NY Vir Eclipse timing observations: Two planet solution
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2018
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| _version_ | 1866911964239757312 |
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| author | Song, Shuo Mai, Xinyu Mutel, Robert L. Pulley, Dvaid Faillace, George Watkins, Americo |
| author_facet | Song, Shuo Mai, Xinyu Mutel, Robert L. Pulley, Dvaid Faillace, George Watkins, Americo |
| contents | We report 18 new primary minima timing observations of the short-period eclipsing binary system NY Virginis. We combined these minima with previously published primary minima to update circumbinary exoplanet models in this system based on O-C timing variations. We performed a non-linear least-squares minimization search using a quadratic ephemeris and either one or two exoplanets. The only model with an acceptable fit includes a period derivative $\dot{P} = 2.83\times10^{-12}$ and two planets in eccentric orbits $e = 0.15,0.15$ with minimum masses 2.7 and 5.5 Jovian masses. Analysis of the orbit stability shows that this solution is stable for at least $10^8$ yr, but a small increase in eccentricity ($e\geq0.20$) for either planet renders the orbits unstable in less than $10^6$ years. A number of model parameters are significantly degenerate, so additional observations are required to determine planetary parameters with high statistical confidence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1812_01726 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | NY Vir Eclipse timing observations: Two planet solution Song, Shuo Mai, Xinyu Mutel, Robert L. Pulley, Dvaid Faillace, George Watkins, Americo Earth and Planetary Astrophysics We report 18 new primary minima timing observations of the short-period eclipsing binary system NY Virginis. We combined these minima with previously published primary minima to update circumbinary exoplanet models in this system based on O-C timing variations. We performed a non-linear least-squares minimization search using a quadratic ephemeris and either one or two exoplanets. The only model with an acceptable fit includes a period derivative $\dot{P} = 2.83\times10^{-12}$ and two planets in eccentric orbits $e = 0.15,0.15$ with minimum masses 2.7 and 5.5 Jovian masses. Analysis of the orbit stability shows that this solution is stable for at least $10^8$ yr, but a small increase in eccentricity ($e\geq0.20$) for either planet renders the orbits unstable in less than $10^6$ years. A number of model parameters are significantly degenerate, so additional observations are required to determine planetary parameters with high statistical confidence. |
| title | NY Vir Eclipse timing observations: Two planet solution |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/1812.01726 |