SIMBAD references

2003ApJ...593L.113M - Astrophys. J., 593, L113-L116 (2003/August-3)

Spectroscopic estimate of surface gravity for a planetary member in the σ Orionis cluster.


Abstract (from CDS):

We present intermediate-resolution (R=1500) near-infrared spectroscopy from 1.17 to 1.37 µm of the spectral type T planetary candidate member in the σ Orionis cluster S Ori 70 reported by Zapatero Osorio et al. The new data have been obtained with NIRSPEC at the Keck II telescope. The best fit of our mid-resolution spectrum of S Ori 70 with theoretical spectra gives logg=3.5±0.5 cm.s–2 and Teff=1100+200–100K. The low gravity of this object derived from spectral synthesis supports its youth and membership to the young σ Orionis cluster. Using evolutionary models for an age of 3 Myr, we obtain a mass of 3 MJupand a radius of 0.16 R, independent of the distance to the object. Our analysis confirms that S Ori 70 is the lowest mass cluster planet so far identified in the galaxy.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: σ Orionis - Stars: Planetary Systems: Formation - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Luminosity Function, Mass Function - Techniques: Spectroscopic

CDS comments: Parag. 2 : 2MASS J0559191-140449 is 2MASSI J0559191-140448

Simbad objects: 8

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