SPITZER-IRS spectral fitting of discs around binary post-AGB stars - Corrigendum

TL;DR

This corrigendum corrects a previous spectral fitting error in analyzing discs around binary post-AGB stars, refining error estimates without affecting core scientific conclusions, and hints at potential new dust parameter trends.

Contribution

It provides corrected error estimates for spectral fitting of post-AGB star discs, ensuring more accurate future analyses and interpretations.

Findings

Corrected errors in spectral fitting routines.

Revised error estimates mostly within previous ranges.

No change to main scientific conclusions.

Abstract

Recently, we have discovered an error in our Monte-Carlo spectral fitting routine, more specifically where the errors on the fluxes were rescaled to get a reduced chi2 of 1. The rescaled errors were too big, resulting in too wide a range of good fits in our 100 step Monte-Carlo routine. This problem affects Figs. 7-9 and Tables A.1, A.2 in Gielen et al. (2008), Table 3 in Gielen et al. (2009a), and Table 4 in Gielen et al. (2009b). We corrected for this error and present the new values and errors in the tables below. The new values and errors nearly all fall within the old error range. Our best chi2 values and overall former scientific results are not affected. With these new errors some possible new trends in the dust parameters might be observed. These will be discussed in an upcoming paper where we extend the sample presented in Gielen et al. (2008) with newly obtained SPITZER-IRS data.