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Surface Gravities and Masses in Substellar Objects

Published online by Cambridge University Press:  30 March 2016

Subhanjoy Mohanty ,
Gibor Basri  and
Ray Jayawardhana
Subhanjoy Mohanty
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, Cambridge, MA 02138
Gibor Basri
Affiliation:
Astronomy Department, University of California, Berkeley, CA 94720
Ray Jayawardhana
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109

Abstract

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Using high-resolution optical spectra, we determine effective temperatures and gravities for a sample of very low-mass stellar and substellar PMS cluster objects. Masses and radii are then derived using known cluster distance and photometry; two of our targets seem to have planetary masses. Our results are independent of theoretical evolutionary tracks. While our results agree with the track predictions for hotter, higher mass objects, discrepancies appear for the coolest, lowest mass ones. This may be due to track uncertainties related to formation effects, and/or internal conditions, in these very young, ultra-low-mass objects.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 813 - 815
Copyright
Copyright © Astronomical Society of Pacific 2005

References

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