Examining the rotation of the planet-hosting M dwarf GJ 3942

Autor:	Fonseca, Andrew, Dodson-Robinson, Sarah
Rok vydání:	2024
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Earth and Planetary Astrophysics
Druh dokumentu:	Working Paper
Popis:	Based on radial velocities, EXORAP photometry, and activity indicators, the HADES team reported a 16.3-day rotation period for the M dwarf GJ 3992. However, an RV--H$\alpha$ magnitude-squared coherence estimate has significant peaks at frequencies 1/16 cycles/day and 1/32 cycles/day. We re-analyze HADES data plus Hipparcos, SuperWASP, and TESS photometry to see whether the rotation period could be 32 days with 16-day harmonic. SuperWASP shows no significant periodicities, while the Hipparcos observing cadence is suboptimal for detecting 16- and 32-day periodicities. Although the average TESS periodogram has peaks at harmonics of 1/16 cycles/day, the harmonic sequence is not fully resolved according to the Rayleigh criterion. The TESS observations suggest a 1/16 cycles/day rotation frequency and a 1/32 cycles/day subharmonic, though resolution makes the TESS rotation detection ambiguous. Comment: 5 pages, 1 figure, submitted to RNAAS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2411.05476 Zobrazit plný text záznamu View this record from Arxiv