E-ELT-HIRES possible design and capabilitiesE. Oliva (INAF-Firenze) B. Delabre (ESO)

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 1

o A very brief overview of what could be done within reasonable technological limits.

o Fundamental approach: highly modular concept.

o Modules and observing modes may be added or removed following a trade-off study between scientific priorities and technical/cost constraints.

E-ELT-HIRES possible scheme of instrument modules

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 2

o 4 Independent fiber-fed spectrometer modules optimized over 4 spectral ranges (UB, VI, YH, K).

o Different observing modes are obtained using different/independent groups of fibers feeding each spectrometer.

o Observing mode is selected in the pre-slit section (fore-optics) of each spectrometer. HR mode has fixed optics stability OK

E-ELT-HIRES possible observing modes

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 3

Mode R (x103) -sampl (pix) D-Fib # Fib Extra infos

HR 100 4(O) 2.7(IR) 0.8” 2 +-cal x6 slicing

MR MOS 14 33(O) 22(IR) 1.0” 10 no slicing

HR2IFU 100 2.7(IR) 0.005” 80 IFU 0.02” x 0.1”

Other possibilities

HHR 130 3(O) 2(IR) 0.6” 2 +-cal x8 slicing

HHHR 200 2(O) 0.8” 1 +-cal x12 slicing

MR MOS 20 28(O) 15(IR) 0.7” 14 no slicing

MR MOS 35 16(O) 9(IR) 0.4” 25 no slicing

HR2MOS 100 2.7(IR) 0.03” 80 MCAO d~1’ fov

E-ELT-HIRES possible observing modes

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 4

o MR-MOS mode for all modules/wavelengths.

o Possibility of parallel modes, e.g. MR-MOS in optical while observing a red object with HR in IR.

o HR2IFU/MOS only in IR where AO correction works.

o Patrol field of MR-MOS mode: depends on where its fibers positioner is located.

E-ELT-HIRES possible scheme of instrument modules

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 5

E-ELT-HIRES possible scheme of one spec-module

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 6

o HR mode has fixed optics stability OK

E-ELT-HIRES possible slit illumination & observing modes

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 7

E-ELT-HIRES spectral format Slit too long for full spectral coverage with 1 channel

14.09.2012 E. Oliva B. Delabre, ELT-HIRES, Cambridge 8

14.09.2012

E-ELT-HIRES spectral format

E. Oliva B. Delabre, ELT-HIRES, Cambridge 9

H 1.45-1.81 morders 74-93

J 1.16-1.38 morders 99-119

Y 0.97-1.14 morders 118-140

14.09.2012

E-ELT fundamental scaling laws

E. Oliva B. Delabre, ELT-HIRES, Cambridge 10

MR-MOS with full spectral coverage (too) many detectors

14.09.2012

E-ELT fundamental scaling laws

E. Oliva B. Delabre, ELT-HIRES, Cambridge 11

Seeing limited spectroscopy challenging optics• cannot get longer slits in one spec-module• cannot fit more fibers/slices in one spec-module