期刊
ASTROPHYSICAL JOURNAL
卷 746, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/746/1/5
关键词
supernovae: general
资金
- NASA from the Space Telescope Science Institute [HST-GO-12060, HST-GO-12099]
- NASA [NAS 5-26555]
- NSF [AST-0847157]
- Danish National Research Foundation
We report the discovery of a Type Ia supernova (SN Ia) at redshift z = 1.55 with the infrared detector of the Wide Field Camera 3 (WFC3-IR) on the Hubble Space Telescope (HST). This object was discovered in CANDELS imaging data of the Hubble Ultra Deep Field and followed as part of the CANDELS+CLASH Supernova project, comprising the SN search components from those two HST multi-cycle treasury programs. This is the highest redshift SN Ia with direct spectroscopic evidence for classification. It is also the first SN Ia at z > 1 found and followed in the infrared, providing a full light curve in rest-frame optical bands. The classification and redshift are securely defined from a combination of multi-band and multi-epoch photometry of the SN, ground-based spectroscopy of the host galaxy, and WFC3-IR grism spectroscopy of both the SN and host. This object is the first of a projected sample at z > 1.5 that will be discovered by the CANDELS and CLASH programs. The full CANDELS+CLASH SN Ia sample will enable unique tests for evolutionary effects that could arise due to differences in SN Ia progenitor systems as a function of redshift. This high-z sample will also allow measurement of the SN Ia rate out to z approximate to 2, providing a complementary constraint on SN Ia progenitor models.
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