New C0 K2 EB's
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Here are some new EB's using Al Schmitt's LcViewer and 7,743 Campaign 0 light curves for the K2 project. Andrew Vanderburg (Harvard-Smithsonian Center for Astrophysics) has graciously provided Al with his latest corrected light curve files.
These all start with 2020...
59291, 59360, 59433, 60124, 60136, 60198, 60447, 60506, 60551, 60680,
60752, 60911, 61226, 62176, 62450, 63160, 63828, 64026, 64549,
65543, 65545, 65819, 65879, 65929, 66041, 66192, 66394, 66537, 66699,
66811, 67425, 68686, 68807, 70263, 71289, 71505, 71579, 71631, 71684
71731, 71842, 71945, 71994, 72061, 72430, 72451, 72485, 72486,72502,
72563, 72596, 72624, 72704, 72929, 72932, 72933, 72940, 72941, 72947,
72958, 72959, 72961, 72962, 72963, 72965, 72966, 72971, 72972, 72978,
72982, 72988, 72991, 72992, 73003, 73004, 73040, 73043, 73061, 73063
73064, 73067, 73068, 73074,73088, 73096, 73117,73121, 73124, 73125,
73135, 73144, 73145, 7312, 73154, 73160, 73161, 73174, 73175, 73185,
73186, 73203, 73027, 73210, 73217, 73218, 73218, 73235, 73238, 73248,
73262, 73267, 73270, 73279, 73434, 73438, 73440, 73445, 73490, 73495
74775, 83021, 83222, 83510, 83650, 83824, 84111, 85432, 85597, 85698
86223, 86225, 86627, 86968, 87156,87553, 87711, 88178, 88191, 88212,
88387,89962,91203, 91228, 91404, 91456, 91524, 91545, 92480, 92530,
92631, 92842, 93033, 93968, 94234, 95298These all start with 2021...
03762, 22546, 26825, 26851, 26853, 26864, 26866, 26867, 26876,
26878, 26880, 26884, 26886, 26888, 36008, 36063, 36445, 37571, 39294Posted
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These new EB's are are a target rich environment to check for ETVs with AKO.
Posted
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by troyw
202073145 Appears to be a 3 body system or a blend of two targets.
The EB has a period of 1.516885 days and the 3rd body has a period of 4.411. The shape look stellar, and I didn't see any ETVs associated.
I didn't see any other signs of ETV in the 2020 series you posted.
Posted
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by robert_gagliano in response to troyw's comment.
There are apparent 3rd transits @ 1942.2, 1946.8, 1951.0, 1955.4, 1959.8, 1964.3, 1968.8 which roughly correlates with your calculated period. Could this be an EB with a transiting exoplanet?
UKRIT 202073145
Posted
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by troyw
I'm not sure... The apeture is small.
I took apart the star that is above the apeture and saw a blend of the target star, but no hint of transits @ 4.411(which is good!) Extracting the area beneath the appeture showed the same blend. Either it is a BG EB (the shape does seem stellar, but this could be distorted by the 1.51 transits) or a triple stellar system with a 1:2.9 periodic ratio, or planetary. Some one with more expertise should take a look. Let's hope for the best!
EDIT: Wow, that is one crowded bunch. I think I see a secondary eclipse on the 4.411 period after deleting all the other transits:
I would say that this is probably a blend of the main target and one of those little targets.
Posted
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by ajamyajax
Well, fwiw I removed the approx. range of transit overlap data near the P=4.441 object and the result is the first plot below. As you can see maybe still some spurious data remains, so I removed those points also and the result is the second plot. As you can see in both the transits seem to be very deep. So if not blended objects my guess is this is a trinary, or a blending of two eb's as Troy indicates is possible.
Transit/eclipse overlap data range visually identified and then removed:
[1942.18 to 1942.41, 1946.728 to 1946.958, 1951.28 to 1951.51, 1959.673 to 1959.883, 1964.22 to 1964.44, 1968.767 to 1968.987 BJD]
Possible spurious data removed by program subroutine:
[1950.993917 to 1951.298083 BJD]
[1955.404917 to 1955.709083 BJD]
K2 corrected light curve data credit: Vanderburg & Johnson (2014)
Posted
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by troyw
202065879, 202066041, and 202065929 are all the same EB.
Posted
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by ajamyajax in response to troyw's comment.
I asked Andrew what he thought of EPIC 202073145 (I'm the one who suggested it's a mystery) and here is his reply:
That's an interesting object! At first glance, it suggests a triple system, because the period ratio is kind of suggestive (close to an integer multiple
evidently). But I can't figure out how that configuration would be stable... The chance alignment of two eclipsing binaries of the same magnitude basically within such a small area of sky seems rather unlikely, and the fact that the eclipses have about the same duration suggests that it couldn't be a foreground dwarf star binary and a background giant star binary. So it would have to be a close quadruple system in which both components are eclipsing. Seems a bit contrived.This is evidently a known eclipsing binary system, based on the proposals that sent it in. I checked Simbad and it has no "references", so it might not be a known triple system. Maybe there is some other place that would describe it.
Have you checked other stars within the aperture? Anything within 10 arcseconds would be smeared together with the target star, even though the K2 aperture is rather small in this case. I checked my other apertures, and the other eclipses appear not to be data artifacts.
The best way to figure it out would probably be spectroscopy. If you see 3 sets of lines, it's likely a triple. If you see 4 sets, then its likely a double eclipsing binary.
Yep, this is quite a mystery!
AndrewPosted
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by JKD
202064549 = EB with p=9.827d having a third object at 1941.38 BKJD with a transit duration of 0.204d and a delta Flux of 0.002588
Posted
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by JKD
202067744 - #transit at 1962.042 BKJD
Posted
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by JKD
202071842 - EB with a third object transit feature at 1969.31 BKJD
Posted
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by Dolorous_Edd in response to JKD's comment.
Glitch, apparently ain't the first one I see here with dip @1969.3
Posted
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by ajamyajax in response to ajamyajax's comment.
And almost forgot, but here is the SkyView data for 202073145. Note the URL here works in SkyView's Catalog Overlays/Vizier Catalog or Catalog URL .
Hope it helps.N | Cat | ID/Name | RA/Lon | Dec/Lat | X | Y
1 | http://archive.stsci.edu/k2/epic/search.php? | 202073145 | 94.7292| 20.5986| 150.0| 150.0
2 | http://archive.stsci.edu/k2/epic/search.php? | 208352376 | 94.7276| 20.6011| 158.6| 164.7
3 | http://archive.stsci.edu/k2/epic/search.php? | 208351664 | 94.7255| 20.5983| 170.7| 148.4
4 | http://archive.stsci.edu/k2/epic/search.php? | 208352293 | 94.7261| 20.6007| 167.2| 162.8
5 | http://archive.stsci.edu/k2/epic/search.php? | 208351103 | 94.7349| 20.5962| 117.8| 135.4
6 | http://archive.stsci.edu/k2/epic/search.php? | 208351547 | 94.7220| 20.5979| 190.2| 145.6
7 | http://archive.stsci.edu/k2/epic/search.php? | 208354401 | 94.7211| 20.6088| 195.3| 211.3
8 | http://archive.stsci.edu/k2/epic/search.php? | 208350647 | 94.7423| 20.5943| 76.1| 124.2
9 | http://archive.stsci.edu/k2/epic/search.php? | 208349210 | 94.7199| 20.5887| 202.2| 90.7
10 | http://archive.stsci.edu/k2/epic/search.php? | 208348529 | 94.7334| 20.5860| 126.1| 74.5
11 | http://archive.stsci.edu/k2/epic/search.php? | 208353139 | 94.7434| 20.6040| 70.2| 182.4
12 | http://archive.stsci.edu/k2/epic/search.php? | 208353088 | 94.7450| 20.6038| 61.3| 181.2
13 | http://archive.stsci.edu/k2/epic/search.php? | 208348383 | 94.7199| 20.5853| 201.8| 70.0
14 | http://archive.stsci.edu/k2/epic/search.php? | 208354781 | 94.7410| 20.6103| 83.8| 220.3
15 | http://archive.stsci.edu/k2/epic/search.php? | 208348728 | 94.7175| 20.5868| 215.6| 78.9
16 | http://archive.stsci.edu/k2/epic/search.php? | 208350619 | 94.7121| 20.5942| 245.6| 123.6
17 | http://archive.stsci.edu/k2/epic/search.php? | 208350728 | 94.7465| 20.5947| 52.6| 126.3
18 | http://archive.stsci.edu/k2/epic/search.php? | 208355157 | 94.7180| 20.6118| 212.8| 229.1
19 | http://archive.stsci.edu/k2/epic/search.php? | 208347467 | 94.7266| 20.5816| 164.2| 48.2
20 | http://archive.stsci.edu/k2/epic/search.php? | 208351532 | 94.7476| 20.5978| 46.3| 145.2
21 | http://archive.stsci.edu/k2/epic/search.php? | 208350303 | 94.7103| 20.5931| 255.8| 116.7
22 | http://archive.stsci.edu/k2/epic/search.php? | 208356407 | 94.7237| 20.6167| 180.5| 258.6
23 | http://archive.stsci.edu/k2/epic/search.php? | 208351617 | 94.7495| 20.5982| 35.7| 147.3
24 | http://archive.stsci.edu/k2/epic/search.php? | 208349711 | 94.7478| 20.5907| 45.5| 102.5
25 | http://archive.stsci.edu/k2/epic/search.php? | 208347320 | 94.7376| 20.5811| 102.4| 44.8
26 | http://archive.stsci.edu/k2/epic/search.php? | 208349473 | 94.7474| 20.5897| 47.4| 96.8
27 | http://archive.stsci.edu/k2/epic/search.php? | 208352431 | 94.7505| 20.6013| 30.1| 166.0
28 | http://archive.stsci.edu/k2/epic/search.php? | 208349236 | 94.7481| 20.5889| 43.7| 91.5
29 | http://archive.stsci.edu/k2/epic/search.php? | 208348441 | 94.7461| 20.5856| 55.1| 71.9
30 | http://archive.stsci.edu/k2/epic/search.php? | 208355898 | 94.7152| 20.6147| 228.6| 246.3
31 | http://archive.stsci.edu/k2/epic/search.php? | 208357133 | 94.7303| 20.6196| 143.6| 275.8
32 | http://archive.stsci.edu/k2/epic/search.php? | 208351405 | 94.7059| 20.5973| 280.8| 142.2
33 | http://archive.stsci.edu/k2/epic/search.php? | 208347859 | 94.7459| 20.5832| 55.9| 57.4
34 | http://archive.stsci.edu/k2/epic/search.php? | 208356763 | 94.7406| 20.6182| 86.0| 267.5
35 | http://archive.stsci.edu/k2/epic/search.php? | 208357496 | 94.7308| 20.6211| 140.9| 284.9
36 | http://archive.stsci.edu/k2/epic/search.php? | 208350267 | 94.7530| 20.5929| 15.9| 115.5
37 | http://archive.stsci.edu/k2/epic/search.php? | 208353651 | 94.7054| 20.6061| 283.3| 194.8
38 | http://archive.stsci.edu/k2/epic/search.php? | 208346962 | 94.7145| 20.5796| 232.6| 36.0
39 | http://archive.stsci.edu/k2/epic/search.php? | 208350953 | 94.7542| 20.5956| 9.5| 131.7
40 | http://archive.stsci.edu/k2/epic/search.php? | 208357105 | 94.7163| 20.6195| 222.2| 275.2
41 | http://archive.stsci.edu/k2/epic/search.php? | 208355995 | 94.7483| 20.6151| 42.8| 248.6
42 | http://archive.stsci.edu/k2/epic/search.php? | 208356379 | 94.7471| 20.6166| 49.2| 257.9
43 | http://archive.stsci.edu/k2/epic/search.php? | 208345932 | 94.7194| 20.5755| 204.7| 11.5
44 | http://archive.stsci.edu/k2/epic/search.php? | 208345672 | 94.7200| 20.5745| 201.5| 5.5
45 | http://archive.stsci.edu/k2/epic/search.php? | 208346716 | 94.7111| 20.5786| 251.7| 30.2
46 | http://archive.stsci.edu/k2/epic/search.php? | 208356110 | 94.7513| 20.6156| 25.7| 251.7
47 | http://archive.stsci.edu/k2/epic/search.php? | 208348234 | 94.7538| 20.5847| 11.7| 66.4
48 | http://archive.stsci.edu/k2/epic/search.php? | 208347052 | 94.7503| 20.5799| 31.3| 37.8
49 | http://archive.stsci.edu/k2/epic/search.php? | 208355126 | 94.7548| 20.6117| 6.0| 228.3
50 | http://archive.stsci.edu/k2/epic/search.php? | 208346087 | 94.7463| 20.5761| 54.0| 15.0
51 | http://archive.stsci.edu/k2/epic/search.php? | 208347624 | 94.7531| 20.5822| 15.9| 51.6
52 | http://archive.stsci.edu/k2/epic/search.php? | 208355879 | 94.7045| 20.6146| 288.4| 245.6
53 | http://archive.stsci.edu/k2/epic/search.php? | 208346458 | 94.7496| 20.5776| 35.5| 23.9
54 | http://archive.stsci.edu/k2/epic/search.php? | 208347331 | 94.7546| 20.5811| 7.3| 45.2
55 | http://archive.stsci.edu/k2/epic/search.php? | 208345494 | 94.7097| 20.5738| 259.3| 1.3
56 | http://archive.stsci.edu/k2/epic/search.php? | 208346730 | 94.7545| 20.5787| 7.7| 30.6
57 | http://archive.stsci.edu/k2/epic/search.php? | 208356901 | 94.7037| 20.6187| 292.8| 270.6
Posted
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by ajamyajax
Possible new c0 eb here:
202091514
(the others were already on Robert's abbreviated list)
Posted
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by JKD
KID 202091514 - no doubt this is an EB
Posted