A Mini-Neptune and a Venus-Zone Planet in the Radius Valley Orbiting the Nearby M2-dwarf TOI-1266: Validation with the Habitable-zone Planet Finder
arXiv:2006.11180
Abstract
We report on the validation of two planets orbiting the nearby (36pc) M2 dwarf TOI-1266 observed by the TESS mission. The inner planet is sub-Neptune-sized () with an orbital period of 10.9 days. The outer planet has a radius of and resides in the exoplanet Radius Valley---the transition region between rocky and gaseous planets. With an orbital period of 18.8 days, the outer planet receives an insolation flux of 2.4 times that of Earth, similar to the insolation of Venus. Using precision near-infrared radial velocities with the Habitable-zone Planet Finder Spectrograph, we place upper mass limits of and at 95% confidence for the inner and outer planet, respectively. A more precise mass constraint of planet c, achievable with current RV instruments given the host star brightness (V=12.9, J=9.7), will yield further insights into the dominant processes sculpting the exoplanet Radius Valley.
arXiv commentSubmitted to AAS Journals. 21 pages, 8 figures. Comments welcome
References in corpus (7)
- The Transiting Exoplanet Survey Satellite
- dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
- Juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
- Super-Earth masses sculpted by pebble isolation around stars of different masses
- Mass-Radius relationship for M dwarf exoplanets: Comparing nonparametric and parametric methods
- TOI-1235 b: a keystone super-Earth for testing radius valley emergence models around early M dwarfs
- Radial Velocity Prospects Current and Future: A White Paper Report prepared by the Study Analysis Group 8 for the Exoplanet Program Analysis Group (ExoPAG)