TY - JOUR
T1 - The Asteroid 162173 Ryugu
T2 - A Cometary Origin
AU - Miura, Hitoshi
AU - Nakamura, Eizo
AU - Kunihiro, Tak
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society..
PY - 2022/2/1
Y1 - 2022/2/1
N2 - The Japanese Hayabusa2 mission has revealed in detail the physical characteristics of the C-type asteroid 162173 Ryugu, in particular, its spinning top-shaped rubble-pile structure and potentially high organic content. A widely accepted formation scenario for Ryugu is catastrophic collision between larger asteroids and the subsequent slow gravitational accumulation of collisional debris. An alternative scenario is that Ryugu is an extinct comet that lost its icy components. Here, we numerically simulated the sublimation of water ice from a porous cometary nucleus until the refractory components, such as silicate rocks and organic matter, were left behind as evaporative residues. Such a process represents the transformation from a comet to an asteroid. The spin-up related to the shrinking nucleus, associated with water ice sublimation, was also calculated. The result of the calculation indicates that the cometary origin scenario can account for all the features of Ryugu discussed above. We conclude that organic-rich spinning top-shaped rubble-pile asteroids, such as Ryugu, are comet-asteroid transition objects or extinct comets.
AB - The Japanese Hayabusa2 mission has revealed in detail the physical characteristics of the C-type asteroid 162173 Ryugu, in particular, its spinning top-shaped rubble-pile structure and potentially high organic content. A widely accepted formation scenario for Ryugu is catastrophic collision between larger asteroids and the subsequent slow gravitational accumulation of collisional debris. An alternative scenario is that Ryugu is an extinct comet that lost its icy components. Here, we numerically simulated the sublimation of water ice from a porous cometary nucleus until the refractory components, such as silicate rocks and organic matter, were left behind as evaporative residues. Such a process represents the transformation from a comet to an asteroid. The spin-up related to the shrinking nucleus, associated with water ice sublimation, was also calculated. The result of the calculation indicates that the cometary origin scenario can account for all the features of Ryugu discussed above. We conclude that organic-rich spinning top-shaped rubble-pile asteroids, such as Ryugu, are comet-asteroid transition objects or extinct comets.
UR - http://www.scopus.com/inward/record.url?scp=85124615090&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85124615090&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ac4bd5
DO - 10.3847/2041-8213/ac4bd5
M3 - Article
AN - SCOPUS:85124615090
SN - 2041-8205
VL - 925
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L15
ER -