2012/06/02 by T. Sasaki, Takashi Sasaki, Jason W. Barnes +2 · 84 citations
Physics and Astronomy · #Astro and Planetary Science #Astrobiology #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Exoplanet #Geology #Neptune #Physics #Planet #Planetary system #Stellar, planetary, and galactic studies #Terrestrial planet #Tidal acceleration #Tidal locking #astro-ph.EP
paper · pdf · doi:10.1088/0004-637x/754/1/51
published in The Astrophysical Journal 754(1), 51 (IOP Publishing) · Accepted for publication in ApJ, 19 pages, 19 figures
arxiv created 2012/06/02 · openalex publication_date 2012/07/05 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We formulated tidal decay lifetimes for hypothetical moons orbiting extrasolar planets with both lunar and stellar tides. Previous works neglected the effect of lunar tides on planet rotation, and are therefore applicable only to systems in which the moon's mass is much less than that of the planet. This work, in contrast, can be applied to the relatively large moons that might be detected around newly discovered Neptune-mass and super-Earth planets. We conclude that moons are more stable when the planet/moon systems are further from the parent star, the planets are heavier, or the parent stars are lighter. Inclusion of lunar tides allows for significantly longer lifetimes for a massive moon relative to prior formulations. We expect that the semimajor axis of the planet hosting the first detected exomoon around a G-type star is 0.4–0.6 AU and is 0.2–0.4 AU for an M-type star.