Effective temperatures of low-mass stars from H-band spectroscopy

Data: 
17/10/2019 - 14:00 - 15:00
Local: 
Auditório 2 - Prédio Principal

Effective temperatures of low-mass stars from H-band spectroscopy

 

Ricardo Lopez-Valdivia

University of Texas

 

High-resolution, near-infrared spectra will be the primary tool for finding and characterizing Earth-like planets around low-mass stars. Yet, the properties of exoplanets cannot be precisely determined without accurate and precise measurements of the host star. Spectra obtained with the Immersion Grating Infrared Spectrometer simultaneously provide diagnostics for most stellar parameters, but the first step in any analysis is the determination of the effective temperature. Here I report the calibration of high-resolution H-band spectra to accurately determine the effective temperature for stars between 4000 and 3000 K (K8–M5) using absorption line-depths of Fe I, OH, and Al I. The star sample used here contains 254 K and M stars with temperatures derived using BT-Settl synthetic spectra. We use 106 stars with precise temperatures in the literature to calibrate our method, with typical errors of about 140 K, and systematic uncertainties less than 120 K.