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Discovery and characterization of 3000+ main-sequence binaries from APOGEE spectra

El-Badry, Kareem; Ting, Yuan; Rix, Hans-Walter; Quataert, Elliot; Weisz, Daniel R; Cargile, Phillip A.; Conroy, Charlie; Hogg, David W.; Bergemann, Maria; Liu, Chao

Description

We develop a data-driven spectral model for identifying and characterizing spatially unresolved multiple-star systems and apply it to APOGEE DR13 spectra of main-sequence stars. Binaries and triples are identified as targets whose spectra can be significantly better fit by a superposition of two or three model spectra, drawn from the same isochrone, than any single-star model. From an initial sample of ∼20 000 main-sequence targets, we identify ∼2500 binaries in which both the primary and...[Show more]

dc.contributor.authorEl-Badry, Kareem
dc.contributor.authorTing, Yuan
dc.contributor.authorRix, Hans-Walter
dc.contributor.authorQuataert, Elliot
dc.contributor.authorWeisz, Daniel R
dc.contributor.authorCargile, Phillip A.
dc.contributor.authorConroy, Charlie
dc.contributor.authorHogg, David W.
dc.contributor.authorBergemann, Maria
dc.contributor.authorLiu, Chao
dc.date.accessioned2019-04-08T11:39:18Z
dc.date.available2019-04-08T11:39:18Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/159340
dc.description.abstractWe develop a data-driven spectral model for identifying and characterizing spatially unresolved multiple-star systems and apply it to APOGEE DR13 spectra of main-sequence stars. Binaries and triples are identified as targets whose spectra can be significantly better fit by a superposition of two or three model spectra, drawn from the same isochrone, than any single-star model. From an initial sample of ∼20 000 main-sequence targets, we identify ∼2500 binaries in which both the primary and secondary stars contribute detectably to the spectrum, simultaneously fitting for the velocities and stellar parameters of both components. We additionally identify and fit ∼200 triple systems, as well as ∼700 velocity-variable systems in which the secondary does not contribute detectably to the spectrum. Our model simplifies the process of simultaneously fitting single- or multi-epoch spectra with composite models and does not depend on a velocity offset between the two components of a binary, making it sensitive to traditionally undetectable systems with periods of hundreds or thousands of years. In agreement with conventional expectations, almost all the spectrally identified binaries with measured parallaxes fall above the main sequence in the colour–magnitude diagram. We find excellent agreement between spectrally and dynamically inferred mass ratios for the ∼600 binaries in which a dynamical mass ratio can be measured from multi-epoch radial velocities. We obtain full orbital solutions for 64 systems, including 14 close binaries within hierarchical triples. We make available catalogues of stellar parameters, abundances, mass ratios, and orbital parameters.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights©. 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleDiscovery and characterization of 3000+ main-sequence binaries from APOGEE spectra
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume476
dc.date.issued2018
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationa383154xPUB9499
local.type.statusPublished Version
local.contributor.affiliationEl-Badry, Kareem, University of California
local.contributor.affiliationTing, Yuan, College of Science, ANU
local.contributor.affiliationRix, Hans-Walter, Max Planck Institute for Astronomy
local.contributor.affiliationQuataert, Elliot, Department of Astronomy and Theoretical Astrophysics Center
local.contributor.affiliationWeisz, Daniel R, University of California
local.contributor.affiliationCargile, Phillip A., Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationConroy, Charlie, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationHogg, David W., New York University
local.contributor.affiliationBergemann, Maria, Max Planck Institut fur Astrophysik
local.contributor.affiliationLiu, Chao, New York University
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage528
local.bibliographicCitation.lastpage553
local.identifier.doi10.1093/mnras/sty240
dc.date.updated2019-03-12T07:21:50Z
local.identifier.scopusID2-s2.0-85042711112
dcterms.accessRightsOpen Access
dc.provenanceJournal: Monthly Notices of the Royal Astronomical Society (ISSN: 0035-8711, ESSN: 1365-2966) RoMEO: This is a RoMEO green journal Paid OA: A paid open access option is available for this journal. Author's Pre-print: green tick author can archive pre-print (ie pre-refereeing) Author's Post-print: green tick author can archive post-print (ie final draft post-refereeing) Publisher's Version/PDF: green tick author can archive publisher's version/PDF General Conditions: Pre-print can only be posted prior to acceptance Pre-print on author's personal website, employer website, free public server or pre-prints in subject area Pre-print must be accompanied by set statement (see link) Pre-print set statement must be amended upon publication (see policy) Publisher's version/PDF may be used Author's Post-print on Institutional repositories or Central repositories Publisher's version/PDF on Institutional repositories or Central repositories, with all rights reserved (see policy) Published source must be acknowledged Must link to publisher version Set phrase to accompany archived copy (see policy
CollectionsANU Research Publications

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