Temperature constraints on the coldest brown dwarf known: WISE 0855-0714

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dc.contributor.authorBeamín J.C.
dc.contributor.authorIvanov V.D.
dc.contributor.authorBayo A.
dc.contributor.authorMužić K.
dc.contributor.authorBoffin H.M.J.
dc.contributor.authorAllard F. f; Homeier D.
dc.contributor.authorMinniti D.
dc.contributor.authorGromadzki M.
dc.contributor.authorKurtev R.
dc.contributor.authorLodieu N.
dc.contributor.authorMartin E.L.
dc.contributor.authorMendez R.A.
dc.date.accessioned2024-10-01T17:06:17Z
dc.date.available2024-10-01T17:06:17Z
dc.date.issued2014-12
dc.descriptionIndexación: Scopus
dc.description.abstractContext. Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. Aims. We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714, located ~2.2 pc away, and to improve its temperature estimate (Teff = 225-260 K) from a comparison with state-of-the-art models of BD atmospheres. Methods. We observed the field containing WISE0855-0714 with HAWK-I at the VLT in the Y band. For BDs with Teff< 500 K theoretical models predict strong signal (or rather less molecular absorption) in this band. Results. WISE0855-0714 was not detected in our Y-band images, thus placing an upper limit on its brightness to Y> 24.4 mag at 3σ level, leading to Y-[4.5] > 10.5. Combining this limit with previous detections and upper limits at other wavelengths, WISE0855-0714 is confirmed as the reddest BD detected, further supporting its status as the coldest known brown dwarf. We applied spectral energy distribution fitting with collections of models from two independent groups for extremely cool BD atmospheres leading to an effective temperature of Teff< 250 K, © 2014 ESO.
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2014/10/aa24505-14/aa24505-14.html
dc.identifier.citationAstronomy and Astrophysics Volume 5701 October 2014 Article number L8
dc.identifier.doi10.1051/0004-6361/201424505
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/60699
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseAttribution 4.0 International CC BY 4.0 Deed
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.en
dc.subjectBrown dwarfs
dc.subjectInfrared: stars
dc.subjectProper motions
dc.subjectSolar neighborhood
dc.subjectStars: individual: WISE 0855-0714
dc.subjectStars: low-mass
dc.titleTemperature constraints on the coldest brown dwarf known: WISE 0855-0714
dc.typeArtículo
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