The Age of the KIC 7177553 System
arXiv:1609.00942 · doi:10.3847/1538-4357/834/2/99
Abstract
KIC 7177553 is a quadruple system containing two binaries of orbital periods 16.5 and 18 d. All components have comparable masses and are slowly rotating, non-evolved stars of spectral type near G2V. The longer period binary is eclipsing with component masses and radii, M1 = 1.043 +/- 0.014 M_sun, R1 = 0.940 +/- 0.005 R_sun, and M2 = 0.986 +/- 0.015 M_sun, R2 = 0.941 +/- 0.005 R_sun. The essentially equal radii measurements are inconsistent with the two stars being on the main sequence at the same age using standard stellar evolution models. Instead a consistent scenario is found if the stars are in their pre-main sequence phase of evolution and have age 33 - 36 Myr. Such a young age has important implications for the detectability of the massive planet indicated by eclipse time variations.
References in corpus (6)
- Direct Imaging of Multiple Planets Orbiting the Star HR 8799
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- Helioseismology and Solar Abundances
- A Bitter Pill: The Primordial Lithium Problem Worsens
- Determining solar abundances using helioseismology
- Apparent Non-Coevality among the Stars in Upper Scorpio: Resolving the Problem using a Model of Magnetic Inhibition of Convection