Bibcode
Alonso, R.; Barbieri, M.; Rabus, M.; Deeg, H. J.; Belmonte, J. A.; Almenara, J. M.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 487, Issue 1, 2008, pp.L5-L8
Advertised on:
8
2008
Revista
Número de citas
68
Número de citas referidas
56
Descripción
We report on H-band, ground-based observations of a transit of the hot
Neptune GJ 436b. Once combined to achieve sampling equivalent to
archived observations taken with Spitzer, our measurements reach
comparable precision levels. We analyze both sets of observations in a
consistent way, and measure the rate of orbital inclination change to be
of 0.02 ± 0.04° in the time span between the two observations
(253.8 d, corresponding to 0.03 ± 0.05° yr-1 if
extrapolated). This rate allows us to put limits on the relative
inclination between the two planets by performing simulations of
planetary systems, including a second planet, GJ 436c, whose presence
has been recently suggested (Ribas et al. 2008). The allowed
inclinations for a 5 M⊕ super-Earth GJ 436c in a 5.2 d
orbit are within ~7° of the orbit of GJ 436b; for larger differences
the observed inclination change can be reproduced only during short
sections (<50%) of the orbital evolution of the system. The measured
times of three transit centers of the system do not show any departure
from linear ephemeris, a result that is only reproduced in <1% of the
simulated orbits. Put together, these results argue against the proposed
planet candidate GJ 436c.
Based on observations taken with the Telescopio Carlos Sánchez
(TCS) of the Observatorio del Teide, operated by the Instituto de
Astrofísica de Canarias.
Proyectos relacionados
![Helio and Asteroseismologia Helio and Asteroseismologia](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20PLP.jpg?h=457caa5a&itok=vvERQ8Xk)
Sismología Solar y Estelar y Búsqueda de Exoplanetas
Los objetivos genéricos de este Proyecto son: 1) el estudio de la estructura y dinámica del interior solar, 2) la extensión de dicho estudio al caso de otras estrellas, 3) la búsqueda y caracterización de planetas extrasolares por métodos fotométricos (principalmente mediante el método de tránsitos) y espectroscópico (variaciones en la velocidad
Savita
Mathur