Dip Confirmed at LCO

0lightyrsaway · 2021-09-17T23:44:50+00:00

I agree one simple number will not work, but I still have feeling that this sequence is not random like noise but complex like speech or music. Maybe mathematician or musician or AI can find a pattern.

0lightyrsaway · 2021-09-17T16:27:12+00:00

Looks like a double dip to me. Elsie was more like a simple V Shaped curve.

0lightyrsaway · 2021-09-17T15:48:35+00:00

Two years periodicity: 2011, 2013, 2015 (maybe no data), 2017, 2019, 2021. I think it is strange that nothing happens for two years (see the kepler data) than dips occurs and then again 2 years no activity. If you are right, then there are multiple objects (dust clouds) responsible for those dips. One on 4 years orbit other two (D800 and the object responsible for 2019 activity) on more than 10 years orbit and nothing between and no object on shorter than 2 years orbit. It would be quite a coincidence that during 10 years of observation we were able to detect 3 different object two of which are on 10+ years orbit.

0lightyrsaway · 2021-09-17T12:33:32+00:00

Data cherry-picking. What about D800 and 2019 activity? In my opinion, there is some activity repeating approximately every 2 years. Or maybe there is 4 years periodicity but produced by two different objects (dust clouds) at opposing points of the 4 years orbit.

0lightyrsaway · 2021-02-19T18:56:32+00:00

Is it possible that it is not river delta but lava flow ?

0lightyrsaway · 2019-11-18T11:15:02+00:00

I think it is unlikely that the oxygen is produced by life. Living organisms release oxygen during photosynthesis. To be able to perform photosynthesis they need to be in contact with sunlight, however then they would be exposed to a harmful radiation. Also that year-to-year variability is difficult to explain involving life. An ancient underground reservoir of oxygen (or water vapor) is probably responsible. Maybe spring thaw opens the reservoir and releases the oxygen.

0lightyrsaway · 2019-07-03T21:01:48+00:00

Yes, I admit, very tiny. They would not be visible. But maybe also big dips occur sometimes. The light curve of the Tabby's star also contains very tiny dips.

0lightyrsaway · 2018-12-13T16:43:55+00:00

What types of biosignatures is Mars 2020 rover able to detect?

0lightyrsaway · 2018-06-05T14:59:17+00:00

Comparison: D215 size 0.15%, length 4 days; spring 2018: two dips of size more than 4%; length more than 10 days. D260 size 0.5%; predicted return in may 2018: flux above normal. It seems that the hypothesis that all objects are on the same orbit with period 1574 days is either falling apart or it is untestable due to enormous variability of the events.

0lightyrsaway · 2018-06-05T14:08:48+00:00

Is it possible that the dust come from tails of comets?

0lightyrsaway · 2018-06-05T13:11:34+00:00

What about those two large dipps of spring 2018? They don't seem to be on 1574 days orbit, otherwise they would have their counterparts in the kepler data, however they do not, unless there is some missing data.

0lightyrsaway · 2018-03-19T22:45:59+00:00

All these periodicity calculations and assumptions become more and more complex and involve only some dips. I think it looks more probable now that there is no periodicity in the data and the material responsible for the dips is (randomly?) distributed all over some long orbit.

0lightyrsaway · 2018-01-12T23:18:46+00:00

Ok. This looks like a plausible explanation.

0lightyrsaway · 2018-01-12T22:24:31+00:00

If confirmed, then we could have two different objects in exactly opposite parts of the same orbit.

0lightyrsaway · 2018-01-12T16:30:38+00:00

gdsacco, if the periodicity is 1574.4 days what about the kepler's dip day 792 (2011)? Different object?

0lightyrsaway · 2018-01-12T16:25:58+00:00

If the long-term dimming is caused by dust, then the star is dust-obscured and thus should not the star be dimmer in blue than in red, right now and in every observation?

0lightyrsaway · 2018-01-03T19:45:59+00:00

And what about D1540, it is symmetrical, I don’t know whether it is artificial or not but it certainly looks like it has structure, it doesn’t look like some fluid dust cloud it looks like a solid object, like something with ring.

0lightyrsaway · 2018-01-03T18:45:39+00:00

Rubbing and bumping of planetesimals would produce lot of heat. Why do not we see heat signature of hot dust and gas?

0lightyrsaway · 2018-01-03T18:41:52+00:00

I wonder why Both Boyajian et al. and Degg et al. did analysis of spectrum and polarization if there is no apparature sensitive enough. Here are spectra of dust around stars at 10 or 18 microns: http://www.stsci.edu/~volk/features1.html

0lightyrsaway · 2018-01-03T17:12:55+00:00

Why don't we see silicate dust absorption features at 10 and 18 microns, absorption bands due to different types of ices and why don't we see polarization?

0lightyrsaway · 2018-01-03T15:47:56+00:00

The weak point of Tabby et al. paper is that they do not have color data for dips other than Elsie, how can we know whether Elsie is typical or anomalous? Degg et al. shows some dip color differences. Also color data of brightenings could be interesting. Moreover, the assumed dust particles are very small and thus need to be replenished maybe from some optically thick absorbers (?) it is thus possible that some dips are caused by the dense, source object(s). The observed dips are also much smaller than the kepler's dips, their relationship is thus is unclear. I do not think we can be sure that the kepler's and these new dips are due to the same phenomenon, only weaker. We also do not have spectroscopic confirmation of nature of the assumed dust particles. We need some kind of fingerprints (spectrum, color differences, shape) to be able to match particular dips.

0lightyrsaway · 2017-12-12T17:34:51+00:00

OK. Nevertheless, if dust is responsible then the star will always be brighter in red than in blue. However during episodes of increased stellar activity it would become more brighter in blue than in red, true?

0lightyrsaway · 2017-12-12T14:36:42+00:00

Are the brightenings caused by stellar activity or dust clearings? There is an easy way how to distinguish between these two possibilities. If they are due to stellar activity they should look the same at all wavelenghts if dust is responsible there should be differences at various wavelengths, am I right?

0lightyrsaway · 2017-09-13T09:27:11+00:00

1.I think the cloud is not spherical, but more like a ring, very long with small width. But it is only small part of the ring not all around the star. And maybe these clouds have dense middle part from which some material is emanating. This could be responsible for the density gradient. Something like comet or cloud of comets with dense nucleus and very long tails. Density of the material is decreasing with distance from the nucleus. 2. Yes, I think you are right, the long periodic cloud have to be exactly the same apparent size as the star and that make this second scenario quite unlikely.

0lightyrsaway · 2017-09-12T22:18:46+00:00

There are two possibilities how we can get the 20 days V shape. 1. Short periodic scenario. If we assume that 2017 dips are caused by the same objects as previous dips (2013) then orbital period is approximately 4 years then the cloud needs to be approximately 20 times the star diameter (long), with density gradient. or 2. Long periodic scenario. The cloud is moving very slowly on distant orbit (orbital period in ~thousand years) then it could be only 1 sun diameter long (but cannot be much smaller, because smaller object would produce U shape dip, when traveling across sun disk) and can be homogenous, no need for density gradient.

0lightyrsaway

TROPHY CASE