Common-envelope ejection in massive binary stars Implications for the progenitors of GW150914 and GW151226

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00472116" target="_blank" >RIV/67985815:_____/16:00472116 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201629420" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201629420</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201629420" target="_blank" >10.1051/0004-6361/201629420</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Common-envelope ejection in massive binary stars Implications for the progenitors of GW150914 and GW151226

Popis výsledku v původním jazyce

We analyse the common-envelope (CE) stage of the traditional formation channel in binaries where the first-formed compact object undergoes an in-spiral inside the envelope of its evolved companion star and ejects the envelope in this process. Massive stars in a wide range of metallicities and with initial masses of up to at least 115 M-circle dot may shed their envelopes and survive CE evolution, depending on their initial orbital parameters, similarly to the situation for intermediate-and low-mass stars with degenerate cores. In addition to being dependent on stellar radius, the envelope binding energies and lambda-values also depend on the applied convective core-overshooting parameter, whereas these structure parameters are basically independent of metallicity for stars with initial masses below 60 M-circle dot. Metal-rich stars greater than or similar to 60 M-circle dot become luminous blue variables and do not evolve to reach the red giant stage. We conclude that based on stellar structure calculations, and in the view of the usual simple energy budget analysis, events like GW150914 and GW151226 might be produced by the CE channel. Calculations of post-CE orbital separations, however, and thus the estimated LIGO detection rates, remain highly uncertain.

Název v anglickém jazyce

Common-envelope ejection in massive binary stars Implications for the progenitors of GW150914 and GW151226

Popis výsledku anglicky

We analyse the common-envelope (CE) stage of the traditional formation channel in binaries where the first-formed compact object undergoes an in-spiral inside the envelope of its evolved companion star and ejects the envelope in this process. Massive stars in a wide range of metallicities and with initial masses of up to at least 115 M-circle dot may shed their envelopes and survive CE evolution, depending on their initial orbital parameters, similarly to the situation for intermediate-and low-mass stars with degenerate cores. In addition to being dependent on stellar radius, the envelope binding energies and lambda-values also depend on the applied convective core-overshooting parameter, whereas these structure parameters are basically independent of metallicity for stars with initial masses below 60 M-circle dot. Metal-rich stars greater than or similar to 60 M-circle dot become luminous blue variables and do not evolve to reach the red giant stage. We conclude that based on stellar structure calculations, and in the view of the usual simple energy budget analysis, events like GW150914 and GW151226 might be produced by the CE channel. Calculations of post-CE orbital separations, however, and thus the estimated LIGO detection rates, remain highly uncertain.

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/GA14-02385S" target="_blank" >GA14-02385S: Přenos polarizovaného záření ve hvězdných atmosférách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

596

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

13

Strana od-do

"A58/1"-"A58/13"

Kód UT WoS článku

000390797900106

EID výsledku v databázi Scopus

2-s2.0-85002935925