lchondrites :: The Massalia asteroid family as the origin of ordinary L chondrites

Here we present materials from the paper The Massalia asteroid family as the origin of ordinary L chondrites by Marsset, Vernazza, Brož et al.

See the submitted paper, published paper, as well as accompanying paper by Brož et al.! For those in a hurry, we have an 8-minute research summary that was presented at the DPS 2024 meeting.

Major results and implications ↓

L chondrites are from the Massalia2 family. Spectral classification (S) is compatible. Composition (L) is compatible. Albedo is correct. SFD is steep down-to the observational limit. Corresponding dust band is at 1.4° (Nesvorný et al. 2003). Pre-atmospheric meteorite orbits are close to this source. First family formed 470 My ago. Most of material was reaccumuated. Second family formed 40 My ago. Old shocked material was ejected.1 The two families 'overlap' (similarly as Vesta). CRE ages are compatible. Extraterrestrial He-3 is likely compatible (late Eocene; Farley et al. 2006). Cf. L-like NEOs are from Juno.

¹i.e., the only solution to the old problem!

Supplementary animations →

An 8-minute research summary.	Extended Data Fig. 3 Synthetic size-frequency distribution of the Massalia family.	Extended Data Fig. 3 Synthetic size-frequency distribution of the second Massalia family.	Convex-hull shape model of (20) Massalia from DAMIT.

Supplementary files ↓

boulder/	Collisional models
nbody_synthetic2/	Orbital models
boulder_20230521_LOGINTERP.tar.gz	Boulder code, Monte-Carlo collisions (Morbidelli et al. 2009)
makein_dir.tar.gz	Initial conditions
swift.tar.gz	SWIFT integrator (Levison & Duncan 1994)
swift_bs_f_omega.tar.gz	ditto, for initial conditions
swift_rmvs3_fp_ye_yorp_20220227_GIT.tar.gz	ditto, for forward integrations
yarko_dadt.tar.gz	Yarkovsky drift