Planet Hunters Talk

C4 - C13 overlap targets

  • Shellface by Shellface

    After the success of the engineering - C12 thread (here), let's try to repeat that for C13.

    See aja's list for the available targets, and the main C4 thread for previous discussion.

    The C13 field covers roughly two halves of two detectors of C4. The overlap includes several members of the Hyades and a handful of T Tauri stars, as well as a few hundred usual-type K2 targets.

    The deadline for C13 DDT proposals is the 10th of November. This is less pressing than C15, so C13 should perhaps have lower priority up to the end of September.

    Posted

  • Dolorous_Edd by Dolorous_Edd

    Most (all) of them were previously noted here on PH (C4 K2 finds) or in literature , I am aware of that;

    C13 (C4) notable targets:

    Planets:

    210731500-PC period 9.713 (Hans) (also this)

    210771219 - PC? or contamination? 2dips; one at 2259.52 and the other at 2274.05 ( no reference )

    EB's

    210744674 - EB period 25.2 (Hans)

    210734262-EB (Hans)

    210760314-EB single dip at 2248.15 (Hans)

    210779706-EB 2 transits (Hans)

    210664740-EB (Hans)

    210642322-EB (Hans)

    210739713-EB? (Martti)

    Variables:

    210766289 -RR lyr (Martti)

    210754711 -RR lyr (Martti)

    210658099 -GDOR maybe (no ref)

    210689130-GDOR (no ref)

    210745602-GDOR (no ref)

    210689309-GDOR

    210651217 - DSCT

    210758168 - DSCT?

    210716115 - DSCT?

    Various:

    210690462-variable maybe starspots

    210675409-variable maybe starspots

    210636932-variable maybe starspots

    210700559-variable maybe starspots

    210700847-variable maybe starspots

    210709514-variable maybe starspots

    210691271 - flares

    210674207- flares

    210696959 - flares

    Maybe dips:

    210781683 - dip at 2266.78

    210742017 - dips at 2236.84, 2242.66?

    210640877-single dip at 2256.62

    Posted

  • ajamyajax by ajamyajax

    One early mod:

    This C4 target has a database type EXTENDED (all the others are listed as STARs):

    210790374,66.410764,19.722717,16.98,EXTENDED

    Update: this looks like program GO4096 to investigate galaxies for supernovae.

    I should mention that Simbad has several radio sources listed as nearby though (22.56 and 62.55 arcsecs).

    Also a reminder that Aigrain et al have different and sometimes better C4 corrected data to look at also:

    https://archive.stsci.edu/prepds/k2sc/

    https://archive.stsci.edu/k2/hlsp/k2sc/search.php

    Posted

  • Shellface by Shellface in response to Dolorous_Edd's comment.

    EPIC 210731500 turns out to have been validated by Crossfield et al. as K2-87. It is perhaps too faint for RV observations (V = 14.1, with an expected semi-amplitude around 7 m/s), but short cadence photometry may be viable.

    Posted

  • ajamyajax by ajamyajax in response to ajamyajax's comment.

    Update: I also created C4 list CSV output files using the Aigrain corrected data yesterday evening, so here those are in case anyone wants to have a look. EPICs are from the C13 fov list. And these files should be LcViewer and Excel compatible.

    https://www.dropbox.com/s/v4o26ejjn8f5jic/c4_c13.zip?dl=0

    Posted

  • ajamyajax by ajamyajax

    And here are the C4-C13 EVEREST corrected data crossover targets per k2fov.

    https://www.dropbox.com/s/s0hkshl3a9z69js/c4_c13_EVEREST.zip?dl=0

    Credit: Luger et al. 2016, arXiv:1607.00524

    Posted

  • Dolorous_Edd by Dolorous_Edd

    from C4-C13 EVEREST corrected data

    210781683 - looks odd at 2266.80

    210734940 - maybe dip at 2259.6

    210717184 - maybe dip at 2261.76

    210696679 - maybe dip at 2271.84

    210694644 - maybe dip at 2296.49

    210693211 - maybe dip at 2288.76

    210656809 - maybe dip at 2244.38

    210651435 - dips at 2267.91 and 2271.82

    210640966 - dip at 2246.117

    210643901 - 2 dips; at 2255.91 and 2299.045 ; incomplete events

    210645732 - dip at 2247.332 and at 2259.60

    210648987 - maybe dip at 2263.46

    Other

    210754930 - flares

    210744375 - DSCT?

    210709514 - spots

    210678152 - flares

    210674207 - flares

    210655159 - flares

    Glitch

    Dip at 2255.93 - examples 210645948 and 210657134

    Posted

  • ajamyajax by ajamyajax

    All right, SF thinks the Hyades overlap are high-priority targets so here are those requested file matches to consider for C4/C13... Searches were run through the k2fov program and the data format is the usual RA,Dec,magnitude (0.0 if unknown). And if any k2fov target listed isn't on an EPIC list, it means there wasn't a match for that campaign. Also the C4 list wasn't inspected for planet candidates, binaries, etc.

    "A deep all-sky census of the Hyades"

    http://arxiv.org/abs/1105.6093

    And my program's EPIC # find of C4/211084463 appears to be the very close visual companion which is 0.002 arcsecs away from the paper's RA/Dec foreground target (how cool is that?). All the others should be matches at 0.0 arcsecs.

    https://www.dropbox.com/s/p6saeyl8mbrh6tg/Hyades_targets.zip?dl=0

    Posted

  • ajamyajax by ajamyajax

    If it helps, here are the above C4 Hyades target data files in one folder with both EVEREST and Aigrain corrections:

    https://www.dropbox.com/s/je4x1qmhavpmjai/c4_hyades.zip?dl=0

    Posted

  • Shellface by Shellface

    Working on the target list. Some comments on Edd's lists:

    • EPIC 210771219: the dips correlate with systematics, so this is probably just glitchiness
    • EPIC 210781683: this star shows somewhat peculiar variability, including a one noticeable V-shaped dip. In certain parts of the lightcurve a separate set of ~1.5d dips is discernible, but overall high variability in the lightcurve makes this difficult to interpret. I am inclined to suggest this is a blend, but planets are not implausible.
    • EPIC 210742017: this is a Hyad, which explains the fast rotation. The dips mostly match with systematic variability, though one at ~2265.4 does not appear to be a glitch.
    • EPIC 210640877: this appears to match a dip in the raw flux, so it is probably systematics. Nothing appears in the EVEREST reduction.
    • EPIC 210734940: at Kp = 17, the lightcurve scatter is high. Nothing appears in K2SFF, so I am inclined to believe this is a glitch.
    • EPIC 210717184: this is a fast rotator, which seems to cause some problems for the reductions. The dip seen in EVEREST does not appear in K2SFF and appears to match raw variability, so it is a glitch.
    • EPIC 210696679: the dip is coincident with a significant dip in the raw data that is filtered out in K2SFF. (it seems that EVEREST has a tendency to interpret the sharpest systematic variability as physical, which is why they sometimes show in the processed data)
    • EPIC 210694644: the dip appears to be real. It does not appear in K2SFF, but this may be due to confusion with a systematic dip that occurs at about the same time. The dip is shallow (~200 ppm), so if it is planetary the companion is probably small.
    • EPIC 210693211: at Kp = 18 this is an even fainter star. The dip appears to be a glitch,
    • EPIC 210656809: the dip correlates with raw variability, so it is probably a glitch.
    • EPIC 210651435: both dips are irregular and occur at sharp discontinuities in the raw data, so they are best considered processing error glitches.
    • EPIC 210640966: this star is a Hyad, so a planetary transit would be extremely interesting. Unfortunately, the dip appears to be a processing error, due to coincidence with a dip in the raw flux. A similar dip appears in the K2SFF reduction but it has a different depth, suggesting influence by systematics.
    • EPIC 210643901: both dips appear to be glitches; the latter contains only 2 datapoints.
    • EPIC 210645732: the two dips correlate well with dips in the raw data that are filtered out by K2SFF, so the EVEREST dips are glitches.
    • EPIC 210648987: this dip does not match systematics, but as it is very weak (2 points outlying by only ~twice the scatter of the lightcurve), I suspect the appearance of a transit is just a coincidence.

    EVEREST is evidently prone to falsely interpreting systematic variability as physical in some cases. To minimise the effect of this, I suggest comparison with K2SFF (Vanderburg's reduction). As the reduction methods are mostly different, if a dip appears in both it is considerably more likely to be genuine (as opposed to a result of a reduction error).

    Posted

  • Shellface by Shellface

    Here is the target list in its current state. The list contains all of the targets in the overlap (including the galaxy). I have noted all the targets of interest from this thread plus a few more, following the ordering logic from the C12 list - hopefully I didn't miss anything! Credit to Edd and aja for your hard work, and zoo3hans for your work in the original C4 thread.

    Andrew and I are of the opinion that EPIC 210731500 (K2-87) is not worth short cadence - it is faint and somewhat mundane, and there will likely be a high number of SC requests for C13 for Hyades asteroseismology (among other things).

    The target list is mostly ready, so it looks like we'll beat the Thursday deadline. After that, time to work on the big proposals!

    Posted

  • ajamyajax by ajamyajax

    Just fyi, a new k2fov program update (6.2) appears to add a few more c4 crossover targets to c13:

    https://keplergo.arc.nasa.gov/small-changes-to-campaigns-13-14-and-15.html

    210774604

    210790040

    210778340

    210778416

    Posted

  • Dolorous_Edd by Dolorous_Edd

    Likely irrelevant now,but

    210778416 - good looiking dip at 2255.92

    Posted

  • ajamyajax by ajamyajax

    Re 210744674 from our c4/c13 crossover list: all right, have enough c13 raw cadence data to begin to check our deeper transit program candidates and more..
    This target was observed in the paper listed below however and is considered a spectroscopic binary false positive. Also note this depth was calibrated to a previous corrected data level.

    s1=2232.92 p1=25.2194 d1=0.14 (3.36 hours +/-)

    EPIC, 2MASS, J mag, H mag, K mag, J - H, H - K, (J-H spectral type, stellar mass est) (H-K spectral type, stellar mass est)

    210744674 , 2MASS J04232616+1901390 , 11.093 , 10.686 , 10.548 , 0.407 , 0.138 , ('K2V', 0.85) , ('K6V',0.7)

    From NEA, K2 Targets within search area:

    EPIC Number RA [decimal degrees] Dec [decimal degrees] Distance [arc sec] Kepler-band [mag] Campaign Number

    210744674 65.859 19.0275 0.0 12.894 4

    210744674 65.859 19.0275 0.01 12.894 13

    210744375 65.894 19.0235 119.8 11.896 13

    210744375 65.894 19.0235 119.8 11.896 4

    210743439 65.8243 19.0085 136.5 14.073 13

    210743439 65.8243 19.0085 136.5 14.073 4

    210743957 65.9005 19.0166 146.65 12.685 13

    210743957 65.9005 19.0166 146.65 12.685 4

    epic_number,tm_name,ra,dec,k2_teff,k2_rad,k2_mass,k2_kepmag,k2_pmra,k2_pmdec,k2_dist

    210744674,2MASS J04232616+1901390,65.859019,19.027495,6257.00,1.41,1.22,12.894,-3.000,-6.600,450.00

    Aliases

    WISE J042326.16+190138.9

    "197 Candidates and 104 Validated Planets in K2’s First Five Fields"

    https://arxiv.org/pdf/1607.05263.pdf

    RC1

    Posted

  • ajamyajax by ajamyajax

    Re 210664740 from our c4/c13 crossover list: an eclipsing binary with alternating depth transits also identified in the paper below.

    s1=2229.027 p1=0.41495 d1=0.1 (2.4 hours)

    EPIC, 2MASS, J mag, H mag, K mag, J - H, H - K, (J-H spectral type, stellar mass est) (H-K spectral type, stellar mass est)

    210664740 , 2MASS J04291562+1752156 , 9.621 , 9.368 , 9.236 , 0.253 , 0.132 , ('F9V', 1.14) , ('K6V',0.7)

    From NEA, K2 Targets within search area:

    EPIC Number RA [decimal degrees] Dec [decimal degrees] Distance [arc sec] Kepler-band [mag] Campaign Number

    210664740 67.3151 17.871 0.0 10.803 4

    210664740 67.3151 17.871 0.01 10.803 13

    210663968 67.2905 17.8602 92.79 14.526 13

    210666810 67.3379 17.8995 128.76 17.472 4

    210666810 67.3379 17.8995 128.77 17.472 13

    epic_number,tm_name,ra,dec,k2_teff,k2_rad,k2_mass,k2_kepmag,k2_pmra,k2_pmdec,k2_dist

    210664740,2MASS J04291562+1752156,67.315107,17.871013,6576.00,2.17,1.59,10.803,-0.700,-13.900,

    210664740,2MASS J04291562+1752156,67.315107,17.871013,,,,10.803,-0.700,-13.900,361.50

    Aliases

    TYC 1269-257-1

    WISE J042915.62+175215.5

    "Ultra Short Period Planets in K2: SuPerPiG Results for Campaigns 0-5"

    https://arxiv.org/abs/1603.06488

    Also charted by djsimister of old PH talk fame:

    https://talk.planethunters.org/#/boards/BPH0000005/discussions/DPH00019qr

    T1

    Posted

  • zoo3hans by zoo3hans in response to ajamyajax's comment.

    EPIC 210774604 might have a transit in C13 at BKJD 2989.037350, duration 3.4 hours, depth 0.0035.

    210774604

    Posted

  • ajamyajax by ajamyajax

    Re 210642322 from Hans Martin's and Ivan's c4/c13 lists: a faint target at 18.01 kepmag but a possible rare binary of two small dwarfs.
    (Only 2 of 2877 entries in the Prsa V3 EB table have Teff values < the Huber et al. value of 3522K and about 30 of 2877 less than 4105K).

    s1=2231.543 p1=4.33921 d1=0.07 (1.68 hours)

    s2=2233.713 p2=4.33921 d2=0.07 (1.68 hours)

    EPIC, 2MASS, J mag, H mag, K mag, J - H, H - K, (J-H spectral type, stellar mass est) (H-K spectral type, stellar mass est)

    210642322 , 2MASS J04264221+1733478 , 14.622 , 14.024 , 13.745 , 0.598 , 0.279 , ('K5V', 0.75) , ('M3V',0.4)

    From NEA, K2 Targets within search area:

    EPIC Number RA [decimal degrees] Dec [decimal degrees] Distance [arc sec] Kepler-band [mag] Campaign Number

    210642322 66.6759 17.5633 0.0 18.011 4

    210642322 66.6759 17.5633 0.0 18.011 13

    210641603 66.6551 17.5531 80.22 11.254 4

    210641603 66.6551 17.5531 80.23 11.254 13

    210643901 66.6681 17.5854 83.94 14.604 4

    210643901 66.6681 17.5854 83.95 14.604 13

    epic_number,tm_name,ra,dec,k2_teff,k2_rad,k2_mass,k2_kepmag,k2_pmra,k2_pmdec,k2_dist,k2_propid

    210642322,2MASS J04264221+1733478,66.675888,17.563301,3522.00,0.23,0.23,18.011,21.000,15.000,172.10,GO4011_LC

    210642322,2MASS J04264221+1733478,66.675888,17.563301,3522.00,0.23,0.23,18.011,21.000,15.000,172.10,GO13902_LC; GO13904_LC

    Programs:

    c4: GO4011 Beichman A K2 Search for Planets Transiting Bright M Dwarf Stars

    c13: GO13902 Vanderburg Reobserving Targets from K2 Campaign 4 in Campaign 13

    c13: GO13904 GO Office Targets previously observed during C4

    F1

    Posted