Angular Momentum of Stars and their Planets. (10th December 2018)

• Record Type: Journal Article
• Authors: Gurumath, Shashanka R.; Hiremath, K. M.; Ramasubramanian, V.
• Is Part Of: Publications of the Astronomical Society of the Pacific. Volume 131:Number 995(2019)
• Publication Date: 2018-12-10
• Subjects: stars: evolution -- stars: fundamental parameters -- (stars:) planetary systems -- stars: solar-type; Astronomy -- Periodicals; Astronomy; Periodicals; Periodicals; 520.5
• DOI: 10.1088/1538-3873/aae6b1
• Languages: English
• ISSNs: 0004-6280

Abstract

Abstract: To understand the distribution of angular momenta between host stars and their planets, we estimate the spin angular momentum ( J spin ) of host stars that follow a power law 10 ( 42.33 ± 5.40 ) M ⋆ M ⊙ ( 4.18 ± 0.53 ) with stellar mass M ⋆ M ⊙ . Similarly, the orbital angular momenta ( L p ) of exoplanets are estimated, and the best fit yields a power law, 10 ( 42.66 ± 1.79 ) M p M J ( 1.26 ± 0.05 ), with the exoplanetary mass M p M J . Furthermore, the total (spin and orbital) angular momentum J tot of the stellar planetary system is computed, and a power law of the form J tot = 10 ( 43.11 ± 6.82 ) M p M J ( 0.94 ± 0.14 ) is obtained. In addition, an analysis between specific angular momenta ( I p ) of planets and planetary masses reveals that specific angular momentum is nonlinearly related with planetary mass in case of multiplanetary systems and is independent of planetary mass in case of single-planetary systems. We find that the probability of detecting Earth-like planets is more likely for host stars that have total angular momentum ≤10 41 kg m 2 s −1 . Finally, a power-law relationship is obtained between exoplanetary masses and their orbital distances in case of multiplanetary systems and, is independent in case of single-planetary systems.