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ATLAS100 -- I. A volume-limited sample of supernovae and related transients within 100 Mpc

Shubham Srivastav, Stephen J. Smartt, Thomas Moore, Kenneth W. Smith, David R. Young, Michael D. Fulton, Charlotte R. Angus, Matt Nicholl, Heloise F. Stevance, Ting-Wan Chen, Andrea Pastorello, Julian Sommer, Fiorenzo Stoppa, Jack W. Tweddle, Joseph P. Anderson, Mark E. Huber, Armin Rest, Lauren Rhodes, Luke J. Shingles, Aysha Aamer, Alejandro Clocchiatti, Alexander J. Cooper, Nicolas Erasmus, James H. Gillanders, Dylan Magill, Giuliano Pignata, Paige Ramsden, Brian P. Schmidt, Xinyue Sheng, Joshua G. Weston, Larry Denneau, John L. Tonry

Abstract

We present ATLAS100 -- a sample of 1729 supernovae and other explosive optical transients within $\sim 100$ Mpc observed by the ATLAS survey over a span of 5.75 years from 2017 September 21 to 2023 June 21. The volume-limited sample includes transients associated with galaxies with a spectroscopic redshift of $z \leq 0.025$, and spectroscopically classified transients within this redshift threshold where a host redshift was not available in existing catalogues. Our host galaxy list is constructed from aggregating all available galaxy redshift and distance catalogues. We carefully select all transients within a projected radius of 50\,kpc of these hosts. The ATLAS100 transient sample has a host galaxy redshift completeness fraction of $83$ per cent, consistent with expectations for the redshift completeness of local galaxy catalogues. Within this volume, the spectroscopic classifications are 87 per cent complete and we reclassify many ambiguous transients with joint light curve and spectroscopic considerations. Here, we release the catalogue together with compiled, binned and cleaned ATLAS photometry for all transients. We fit the light curve data to derive peak luminosity and characteristic timescales. We explore the sample characteristics, demographics and discuss completeness and purity of the sample.

ATLAS100 -- I. A volume-limited sample of supernovae and related transients within 100 Mpc

Abstract

We present ATLAS100 -- a sample of 1729 supernovae and other explosive optical transients within Mpc observed by the ATLAS survey over a span of 5.75 years from 2017 September 21 to 2023 June 21. The volume-limited sample includes transients associated with galaxies with a spectroscopic redshift of , and spectroscopically classified transients within this redshift threshold where a host redshift was not available in existing catalogues. Our host galaxy list is constructed from aggregating all available galaxy redshift and distance catalogues. We carefully select all transients within a projected radius of 50\,kpc of these hosts. The ATLAS100 transient sample has a host galaxy redshift completeness fraction of per cent, consistent with expectations for the redshift completeness of local galaxy catalogues. Within this volume, the spectroscopic classifications are 87 per cent complete and we reclassify many ambiguous transients with joint light curve and spectroscopic considerations. Here, we release the catalogue together with compiled, binned and cleaned ATLAS photometry for all transients. We fit the light curve data to derive peak luminosity and characteristic timescales. We explore the sample characteristics, demographics and discuss completeness and purity of the sample.
Paper Structure (28 sections, 1 equation, 14 figures, 2 tables)

This paper contains 28 sections, 1 equation, 14 figures, 2 tables.

Table of Contents

  1. Introduction
  2. ATLAS100 sample definition
  3. ATLAS survey
  4. Sample definition
  5. Sample vetting and rejection of contaminants
  6. Spectral reclassification
  7. Light curve binning
  8. Results and Discussion
  9. Sample statistics and demographics
  10. Redshifts and discovery magnitudes
  11. SN types and subtypes
  12. Host galaxy separation
  13. Light curve fitting
  14. SESNe
  15. SNe Ia
  16. ...and 13 more sections

Figures (14)

  • Figure 1: The $o$-band magnitude versus distance for transients with absolute magnitudes $M_{o}=-14$ and $M_{o}=-15.9$. The solid orange regions project the sensitivity of $m_o=19.0\pm0.5$ to the distance to which a source would be detected.
  • Figure 2: Histogram showing the number of matches to different source catalogues mined by sherlock for the host galaxies of 1729 transients in ATLAS100 sherlock.
  • Figure 3: Sky distribution of the ATLAS100 transient sample. Also shown (green circles) is the distribution of local galaxies within 100 Mpc from the Local AGN Survey 2020MNRAS.494.1784A.
  • Figure 4: Upper panel: distribution of TNS discovery magnitude versus redshift for all transients in ATLAS100. The ATLAS discoveries (689 of the total 1729) are shown in either orange or cyan, depending on whether the discovery filter was $o$-band or $c$-band. Non-ATLAS discoveries are shown as black circles. The histograms for redshift and discovery magnitude are for the full sample, with bin widths of $\Delta z = 0.00167$ (corresponding to $\sim 7\,$Mpc) and $\Delta\mathrm{mag} = 0.5$. Lower panel: distribution of peak observed ATLAS magnitude (without extinction correction) versus redshift, and the associated histograms for the key spectral types in the sample.
  • Figure 5: Upper panel: histogram of first ATLAS $5\sigma$ detection for the classified (blue) and unclassified (red) sub-samples. The full sample is shown in grey, and the y-axis is normalized to the total number of counts for a direct comparison. Lower panel: ATLAS peak magnitude for the classified and unclassified sub-samples. The bin width is 0.5 mag.
  • ...and 9 more figures