High-Resolution Infrared Spectroscopy of the Brown Dwarf Epsilon Indi Ba

TL;DR

This study presents high-resolution infrared spectra of the nearby brown dwarf Epsilon Indi Ba, deriving its physical parameters and rotational velocity through comparison with atmospheric models.

Contribution

It provides detailed spectral analysis of Epsilon Indi Ba, a nearby brown dwarf, and derives its physical parameters using high-resolution spectroscopy and atmospheric models.

Findings

Effective temperature and surface gravity determined

Projected rotational velocity measured

Spectral data obtained at R=50,000 resolution

Abstract

We report on the analysis of high-resolution infrared spectra of the newly discovered brown dwarf Epsilon Indi Ba. This is the closest known brown dwarf to the solar system, with a distance of 3.626 pc. Spectra covering the ranges of 2.308-2.317 microns and 1.553-1.559 microns were observed at a spectral resolution of R=50,000 with the Phoenix spectrometer on the Gemini South telescope. The physical paramters of effective temperature and surface gravity are derived by comparison to model spectra calculated from atmospheres computed using unified cloudy models. An accurate projected rotational velocity is also derived.