Science

discussion

KID 9718379 KOI 2379.01

Started by troyw
Default_user
over 6 years ago

I am not sure what to make of the image produced by AKO. There are 2 transit lines when this data is lined up to 40.00728 days for 2379.01

EB? Trojan planet? The 2 transit lines are very close together.

Any ideas?

Default_user
over 6 years ago

Skyview from Hans:

http://talk.planethunters.org/objects/APH21034079/discussions/DPH101e66c

Default_user
over 6 years ago

This KOI is continuing it's double transit feature into Q9:

Contamination? Binary planets? Death star? Opinions please.

Default_user
over 6 years ago

Well, this KPC certainly blends into the flux from time to time... Only this one looked fairly regular to me. I didn't see any obvious contaminators in the neighborhood, but as you know it is always possible what you see comes from a faint BGEB, or a charge bleed from far away. Sorry I didn't see anything more definitive.

Kepler KID# [Angular Separation] Kep Mag/ Teff /Stellar Radius* / MAST link

KID 9718379 [0'] 15.040/5975/1.088* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718379

| KID 9718379 flagged as Planetary_candidate

KID 9718381 [0.37'] 15.141/5304/1.080* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718381

KID 9718357 [0.44'] 15.690/5523/0.967* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718357

KID 9718393 [0.92'] 15.585/5204/0.798* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718393

KID 9718313 [1.23'] 15.508/5800/1.102* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718313

KID 9718449 [1.26'] 14.997/5758/1.019* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=9718449

Default_user
over 6 years ago

Thanks for checking, Aja. I've been trying to imagine what a binary planet situation might look like in a data set, and I don't think it would be like this. It seems like the orbital dynamics of such a system would produce a data set where both set of transits would shift closer to or farther away from each other in terms of separation of transits (Depending on how quickly the two bodies orbit each other). It does seem like the 4 day separation between transits would change somehow. Still, they could produce transits in a separation that doesn't change much if the bodies orbit with each other in some strange resonance with the their own collective orbital period around the parent star. An extremely eccentric EB would be fascinating as well.

Default_user
over 6 years ago

Troy, don't forget about this one: looks like you and AKO saw something I missed here -- and/or your software works like theirs does -- because the Threshold Crossing Event list has two very similar period entries to investigate for KID 9718379:

13944,9718379,1,40.007700,141.753,4.5620e+02,2.9620,0.0571800,5.6750000e-02,89.970,0.23740,0,0,105.0544700000,0.01962401800,2.34100,5.94e+02,6274.00,4.41,1.093,-0.200,10-DEC-2012

13945,9718379,2,40.007900,137.235,3.7540e+02,2.3080,0.0496200,4.1720000e-01,89.810,0.23740,0,0,122.9800700000,0.01814523700,2.16400,5.94e+02,6274.00,4.41,1.093,-0.200,10-DEC-2012

Well spotted! And many thanks for the heads up on the TCE list (and it being posted; thanks to NHB as well). That will keep us busy for a while.

Default_user
over 6 years ago

Oh, this could be quite interesting. Scenarios I can imagine:

  • something like the "shepherd" moons of Saturn, where two moons have an almost identical orbit and one overtakes the other

  • a very eccentric EB

  • some weird mean motion resonance, where one is actually almost exactly double the period of the other.

Default_user
over 6 years ago

Just trying to help a bit.. With these short duration eclipses that also blend into the flux, it could be tough to determine if a PC or a BGEB or ?. But we'll have the same issue with other small transits, so I guess we have to work on that... Notice the second object here looks a little smaller than the first. Edit: maybe this would fit the pattern of a very eccentric EB. So maybe we can use phase charts to help identify these small transits... The amount of blending per eclipse varies also, so that's another factor. Just an observation based on what we have so far. Also these are transiting about 4.518d apart based on the epoch values. Edit: I still hope these signals are two small near Earth-sized PC's instead of an EB, because that would be more interesting. :))

[TCE # 13944 Epoch 141.753 Period 40.0077]

imgur1

[TCE # 13945 Epoch 137.235 Period 40.0079]

imgur2

Default_user
almost 6 years ago

AKO image to Q15:

I had the idea that maybe this could be a companion in the lagrangian point L4 or L5 of this possible candidate. I figured that if the epoch of the possible smaller body was exactly the planet epoch of the larger body minus 1/6th the period, that would be something to make me go hmmmmm. However, the epoch of the smaller body would have to be 2.15295 days earlier than it is.

AKO link

Default_user
over 5 years ago

Troy, just noticed KOI 2379 mentioned briefly in this study. Looks like your trojan planet idea back then was a good one. If any other ideas, maybe tell the scientists.

"A Systematic Search for Trojan Planets in the Kepler data"

http://arxiv.org/pdf/1307.7161v1.pdf

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