SIMBAD references

2016MNRAS.460.3706R - Mon. Not. R. Astron. Soc., 460, 3706-3719 (2016/August-3)

The conjectured S-type retrograde planet in ν Octantis: more evidence including four years of iodine-cell radial velocities.

RAMM D.J., NELSON B.E., ENDL M., HEARNSHAW J.B., WITTENMYER R.A., GUNN F., BERGMANN C., KILMARTIN P. and BROGT E.

Abstract (from CDS):

We report 1212 radial-velocity (RV) measurements obtained in the years 2009-2013 using an iodine cell for the spectroscopic binary ν Octantis (K1 III/IV). This system (a_\scriptscriptstyle bin ∼2.6 au, P ∼ 1050 d) is conjectured to have a Jovian planet with a semimajor axis half that of the binary host. The extreme geometry only permits long-term stability if the planet is in a retrograde orbit. Whilst the reality of the planet (P ∼ 415 d) remains uncertain, other scenarios (stellar variability or apsidal motion caused by a yet unobserved third star) continue to appear substantially less credible based on cross-correlation function bisectors, line-depth ratios and many other independent details. If this evidence is validated but the planet is disproved, the claims of other planets using RVs will be seriously challenged. We also describe a significant revision to the previously published RVs and the full set of 1437 RVs now encompasses nearly 13 yr. The sensitive orbital dynamics allow us to constrain the 3D architecture with a broad prior probability distribution on the mutual inclination, which with posterior samples obtained from an N-body Markov chain Monte Carlo is found to be 152{.}5±^{0.7}_{0.6}. None of these samples are dynamically stable beyond 10^6 yr. However, a grid search around the best-fitting solution finds a region that has many models stable for 10^7 yr, and includes one model within 1σ that is stable for at least 10^8 yr. The planet's exceptional nature demands robust independent verification and makes the theoretical understanding of its formation a worthy challenge.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: radial velocities - planets and satellites: dynamical evolution and stability - binaries: spectroscopic - stars: individual: ν Octantis - stars: individual: ν Octantis

VizieR on-line data: <Available at CDS (J/MNRAS/460/3706): table3.dat table4.dat table5.dat>

Status in Simbad:  will not be processed

Simbad objects: 20

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2016MNRAS.460.3706R and select 'bookmark this link' or equivalent in the popup menu


2019.10.23-08:21:04

© Université de Strasbourg/CNRS

    • Contact