Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir
We report here the tentative discovery of a Jovian planet in orbit around the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using newly determined eclipse times together with those collected from the literature, we detect that the observed-calculated (O - C) curve of NY Vi...
Guardado en:
| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2012
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84295 |
| Aporte de: |
| id |
I19-R120-10915-84295 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas binaries: close binaries: eclipsing planetary systems stars: individual (NY Vir) subdwarfs |
| spellingShingle |
Ciencias Astronómicas binaries: close binaries: eclipsing planetary systems stars: individual (NY Vir) subdwarfs Qian, S. B. Zhu, L. Y. Dai, Z. B. Fernández Lajús, Eduardo Xiang, F. Y. He, J. J. Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| topic_facet |
Ciencias Astronómicas binaries: close binaries: eclipsing planetary systems stars: individual (NY Vir) subdwarfs |
| description |
We report here the tentative discovery of a Jovian planet in orbit around the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using newly determined eclipse times together with those collected from the literature, we detect that the observed-calculated (O - C) curve of NY Vir shows a small-amplitude cyclic variation with a period of 7.9yr and a semiamplitude of 6.1s, while it undergoes a downward parabolic change (revealing a period decrease at a rate of ). The periodic variation was analyzed for the light-travel-time effect via the presence of a third body. The mass of the tertiary companion was determined to be M 3sin i′ = 2.3( 0.3)M Jupiter when a total mass of 0.60 M ⊙ for NY Vir is adopted. This suggests that it is most probably a giant circumbinary planet orbiting NY Vir at a distance of about 3.3 astronomical units (AU). Since the rate of period decrease cannot be explained by true angular momentum loss caused by gravitational radiation or/and magnetic braking, the observed downward parabolic change in the O - C diagram may be only a part of a long-period (longer than 15years) cyclic variation, which may reveal the presence of another Jovian planet (2.5 M Jupiter) in the system. |
| format |
Articulo Articulo |
| author |
Qian, S. B. Zhu, L. Y. Dai, Z. B. Fernández Lajús, Eduardo Xiang, F. Y. He, J. J. |
| author_facet |
Qian, S. B. Zhu, L. Y. Dai, Z. B. Fernández Lajús, Eduardo Xiang, F. Y. He, J. J. |
| author_sort |
Qian, S. B. |
| title |
Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| title_short |
Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| title_full |
Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| title_fullStr |
Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| title_full_unstemmed |
Circumbinary planets orbiting the rapidly pulsating subdwarf B-type binary Ny Vir |
| title_sort |
circumbinary planets orbiting the rapidly pulsating subdwarf b-type binary ny vir |
| publishDate |
2012 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84295 |
| work_keys_str_mv |
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