SIMBAD references

2017ApJ...838L..11M - Astrophys. J., 838, L11-L11 (2017/March-3)

Mass, density, and formation constraints in the compact, sub-Earth Kepler-444 system including two Mars-mass planets.


Abstract (from CDS):

Kepler-444 is a five-planet system around a host star approximately 11 billion years old. The five transiting planets all have sub-Earth radii and are in a compact configuration with orbital periods between 3 and 10 days. Here, we present a transit-timing analysis of the system using the full Kepler data set in order to determine the masses of the planets. Two planets, Kepler-444 d (Md=0.036–0.020+0.065 M) and Kepler-444 e (Me=0.034–0.019+0.059 M), have confidently detected masses due to their proximity to resonance that creates transit-timing variations. The mass ratio of these planets combined with the magnitude of possible star-planet tidal effects suggests that smooth disk migration over a significant distance is unlikely to have brought the system to its currently observed orbital architecture without significant post-formation perturbations.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): planets and satellites: composition - planets and satellites: individual Kepler-444 - planets and satellites: terrestrial planets - planets and satellites: terrestrial planets

Simbad objects: 6

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