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Fully automated integral field spectrograph pipeline for the SEDMachine: pysedm

Rigault, M. and Neill, J. D. and Blagorodnova, N. and Dugas, A. and Feeney, M. and Walters, R. and Brinnel, V. and Copin, Y. and Fremling, C. and Nordin, J. and Sollerman, J. (2019) Fully automated integral field spectrograph pipeline for the SEDMachine: pysedm. Astronomy and Astrophysics, 627 . Art. No. A115. ISSN 0004-6361. doi:10.1051/0004-6361/201935344.

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Current time domain facilities are discovering hundreds of new galactic and extra-galactic transients every week. Classifying the ever-increasing number of transients is challenging, yet crucial to furthering our understanding of their nature, discovering new classes, and ensuring sample purity, for instance, for Supernova Ia cosmology. The Zwicky Transient Facility is one example of such a survey. In addition, it has a dedicated very-low resolution spectrograph, the SEDMachine, operating on the Palomar 60-inch telescope. This spectrograph’s primary aim is object classification. In practice most, if not all, transients of interest brighter than ∼19 mag are typed. This corresponds to approximately 10–15 targets a night. In this paper, we present a fully automated pipeline for the SEDMachine. This pipeline has been designed to be fast, robust, stable and extremely flexible. PYSEDM enables the fully automated spectral extraction of a targeted point source object in less than five minutes after the end of the exposure. The spectral color calibration is accurate at the few percent level. In the 19 weeks since PYSEDM entered production in early August of 2018, we have classified, among other objects, about 400 Type Ia supernovae and 140 Type II supernovae. We conclude that low resolution, fully automated spectrographs such as the “SEDMachine with pysedm” installed on 2-m class telescopes within the southern hemisphere could allow us to automatically and simultaneously type and obtain a redshift for most (if not all) bright transients detected by LSST within z <  0.2, notably potentially all Type Ia Supernovae. In comparison with the current SEDM design, this would require higher spectral resolution (R ≳ 1000) and slightly improved throughput. With this perspective in mind, pysedm is designed to easily be adaptable to any IFU-like spectrograph.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rigault, M.0000-0002-8121-2560
Neill, J. D.0000-0002-0466-1119
Blagorodnova, N.0000-0003-0901-1606
Walters, R.0000-0002-1835-6078
Copin, Y.0000-0002-5317-7518
Fremling, C.0000-0002-4223-103X
Sollerman, J.0000-0003-1546-6615
Additional Information:© M. Rigault et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Received 22 February 2019 / Accepted 23 April 2019. We thank D. O. Cook, K. De, K. B. Burdge and A. Y. Ho for generously sharing their spectra for the “SEDM and other spectrograph” figure. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement n°759194 – USNAC). The SED Machine is based upon work supported by the National Science Foundation under Grant No. 1106171. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW.
Group:Zwicky Transient Facility
Funding AgencyGrant Number
European Research Council (ERC)759194
ZTF partner institutionsUNSPECIFIED
Subject Keywords:instrumentation: spectrographs / methods: observational / techniques: spectroscopic / surveys / methods: data analysis
Record Number:CaltechAUTHORS:20190725-125944517
Persistent URL:
Official Citation:Fully automated integral field spectrograph pipeline for the SEDMachine: pysedm M. Rigault, J. D. Neill, N. Blagorodnova, A. Dugas, M. Feeney, R. Walters, V. Brinnel, Y. Copin, C. Fremling, J. Nordin and J. Sollerman A&A, 627 (2019) A115 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97416
Deposited By: George Porter
Deposited On:25 Jul 2019 21:24
Last Modified:16 Nov 2021 17:31

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