clicks and found...

u = ultraviolet
g = green
r = red
i = infrared
z = farther infrared

See the list of filters with central wavelengths:
http://www.sdss3.org/instruments/camera.php#Filters

And here's a data example with filter colors described:
http://skyserver.sdss.org/dr9/en/tools/quicklook/quickobj.asp

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Aug 17, 2016 12:55 am 
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JoeStieber wrote:
Since the SDSS uses an optical telescope, it's unlikely to be receptive to radio wavelengths, or even gamma rays, but no visible wavelengths, so I followed your SDSS3 link a couple of clicks and found...

I probably could have written it better as...

Since the SDSS uses an optical telescope, it's unlikely to be receptive to radio wavelengths, or even gamma rays -- but no visible wavelengths? So, I followed your SDSS3 link a couple of clicks and found...

etc.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Aug 17, 2016 7:05 am 
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Thanks, Joe!

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Aug 17, 2016 6:58 pm 
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Frontiers in Artifact SETI: Waste Heat, Alien Megastructures & Tabbys Star - Jason Wright (ST 2016)

64 minutes long

https://www.youtube.com/watch?v=XEDR-G2EDRM

Quote:
The launch of the Kepler and WISE satellites have greatly renewed interest in the field, however, and the recent Breakthrough Listen Initiative has provided new motivation for finding good targets for communication SETI. Dr. Wright will discuss the progress of the Ĝ Search for Extraterrestrial Civilizations with Large Energy Supplies, including its justification and motivation, waste heat search strategy and first results, and the framework for a search for megastructures via transit light curves. The last of these led to the identification of KIC 8462852 (a.k.a. "Tabby's Star") as a candidate ETI host. This star, discovered by Boyajian and the Zooniverse Planet Hunters, exhibits several apparently unique and so-far unexplained photometric properties, and continues to confound natural explanation.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Aug 24, 2016 8:42 pm 
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New Star Data Still Can't Explain Those Alien Megastructures

https://www.inverse.com/article/20075-a ... -star-data

Quote:
Only backers of the original Kickstarter campaign have access to the dataset, but even if that doesn’t include you, you’re not missing much. KIC 8462852 is not currently dimming or brightening — and even if it was, there’s not enough data yet to compare observations across a broad timescale.


Kind of a big nothing but still any info is still good info, cxu ne?

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 Post subject: Re: KIC 8472852 thread
PostPosted: Sat Aug 27, 2016 8:24 am 
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Looks like KIC 8462852 isn't the only game in town.

An Interesting SETI Candidate in Hercules

http://www.centauri-dreams.org/?p=36248

Quote:
No one is claiming that this is the work of an extraterrestrial civilization, but it is certainly worth further study. Working out the strength of the signal, the researchers say that if it came from an isotropic beacon, it would be of a power possible only for a Kardashev Type II civilization. If it were a narrow beam signal focused on our Solar System, it would be of a power available to a Kardashev Type I civilization. The possibility of noise of one form or another cannot be ruled out, and researchers in Paris led by Jean Schneider are considering the possible microlensing of a background source by HD164595. But the signal is provocative enough that the RATAN-600 researchers are calling for permanent monitoring of this target.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Aug 31, 2016 1:55 pm 
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Alien signal detected by Russian astrophysicists turns out to be terrestrial disturbance

http://tass.com/science/896683 http://tass.com/science/896683

:( :( :(

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Sep 14, 2016 8:12 am 
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If anyone's interested Jason Wright, the guy who raised the specter of aliens at UPenn, has a 10 part series on the curiosities surrounding KIC 8462852

http://sites.psu.edu/astrowright/tabbys-star-posts/

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Sep 26, 2016 10:02 am 
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If anyone is curious, one can find KIC 8462852 a.k.a. Boyajian's Star in Deneb.

It's between the stars Sadr (Gamma Cygni) and Rukh (Delta Cygni). Find NGC 6886, then look a little up and to the left for Boyajian's Star.

It's 11-12 magnitude.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Sep 26, 2016 10:24 am 
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I covered the position and finding of this object with some thoroughness in my post of July 5, 2016, on page 1 of this thread (it's in Cygnus, not Deneb).

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Oct 03, 2016 5:09 pm 
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Our galaxy's most-mysterious star is even stranger than astronomers thought

https://www.sciencedaily.com/releases/2 ... 140315.htm

Quote:
"The steady brightness change in KIC 8462852 is pretty astounding," said Montet. "Our highly accurate measurements over four years demonstrate that the star really is getting fainter with time. It is unprecedented for this type of star to slowly fade for years, and we don't see anything else like it in the Kepler data."

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 Post subject: Re: KIC 8472852 thread
PostPosted: Tue Dec 20, 2016 2:32 pm 
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Viewpoint: New Clues as to Why Boyajian’s Star is Dimming

http://physics.aps.org/articles/v9/150

Quote:
Here, Sheikh et al. consider the sequence of dimming events as a series of local signals, independent of their astrophysical nature. The authors calculate a number of statistical parameters of the dimming, such as the deviation in brightness from the median, the spectrum of fluctuations, and the slope of the log-log distribution of the duration and size of the dimming events. These parameters can be accurately fit with power laws. The analysis suggests that the flux dips are reminiscent of avalanches—sudden changes of a system under an external force. Avalanche statistics are observed in nonequilibrium systems undergoing internal dynamics near the critical point of a phase transition. This occurs, for example, in a ferromagnet close to its ordering temperature and in a magnetic field: when a spin flips to align with the field, it can trigger an avalanche of spin flips that causes a jump in the macroscopic magnetization. Avalanche statistics have been found in astrophysical phenomena, from stellar flares to gamma-ray bursts, and in many critical phenomena in biology and physics. Avalanche models predict a universal behavior for statistical parameters that relate the amplitude, duration, and probability of avalanches, such as the power spectral density function and the time profile of the avalanches. This is exactly what the authors find in the distribution of dimming dips.


In English, the flux dips are caused by internal processes but the long-term dimming remains a mystery.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Jan 09, 2017 4:54 pm 
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‘Alien megastructure’ signal may be due to star eating a planet

https://www.newscientist.com/article/21 ... -a-planet/

Quote:
Now Brian Metzger at Columbia University in New York and his colleagues have a theory that could explain both the brief dips in light and the gradual dimming. The group thinks Tabby’s star is just returning to its natural state – after a large, messy meal.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Fri Jan 20, 2017 8:04 am 
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I didn't see this posted . . .

FAMILIES OF PLAUSIBLE SOLUTIONS TO THE PUZZLE OF BOYAJIAN'S STAR (KIC 8472852)
http://iopscience.iop.org/article/10.3847/2041-8205/829/1/L3/meta

From abstract: "We find the ISM and intervening disk models more plausible than the other natural models."

Rich B.


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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed May 31, 2017 2:40 pm 
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Astronomers say rings and asteroids could explain strange signals around Boyajian's Star

http://www.dailymail.co.uk/sciencetech/ ... cture.html

:eyeroll:

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 Post subject: Re: KIC 8472852 thread
PostPosted: Thu Jun 15, 2017 7:32 am 
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Alien megastructures – where we should look next

https://www.theguardian.com/science/acr ... -look-next

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 Post subject: Re: KIC 8472852 thread
PostPosted: Sat Jul 01, 2017 1:09 pm 
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The Strangest (and Second-Strangest) Star in the Galaxy

http://blogs.discovermagazine.com/outth ... 30/wright/

A piece about Przybylski's Star and Boyajian's Star

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Jul 10, 2017 8:01 am 
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Another Possibility for Boyajian’s Star

http://aasnova.org/2017/07/07/another-p ... ians-star/

tl;dr: star spots, powerful big'uns

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 Post subject: Re: KIC 8472852 thread
PostPosted: Wed Jan 03, 2018 10:09 am 
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No alien megastructure around mysterious 'Tabby's star', analysis shows

https://www.theguardian.com/science/acr ... ysis-shows

Quote:
Stand down space cadets, there is (sadly) no alien megastructure around star KIC 8462852, also known as Tabby’s star


Yet astronomers still don't know if it's entirely dust or something going on with the star.

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 Post subject: Re: KIC 8472852 thread
PostPosted: Mon Jan 15, 2018 12:04 pm 
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Where’s the flux? Dust? Discuss.

https://astrobites.org/2018/01/15/where ... t-discuss/

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 Post subject: Re: KIC 8472852 thread
PostPosted: Fri Jan 19, 2018 4:09 pm 
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A Reassessment of Families of Solutions to the Puzzle of Boyajian's Star

http://iopscience.iop.org/article/10.38 ... aa83e/meta

It's a short paper.

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