DRAFT
2024-07-20 16:49:04
Type: Object/s-Data/Analysis
DAO photometric follow-up of selected optical transients
Authors: D. D. Balam (Dominion Astrophysical Observatory, National Research Council of Canada) and E. Hess (RAO/University of Calgary)
Source Group: DAO_OTS
Abstract:
Here we present photometric follow up observations of selected optical transients using 1.82-m Plaskett telescope of the Dominion Astrophysical Observatory (HAA) National Research Council of Canada.

The transient host galaxy light in our photometric measurement is minimized via one of two methods: Reference images are downloaded from the PanSTARRS image access (Flewelling, H. A., et al.) and are convolved, using the nightly PSF to match our images. The reference is then subtracted from our co-added images. A secondary photometric standard is defined and retained on the subtracted image using a pixel mask. 

A second method involves creating a model galaxy, using the IRAF artdata packages, scaling it to the images and subtracting the host galaxy. The differential photometry  was then performed using Image Reduction and Analysis Facility (IRAF) (Tody, D. 1986, "The IRAF Data Reduction and Analysis System").

Photometric observations obtained with the 1.82-m Plaskett telescope are differential (SDSS g&r filters) and measured from stars in either the Sloan Digital Sky Survey (Skyserver) or the Pan-STARRS release 1 (PS1) Survey - DR1.

The transient host galaxy light in our photometric measurement is minimized via one of two methods: Reference images are downloaded from the PanSTARRS image access (Flewelling, H. A., et al.) and are convolved, using the nightly PSF to match our images. The reference is then subtracted from our co-added images. A secondary photometric standard is defined and retained on the subtracted image using a pixel mask. 

A second method involves creating a model galaxy, using the IRAF artdata packages, scaling it to the images and subtracting the host galaxy. The differential photometry  was then performed using Image Reduction and Analysis Facility (IRAF) (Tody, D. 1986, "The IRAF Data Reduction and Analysis System").

 Secondary standards were used from SDSS DR16 (Ahumada+, 2020) and PS1 Survey DR1 (Chambers+, 2016) to perform differential photometry using Image Reduction and Analysis Facility. 

 

The photometry values of the set of transients are listed in the attached txt file.

Note: the provisional redshifts listed for the host galaxies are photometric redshifts if followed by a 'p'

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