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Profile Pierre A Renaud
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Message 2001135 - Posted: 5 Jul 2019, 4:16:01 UTC

Astronomers Are Baffled by HD 139139, the Most Bizarre Star Yet
Unusual dips of light observed by the Kepler space telescope have so far confounded attempts at an explanation
By Adam Mann on July 3, 2019
https://www.scientificamerican.com/article/astronomers-dont-know-what-to-make-of-this-incredibly-bizarre-star/

"When people in our community hear about something like this, the running joke is it might be aliens," Vanderburg says. The possibility crossed his mind, he adds, as the seemingly-random dips reminded him of the scene in the film Contact in which Jodie Foster's character begins hearing blips from outer space that trace out a prime number sequence.

The newly noticed star will certainly be added to the list of those investigated for signs of technological activity, Wright says. But he considers it more likely astronomers will eventually settle on an explanation that does not involve intelligent extraterrestrials. Boyajian agrees. "I think we have to consider all options before we go there," she says. "This is one of those systems where it's probably not going to be figured out without more data."

Yet few other observatories can match Kepler's extreme precision. Most ground-based telescopes are not sensitive enough to see the involved light dips, and it is difficult for researchers to reserve the relatively long stretches of time they would require on a powerful orbiting instrument such as the Hubble Space Telescope. NASA's recently launched Transiting Exoplanet Survey Satellite (TESS) is not scheduled to look at HD 139139 during its primary campaign, though perhaps if the satellite receives an extended mission it could.

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Message 2001193 - Posted: 5 Jul 2019, 18:44:11 UTC
Last modified: 5 Jul 2019, 18:57:17 UTC

I see what appear to be trends of development in the graph of dips of the star HD139139, which is reproduced in the article linked below. Early on, the largest dips immediately before the largest one of all show a greater and greater dip in light output. These first increase slowly, them more rapidly at the end, which is marked by the deepest dip. From this point on, the largest dips show a trend of gradually lessening in depth. Both the trends of deepening and lessening depths occur over approximately the same length of time.

https://gizmodo.com/freaky-star-seems-to-dim-randomly-and-astronomers-dont-1836045295
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Profile Pierre A Renaud
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Message 2004252 - Posted: 25 Jul 2019, 20:23:57 UTC

Breakthrough Listen's new search for alien lasers | Space 2019.07.24
https://earthsky.org/space/breakthrough-listen-seti-optical-beacons-technosignatures

For the last few decades, the search for extraterrestrial intelligence has focused on detecting radio signals. But a new collaboration between Breakthrough Listen and VERITAS will focus on looking for laser-like flashes of light.
https://breakthroughinitiatives.org/initiative/1
https://veritas.sao.arizona.edu/
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