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, ……)

Three Key Elements of Spectrographs

Three Key Elements of Spectrographs

Field of View(Multiplexing)

Spectral Coverage

Spectral Resolution

They are incompatible, competing for (limited) number of detector pixles.

I Want Them All

Three Key Elements of Spectrographs

Field of View(Multiplexing)

Spectral Coverage

By former U.Toronto student R. Chou (WIFIS Optical Design)

Spectral Resolution

I Want Them All

Three Key Elements of Spectrographs

Field of View(Multiplexing)

Spectral Coverage

Pixels are pricy and also noisy.Oversampling doesn’t help.

Spectral Resolution

CCD: ~ 10K Pixel Infrared: H2RG o H4RG

At the University of Toronto:

x Field of View/Multiplexing:Wide Integral Field Infrared Spectrograph (PI)Micro-shutter Array Multi-object Spectrograph (PI) x Broad Spectral Coverage:

Near-Infrared Echelle Spectrograph (& TripleSpec) (co-I)Development of Polarization Grating Based BroadbandSpectroscopic Technique (PI)

NFIRAOS Science Calibration Unit for TMT (PI)(TMT IRMOS, 2005 co-proposer)

Wide Integral Field Infrared Spectrograph (WIFIS)

Current Near-Infrared Integral Field Spectrographs

Wide Integral Field Infrared Spectrograph (WIFIS)

Current Near-Infrared Integral Field Spectrographs

WIFIS

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.

Telescope Focal Plane

Detector

Long slit or Multi-slit mask

Slit mask design

Dispersed Image

Multi-object spectroscopy is now essential and standard in the optical. How about infrared?

Fully addressable NIR Multi-object Spectroscopy

NIR Multi-object Spectroscopy: The MOSFIRE way

Using cryogenic slit mechanism for seeing-limited observations.

NIR Multi-object Spectroscopy: The Microshutter Array way

Using the MEMS Microshutter Array (acting as a source selector) developed for JWST in ground-based AO NIR multi-object spectroscopy o MSAMOS

See presentation by S. Sivanandam for details.

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

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.

Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with EE@NCSU; M. Escuti)

Difficult to make high-throughput gratings covering broad spectral range based on conventional methods (e.g., ruled surface)

Polarization Gratings for High-Throughput Broadband Visible-Infrared Spectroscopy (collaboration with EE@NCSU; M. Escuti)

Polarization gratings of nano-scale structure can diffract all the light into just two orders (r1)o

High-throughput broadband spectroscopy

Achromatic Polarization Gratings

Development at the U.Toronto

Laboratory test (Millar-Blanchaer)

Prototype astronomical spectrograph for visible waveband (being developed).Prototype astronomical spectrograph for visible-infrared waveband (being designed).

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

Moon et al. (2010)

Flat fielding, wavelength calibration, pupil tracking.

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

TMT IRMOS Proposal (2005)

At the University of Toronto:

x Field of View/Multiplexing:- Wide Integral Field Infrared Spectrograph (PI)- Micro-shutter Array Multi-object Spectrograph (PI) x 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)