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<br />the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using new determined eclipse times together those collected from the literature, we detect that the observed-calculated (O-C) curve of NY...

Full description

Bibliographic Details
Authors: Qian, S.-B., Zhu, L.-Y., Dai, Z.-B., Fernandez Lajus, Eduardo Eusebio, Xiang, F.-Y., He, J.-J.
Format: article
Status:Published version
Publication Date:2012
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/42477
Online Access:http://hdl.handle.net/11336/42477
Access Level:Open access
Keyword:Close binaries
Eclipsing binaries
NY VIR (estrella)
Subdwarfs
Planetary systems
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Description
Summary:We report here the tentative discovery of a Jovian planet in orbit around<br />the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using new determined eclipse times together 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 7.9 years and a semiamplitude of 6.1 s, while it undergoes a downward parabolic change (revealing a period decrease at a rate of _dP/dt = -9.2 x 10^-12). 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 M3 sin i´ = 2.3(+/-0.3) MJupiter when a total mass of 0.60 Msun for NY Vir is adopted. This suggests that it most probably is a giant circumbinary planet orbiting NY Vir at a distance of about 3.3 astronomical units (AU). Since the rate of period decrease can not 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 15 years) cyclic variation, which may reveal the presence of another Jovian planet (about 2.5 MJupiter) in the system.

Similar Items