PLAnetary Transits and Oscillations of stars

Transcription

1 PLATO: Contribución n española PLAnetary Transits and Oscillations of stars J. Miguel Mas-Hesse Centro de Astrobiología (CSIC-INTA) 29 de junio 2011

2 Introduction PLATO: PLAnetary Transits and Oscillations of stars Ultra-high precision, long, uninterrupted photometric monitoring of very large samples of bright stars: CoRoT - Kepler heritage. Medium-class candidate mission to the ESA Cosmic Vision programme. Currently under definition study. In competition with: Solar Orbiter (almost pre-selected!) Euclid Decision by ESA in October PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 2

3 Objectives To detect and characterize exoplanets of all kinds, including telluric planets in the habitable zone. To characterize the properties (mass, age, ) of the parent star. Combining photometry (transits + asteroseismology) and radial velocity observations is essential for planet characterization. photometric transits: orbit, radius, inclination stellar photometry: asteroseismology properties of the stars, including their evolutionary state radial velocity follow-up: confirmation, mass planet density, internal structure PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 3

4 Objectives Follow up radial velocity observation will be essential to confirm the exoplanet and to derive its mass (i.e., its density). PLATO is optimized to Monitor bright stars PLATO Kepler PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 4 ESA Cosmic Vision Dec PLATO: PLAnetary Transits and Oscillations of stars 4

5 The PLATO Payload: Optical bench + 32 identical normal telescopes + 2 faster telescopes PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 5

6 The PLATO Payload: Telescopes Very compact design Structure: 4.1 kg Optics: 6.1 kg Baffle: 0.5 kg FPA: 1.3 kg Total: 12.2 kg No focusing mechanism ± 50 µm tolerance Thermal stability PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 6

7 The PLATO Payload: Focal Plane Assembly Being developed by the Spanish team: CAB + LIDAX Goals: Very high thermomechanical stability Large detector area As many pixels as possible Isolation from the electronics PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 7

8 The PLATO Payload: Focal Plane Assembly PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 8

9 The PLATO Payload: Focal Plane Assembly PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 9

10 The PLATO Payload: Focal Plane Assembly PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 10

11 PLATO: CCDs 4 x (4.510 x 4.510) CCDs, 18 µm x 18 µm pixel size Plate scale: ~14.3 arcsec/px Focal planes layout. PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 11

12 On-board data processing Onboard data processing will be one of the hot issues for PLATO 4 CCDs per focal plane, > 80 millions pixels read out and processed every 25 s per telescope ~ objects monitored continuously Fully automatic onboard photometric extraction procedure Cosmic ray rejection, recentering, calibration performed onboard. Coordinated for 32+2 telescopes Final data have to fit within a telemetry rate of ~1.2 Mbps The DPUs are being developed by CAB+IAA+Thales Alenia Espacio PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 12

13 On-board data processing architecture 4510 px PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 13

14 On-board data processing architecture 1 DPU for 2 telescopes 16 normal DPUs PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 14

15 On-board data processing architecture To FEE1 2xSpW (100Mbps) To FEE2 2xSpW (100Mbps) SDRAM (256 MBytes) RMAP1 IP Target & Initiator SRAM (32 MBytes) PROM Mem Ctrller AHB Bridge RMAP2 IP Target & Initiator RMAP3 IP Target & Initiator Memory Bus RMAP4 IP Target & Initiator RMAP5 IP Target & Initiator Synchro & Control AMBA AHB Bus SpW Interfaces Module (RTAX4000 FPGA) N_DPU1 To Router_M To Router_R PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 15

16 Next steps Contribution by the Spanish PLATO group: The Focal Plane Assemblies The DPUs for the normal telescopes Scientific support and algorithms Exoplanet detection (CAB) Asteroseismology (CAB - A. Moya + IAA J.C Suárez) Final decision by ESA: Oct. 4 th PLATO Jornadas Instrumentación J. Miguel Mas-Hesse 16