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Accretion signatures in the X-shooter spectrum of the substellar companion to SR12

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dc.abstract.enAbout a dozen substellar companions orbiting young stellar objects or pre-main sequence stars at several hundred au have been identified in the last decade. These objects are interesting both due to the uncertainties surrounding their formation, and because their large separation from the host star offers the potential to study the atmospheres of young giant planets and brown dwarfs. Here, we present X-shooter spectroscopy of SR 12 C, a ˜2 Myr young brown dwarf orbiting SR 12 at an orbital separation of 1083 au. We determine the spectral type, gravity, and effective temperature via comparison with models and observational templates of young brown dwarfs. In addition, we detect and characterize accretion using several accretion tracers. We find SR 12 C to be a brown dwarf of spectral type L0 ± 1, log g = 4 ± 0.5, an effective temperature of 2600 ± 100 K. Our spectra provide clear evidence for accretion at a rate of ˜10<SUP>-10</SUP> M<SUB>⊙</SUB> yr<SUP>-1</SUP>. This makes SR 12 one of the few sub-stellar companions with a reliable estimate for its accretion rate. A comparison of the ages and accretion rates of sub-stellar companions with young isolated brown dwarfs does not reveal any significant differences. If further accretion rate measurements of a large number of substellar companions can confirm this trend, this would hint towards a similar formation mechanism for substellar companions at large separations and isolated brown dwarfs.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSantamaría-Miranda, Alejandro
dc.contributor.authorCáceres, Claudio
dc.contributor.authorSchreiber, Matthias R.
dc.contributor.authorHardy, Adam
dc.contributor.authorBayo, Amelia
dc.contributor.authorParsons, Steven G.
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorVillegas, Aurora Belén Aguayo
dc.date.accessioned2024-01-24T15:37:34Z
dc.date.available2024-01-24T15:37:34Z
dc.date.copyright2017-12-26
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume475
dc.identifier.doi10.1093/MNRAS/STX3325
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100178
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018MNRAS.475.2994S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages2994-3003
dc.rightsOther
dc.sciencecloudnosend
dc.titleAccretion signatures in the X-shooter spectrum of the substellar companion to SR12
dc.typeJournalArticle
dspace.entity.typePublication