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The age of the directly imaged planet host star k Andromedae determined from interferometric observations

Jones, Jeremy; White, R. J; Quinn, S; Ireland, Michael; Boyajian, T; Schaefer, G; Baines, Ellyn

Description

κ Andromedae, an early-type star that hosts a directly imaged low-mass companion, is expected to be oblate due to its rapid rotational velocity (v sin i = ~162 km s⁻¹). We observed the star with the CHARA Array's optical beam combiner, PAVO, measuring its size at multiple orientations and determining its oblateness. The interferometric measurements, combined with photometry and this v sin i value are used to constrain an oblate star model that yields the fundamental properties of the star and...[Show more]

dc.contributor.authorJones, Jeremy
dc.contributor.authorWhite, R. J
dc.contributor.authorQuinn, S
dc.contributor.authorIreland, Michael
dc.contributor.authorBoyajian, T
dc.contributor.authorSchaefer, G
dc.contributor.authorBaines, Ellyn
dc.date.accessioned2016-10-07T05:30:01Z
dc.date.available2016-10-07T05:30:01Z
dc.identifier.issn2041-8213
dc.identifier.urihttp://hdl.handle.net/1885/109183
dc.description.abstractκ Andromedae, an early-type star that hosts a directly imaged low-mass companion, is expected to be oblate due to its rapid rotational velocity (v sin i = ~162 km s⁻¹). We observed the star with the CHARA Array's optical beam combiner, PAVO, measuring its size at multiple orientations and determining its oblateness. The interferometric measurements, combined with photometry and this v sin i value are used to constrain an oblate star model that yields the fundamental properties of the star and finds a rotation speed that is ~85% of the critical rate and a low inclination of ~30°. Three modeled properties (the average radius, bolometric luminosity, and equatorial velocity) are compared to MESA evolution models to determine an age and mass for the star. In doing so, we determine an age for the system of 47_₄₀⁺²⁷ Myr. Based on this age and previous measurements of the companion's temperature, the BHAC15 evolution models imply a mass for the companion of 22_₉⁺⁸ MJ.
dc.description.sponsorshipThis work is based upon observations obtained with the Georgia State University Center for High Angular Resolution Astronomy Array at Mount Wilson Observatory. The CHARA Array is supported by the National Science Foundation under grants AST-1211929 and AST- 1411654. Institutional support has been provided from the GSU College of Arts and Sciences and the GSU Office of the Vice President for Research and Economic Development. J.J. and R.J.W. acknowledge support from NSF AAG grants 1009643 and 1517762.
dc.format7 pages
dc.publisherAmerican Astronomical Society
dc.rights© 2016. The American Astronomical Society. http://www.sherpa.ac.uk/romeo/issn/2041-8205/..."Publisher's version/PDF may be used on any website or authors' institutional repository" from SHERPA/RoMEO site (as at 7/10/16).
dc.sourceThe Astrophysical Journal
dc.titleThe age of the directly imaged planet host star k Andromedae determined from interferometric observations
dc.typeJournal article
local.identifier.citationvolume822
dc.date.issued2016-04-22
local.publisher.urlhttps://aas.org/
local.type.statusPublished Version
local.contributor.affiliationIreland, M., Research School of Astronomy and Astrophysics, The Australian National University
local.bibliographicCitation.issue1
local.bibliographicCitation.startpageL3
local.identifier.doi10.3847/2041-8205/822/1/L3
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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