Terrestrial Planet Finder Coronagraph Mission Study Lessons for

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Terrestrial Planet Finder Coronagraph Mission Study: Lessons for Hab. Ex Karl Stapelfeldt Jet Propulsion

Terrestrial Planet Finder Coronagraph Mission Study: Lessons for Hab. Ex Karl Stapelfeldt Jet Propulsion Laboratory, California Institute of Technology © 2016 California Institute of Technology. Government sponsorship acknowledged

NASA already assessing approaches to exoplanet detection in 1980 http: //history. nasa. gov/SP-436/sp 436.

NASA already assessing approaches to exoplanet detection in 1980 http: //history. nasa. gov/SP-436/sp 436. htm

Terrestrial Planet Finder Study Timeline 1984 beta Pic: first high contrast image of an

Terrestrial Planet Finder Study Timeline 1984 beta Pic: first high contrast image of an exoplanetary system (Smith & Terrile) to 1988 JPL Circumstellar Imaging Telescope study 1990 Analysis of HST optics shows contrast for exoplanets not achievable (Brown & Burrows) 19891995 JPL Astrometric Imaging Telescope study leads to Space Interferometry Mission 1997 Thermal infrared interferometry mission concept (Angel & Woolf) for Terrestrial Planet Finder 2000 Decadal survey endorses TPF tech development 20012002 TPF architecture studies produce coronagraph option. Science Working Group convened 2004 Vision for Space Exploration leads to well-funded TPF-C mission study, STDT & design effort 2006 Study report completed, project shelved, 2010 Decadal survey endorses New Worlds tech development for a habitable exoplanet mission TPF

Relevance of TPF-C study to Hab. Ex • Flagship-class mission optimized for exoplanet direct

Relevance of TPF-C study to Hab. Ex • Flagship-class mission optimized for exoplanet direct imaging, with some general astrophysics • Science case is directly relevant • Some architecture aspects should be relevant • Extensive design and analysis work was done : much more than we can afford in our study • Dates to pre-starshade days: Only internal coronagraphs were considered

Key Notes 8 m x 3. 5 m elliptical primary mirror, 96 x 96

Key Notes 8 m x 3. 5 m elliptical primary mirror, 96 x 96 DM Delta IV heavy launch vehicle STDT report provided baseline, minimum, and desired mission requirements. Conservative 4 /D inner working angle of 65 mas along PSF minor axis Accessible HZs were considered at 0. 5 m: H 2 O at 0. 94 m would not be detectable in many. Lyot coronagraph had low throughput, good insensitivity to low-order aberrations Minimum mission was 4 m circular primary, 2 /D

TPF-C Instrument Concepts No ultraviolet general astronomy capability No near-infrared coronagraph

TPF-C Instrument Concepts No ultraviolet general astronomy capability No near-infrared coronagraph

TPF-C Mag 30 Cam science R. A. Brown et al.

TPF-C Mag 30 Cam science R. A. Brown et al.

Further references • http: //exep. jpl. nasa. gov/reports. And. Documents/ Scroll down to block

Further references • http: //exep. jpl. nasa. gov/reports. And. Documents/ Scroll down to block of 7 public reports & documents • Extensive JPL Docushare library on project engineering efforts • Talk with Jim Kasting, Wes Traub (STDT co-chairs) • Karl, Sara, Jeremy were on the STDT; Olivier worked on an instrument • Many JPL TPF-C participants are still around for consultation on Hab. Ex (Shaklan, Trauger, Lisman, Noecker, …)