Formation of Lunar Basins from Impacts of Leftover Planetesimals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10455240" target="_blank" >RIV/00216208:11320/22:10455240 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZDRLse8uki" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ZDRLse8uki</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/2041-8213/aca40e" target="_blank" >10.3847/2041-8213/aca40e</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Formation of Lunar Basins from Impacts of Leftover Planetesimals

Popis výsledku v původním jazyce

The Moon holds important clues to the early evolution of the solar system. Some 50 impact basins (crater diameter D &gt; 300 km) have been recognized on the lunar surface, implying that the early impact flux was much higher than it is now. The basin-forming impactors were suspected to be asteroids released from an inner extension of the main belt (1.8-2.0 au). Here we show that most impactors were instead rocky planetesimals left behind at similar to 0.5-1.5 au after the terrestrial planet accretion. The number of basins expected from impacts of leftover planetesimals largely exceeds the number of known lunar basins, suggesting that the first similar to 200 Myr of impacts are not recorded on the lunar surface. The Imbrium basin formation (age similar or equal to 3.92 Gyr; impactor diameter d greater than or similar to 100 km) occurs with a 15%-35% probability in our model. Imbrium must have formed unusually late to have only two smaller basins (Orientale and Schrodinger) forming afterwards. The model predicts similar or equal to 20 d &gt; 10 km impacts on the Earth 2.5-3.5 Gyr ago (Ga), which is comparable to the number of known spherule beds in the late Archean.

Název v anglickém jazyce

Formation of Lunar Basins from Impacts of Leftover Planetesimals

Popis výsledku anglicky

The Moon holds important clues to the early evolution of the solar system. Some 50 impact basins (crater diameter D &gt; 300 km) have been recognized on the lunar surface, implying that the early impact flux was much higher than it is now. The basin-forming impactors were suspected to be asteroids released from an inner extension of the main belt (1.8-2.0 au). Here we show that most impactors were instead rocky planetesimals left behind at similar to 0.5-1.5 au after the terrestrial planet accretion. The number of basins expected from impacts of leftover planetesimals largely exceeds the number of known lunar basins, suggesting that the first similar to 200 Myr of impacts are not recorded on the lunar surface. The Imbrium basin formation (age similar or equal to 3.92 Gyr; impactor diameter d greater than or similar to 100 km) occurs with a 15%-35% probability in our model. Imbrium must have formed unusually late to have only two smaller basins (Orientale and Schrodinger) forming afterwards. The model predicts similar or equal to 20 d &gt; 10 km impacts on the Earth 2.5-3.5 Gyr ago (Ga), which is comparable to the number of known spherule beds in the late Archean.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA21-11058S" target="_blank" >GA21-11058S: Raný orbitální a chemický vývoj planetárních soustav</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal Letters

ISSN

2041-8205

e-ISSN

2041-8213

Svazek periodika

941

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

L9

Kód UT WoS článku

000894094100001

EID výsledku v databázi Scopus

2-s2.0-85143702593