KID 3831911 has a transit every 30.4838 days.
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by zoo3hans
It has obvious transits in nearly every quarter. For example in Q6.1 at day 6.6, in Q6.2 at day 10.3, in Q6.3 at 10.9, in Q7.1 at 10.4, in Q7.2 at 11.2, in Q7.3 at 8.7, etc. It could be a 1.1 x R_Jupiter planet. In Q16.3 it has even two transits about 3 days apart, so they might be really planetary objects and not just a background EB (UKIRT show a near neighbour).
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by ajamyajax
I updated my VSX-like catalog program to include FP info, and here is what it says:
(Kepler data for RA/Dec 285.0551,38.985)
Kepler KIC# [Angular Separation] Kep Mag/ Teff /Stellar Radius / MAST link*
KIC 3831911 [0'] 15.021/3953/0.804* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=3831911
| KIC 3831911 flagged as False_Positive; KOI 5988.01 (FP) P/E=30.48380824/149.81378; TCE list P/E=30.4838/152.989;
False Positive Reason(s):Significant Secondary;Centroid OffsetPosted
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As AjaMyAjax pointed out there seems to be clear APOs in both MOM_CENTR1 and MOM_CENTR2:
APO:
UKIRT image:
SkyView image (Image Size (degrees): 0.02):
N | Cat | ID/Name | RA/Lon | Dec/Lat | X | Y
1 | http://archive.stsci.edu/kepler/kic10/search.php | 3831911 | 285.0551| 38.9850| 200.0| 200.0
2 | http://archive.stsci.edu/kepler/kic10/search.php | 3831909 | 285.0547| 38.9874| 207.5| 247.4
3 | http://archive.stsci.edu/kepler/kic10/search.php | 3831931 | 285.0615| 38.9844| 100.4| 188.3
4 | http://archive.stsci.edu/kepler/kic10/search.php | 3831924 | 285.0603| 38.9808| 119.5| 116.6
5 | http://archive.stsci.edu/kepler/kic10/search.php | 3831892 | 285.0478| 38.9833| 313.6| 165.5
6 | http://archive.stsci.edu/kepler/kic10/search.php | 3831905 | 285.0529| 38.9786| 234.2| 71.1
7 | http://archive.stsci.edu/kepler/kic10/search.php | 3831919 | 285.0584| 38.9788| 149.0| 75.7
8 | http://archive.stsci.edu/kepler/kic10/search.php | 3831926 | 285.0606| 38.9911| 114.6| 320.9
9 | http://archive.stsci.edu/kepler/kic10/search.php | 3831940 | 285.0652| 38.9862| 42.9| 224.5
10 | http://archive.stsci.edu/kepler/kic10/search.php | 3831901 | 285.0508| 38.9933| 267.2| 364.8
11 | http://archive.stsci.edu/kepler/kic10/search.php | 3831918 | 285.0582| 38.9761| 151.9| 20.9
12 | http://archive.stsci.edu/kepler/kic10/search.php | 3831903 | 285.0510| 38.9942| 263.6| 383.6
13 | http://archive.stsci.edu/kepler/kic10/search.php | 3831902 | 285.0510| 38.9948| 264.4| 394.9
14 | http://archive.stsci.edu/kepler/kic10/search.php | 3831948 | 285.0676| 38.9771| 5.8| 41.4
Star #1 is the only Kepler Target.
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by zoo3hans
Ok, so it seems to be contamination. We have again in Q14.2 two transits spaced about 3.2 days apart: at 1.6, 4.8, 31.15. So we see the 30.4838 day period at 1.6 and 31.15, but 3.2 days after the first #transit we have another at 4.8, which seems to be the secondary transit (actually 3.175 days later according to the TCE list). The contaminating EB must be very eccentrical.
Posted
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by ajamyajax
Yeah, looks like an eccentric eb contaminator which I hope can be seen in the first chart's transit pairings. Two objects seem likely with different duration fits in such plots too (~2.16 hours vs. ~3.2 hours). Also the shallowness of the V-shaped transits and the variation in transit depths suggest blending of larger objects than the depth here indicates. The star's radius estimates were reduced from 0.804X Sol originally to 0.53X Sol in NEA, and that is what I used for that calculation or estimate.
And I wish I could work up a possible co-orbitals speculation here, but two planets just seems a lot less likely than an eccentric eb, in my opinion.
p.s. here is a link to a Wiki animation which might illustrate such orbits, as seen edge-on by Kepler.
"Orbit5" by User:Zhatt - Own work. Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Orbit5.gif#mediaviewer/File:Orbit5.gif
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