Stellar Rotation of T Tauri Stars in the Orion Star-forming Complex
Stassun, Keivan G.; Kounkel, Marina; Briceño, Cesar; Calvet, Nuria; Covey, Kevin; Suárez, Genaro; Fernández-Trincado, José G.; Roman-Lopes, Alexandre; Tapia, Mauricio; Hernandez, Jesus; Peña Ramírez, Karla; Manzo-Martínez, Ezequiel; Román-Zúñiga, Carlos G.; Serna, Javier; Pinzón, Giovanni; Vargas-González, J.; Gracia Batista, Maria
Mexico, United States, Chile, Colombia, Canada, United Kingdom
Abstract
We present a large-scale study of stellar rotation for T Tauri stars in the Orion star-forming complex. We use the projected rotational velocity ( $v\sin (i)$ vsin(i) ) estimations reported by the APOGEE-2 collaboration as well as individual masses and ages derived from the position of the stars in the HR diagram, considering Gaia-EDR3 parallaxes and photometry plus diverse evolutionary models. We find an empirical trend for $v\sin (i)$ vsin(i) decreasing with age for low-mass stars (0.4M ⊙ < M * < 1.2M ⊙). Our results support the existence of a mechanism linking $v\sin (i)$ vsin(i) to the presence of accreting protoplanetary disks, responsible for regulating stellar rotation on timescales of about 6 Myr, which is the timescale in which most of the T Tauri stars lose their inner disk. Our results provide important constraints to models of rotation in the early phases of evolution of young stars and their disks.