SIMBAD references

2012MNRAS.422L..24Q - Mon. Not. R. Astron. Soc., 422, L24-L27 (2012/May-1)

A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae.

QIAN S.-B., LIU L., ZHU L.-Y., DAI Z.-B., FERNANDEZ LAJUS E. and BAUME G.L.

Abstract (from CDS):

By using six newly determined mid-eclipse times together with those collected from the literature, we have found that the observed minus calculated (O-C) curve of RR Cae shows a cyclic change with a period of 11.9 yr and an amplitude of 14.3 s while it undergoes an upward parabolic variation [revealing a long-term period increase at a rate of {img}]. The cyclic change was analysed for the light-travel-time effect that arises from the gravitational influence of a third companion. The mass of the third body was determined to be M3 sin i'= 4.2(± 0.4) MJup, suggesting that it is a circumbinary giant planet when its orbital inclination is larger than 17{img}6. The orbital separation of the circumbinary planet from the central eclipsing binary is about 5.3(± 0.6) au. The period increase is opposite to the changes caused by angular momentum loss via magnetic braking or/and gravitational radiation; and it cannot be explained by the mass transfer between both components because of its detached configuration. These indicate that the observed upward parabolic change is only a part of a long-period (longer than 26.3 yr) cyclic variation, which may reveal the presence of another giant circumbinary planet in a wide orbit.

Abstract Copyright: 2012 The Authors. Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): binaries: close - binaries: eclipsing - stars: individual: RR Cae - planetary systems - white dwarfs

Simbad objects: 9

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2023.01.28-16:52:31

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