Oxygen fugacity in six ex-planets

With h/t ToughSF: Oxygen fugacities [pdf]. This is by that trick by which we can look at planetary compositions after their star has gone red-giant and cracked them open. We looked at 23 of such pollutants almost a year ago.

The 2019 list incorporated 1) SDSS J1043+0855 [WD 1041+092?]; 2) WD 1536+520; 3) GD 40; 4) SDSS J0738+1835 [alias WD J0738+1835 probably]; 5) WD 1226+110 [=SDSS J122859.93+104032.9]; and 6) WD 1145+017. Of these I cannot find the fifth in the November table and I'm guessing on the first, although each had got some hype elsewhere 2015-16. WD 1145+017 had the Olivine Websterite so was the Earthlike. Wish I could've met you...

Alexandra E. Doyle et al. tell us why we like Olivine Websterite: Oxygen Fugacity. 1) Periclase Clinopyroxenite, 2) Periclase Dunite, 3) Periclase Wehrlite, and 4) Dunite have this; as did whatever made up 5). Note that these three Periclase minerals are alien to us. Still, Doyle's crew noted from the proportion of iron rust in the dwarfs that the planets used to be generally similar to the terrestrial worlds here including Vesta excepting Venus (whose surface rocks are unreachable).

I repeat: these stars skewed A and F in life. The planets were Hadean, caught before their mantles were right. Don't count them out, says Doyle; if the star gives it a chance, so should astrobiologists. It might be that exotic periclase degrades to an Earthlike mineral as the planet cools and maybe even after some chloroplast takes root.