Eccentricity excitation and merging of planetary embryos heated by pebble accretion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10367589" target="_blank" >RIV/00216208:11320/17:10367589 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201731033" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201731033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201731033" target="_blank" >10.1051/0004-6361/201731033</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Eccentricity excitation and merging of planetary embryos heated by pebble accretion

Popis výsledku v původním jazyce

Methods. For the first time, we perform self-consistent global-scale radiative hydrodynamic simulations of a two-fluid protoplanetary disk consisting of gas and pebbles, the latter being accreted by embedded embryos. Accretion heating, along with other radiative processes, is accounted for to correctly model the Type-I migration. Results. We track the evolution of four super-Earth-like embryos, initially located in a region where the disk structure allows for a convergent migration. Generally, embryo merging is facilitated by rapidly increasing embryo masses and breaks the otherwise oligarchic growth. Moreover, we find that the orbital eccentricity of each embryo is considerably excited (&apos;0.03) due to the presence of an asymmetric under-dense lobe of gas - a so-called &quot;hot trail&quot; - produced by accretion heating of the embryo&apos;s vicinity. Eccentric orbits lead the embryos to frequent close encounters and make resonant locking more difficult. Conclusions. Embryo merging typically produces one massive core (&amp;10 ME ) in our simulations, orbiting near 10 AU. Pebble ac- cretion is naturally accompanied by the occurrence of eccentric orbits which should be considered in future efforts to explain the structure of exoplanetary systems.

Název v anglickém jazyce

Eccentricity excitation and merging of planetary embryos heated by pebble accretion

Popis výsledku anglicky

Methods. For the first time, we perform self-consistent global-scale radiative hydrodynamic simulations of a two-fluid protoplanetary disk consisting of gas and pebbles, the latter being accreted by embedded embryos. Accretion heating, along with other radiative processes, is accounted for to correctly model the Type-I migration. Results. We track the evolution of four super-Earth-like embryos, initially located in a region where the disk structure allows for a convergent migration. Generally, embryo merging is facilitated by rapidly increasing embryo masses and breaks the otherwise oligarchic growth. Moreover, we find that the orbital eccentricity of each embryo is considerably excited (&apos;0.03) due to the presence of an asymmetric under-dense lobe of gas - a so-called &quot;hot trail&quot; - produced by accretion heating of the embryo&apos;s vicinity. Eccentric orbits lead the embryos to frequent close encounters and make resonant locking more difficult. Conclusions. Embryo merging typically produces one massive core (&amp;10 ME ) in our simulations, orbiting near 10 AU. Pebble ac- cretion is naturally accompanied by the occurrence of eccentric orbits which should be considered in future efforts to explain the structure of exoplanetary systems.

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/GA13-01308S" target="_blank" >GA13-01308S: Dynamika malých těles sluneční soustavy</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

606

Číslo periodika v rámci svazku

říjen

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

25

Strana od-do

—

Kód UT WoS článku

000413564000003

EID výsledku v databázi Scopus

—