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Titolo: | PESSTO: survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects | Autori: | Smartt, S. J. Valenti, S. Fraser, M. Inserra, C. Young, D. R. Sullivan, M. PASTORELLO, Andrea BENETTI, Stefano Gal-Yam, A. KNAPIC, Cristina MOLINARO, Marco Walton, N. A. Wyrzykowski, L. Yuan, F. ZAMPIERI, Luca SMAREGLIA, Riccardo Smith, K. W. Taubenberger, S. Yaron, O. Anderson, J. P. Ashall, C. Balland, C. Baltay, C. Barbarino, C. Bauer, F. E. Baumont, S. Bersier, D. Blagorodnova, N. Bongard, S. BOTTICELLA, MARIA TERESA BUFANO, FILOMENA Bulla, M. CAPPELLARO, Enrico Campbell, H. Cellier-Holzem, F. Chen, T. -W. Childress, M. J. Clocchiatti, A. Contreras, C. DALL'ORA, Massimo Danziger, J. de Jaeger, T. De Cia, A. DELLA VALLE, Massimo Dennefeld, M. ELIAS DE LA ROSA, NANCY DEL CARMEN Elman, N. Feindt, U. Fleury, M. Gall, E. Gonzalez-Gaitan, S. Galbany, L. Morales Garoffolo, A. GREGGIO, Laura Guillou, L. L. Hachinger, S. Hadjiyska, E. Hage, P. E. Hillebrandt, W. Hodgkin, S. Hsiao, E. Y. James, P. A. Jerkstrand, A. Kangas, T. Kankare, E. Kotak, R. Kromer, M. Kuncarayakti, H. Leloudas, G. Lundqvist, P. Lyman, J. D. Hook, I. M. Maguire, K. Manulis, I. Margheim, S. J. Mattila, S. Maund, J. R. Mazzali, P. A. McCrum, M. McKinnon, R. Moreno-Raya, M. E. Nicholl, M. Nugent, P. Pain, R. Pignata, G. Phillips, M. M. Polshaw, J. Pumo, M. L. Rabinowitz, D. Reilly, E. Romero-Cañizales, C. Scalzo, R. Schmidt, B. Schulze, S. Sim, S. Sollerman, J. Taddia, F. Tartaglia, L. Terreran, G. TOMASELLA, Lina TURATTO, Massimo Walker, E. |
Data pubblicazione: | 2015 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 579 | Da pagina:: | A40 | Abstract: | Context. The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. PESSTO classifies transients from publicly available sources and wide-field surveys, and selects science targets for detailed spectroscopic and photometric follow-up. PESSTO runs for nine months of the year, January - April and August - December inclusive, and typically has allocations of 10 nights per month. Aims: We describe the data reduction strategy and data products that are publicly available through the ESO archive as the Spectroscopic Survey data release 1 (SSDR1). Methods: PESSTO uses the New Technology Telescope with the instruments EFOSC2 and SOFI to provide optical and NIR spectroscopy and imaging. We target supernovae and optical transients brighter than 20.5<SUP>m</SUP> for classification. Science targets are selected for follow-up based on the PESSTO science goal of extending knowledge of the extremes of the supernova population. We use standard EFOSC2 set-ups providing spectra with resolutions of 13-18 Å between 3345-9995 Å. A subset of the brighter science targets are selected for SOFI spectroscopy with the blue and red grisms (0.935-2.53 μm and resolutions 23-33 Å) and imaging with broadband JHK<SUB>s</SUB> filters. Results: This first data release (SSDR1) contains flux calibrated spectra from the first year (April 2012-2013). A total of 221 confirmed supernovae were classified, and we released calibrated optical spectra and classifications publicly within 24 h of the data being taken (via WISeREP). The data in SSDR1 replace those released spectra. They have more reliable and quantifiable flux calibrations, correction for telluric absorption, and are made available in standard ESO Phase 3 formats. We estimate the absolute accuracy of the flux calibrations for EFOSC2 across the whole survey in SSDR1 to be typically ~15%, although a number of spectra will have less reliable absolute flux calibration because of weather and slit losses. Acquisition images for each spectrum are available which, in principle, can allow the user to refine the absolute flux calibration. The standard NIR reduction process does not produce high accuracy absolute spectrophotometry but synthetic photometry with accompanying JHK<SUB>s</SUB> imaging can improve this. Whenever possible, reduced SOFI images are provided to allow this. Conclusions: Future data releases will focus on improving the automated flux calibration of the data products. The rapid turnaround between discovery and classification and access to reliable pipeline processed data products has allowed early science papers in the first few months of the survey. <P />Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, as part of programme 188.D-3003 (PESSTO). "http://www.pessto.org" | Acknowledgments: | This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile as part of PESSTO, (the Public ESO Spectroscopic Survey for Transient Objects Survey) ESO programme 188.D-3003, 191.D-0935. Research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement No. [291222] (PI : S. J. Smartt) and STFC grants ST/I001123/1 and ST/L000709/1. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. M.J.C. acknowledges funding from the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020 MS acknowledges support from the Royal Society and EU/FP7-ERC grant No. [615929]. MF acknowledges support by the European Union FP7 programme through ERC grant number 320360. S.B., E.C., A.P., L.T. and M.T. are partially supported by the PRIN-INAF 2011 with the project Transient Universe: from ESO Large to PESSTO. We acknowledge CONICYT-Chile grants, Basal-CATA PFB-06/2007 (FEB), FONDECYT 1141218 (FEB) and 3140534 (SS), PCCI 130074 (FEB, SS), ALMA-CONICYT 31100004 (FEB, CRC), “EMBIGGEN” Anillo ACT1101 (FEB), Project IC120009 “Millennium Institute of Astrophysics (MAS) of the Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo (FEB, SS, CRC). A.G.-Y. is supported by the EU/FP7-ERC grant No. [307260], The Quantum Universe’ I-Core programme by the Israeli Committee for planning and budgeting and the ISF, the Weizmann-UK making connections programme, and the Kimmel award. NER acknowledges support from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement No. 267251 “Astronomy Fellowships in Italy” (AstroFIt). Support for LG, SG and HK is provided by the Ministry of Economy, Development, and Tourisms Millennium Science Initiative through grant IC12009, awarded to The Millennium Institute of Astrophysics, MAS. L.G., S.G. and H.K. acknowledge support by CONICYT through FONDECYT grants 3130680 and 3140563, 3140566 | URI: | http://hdl.handle.net/20.500.12386/23890 | URL: | http://arxiv.org/abs/1411.0299v2 | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201425237 | Bibcode ADS: | 2015A&A...579A..40S | Fulltext: | open |
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