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dc.contributor.authorWang, Z.
dc.contributor.authorTziamtzis, A.
dc.contributor.authorKaplan, D. L.
dc.contributor.authorChakrabarty, Deepto
dc.date.accessioned2017-04-14T14:30:04Z
dc.date.available2017-04-14T14:30:04Z
dc.date.issued2015-10
dc.identifier.issn1323-3580
dc.identifier.issn1448-6083
dc.identifier.urihttp://hdl.handle.net/1721.1/108164
dc.description.abstractThe X-ray binary 4U 1543–624 has been provisionally identified as an ultra-compact system with an orbital period of ≃ 18 min. We have carried out time-resolved optical imaging of the binary to verify the ultra-short orbital period. Using 140 min of high-cadence r′-band photometry, we recover the previously-seen sinusoidal modulation and determine a period P = 18.20 ± 0.09 min. In addition, we also see a 7.0 × 10⁻⁴ mag min⁻¹ linear decay, likely related to variations in the source's accretion activity. Assuming that the sinusoidal modulation arises from X-ray heating of the inner face of the companion star, we estimate a distance of 6.0–6.7 kpc and an inclination angle of 34°–61° (90% confidence) for the binary. Given the stability of the modulation, we can confirm that the modulation is orbital in origin and 4U 1543–624 is an ultra-compact X-ray binary.en_US
dc.language.isoen_US
dc.publisherCSIRO Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1017/pasa.2015.36en_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alikeen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en_US
dc.sourcearXiven_US
dc.titleOptical Modulation in the X-Ray Binary 4U 1543–624 Revisiteden_US
dc.typeArticleen_US
dc.identifier.citationWang, Z.; Tziamtzis, A.; Kaplan, D. L. and Chakrabarty, D. “Optical Modulation in the X-Ray Binary 4U 1543–624 Revisited.” Publications of the Astronomical Society of Australia 32 (2015). © 2015 Astronomical Society of Australiaen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Researchen_US
dc.contributor.mitauthorChakrabarty, Deepto
dc.relation.journalPublications of the Astronomical Society of Australiaen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsWang, Z.; Tziamtzis, A.; Kaplan, D. L.; Chakrabarty, D.en_US
dspace.embargo.termsNen_US
dc.identifier.orcidhttps://orcid.org/0000-0001-8804-8946
mit.licenseOPEN_ACCESS_POLICYen_US


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