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dc.creatorDupuy, Trent J.en_US
dc.creatorLiu, Michael C.en_US
dc.creatorLeggett, S. K.en_US
dc.date.accessioned2016-04-28T19:41:10Z
dc.date.available2016-04-28T19:41:10Z
dc.date.issued2015-04en
dc.identifierdoi:10.15781/T2NV6V
dc.identifier.citationDupuy, Trent J., Michael C. Liu, and S. K. Leggett. "Discovery of a Low-luminosity, Tight Substellar Binary at the T/Y Transition." The Astrophysical Journal, Vol. 803, No. 2 (Apr., 2015): 102.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35100
dc.description.abstractWe have discovered that the brown dwarf WISE J014656.66+423410.0 is a close binary (0 ''.0875 +/- 0 ''.0021, 0.93(-0.16)(+0.12) AU) from Keck laser guide star adaptive optics imaging. Our photometry for this system reveals that both components are less luminous than those in any known substellar binary. Combining a new integrated-light spectrum (T9p) and resolved YJH-band photometry from Keck allows us to perform spectral decomposition and assign component types of T9 and Y0. Many of the unusual features in the spectrum might be explained by high surface gravity: Y-band peak broadened to the blue; J-band peak broadened to the red; H-band peak shifted slightly to the red; and red Y - J colors. Interestingly, the very low component luminosities imply that the T9 primary is unexpectedly cold (T-eff = 345 +/- 45 K assuming an age of 10 Gyr), making it approximate to 100 K cooler than any other late-T dwarf and comparable to Y dwarfs. One intriguing explanation for this apparent discrepancy is that the J- and H-band spectral features that trigger the transition from T to Y spectral types are highly gravity dependent. This can be tested directly in the very near future by orbit monitoring. We constrain the orbital period to be less than or similar to 10 yr by combining evolutionary-model-based mass estimates for the components (approximate to 12-21M(Jup), 1 sigma at 10 Gyr) with a statistical constraint on the semimajor axis (less than or similar to 1.3 AU). Such a period is shorter than any other known T/Y transition binary, meaning that WISE J0146+4234AB will likely yield a dynamical mass within the next few years.en_US
dc.description.sponsorshipNASA Keck PI Data Awarden_US
dc.description.sponsorshipHubble Fellowship grant HST-HF-51271.01en_US
dc.description.sponsorshipNASA NAS 5-26555en_US
dc.description.sponsorshipNSF AST09-09222, GN-2012B-DD-5en_US
dc.description.sponsorshipW.M. Keck Foundationen_US
dc.description.sponsorshipGemini GN-2012B-DD-5en_US
dc.description.sponsorshipNational Science Foundation (United States) GN-2012B-DD-5en_US
dc.description.sponsorshipNational Research Council (Canada) GN-2012B-DD-5en_US
dc.description.sponsorshipCONICYT (Chile) GN-2012B-DD-5en_US
dc.description.sponsorshipAustralian Research Council (Australia) GN-2012B-DD-5en_US
dc.description.sponsorshipMinisterio da Ciencia, Tecnologia e Inovacao (Brazil) GN-2012B-DD-5en_US
dc.description.sponsorshipMinisterio de Ciencia, Tecnologia e Innovacion Productiva (Argentina) GN-2012B-DD-5en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectbinaries: closeen_US
dc.subjectbinaries: visualen_US
dc.subjectbrown dwarfsen_US
dc.subjectinfrared: starsen_US
dc.subjectplanets and satellites: atmospheresen_US
dc.subjectstars: individual (wiseen_US
dc.subjectj014656.66+423410.0)en_US
dc.subjectextrasolar giant planetsen_US
dc.subjectnear-infrared photometryen_US
dc.subjectadaptive opticsen_US
dc.subjectsystemen_US
dc.subjectbrown dwarfen_US
dc.subjecty dwarfsen_US
dc.subjectdynamical massen_US
dc.subjectt-dwarfen_US
dc.subjectl/t transitionen_US
dc.subjectwater cloudsen_US
dc.subjectwiseen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleDiscovery Of A Low-Luminosity, Tight Substellar Binary At The T/Y Transitionen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2015_04_tightsubstellarbinary.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/803/2/102en_US
dc.title.serialAstrophysical Journalen_US
dc.contributor.utaustinauthorDupuy, Trent J.en_US


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