Targets for JWST: Kepler and K2 Steve B. Howell NASA Ames Research Center 11-13 March 2014.

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Presentation transcript:

Targets for JWST: Kepler and K2 Steve B. Howell NASA Ames Research Center March 2014

JWST Transit Planning Meeting, March Q1-Q12 Planet Candidates

JWST Transit Planning Meeting, March Kepler Planets: Habitable Zone, Frequency 3 Approximately 50% of M dwarfs harbor a planet smaller than 1.4 R e in the HZ (Dressing & Charbonneau 2013; Kopparapu 2013; Gaidos (2013) Approximately 7% of G & K dwarfs harbor a planet smaller than 1.4 R e in the HZ (Petigura et al. 2013) based on results from independent pipeline, extrapolated to longer orbital periods.

JWST Transit Planning Meeting, March Kepler Input Stars Radius vs. effective temperature of the ~190,000 stars observed by Kepler during the prime mission. The upper panel shows the properties that were used for the 12 quarter software pipeline run. The lower panel shows the properties that were used for the 16 quarter pipeline run. Figure taken from Huber et al

JWST Transit Planning Meeting, March Kepler KOIs: Teff vs. Kep Mag 5

JWST Transit Planning Meeting, March Kepler KOIs: log g vs. KepMag 6 Log g

JWST Transit Planning Meeting, March K2 Ecliptic Mission Concept 7 Use solar pressure as “third wheel” View series of ecliptic fields Each field in-view for ~83 days Described in Howell et al., 2014, In PASP (arXiv: )

JWST Transit Planning Meeting, March Schematic K2 campaign 8 Science time per campaign is ~75 days. Science data downlink takes ~1-2 days. Campaign 0, an engineering campaign, underway now.

JWST Transit Planning Meeting, March K2 Fields – Next 2 years 9 Fields planned “around” field 4, stepping back and forward by 83 days. Final adjustments for each field happens (6 months ahead) as they come along. All targets from peer-reviewed community proposals, no proprietary data.

JWST Transit Planning Meeting, March K2 Detection Space / M stars 10 K2 detection space: 3 transits at 80 ppm, 6hr. mean ~4000 M stars / field M star rocky planets: ~50 / year Need spectra for all host stars

JWST Transit Planning Meeting, March K2 Bright Stars 11 K2 detection space for bright stars and 10 transits V<12 stars / campaign ~50 bright star planets/year Probe transition region: gas to ice to rocky

JWST Transit Planning Meeting, March K2 Noise Level – Prelim 12

JWST Transit Planning Meeting, March K2 Engineering Data – WASP 28b 13

JWST Transit Planning Meeting, March WASP 28b 14 WASP 28b – three transits Point-to-point (rms) scatter of 0.12%. 6-hr integrated noise level = 84 ppm.