Time-scales to reach chemical equilibrium in ices at snowline distance around compact objects: the influence of accretion mass in the central object

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dc.contributor.authorCarvalho, Geanderson Araújo
dc.contributor.authorPilling, Sergio
dc.date.accessioned2025-04-08T18:52:18Z
dc.date.available2025-04-08T18:52:18Z
dc.date.issued22021
dc.description.abstractIn this work, we analyse soft X-ray emission due to mass accretion on to compact stars and its effects on the time-scale to reach chemical equilibrium of eventual surrounding astrophysical ices exposed to that radiation. Reaction time-scales due to soft X-ray in water-rich and pure ices of methanol, acetone, acetonitrile, formic acid, and acetic acid were determined. For accretion rates in the range m˙ = 10−12–10−8 M yr−1 and distances in the range 1–3 LY from the central compact objects, the time-scales lie in the range 10–108 yr, with shorter time-scales corresponding to higher accretion rates. Obtained time-scales for ices at snow-line distances can be small when compared to the lifetime (or age) of the compact stars, showing that chemical equilibrium could have been achieved. Time-scales for ices to reach chemical equilibrium depend on X-ray flux and, hence, on accretion rate, which indicates that systems with low accretion rates may not have reached chemical equilibrium.
dc.description.physical6 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriCNPq (projects #304130/2012-5; #306145/ 2015- 4; #302985/2018-2) FAPESP (projects JP 2009/18304-0) CAPES (grant PNPD/88887.368365/2019-00)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.bibliographicCitationCARVALHO, Geanderson Araújo; PILLING, Sergio. Time-scales to reach chemical equilibrium in ices at snowline distance around compact objects: the influence of accretion mass in the central object. Monthly Notices of the Royal Astronomical Society, v. 503, n. 2, p. 2973-2978, 2021. Disponivel em:
dc.identifier.doi10.1093/mnras/stab641
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/828
dc.language.isoen_US
dc.publisherRoyal Astronomical Society
dc.rights.holderMonthly Notices of the Royal Astronomical Society
dc.subject.keywordAstrochemistry
dc.subject.keywordStars:blackholes
dc.subject.keywordWhitedwarfs
dc.subject.keywordX-rays:stars
dc.titleTime-scales to reach chemical equilibrium in ices at snowline distance around compact objects: the influence of accretion mass in the central object
dc.typeArtigos de Periódicos

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