Characterising young eclipsing binaries and their environments in NGC 2264

Gillen, E

Abstract:: Stellar evolution models underpin much of astrophysics, yet they are severely under-constrained on the pre-main sequence. The masses, radii, temperatures and luminosities of detached double-lined eclipsing binaries (EBs) can be determined in a model-independent manner from the light and radial velocity curves of the system. When these reach a precision of a few percent or less, they provide one of the most powerful observational tests of stellar evolution theory. Furthermore, young binary ...
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APA Style

Gillen, E. (2015). Characterising young eclipsing binaries and their environments in NGC 2264 [PhD thesis]. University of Oxford.

MLA Style

Gillen, E. Characterising Young Eclipsing Binaries and Their Environments in NGC 2264. University of Oxford, 2015.

Chicago Style

Gillen, E. 2015. “Characterising Young Eclipsing Binaries and Their Environments in NGC 2264.” PhD thesis, University of Oxford.
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Files:: Gillen_2015_Characterising_young_eclipsing.pdf

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Authors

+ Gillen, E More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Astrophysics
Oxford college:: Oriel College
Role:: Author

Contributors

+ Aigrain, S

Role:: Supervisor

+ Science and Technology Facilities Council More from this funder

Funder identifier:: https://ror.org/057g20z61
Funding agency for:: Gillen, E
Grant:: ST/J500641/1

Type of award:: DPhil
Level of award:: Doctoral
Awarding institution:: University of Oxford

Language:: English
UUID:: uuid:94ab97f9-0b50-48a0-91fc-6e478f9a2aa8
Deposit date:: 2016-06-29

Related item:: CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
Description:: We present the discovery of CoRoT 223992193, a double-lined, detached eclipsing binary, comprising two pre-main sequence M dwarfs, discovered by the CoRoT space mission during a 23-day observation of the 3 Myr old NGC 2264 star-forming region. Using multi-epoch optical and near-IR follow-up spectroscopy with FLAMES on the Very Large Telescope and ISIS on the William Herschel Telescope we obtain a full orbital solution and derive the fundamental parameters of both stars by modelling the light curve and radial velocity data. The orbit is circular and has a period of 3.8745745 ± 0.0000014 days. The masses and radii of the two stars are 0.67 ± 0.01 and 0.495 ± 0.007 M⊙ and 1.30 ± 0.04 and 1.11-0.05+0.04 R⊙, respectively. This system is a useful test of evolutionary models of young low-mass stars, as it lies in a region of parameter space where observational constraints are scarce; comparison with these models indicates an apparent age of ~3.5–6 Myr. The systemic velocity is within 1σ of the cluster value which, along with the presence of lithium absorption, strongly indicates cluster membership. The CoRoT light curve also contains large-amplitude, rapidly evolving out-of-eclipse variations, which are difficult to explain using starspots alone. The system’s spectral energy distribution reveals a mid-infrared excess, which we model as thermal emission from a small amount of dust located in the inner cavity of a circumbinary disk. In turn, this opens up the possibility that some of the out-of-eclipse variability could be due to occultations of the central stars by material located at the inner edge or in the central cavity of the circumbinary disk.

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Copyright holder:: Edward Gillen

Licence:: Terms and Conditions of Use for Oxford University Research Archive

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Characterising young eclipsing binaries and their environments in NGC 2264

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Characterising young eclipsing binaries and their environments in NGC 2264

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