Planet Hunters Talk

New K1 periodic transits

  • ajamyajax by ajamyajax

    Just thought I would start a thread for our newer periodic K1 candidates...

    Fairly good indications of at least one longer period transit for KIC 3101007, I think. I see three of four "ok" periodic events around P=258.507 (see charts below). And this period is maintained through a gap also. According to the Archive data, this is a dim 15.88 KepMag star close to a brighter one, so my guess is this is a blending of a larger transiting object with some inclination in its orbit. And the true duration could be a bit greater also. A faint BGEB is also possible, but not much sign of that in my odd/even plot. And other transits here are possible, but this was the only periodic event I could fit here, so far anyway. Also contamination checks are welcome, but please keep in mind blending could affect the MOM centroids etc.

    s1=545.395 p1=258.507 d1=0.28 (6.72 hours)

    (Kepler data for RA/Dec 286.9897,38.2658)

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

    KIC 3101007 [0'] 15.880/4006/0.630* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=3101007

    KIC 3100994 [0.18'] 14.434/4112/0.628* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=3100994

    KIC 3101003 [0.25'] 15.754/5599/0.758* http://archive.stsci.edu/kepler/data_search/search.php?action=Search&ktc_kepler_id=3101003

    ...

    F1
    F2
    T1
    T2
    T3
    T4

    Posted

  • Dolorous_Edd by Dolorous_Edd

    enter image description here

    UKIRT

    A companion to SE? separation ~700mas

    enter image description here

    Keppixseries for Q6 Target pixel file ( a HB?? pules) Optimal apperture has grey background

    enter image description here

    Examination of SAP_QUALITY column around possible transits

    For Q6 at 545 BKJD

    enter image description here

    MOM data check

    enter image description here

    For Q11 at 1062.4 BKJD

    enter image description here

    MOM data

    enter image description here

    For Q14 at 1320.9 BKJD

    enter image description here

    MOM data

    enter image description here

    For Q17 1579.whatever BKJD

    enter image description here

    Posted

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

    FWIW.. perhaps a similar object here, IF a planet: just confirmed Kepler-441 b/KOI-4622 b/K04622.01/KIC 11284772 b (1.64 Re, 0.629X Sol star the most recent entry on NEA) has a period of 207.2482 and a duration of 6.05 hours. (Edit: and the 1062.x transit above could have affected by some flaring activity, or a glitch).

    from January 6, 2015 Exoplanet Archive News:

    http://exoplanetarchive.ipac.caltech.edu/docs/exonews_archive.html#06Jan2015

    Posted

  • ajamyajax by ajamyajax

    Well with an experimental increase in the stellar mass ratio here, my estimate for this possible transit are similar to the period and duration observed. The most recent NEA stellar radii estimate was 0.571X Sol.

    Semi-Major Axis a (A.U.) = 0.75

    Stellar diameter ratio = 0.548

    Stellar mass ratio = 0.842

    Duration ~= 6.72 hours

    Period ~= 258.54 days

    Approx stellar luminosity compared to Earth 0.555

    Approx Venus-Mars habitable zone range (in A.U.) 0.4 to 0.84

    Posted

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

    Update: perhaps the higher stellar mass estimate can be explained by the possible high metal content of this star (0.253 dex on NEA). But at this point still just estimates to consider.

    Update/2: well this probability test narrows the estimated stellar ratios and decreases them a bit, but mass > diameter still favors a higher metal content star for a planet at this ~period and duration.

    P1

    Posted