dc.contributor.author | Wang, Z. | |
dc.contributor.author | Tziamtzis, A. | |
dc.contributor.author | Kaplan, D. L. | |
dc.contributor.author | Chakrabarty, Deepto | |
dc.date.accessioned | 2017-04-14T14:30:04Z | |
dc.date.available | 2017-04-14T14:30:04Z | |
dc.date.issued | 2015-10 | |
dc.identifier.issn | 1323-3580 | |
dc.identifier.issn | 1448-6083 | |
dc.identifier.uri | http://hdl.handle.net/1721.1/108164 | |
dc.description.abstract | The 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.iso | en_US | |
dc.publisher | CSIRO Publishing | en_US |
dc.relation.isversionof | http://dx.doi.org/10.1017/pasa.2015.36 | en_US |
dc.rights | Creative Commons Attribution-Noncommercial-Share Alike | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | en_US |
dc.source | arXiv | en_US |
dc.title | Optical Modulation in the X-Ray Binary 4U 1543–624 Revisited | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Wang, 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 Australia | en_US |
dc.contributor.department | Massachusetts Institute of Technology. Department of Physics | en_US |
dc.contributor.department | MIT Kavli Institute for Astrophysics and Space Research | en_US |
dc.contributor.mitauthor | Chakrabarty, Deepto | |
dc.relation.journal | Publications of the Astronomical Society of Australia | en_US |
dc.eprint.version | Author's final manuscript | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dspace.orderedauthors | Wang, Z.; Tziamtzis, A.; Kaplan, D. L.; Chakrabarty, D. | en_US |
dspace.embargo.terms | N | en_US |
dc.identifier.orcid | https://orcid.org/0000-0001-8804-8946 | |
mit.license | OPEN_ACCESS_POLICY | en_US |