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Science Planning for a Limited Life2me Mission -
Spitzer Experience
Lisa Storrie-
Lombardi, Spitzer Science Center Asst. Director for Community Affairs


Introduc2on
· Spitzer had a 2.5 year prime mission life2me requirement, goal of 5 years (lasted 5.5)

· Spitzer had no precursor `finder charts' at the sensi2vity levels it would reach · typical science cycle too long for a 2.5 year mission
propose Þ observe Þ analyze Þ publishÞ interpret Þ repeat


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How to Maximize Science?
· Legacy Science Program · First Look Survey · Second-
Look Observa2ons

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Legacy Science Program
· Select large, public programs to execute early in the mission · Require data products to be returned to the archive · Criteria for compe22ve peer review
­ Large, coherent projects, not reproducible by any reasonable number of combinaJon of smaller GO programs ­ General and lasJng importance to the broad astronomical community with the Spitzer observaJonal data yielding a substanJal and coherent database ­ Data public domain immediately upon processing and validaJon, thereby enabling Jmely follow-
up

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Legacy Science Program (2)
· 6 programs, 3160 hours selected in November 2000
­ Launch scheduled for 2001 when call for proposals issued, actual 2003

· Executed in first year of the mission
­ Half of the data in first year was non-
proprietary

· Legacy programs solicited in Cycles 2-
5
­ ConJnued with zero proprietary period and return of enhanced data products

· Legacy enhanced data products are some of the most popular data available in the archive
­ Same experience HST has with deep fields and Treasury programs

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First Look Survey
· First Look Survey (FLS) was designed to provide data to the community that characterized the Spitzer sky · 100 hours of Director's Discre2onary Time
­ 3 components: extragalacJc, galacJc, asteroids ­ ObservaJons and field selecJon based on community input workshops ­ ExecuJon and data reducJon done by the SSC

· First observa2ons executed in nominal opera2ons
­ AVer 60-
day In-
Orbit Check-
out, 30-
day Science VerificaJon phases ­ Early Release ObservaJons primarily executed during IOC and SV
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Second-
Look Observa2ons
· Spitzer cryogenic mission proposals allowed the inclusion of `second-
look' targets
­ Defined as something you could predict but you did not know the target posiJons ­ Used frequently with imaging surveys that proposed second-
look spectroscopic observaJons ­ Did not have to wait for the next cycle to do spectroscopy on all of your targets

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Other Observing Programs
· All other General and Guaranteed Time Observer programs had nominal one-
year proprietary periods

· Many large programs waived the proprietary period (Legacy programs always zero)


· DDT programs have default zero proprietary period
­ Can request a maximum of 90-
days

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Warm Mission
· > 75% of the 2me awarded to > 500 hour programs
­ Default zero proprietary period, can request 90 days

· All other programs have default one-
year proprietary periods
­ Many large ( > 100 hour programs) waive the proprietary period or ask for a shorter period (90-
180 days)

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Landscape in 2003
· HST, Chandra, XMM opera2ng · GALEX launched in April · Spitzer launched in August · SWIFT, Fermi, Kepler, WISE, Herschel, Planck coming in the future
­ SWIFT: 2006, Fermi: 2008, all others launched in 2009

· JWST approved and planned for 2011 launch

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Landscape in 2018
· HST?, Chandra?, TESS opera2ng · HST, Spitzer, Chandra, Kepler, etc. will have provided substan2al ini2al target lists for JWST · At launch, JWST data reduc2on pipelines, tools, etc., should be much more mature leading to a faster turnaround in data observa2on-
to-
publica2on
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Closing Thoughts
· The Spitzer project implemented innova2ve programs to provide data to the community early in the mission to maximize the overall science return · Typical 2me period from observa2on to publica2on is 2-
3 years, regardless of the proprietary period · Need crea2ve policies to address the conflic2ng drivers, provide reward to GTOs, get data out early and prime the follow-
up cycle to accelerate and maximize the science.

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