A New Gas Cell for High-precision Doppler Measurements in the Near-infrared

Valdivielso, L.; Esparza, P.; Martín, E. L.; Maukonen, D.; Peale, R. E.
Referencia bibliográfica

The Astrophysical Journal, Volume 715, Issue 2, pp. 1366-1369 (2010).

Fecha de publicación:
6
2010
Número de autores
5
Número de autores del IAC
1
Número de citas
11
Número de citas referidas
6
Descripción
High-resolution spectroscopy in the near-infrared could become the leading method for discovering extra-solar planets around very low mass stars and brown dwarfs. In order to help to achieve an accuracy of ~m s-1, we are developing a gas cell which consists of a mixture of gases whose absorption spectral lines span all over the near-infrared region. We present the most promising mixture, made of acetylene, nitrous oxide, ammonia, chloromethanes, and hydrocarbons. The mixture is contained in a small size 13 cm long gas cell and covers most of the H and K bands. It also shows small absorptions in the J band, but they are few and not sharp enough for near-infrared wavelength calibration. We describe the working method and experiments, and compare our results with the state of the art for near-infrared gas cells.