Astronomical Spectroscopy with Skipper CCDs: First Results from a Skipper CCD Focal Plane Prototype at SIFS
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2024
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| author | Villalpando, Edgar Marrufo Drlica-Wagner, Alex Roach, Brandon Bonati, Marco Bakshi, Abhishek Campa, Julia Cancelo, Gustavo Cancino, Braulio Chavez, Claudio R. Chierchie, Fernando Estrada, Juan Moroni, Guillermo Fernandez Fraga, Luciano Gaido, Manuel E. Holland, Stephen E. Hur, Rachel Jonas, Michelle Moore, Peter Paolini, Eduardo Malagón, Andrés A. Plazas Stefanazzi, Leandro Tiffenberg, Javier Treptou, Ken Uemura, Sho Wilcer, Neal |
| author_facet | Villalpando, Edgar Marrufo Drlica-Wagner, Alex Roach, Brandon Bonati, Marco Bakshi, Abhishek Campa, Julia Cancelo, Gustavo Cancino, Braulio Chavez, Claudio R. Chierchie, Fernando Estrada, Juan Moroni, Guillermo Fernandez Fraga, Luciano Gaido, Manuel E. Holland, Stephen E. Hur, Rachel Jonas, Michelle Moore, Peter Paolini, Eduardo Malagón, Andrés A. Plazas Stefanazzi, Leandro Tiffenberg, Javier Treptou, Ken Uemura, Sho Wilcer, Neal |
| contents | We present the first on-sky results from an ultra-low-readout-noise Skipper CCD focal plane prototype for the SOAR Integral Field Spectrograph (SIFS). The Skipper CCD focal plane consists of four 6k x 1k, 15 $μ$m pixel, fully-depleted, p-channel devices that have been thinned to ~250 $μ$m, backside processed, and treated with an anti-reflective coating. These Skipper CCDs were configured for astronomical spectroscopy, i.e., single-sample readout noise < 4.3 e- rms/pixel, the ability to achieve multi-sample readout noise $\ll$ 1 e- rms/pixel, full-well capacities ~40,000-65,000 e-, low dark current and charge transfer inefficiency (~2 x 10$^{-4}$ e-/pixel/s and 3.44 x 10$^{-7}$, respectively), and an absolute quantum efficiency of $\gtrsim$ 80% between 450 nm and 980 nm ($\gtrsim$ 90% between 600 nm and 900 nm). We optimized the readout sequence timing to achieve sub-electron noise (~0.5 e- rms/pixel) in a region of 2k x 4k pixels and photon-counting noise (~0.22 e- rms/pixel) in a region of 220 x 4k pixels, each with a readout time of $\lesssim$ 17 min. We observed two quasars (HB89 1159+123 and QSO J1621-0042) at redshift z ~ 3.5, two high-redshift galaxy clusters (CL J1001+0220 and SPT-CL J2040-4451), an emission line galaxy at z = 0.3239, a candidate member star of the Boötes II ultra-faint dwarf galaxy, and five CALSPEC spectrophotometric standard stars (HD074000, HD60753, HD106252, HD101452, HD200654). We present charge-quantized, photon-counting observations of the quasar HB89 1159+123 and show the detector sensitivity increase for faint spectral features. We demonstrate signal-to-noise performance improvements for SIFS observations in the low-background, readout-noise-dominated regime. We outline scientific studies that will leverage the SIFS-Skipper CCD data and new detector architectures that utilize the Skipper floating gate amplifier with faster readout times. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_10756 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Astronomical Spectroscopy with Skipper CCDs: First Results from a Skipper CCD Focal Plane Prototype at SIFS Villalpando, Edgar Marrufo Drlica-Wagner, Alex Roach, Brandon Bonati, Marco Bakshi, Abhishek Campa, Julia Cancelo, Gustavo Cancino, Braulio Chavez, Claudio R. Chierchie, Fernando Estrada, Juan Moroni, Guillermo Fernandez Fraga, Luciano Gaido, Manuel E. Holland, Stephen E. Hur, Rachel Jonas, Michelle Moore, Peter Paolini, Eduardo Malagón, Andrés A. Plazas Stefanazzi, Leandro Tiffenberg, Javier Treptou, Ken Uemura, Sho Wilcer, Neal Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Instrumentation and Detectors We present the first on-sky results from an ultra-low-readout-noise Skipper CCD focal plane prototype for the SOAR Integral Field Spectrograph (SIFS). The Skipper CCD focal plane consists of four 6k x 1k, 15 $μ$m pixel, fully-depleted, p-channel devices that have been thinned to ~250 $μ$m, backside processed, and treated with an anti-reflective coating. These Skipper CCDs were configured for astronomical spectroscopy, i.e., single-sample readout noise < 4.3 e- rms/pixel, the ability to achieve multi-sample readout noise $\ll$ 1 e- rms/pixel, full-well capacities ~40,000-65,000 e-, low dark current and charge transfer inefficiency (~2 x 10$^{-4}$ e-/pixel/s and 3.44 x 10$^{-7}$, respectively), and an absolute quantum efficiency of $\gtrsim$ 80% between 450 nm and 980 nm ($\gtrsim$ 90% between 600 nm and 900 nm). We optimized the readout sequence timing to achieve sub-electron noise (~0.5 e- rms/pixel) in a region of 2k x 4k pixels and photon-counting noise (~0.22 e- rms/pixel) in a region of 220 x 4k pixels, each with a readout time of $\lesssim$ 17 min. We observed two quasars (HB89 1159+123 and QSO J1621-0042) at redshift z ~ 3.5, two high-redshift galaxy clusters (CL J1001+0220 and SPT-CL J2040-4451), an emission line galaxy at z = 0.3239, a candidate member star of the Boötes II ultra-faint dwarf galaxy, and five CALSPEC spectrophotometric standard stars (HD074000, HD60753, HD106252, HD101452, HD200654). We present charge-quantized, photon-counting observations of the quasar HB89 1159+123 and show the detector sensitivity increase for faint spectral features. We demonstrate signal-to-noise performance improvements for SIFS observations in the low-background, readout-noise-dominated regime. We outline scientific studies that will leverage the SIFS-Skipper CCD data and new detector architectures that utilize the Skipper floating gate amplifier with faster readout times. |
| title | Astronomical Spectroscopy with Skipper CCDs: First Results from a Skipper CCD Focal Plane Prototype at SIFS |
| topic | Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2406.10756 |