The stellar origins of 96Zr excesses in presolar graphites from the Murchison meteorite

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Volume 708 (April 2026)

A&A, 708 (2026) A42

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Table 1.

Light and heavy isotopic data of subgrains, with grain average (in brackets), for four KFC1 graphites from Murchison with ⁹⁶Zr excesses.

Isotopic ratios	KFC1h-343	KFC1h-524	KFC1h-614	KFC1h-721
¹²C/¹³C	(167.7 ± 3.1)	(12.9 ± 0.2)	(93.3 ± 1.6)	(662.5 ± 14.5)
¹⁴N/¹⁵N	(300 ± 17)	(255 ± 11)	(280 ± 11)	(273 ± 18)
$δ^{17} O_{16}$ $Mathematical equation: $ \delta^{17}\mathrm{O}_{16} $$ (‰)	(34 ± 5)	(7 ± 22)	(30 ± 8)	(34 ± 16)
$δ^{18} O_{16}$ $Mathematical equation: $ \delta^{18}\mathrm{O}_{16} $$ (‰)	(66 ± 6)	(119 ± 8)	(47 ± 6)	(58 ± 8)

$δ^{90} {Zr}_{94}$ $Mathematical equation: $ \delta^{90}{\mathrm{Zr}}_{94} $$ (‰)	−123 ± 57	−180 ± 59	−118 ± 131	−456 ± 113
	(−111 ± 58)	(−53 ± 24)	(−75 ± 109)	(−550 ± 37)
$δ^{91} {Zr}_{94}$ $Mathematical equation: $ \delta^{91}{\mathrm{Zr}}_{94} $$ (‰)	−160 ± 79	−183 ± 86	−497 ± 139	−645 ± 210
	(−142 ± 72)	(−91 ± 33)	(−195 ± 96)	(−489 ± 89)
$δ^{92} {Zr}_{94}$ $Mathematical equation: $ \delta^{92}{\mathrm{Zr}}_{94} $$ (‰)	−121 ± 72	−19 ± 86	−253 ± 152	−800 ± 154
	(−103 ± 74)	(−57 ± 29)	(−103 ± 135)	(−775 ± 59)
$δ^{96} {Zr}_{94}$ $Mathematical equation: $ \delta^{96}{\mathrm{Zr}}_{94} $$ (‰)	1069 ± 255	1831 ± 328	1103 ± 547	3695 ± 1488
	(1068 ± 530)	(361 ± 86)	(1100 ± 536)	(2185 ± 540)

$δ^{92} {Mo}_{96}$ $Mathematical equation: $ \delta^{92}{\mathrm{Mo}}_{96} $$ (‰)	−217 ± 60	−4 ± 12	140 ± 48	312 ± 124
	(−66 ± 16)	(−62 ± 58)	(48 ± 35)	(119 ± 31)
$δ^{94} {Mo}_{96}$ $Mathematical equation: $ \delta^{94}{\mathrm{Mo}}_{96} $$ (‰)	−37 ± 80	12 ± 14	127 ± 54	243 ± 138
	(−55 ± 19)	(−63 ± 67)	(42 ± 41)	(−56 ± 35)
$δ^{95} {Mo}_{96}$ $Mathematical equation: $ \delta^{95}{\mathrm{Mo}}_{96} $$ (‰)	−109 ± 64	71 ± 13	18 ± 43	84 ± 107
	(−57 ± 16)	(43 ± 62)	(27 ± 34)	(−47 ± 27)
$δ^{97} {Mo}_{96}$ $Mathematical equation: $ \delta^{97}{\mathrm{Mo}}_{96} $$ (‰)	−55 ± 78	−10 ± 14	31 ± 50	−172 ± 107
	(−49 ± 19)	(−77 ± 65)	(18 ± 40)	(−64 ± 32)
$δ^{98} {Mo}_{96}$ $Mathematical equation: $ \delta^{98}{\mathrm{Mo}}_{96} $$ (‰)	−51 ± 61	23 ± 11	−75 ± 36	51 ± 93
	(−34 ± 15)	(9 ± 55)	(−15 ± 30)	(−45 ± 24)
$δ^{100} {Mo}_{96}$ $Mathematical equation: $ \delta^{100}{\mathrm{Mo}}_{96} $$ (‰)	−217 ± 69	9 ± 14	−37 ± 48	78 ± 122
	(−87 ± 18)	(−1 ± 69)	(4 ± 40)	(−9 ± 32)

Plausible stellar sources	Intermediate mass-AGB stars,	RAWDs	CCSNe	CCSNe
	with subsolar metallicities
Grain averages in parentheses. All errors are 1σ

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