The ASAS-SN Bright Supernova Catalog – II. 2015

Abstract

This manuscript presents information for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) during 2015, its second full year of operations. The same information is presented for bright (m V ≤ 17), spectroscopically confirmed supernovae discovered by other sources in 2015. As with the first ASAS-SN bright supernova catalogue, we also present redshifts and near-ultraviolet through infrared magnitudes for all supernova host galaxies in both samples. Combined with our previous catalogue, this work comprises a complete catalogue of 455 supernovae from multiple professional and amateur sources, allowing for population studies that were previously impossible. This is the second of a series of yearly papers on bright supernovae and their hosts from the ASAS-SN team.

The Zwicky Transient Facility Bright Transient Survey. I. Spectroscopic Classification and the Redshift Completeness of Local Galaxy Catalogs

“…The fraction of discoveries belonging to each of these classes is in agreement with the results from Li et al (2011) for a magnitude-limited survey, as shown in Figure 3. 38 Figure 3 also shows the relative rate of SNe found by ASAS-SN (Holoien et al 2017a(Holoien et al , 2017b(Holoien et al , 2017c(Holoien et al , 2019, which, like the ZTF BTS and unlike LOSS, does not target specific galaxies when searching for transients. 39 Both ZTF and ASAS-SN find a higher fraction of SNe II than LOSS, although these estimates all agree to within the uncertainties.…”

Optically targeted search for gravitational waves emitted by core-collapse supernovae during the first and second observing runs of advanced LIGO and advanced Virgo

“…During O1 and O2, astronomers found and followed-up numerous CCSNe in the nearby universe. Based on the information from Astronomical Telegrams [36] and supernova catalogs (ASAS-SN [37][38][39][40], DLT40 [41], Gaia [42,43], ASRAS [44], TNS [45], OSC [46], CBAT [47]), we found 9 supernovae of interest.…”

Astronomical Distance Determination in the Space Age

“…SNe Ia are intrinsically luminous (Riess et al, 2016), thus, even with modest aperture telescopes SNe Ia can be discovered over large volumes; indeed, the All Sky Survey for Supernova (ASAS-SN; Shappee et al, 2014a) uses telescopes with only a 14 cm aperture to discover a total of 242 confirmed SNe, of which 183 were SN Ia (76%) over its first 18 months of dual-hemisphere operations (01 May 2014 to 31 December 2015) alone within m V < 17 (Holoien et al, 2017a) 1 . Their intrinsic luminosity also permits their discovery at significant redshift; the previous most distant SN Ia SN UDS10Wil at z=1.914, which was discovered in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS, PI: Faber & Ferguson; see Jones et al, 2013, for details), was recently replaced with another 15 in the range from 1.9< z <2.3 presented in Riess et al (2017).…”

“…From inspection of Figure 4b, the number of SNe Ia discovered per annum fluctuates widely, but, in general, the numbers do not trend strongly with the onset of all-sky monitoring programs (albeit these programs permit unprecedented early detection; e.g., Figure 2). Analyses of yearly rates over the next few years, however, will be more informative with programs like ASAS-SN having become dramatically more efficient (e.g., Holoien et al, 2017b).…”

“…These effects are complicated and may bias attempts to better understand which galaxies produce SN Ia. More complex modeling as in Holoien et al (2017c) could be of use to disentangle these effects in the general SN Ia population as well as the continued large-scale study of detailed SN Ia host demographics (e.g., Holoien et al, 2017b, and references therein).…”