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Supernova Discoveries 2010-2011: Statistics and Trends

Gal-Yam, A and Mazzali, PA and Manulis, I and Bishop, D (2013) Supernova Discoveries 2010-2011: Statistics and Trends. Publications of the Astronomical Society of the Pacific, 125 (929). pp. 749-752. ISSN 1538-3873

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Abstract

We have inspected all supernova discoveries reported during 2010 and 2011 (538 and 926 events, respectively). We examine the statistics of all discovered objects, as well as those of the subset of spectroscopically-confirmed events. In these two years we see the rise of wide-field non-targeted supernova surveys to prominence, with the largest numbers of events reported by the CRTS and PTF surveys (572 and 393 events in total respectively, contributing together 74% of all reported discoveries in 2011), followed by the integrated contribution of numerous amateurs (184 events). Among spectroscopically-confirmed events the PTF (393 events) leads, followed by CRTS (170 events), and amateur discoveries (144 events). Traditional galaxy-targeted surveys, such as LOSS and CHASE, maintain a strong contribution (86 and 61 events, respectively) with high spectroscopic completeness (~90% per cent). It is interesting to note that the community managed to provide substantial spectroscopic follow-up for relatively brighter amateur discoveries (<m>=16.5 mag), but significant less help for fainter (and much more numerous) events promptly released by the CRTS (<m>=18.6 mag). Inspecting discovery magnitude and redshift distributions we find that PS1 discoveries have similar properties (<m>=21.6 mag, <z>=0.23) to events found in previous seasons by cosmology-oriented projects (e.g., SDSS-II), while PTF (<m>=19.2 mag, <z>=0.095) and CRTS (<m>=18.6 mag, <z>=0.049) populate the relatively unexplored phase space of faint SNe (>19 mag) in nearby galaxies (mainly PTF), and events at 0.05<z<0.2 (CRTS and PTF). Examining the specific question of reporting channels over the previous dozen years, we find that traditional reports via CBET telegrams now account only for a minority of SN discoveries.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Astronomical Society of the Pacfic
Related URLs:
Date Deposited: 08 Feb 2016 10:51
Last Modified: 08 Feb 2016 10:51
DOI or Identification number: 10.1086/671483
URI: http://researchonline.ljmu.ac.uk/id/eprint/2855

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