Searching for supernovae in HETDEX Data Release 3. (2023)
Keywords :
SNe ; Active galactic nuclei ; Spectroscopy
Abstract:We have extracted 636 spectra taken at the positions of 583 transient sources from the third data release of the Hobby-Eberly Telescope Dark Energy eXperiment (HETDEX). The transients were discovered by the Zwicky Transient Facility (ZTF) during 2018-2022. The HETDEX spectra provide a potential means to obtain classifications for a large number of objects found by photometric surveys for free. We attempt to explore and classify the spectra by utilizing several template-matching techniques. We have identified two transient sources, ZTF20aatpoos = AT 2020fiz and ZTF19abdkelq, as supernova (SN) candidates. We classify AT 2020fiz as a Type IIP SN observed ~10d after explosion, and we propose ZTF19abdkelq as a likely Type Ia SN
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The Hobby-Eberly Telescope Dark Energy eXperiment (HETDEX; see
Gebhardt+ 2021ApJ...923..217G) uses the Visible Integral-field
Replicable Unit Spectrograph (VIRUS) instrument at the focal surface
of the HET. VIRUS comprises up to 78 IFUs, each with 448 1.5"-diameter
fibers, such that 33152 individual spectra covering 54arcmin^2^ are
obtained with each visit. The spectra extend from 3500 to 5500{AA}
with a resolution of ~2{AA}.
The HETDEX Data Release 2.1 (HDR2.1) continuum-source catalog contains
spectra for ~62k unique objects (Mentuch Cooper+ 2023, see J/ApJ/943/177).
In the HETDEX Data Release 3 (HDR3), the size of the continuum-source
catalog has been extended further, reaching ~230k sources. In this
paper we use the more extensive HDR3 data set.
We aimed to extract spectra at the positions of public ZTF transients
announced between 2017 and early 2022 from the HETDEX spectroscopic
data set. See Section 2.
- J/PASP/110/863 : Stellar Spectral Flux Library
- J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
- J/MNRAS/394/2266 : SN 2005cs one-year photometry (Pastorello+, 2009)
- J/ApJ/895/32 : Zwicky Transient Facility BTS. I. (Fremling+, 2020)
- J/ApJ/920/122 : Candidate Ly{alpha}-emitting galaxies spectra (Davis+, 2021)
- J/ApJ/911/108 : Stars of HETDEX. I. RVs & metal-poor stars (Hawkins+, 2021)
- J/ApJ/916/11 : HETDEX [OIII] emitters. I. Low-z galaxies (Indahl+, 2021)
- J/ApJ/943/177 : HETDEX Public Source Cat. (V3.2) (Mentuch Cooper+, 2023)
