Spitzer Space Telescope Spitzer Meets K2 M.Werner, J.Livingston, V.Gorjian, JPL/Caltech; C.Beichman,...

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Transcript of Spitzer Space Telescope Spitzer Meets K2 M.Werner, J.Livingston, V.Gorjian, JPL/Caltech; C.Beichman,...

  • Spitzer Confirmation of the Transiting Habitable Zone Super-Earth K2-18b Bjoern Benneke

    K2-18b is the first habitable zone exoplanet amenable to atmospheric characterizationOnly two transits observed by K2Earth: 1370 W/m2K2-18b: 1300 W/m2K2-18

  • Spitzer Detection of Third TransitTransit occurs 7 (1.8 hours) before predicted transit time! Spitzer transit will constrain eclipse/planet geometry much more effectively than did the K2 observations alone.Predictedmid-transit timebased on K2(Montet et al. 2015)

  • Global Analysis of K2 + Spitzer PhotometryPreviously unidentified outlier in K2 data led to inaccurate ephemerisNo TTVK2Spitzer

  • K2-18b would have been lost for future characterizationsLong observation time possible from Spitzer facilitated recoveryEphemeris from K2 could have led to non-detections with HST and JWST

    Spitzer Space Telescope

    Summary of Initial ResultsSpitzer at 4.5um confirms K2 measurements of transit depths for exoplanets K2-3 b,c,d; K2-18b; and 20208328b

    Further analysis of Spitzer data will provide improved constraints on transit geometry and exoplanet properties for these and other systems, including small HZ planetsTTV analysis of K2-3 system in process by Kat Deck, results to be included in Beichman et al paper

    First round of Spitzer measurements reduce uncertainty in transit times for JWST era. Most dramatically, the transits of K2-18b will occur ~six hours earlier at the time of the JWST launch than K2 ephemeris alone would predict

    Spitzer Space Telescope

    K2-3b is a Promising Target for JWST SpectroscopySimulations by Mike Line and Tom Greene of the JWST transmission spectrum of K2-3b for several atmosphere models

    Spitzer Space Telescope

    ConclusionsSpitzer followup of K2 promises to be very productive scientifically and to set the stage for JWST

    Observations of K2-3, K2-18b, & 20209328b have:Confirmed transit depthsProvided better data for exoplanet characterizationImproved ephemerides for JWST work

    Future plans8 additional exoplanets already queued up for observation Several hundred hours still to be scheduled we invite suggestions of targets we may overlook Program expanded to include FGK starsExtend Spitzer through Senior Review to go beyond K2 field 5

    Spitzer Space Telescope

    K2 Exoplanets observed or currently planned for observation with SpitzerK2-22b

    Transiting bright nearby M2 dwarf