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The data release of the Sloan Digital Sky Survey-II Supernova Survey

The data release of the Sloan Digital Sky Survey-II Supernova Survey
The data release of the Sloan Digital Sky Survey-II Supernova Survey
This paper describes the data release of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves, spectra, classifications, and ancillary data are presented for 10,258 variable and transient sources discovered through repeat ugriz imaging of SDSS Stripe 82, a 300 deg2 area along the celestial equator. This data release is comprised of all transient sources brighter than r ≃ 22.5 mag with no history of variability prior to 2004. Dedicated spectroscopic observations were performed on a subset of 889 transients, as well as spectra for thousands of transient host galaxies using the SDSS-III BOSS spectrographs. Photometric classifications are provided for the candidates with good multi-color light curves that were not observed spectroscopically. From these observations, 4607 transients are either spectroscopically confirmed, or likely to be, supernovae, making this the largest sample of supernova candidates ever compiled. We present a new method for SN host-galaxy identification and derive host-galaxy properties including stellar masses, star-formation rates, and the average stellar population ages from our SDSS multi-band photometry. We derive SALT2 distance moduli for a total of 1443 SN Ia with spectroscopic redshifts as well as photometric redshifts for a further 677 purely-photometric SN Ia candidates. Using the spectroscopically confirmed subset of the three-year SDSS-II SN Ia sample and assuming a flat ΛCDM cosmology, we determine ΩM = 0.315 ± 0.093 (statistical error only) and detect a non-zero cosmological constant at 5.7 σ.
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sako, Masao
c55b2dbb-04bd-4759-8c37-4d640f09c286
Bassett, Bruce
3da02fdb-a749-4ff6-80d5-ee4b3157d120
Becker, Andrew C.
e48000bd-84c1-4dc0-b2a3-cc454bd8fd48
et al.
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sako, Masao
c55b2dbb-04bd-4759-8c37-4d640f09c286
Bassett, Bruce
3da02fdb-a749-4ff6-80d5-ee4b3157d120
Becker, Andrew C.
e48000bd-84c1-4dc0-b2a3-cc454bd8fd48

Smith, Mathew, Sako, Masao, Bassett, Bruce and Becker, Andrew C. , et al. (2018) The data release of the Sloan Digital Sky Survey-II Supernova Survey. Publications of the Astronomical Society of the Pacific, 130 (988). (doi:10.1088/1538-3873/aab4e0).

Record type: Article

Abstract

This paper describes the data release of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves, spectra, classifications, and ancillary data are presented for 10,258 variable and transient sources discovered through repeat ugriz imaging of SDSS Stripe 82, a 300 deg2 area along the celestial equator. This data release is comprised of all transient sources brighter than r ≃ 22.5 mag with no history of variability prior to 2004. Dedicated spectroscopic observations were performed on a subset of 889 transients, as well as spectra for thousands of transient host galaxies using the SDSS-III BOSS spectrographs. Photometric classifications are provided for the candidates with good multi-color light curves that were not observed spectroscopically. From these observations, 4607 transients are either spectroscopically confirmed, or likely to be, supernovae, making this the largest sample of supernova candidates ever compiled. We present a new method for SN host-galaxy identification and derive host-galaxy properties including stellar masses, star-formation rates, and the average stellar population ages from our SDSS multi-band photometry. We derive SALT2 distance moduli for a total of 1443 SN Ia with spectroscopic redshifts as well as photometric redshifts for a further 677 purely-photometric SN Ia candidates. Using the spectroscopically confirmed subset of the three-year SDSS-II SN Ia sample and assuming a flat ΛCDM cosmology, we determine ΩM = 0.315 ± 0.093 (statistical error only) and detect a non-zero cosmological constant at 5.7 σ.

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THE DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY-II SUPERNOVA SURVEY - Accepted Manuscript
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Accepted/In Press date: 6 March 2018
Published date: 14 May 2018
Additional Information: Author Smith has confirmed that Arxiv record is AM

Identifiers

Local EPrints ID: 428638
URI: https://eprints.soton.ac.uk/id/eprint/428638
PURE UUID: 7e1211df-82f1-4e54-a30f-151a0673e0ee
ORCID for Mathew Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 05 Mar 2019 17:30
Last modified: 21 Jun 2019 04:01

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