Subaru IR Spectroscopy of Candidate Young Brown Dwarfs and Planetary-Mass Objects in IC 348

Details Subaru IR Spectroscopy of Candidate Young Brown Dwarfs and Planetary-Mass Objects in IC 348 Subaru IR Spectroscopy of Candidate Young Brown Dwarfs and Planetary-Mass Objects in IC 348

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..141l&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars , Stellar Systems, and the Sun (2001 July 30 - Augus

Astronomy and Astrophysics

Astrophysics

Ic 348, Brown Dwarfs, Planetary-Mass Objects, Ir Spectral Classification, Q Index, Young Clusters

Scientific paper

We present preliminary results for candidate substellar objects in the young cluster IC 348 observed with the IRCS spectrograph on the Subaru 8.2-m Telescope. Our sample has been selected from a novel HST NICMOS narrow-band imaging survey tuned to the 1.9 micron water absorption in cool stars; the sample is unique in that it is complete down to the fiducial boundary between brown dwarfs and planets. It contains many potential free-floating planetary mass objects. We have obtained K-band spectra of the very coolest candidates in order to measure their spectral types, and hence obtain mass estimates. Since objects in young clusters are differentially extincted, we discuss methods of determining spectral types from reddening independent indices, analogous to the narrow-band HST imaging originally used to find the candidates. We demonstrate such techniques can be applied to ground-based spectra across the entire range of M and L-type atmospheres. Preliminary results from this work suggest the spectroscopic sample contains both background stars and cluster members of very low mass.

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