Supernova discoveries 2010: statistics and trends

Details Supernova discoveries 2010: statistics and trends Supernova discoveries 2010: statistics and trends

2011-03-26

arxiv.org/abs/1103.5165v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

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Scientific paper

We have inspected all supernova discoveries reported during 2010, a total of 538 events. This number includes a small number of "supernova impostors" (bright extragalactic eruptions) but not novae or events that turned out to be Galactic stars. We examine the statistics of all discovered objects, as well as those of the subset of spectroscopically-confirmed events. This year shows the rise of wide-field non-targeted supernova surveys to prominence, with the largest numbers of events contributed by the CRTS and PTF surveys (189 and 88 events respectively), followed by the integrated contribution of numerous amateurs (82 events). Among spectroscopically-confirmed events the PTF (88 events) leads, before amateur discoveries (69 events), closely followed by the CRTS and PS1 surveys (67 and 63 events, respectively). Traditional galaxy-targeted surveys such as LOSS and CHASE, maintain a strong contribution (50 and 36 events, respectively) with high spectroscopic completeness (96% for LOSS). It is interesting to note that the community managed to provide substantial spectroscopic follow-up for relatively brighter amateur discoveries (=16.7), but did not provide significant help for slightly fainter (and much more numerous) events promptly released by the Catalina survey (=18). Inspecting discovery magnitude and redshift distributions we find that PS1 discoveries have similar properties (=21.7, =0.24) to events found in previous seasons by cosmology-oriented projects (e.g., SDSS-II), while PTF (=19.3, =0.086) and CRTS (=18, =0.06) populate a the relatively unexplored phase space of faint SNe (>19 mag) in nearby galaxies (mainly PTF), and events at 0.05

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