Did planet hunter discovered a swarm of comets... Or an alien megastructure?

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Re: Did planet hunter discovered a swarm of comets... Or an alien megastructure?

Post by Sirius_Alpha on 21st May 2017, 8:58 pm

Or it could be that their data is not sensitive enough to detect any changes.

Boyajian reports spectral changes:
Tabetha Boyajian wrote:More dippy in B, lesser so in i'
https://twitter.com/tsboyajian/status/866390381063229441

Which would imply dust. Also,

HeyItsNatalie wrote:Well that screams dust to me. People have been talking about achromacity in the spectrum, but remember we're looking for percent level differences. Those are hard to find in spectroscopy since we're diving up the light into so many little bins with only a few photons, the uncertainty will be larger in each. Subtle color changes are easier to find in photometry.
https://www.reddit.com/r/KIC8462852/comments/6ciy1j/more_dippy_in_b_lesser_so_in_i_maybe_we_need_a/

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Re: Did planet hunter discovered a swarm of comets... Or an alien megastructure?

Post by Sirius_Alpha on 23rd May 2017, 8:29 pm

Here's another hypothesis that goes like this:

KIC 8462852: Will the Trojans return in 2021?
https://arxiv.org/abs/1705.08427

The transit at ~700 days in the Kepler data was caused by a ringed massive planet. The transit at ~1500 days is from a cloud of trojan asteroids in the same orbit as the object responsible for the event at ~700 days. In this scenario, the dip in brightness that happened last weekend is a secondary eclipse, where the planet+rings passed behind the star. If this is the case, the planet is on a 12-year orbit at 6 AU from the star. We can expect a series of transits to occur in 2021 as the leading trojan cloud transits the star. Then in 2023, the planet itself should transit.



Apparently their model includes a 4.7 Jupiter-radii planet...

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Re: Did planet hunter discovered a swarm of comets... Or an alien megastructure?

Post by Lazarus on 24th May 2017, 2:35 pm

It's probably worth reading Jason Wright's take on this paper. (Also discusses this paper by J. I. Katz)
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Re: Did planet hunter discovered a swarm of comets... Or an alien megastructure?

Post by Lazarus on 31st May 2017, 6:49 pm

The Trojans paper has been updated, now suggesting that the recent dip may be related to a population of Hilda-analogues. Presumably this is because the secondary eclipse explanation doesn't work.

Within our model, the timing of this event would correspond approximately to the point of opposition of the main body, therefore the corresponding L3 point would be passing in front of the star at this time. In this scenario, this dimming event could be explained by the effect of objects akin to the Hildian asteroids in the Solar System passing through L3. If what we have identified as Trojan asteroid regions are really so populated, in principle one could expect also a rather high population of Hildas. In this case, we would expect a few dimming events concentrated around the time when L3 transits in front of the star. This concentration of events would be, in any case, much fainter than the complex event at D1500 caused by the passage of the Trojans.
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Re: Did planet hunter discovered a swarm of comets... Or an alien megastructure?

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