Bibcode
Vázquez-Martín, S.; Deeg, H. J.; Dreizler, S.; von Essen, C.; Kozhevnikov, V. P.
Referencia bibliográfica
Highlights of Spanish Astrophysics VIII, Proceedings of the XI Scientific Meeting of the Spanish Astronomical Society held on September 8-12, 2014, in Teruel, Spain, ISBN 978-84-606-8760-3. A. J. Cenarro, F. Figueras, C. Hernández-Monteagudo, J. Trujillo Bueno, and L. Valdivielso (eds.), p. 618-618
Fecha de publicación:
5
2015
Número de citas
0
Número de citas referidas
0
Descripción
Periodic deviations from a linear ephemeris of a binary star's eclipses
can indicate the presence of a third body in orbit around both. Hints
for such companion around the M4.5/M4.5 binary CMDra were published by
Deeg et al. (2008). The assignment of a planet in the CMDra system can
however only be accepted if the earlier observed periodicity trends can
be verified through further observations over several years. For
eclipsing binary stars of low mass, the method of eclipse minimum timing
allows one to set mass limits for the detection of a third body. Deeg et
al. (2008) concluded that the two possibilities for the source of
CMDra's timing variations that remain valid are a planet of a few
Jupiter masses on a two decade-long orbit, or an object on a
century-to-millenium long orbit with masses 1.5M_J < M_{p} <
0.1M_{⊙}. However, they concluded that it is necessary to do
continued observations of the timing of CMDra's eclipses to be decisive
regarding the continued viability of the sinusoidal-fit-model, and
hence, about the validity of a Jovian-type planet in a circumbinary
orbiting around the system. Here we update the analysis of Deeg et al.
(2008), including further data presented in Morales et al. (2009r) and
new observations taken at Ural Observatory (2008-2013). Eclipse minimum
times were obtained using the Kwee-van-Woerden method.