Dynamics of baryon ejection in magnetar giant flares: implications for radio afterglows, r-process nucleosynthesis, and fast radio bursts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10491427" target="_blank" >RIV/00216208:11320/24:10491427 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=akw6-Jk_eZ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=akw6-Jk_eZ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stae358" target="_blank" >10.1093/mnras/stae358</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of baryon ejection in magnetar giant flares: implications for radio afterglows, r-process nucleosynthesis, and fast radio bursts

Popis výsledku v původním jazyce

We explore the impact of a magnetar giant flare (GF) on the neutron star (NS) crust, and the associated baryon mass ejection. We consider that sudden magnetic energy dissipation creates a thin high-pressure shell above a portion of the NS surface, which drives a relativistic shockwave into the crust, heating a fraction of these layers sufficiently to become unbound along directions unconfined by the magnetic field. We explore this process using spherically-symmetric relativistic hydrodynamical simulations. For an initial shell pressure PGF we find the total unbound ejecta mass roughly obeys the relation Mej similar to 4-9x10(24)g(PGF/10(30)ergscm(-3))(1.43). For PGF similar to 10(30)-10(31)ergscm(-3) corresponding to the dissipation of a magnetic field of strength similar to 10(15.5)-10(16)G, we find Mej similar to 10(25)-1026g with asymptotic velocities vej/c similar to 0.3-0.6 compatible with the ejecta properties inferred from the afterglow of the December 2004 GF from SGR 1806-20. Because the flare excavates crustal material to a depth characterized by an electron fraction Ye approximate to 0.40-0.46, and is ejected with high entropy and rapid expansion timescale, the conditions are met for heavy element r-process nucleosynthesis via the alpha-rich freeze-out mechanism. Given an energetic GF rate of roughly once per century in the Milky Way, we find that magnetar GFs could be an appreciable heavy r-process source that tracks star formation. We predict that GFs are accompanied by short similar to minutes long, luminous similar to 10(39)ergss(-1) optical transients powered by r-process decay (&quot;nova brevis&quot;), akin to scaled-down kilonovae. Our findings also have implications for the synchrotron nebulae surrounding some repeating fast radio burst sources.

Název v anglickém jazyce

Dynamics of baryon ejection in magnetar giant flares: implications for radio afterglows, r-process nucleosynthesis, and fast radio bursts

Popis výsledku anglicky

We explore the impact of a magnetar giant flare (GF) on the neutron star (NS) crust, and the associated baryon mass ejection. We consider that sudden magnetic energy dissipation creates a thin high-pressure shell above a portion of the NS surface, which drives a relativistic shockwave into the crust, heating a fraction of these layers sufficiently to become unbound along directions unconfined by the magnetic field. We explore this process using spherically-symmetric relativistic hydrodynamical simulations. For an initial shell pressure PGF we find the total unbound ejecta mass roughly obeys the relation Mej similar to 4-9x10(24)g(PGF/10(30)ergscm(-3))(1.43). For PGF similar to 10(30)-10(31)ergscm(-3) corresponding to the dissipation of a magnetic field of strength similar to 10(15.5)-10(16)G, we find Mej similar to 10(25)-1026g with asymptotic velocities vej/c similar to 0.3-0.6 compatible with the ejecta properties inferred from the afterglow of the December 2004 GF from SGR 1806-20. Because the flare excavates crustal material to a depth characterized by an electron fraction Ye approximate to 0.40-0.46, and is ejected with high entropy and rapid expansion timescale, the conditions are met for heavy element r-process nucleosynthesis via the alpha-rich freeze-out mechanism. Given an energetic GF rate of roughly once per century in the Milky Way, we find that magnetar GFs could be an appreciable heavy r-process source that tracks star formation. We predict that GFs are accompanied by short similar to minutes long, luminous similar to 10(39)ergss(-1) optical transients powered by r-process decay (&quot;nova brevis&quot;), akin to scaled-down kilonovae. Our findings also have implications for the synchrotron nebulae surrounding some repeating fast radio burst sources.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

R - Projekt Ramcoveho programu EK

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

528

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

5323-5345

Kód UT WoS článku

001177394000013

EID výsledku v databázi Scopus

2-s2.0-85185405290