Eddington artist impression

ESA Eddington - vital statistics3 x 0.9m co-aligned Schmidt telescopes 3 colour filters

Eddington UK PPRP Birmingham 10 Oct 2003

5

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18 x 3Kx2K E2V frame-transfer CCDs 1Mhz (2-8s) readout

Soyuz/Fregat Launch L2 orbit 2008 June 5 (+3?) year mission

FoV=25 sq deg 3 arcsec/pix defocus psf 10-30 arcsec diam

Eddington ScienceDiscovery of Small Planets -- hot and habitable Earths

Eddington UK PPRP Birmingham 10 Oct 2003

Seismology of Stars -- ages for all major stellar populations

yr3field1K3000300 tTrr

Exploration of time domain discovery space

thousands of stellar interior maps 1% ages, metalicities. Mixing/rotation

10-20 fields t=1-3 mo

(Albedo of hot Jupiter atmospheres)

yr3s30~10~ 5 tt

Seismology of Stars

Eddington UK PPRP Birmingham 10 Oct 2003

• stellar interior maps across the H-R diagram - age-rotation (meridional circulation) - low-mass stars (settling of H, metals) - high-mass stars (convective overshooting, . supernova progenitors, yield to ISM)

• 1% ages for Galactic stellar populations

• stellar evolution testbed

• properties of matter under extreme conditions

• Solar chronology in a stellar context

Solar interior rotation

Slow surface rotation at poles

Shear at base of convection zone

Near solid body rotation of core

Pulsating stars span the HR diagram

Eddington will allow to study all possible types of pulsating stars

Eddington will measure stellar interior structures across the entire HR diagram

Inversion of simulated Eddington data for a 1.45 Msun star

Size of convective core determined within 1%!

Edge of convective core to within 1%

Accuracy of stellar parameters

Eddington UK PPRP Birmingham 10 Oct 2003

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For an open cluster with moderate mass stars (e.g. Hyades) with 1) classical observables (UBV,parallax, Fe/H, etc) . 2) frequency separations . 3) detailed inversion from observed frequencies

Eddington Exoplanet Science

Eddington UK PPRP Birmingham 10 Oct 2003

K300T

Discover and characterize a large number and variety of extra-solar planets, including “habitable” worlds.

rr ~Liquid water

Rocky, with atmosphere

Design to detect fN Hp 100

f H habitable planets per star

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HST/FOS lightcurve of HD 209458 transit

Mercury transiting the Sun 15 Nov 1999

Design Goal:to detect Earth analogs

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Eddington history

2000 - selected as an ESA “Reserve” mission

2002 - fully approved for 2008 launch

ESA funds ( 200 Meuro)

-- Spacecraft -- Herschel bus “clone”

-- Payload (built by industry (Alcatel or Astrium)

Eddington baseline payload

• Final definition ongoing!

• White light, wide field photometer

• Multiple (3x) telescopes

• Ca. 0.8 m2 collecting area

• Ca. 20 sq. deg field of view

Eddington data products

• Long-term, highly accurate photometric light curves of selected targets in the field of view– Up to 100,000 targets in PF field, 20,000 in AS

fields– 30 s time resolution in AS fields, 600 s time

resolution in PF field– Photon-noise limited

Eddington baseline observing program

• 5 yr observational lifetime• 3 yr uninterrupted planet-finding observation

– Asteroseismology also performed

• 2 yr total asteroseismic observations– 1-3 months duration typical– Planet-finding also performed

• Can be interleaved• Both key science goals always ‘on’!• Parallel and auxiliary science always ongoing

Eddington, status

• Proposed in early 2000 to ESA as a “flexy-mission” (176 MEur envelope, 192 Meur 2003 value)

• Selected as “reserve” mission in late 2000• Approved in May 2002 as element of ESA’s

‘Cosmic Visions’ science program for launch early 2008

• Currently in a competitive definition phase (“phase B”) with two contractors

• Ready to start the implementation phase (“phase C/D”) in May 2004 for a 2008 launch

Eddington development approach

• Complete mission is ESA-funded and developed under ESA responsibility– S/C (Herschel bus “clone”)– P/L (Built by industry)– Launch– Ground segment (including SOC)

• No dependence on external funding sources

Eddington P/L Consortium

• Key scientific role, no H/W procurement– Defines (together with Science Team) and oversees

instrument specs and development– Develops flight and ground science S/W– Definition and execution of P/L calibration

• Proposal for P/L Consortium received, involves 41 institutions in 11 countries

Eddington Payload Consortium - organigram

UK role in Payload Consortium - CCD characterisation

A community mission

• Fully open data policy– No proprietary rights, data immediately available to

complete ESA scientific community

• Fully open observing program– 1-3 month fields program to be defined by community,

through an AO cycle– 3 yr field being currently being defined by Eddington

community– Ample space for additional science, additional targets

Eddington low-risk approach• S/C and P/L fully scoped (cost, schedule)

by industry– Scientific specs very tight and clear

• High level of definition• High technological maturity

– No development items, no hidden surprises

• As a consequence, no financial risk

Eddington vs Kepler

• 3 x 0.9m ~ 2.3 sq.m• 20 sq deg• 3 colours• L2 orbit

• 1 x 1.2m• 100 sq deg• white light• drift-away orbit

Kepler, status(from the Kepler web site)

• Systems requirements review Oct. 2003

• Preliminary design review Oct. 2004

• Critical design review Aug. 2005

• Launch Oct. 2007

• 60 flight CCDs to be procured (none delivered yet)