Overview of Instrumentation Programs for Infrared Spectroscopy at the U.Toronto

Transcription

1 Overview of Instrumentation Programs for Infrared Spectroscopy at the U.Toronto Dae-Sik Moon (Univ. of Toronto) (S. Sivanandam, E. Meyer, M. Millar-Blanchaer, J. Jilcote, J. Miranda, )

2 Three Key Elements of Spectrographs

3 Three Key Elements of Spectrographs Field of View (Multiplexing) Spectral Resolution Spectral Coverage They are incompatible, competing for (limited) number of detector pixles.

4 Three Key Elements of Spectrographs Field of View (Multiplexing) Spectral Resolution I Want Them All Spectral Coverage By former U.Toronto student R. Chou (WIFIS Optical Design)

5 Three Key Elements of Spectrographs Field of View (Multiplexing) Spectral Resolution I Want Them All Spectral Coverage Pixels are pricy and also noisy. Oversampling doesn t help.

6 CCD: ~ 10K Pixel Infrared: H2RG H4RG

7 At the University of Toronto: Field of View/Multiplexing: Wide Integral Field Infrared Spectrograph (PI) Micro-shutter Array Multi-object Spectrograph (PI) Broad Spectral Coverage: Near-Infrared Echelle Spectrograph (& TripleSpec) (co-i) Development of Polarization Grating Based Broadband Spectroscopic Technique (PI) NFIRAOS Science Calibration Unit for TMT (PI) (TMT IRMOS, 2005 co-proposer)

8 Wide Integral Field Infrared Spectrograph (WIFIS) Current Near-Infrared Integral Field Spectrographs

9 Wide Integral Field Infrared Spectrograph (WIFIS) WIFIS Current Near-Infrared Integral Field Spectrographs

10 Wide Integral Field Infrared Spectrograph (WIFIS) Developed mostly by students and postdocs at the U.Toronto, starting from optical design See presentation by S. Sivanandam for details.

11 Fully addressable NIR Multi-object Spectroscopy Detector Slit mask design Telescope Focal Plane Dispersed Image Long slit or Multi-slit mask Multi-object spectroscopy is now essential and standard in the optical. How about infrared?

12 NIR Multi-object Spectroscopy: The MOSFIRE way Using cryogenic slit mechanism for seeing-limited observations.

13 See presentation by S. Sivanandam for details. NIR Multi-object Spectroscopy: The Microshutter Array way Using the MEMS Microshutter Array (acting as a source selector) developed for JWST in groundbased AO NIR multi-object spectroscopy MSAMOS

14 Cross-dispersed Echelle Spectrographs fro Broad Spectral Coverage: NIRES on Keck / Triplespec on Palomar

15 Cross-dispersed Echelle Spectrographs fro Broad Spectral Coverage: NIRES on Keck / Triplespec on Palomar High-z objects, SNe/GRBs, Highly Obscured Objects, New objects, etc.

16 Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with M. Escuti) Difficult to make high-throughput gratings covering broad spectral range based on conventional methods (e.g., ruled surface)

17 Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with M. Escuti) Polarization gratings of nanoscale structure can diffract all the light into just two orders ( 1) High-throughput broadband spectroscopy

18 Achromatic Polarization Gratings

19 Development at the U.Toronto Laboratory test (Millar-Blanchaer) Prototype astronomical spectrograph for visible waveband (being developed). Prototype astronomical spectrograph for visibleinfrared waveband (being designed).

20 TMT Science Calibration Unit for Adaptive Optics and Near-Infrared Instruments Flat fielding, wavelength calibration, pupil tracking. Moon et al. (2010)

21 TMT Science Calibration Unit for Adaptive Optics and Near-Infrared Instruments

22 TMT IRMOS Proposal (2005)

23 At the University of Toronto: Field of View/Multiplexing: - Wide Integral Field Infrared Spectrograph (PI) - Micro-shutter Array Multi-object Spectrograph (PI) Broad Spectral Coverage: - Near-Infrared Echelle Spectrograph (& TripleSpec) (co-i) - Development of Polarization Grating Based Broadband Spectroscopic Technique (PI) NFIRAOS Science Calibration Unit for TMT (PI) (TMT IRMOS, 2005 proposal)