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dc.contributor.author
Han, Z.-T  
dc.contributor.author
Qian, S.-B  
dc.contributor.author
Han, Q.-W  
dc.contributor.author
Zang, L.  
dc.contributor.author
Soonthornthum, B.  
dc.contributor.author
Li, L. -J  
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Zhu, L. -Y.  
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Liu, W.  
dc.contributor.author
Fernandez Lajus, Eduardo Eusebio  
dc.contributor.author
Dai, Z. -B  
dc.contributor.author
Na, W. -W  
dc.date.available
2024-05-17T14:30:31Z  
dc.date.issued
2023-08  
dc.identifier.citation
Han, Z.-T; Qian, S.-B; Han, Q.-W; Zang, L.; Soonthornthum, B.; et al.; Orbital period variations in HT Cas: evidence for additional angular momentum loss and a High-eccentricity Giant Planet; IOP Publishing; Astrophysical Journal; 953; 1; 8-2023; 63, 1-12  
dc.identifier.issn
0004-637X  
dc.identifier.uri
http://hdl.handle.net/11336/235638  
dc.description.abstract
We present a timing study of the short-period eclipsing cataclysmic variable (CV) HT Cas. Based on new eclipse times derived from our photometric monitoring and archival optical data, combined with historical timings, spanning ∼42 yr, we detect a secular decrease in the orbital period at a rate of  and a cyclic period wiggle with an amplitude of 79.3 s and a period of 30.28 yr. We find that neither gravitational radiation nor magnetic braking can explain the observed decrease rate, suggesting the presence of additional angular momentum loss (AML). The empirical consequential AML (eCAML) model developed by Schreiber et al. can well match the observed orbital decay in HT Cas, and the physical mechanism for eCAML is most likely attributable to the frictional AML following nova eruptions. As for the cyclic variation, the best explanation is the influence of an unseen companion in orbit around the binary. The derived orbital parameters reveal that the hypothetical third body could be a giant planet with mass of M3 ≃ 14MJup that is moving on a highly eccentric orbit (e = 0.82). Taken together the results of the present study suggest that HT Cas is a unique triple system containing a high-eccentricity giant planet and it has the potential to become an ideal laboratory in which to test models of CV evolution.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
IOP Publishing  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Close binary stars (254)  
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Eclipsing binary stars (444)  
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Cataclysmic variable stars (203)  
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Dwarf novae (418)  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Orbital period variations in HT Cas: evidence for additional angular momentum loss and a High-eccentricity Giant Planet  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2024-05-07T13:38:24Z  
dc.journal.volume
953  
dc.journal.number
1  
dc.journal.pagination
63, 1-12  
dc.journal.pais
Reino Unido  
dc.description.fil
Fil: Han, Z.-T. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Qian, S.-B. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Han, Q.-W. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Zang, L.. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Soonthornthum, B.. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Li, L. -J. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Zhu, L. -Y.. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Liu, W.. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Fernandez Lajus, Eduardo Eusebio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina  
dc.description.fil
Fil: Dai, Z. -B. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.description.fil
Fil: Na, W. -W. Chinese Academy Of Sciences. Yunnan Observatories; China  
dc.journal.title
Astrophysical Journal  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/acdd6e  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4357/acdd6e