Kavli Affiliate: Gregory J. Herczeg
| First 5 Authors: Steve Mairs, Seonjae Lee, Doug Johnstone, Colton Broughton, Jeong-Eun Lee
| Summary:
The JCMT Transient Survey has been monitoring eight Gould Belt low-mass
star-forming regions since December 2015 and six somewhat more distant
intermediate-mass star-forming regions since February 2020 with SCUBA-2 on the
JCMT at ShortS and LongS and with an approximately monthly cadence. We
introduce our Pipeline v2 relative calibration procedures for image alignment
and flux calibration across epochs, improving on our previous Pipeline v1 by
decreasing measurement uncertainties and providing additional robustness. These
new techniques work at both LongS and ShortNS, where v1 only allowed
investigation of the LongS data. Pipeline v2 achieves better than
$0.5^{primeprime}$ relative image alignment, less than a tenth of the
submillimeter beam widths. The v2 relative flux calibration is found to be 1%
at LongS and $<5$% at ShortNS. The improvement in the calibration is
demonstrated by comparing the two pipelines over the first four years of the
survey and recovering additional robust variables with v2. Using the full six
years of the Gould Belt survey the number of robust variables increases by
50,%, and at ShortS we identify four robust variables, all of which are also
robust at LongNS. The multi-wavelength light curves for these sources are
investigated and found to be consistent with the variability being due to dust
heating within the envelope in response to accretion luminosity changes from
the central source.
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