University of Hertfordshire

From the same journal

By the same authors

Multi-object and long-slit spectroscopy of very low mass brown dwarfs in the Orion Nebular Cluster

Research output: Contribution to journalArticlepeer-review

Documents

  • 907156

    Accepted author manuscript, 188 KB, PDF document

  • Takuya Suenaga
  • Motohide Tamura
  • Masayuki Kuzuhara
  • Kenshi Yanagisawa
  • Miki Ishii
  • P.W. Lucas
View graph of relations
Original languageEnglish
Article number33
Number of pages10
JournalPublications of the Astronomical Society of Japan
Volume66
Issue2
Early online date20 May 2014
DOIs
Publication statusPublished - 2014

Abstract

We present the results of an H-and K-band multi-object and long-slit spectroscopic survey of substellar mass candidates in the outer regions of the Orion Nebula Cluster. The spectra were obtained using MOIRCS on the 8.2m Subaru telescope and ISLE on the 1.88m telescope of Okayama Astrophysical Observatory. Eight out of twelve spectra show strong water absorption and we confirm that their effective temperatures are ≤3000K (spectral type ≥M6) from a chi-square fit to synthetic spectra. We plot our sources on an HR diagram overlaid with theoretical isochrones of low-mass objects and identify three new young brown dwarf candidates. One of the three new candidates is a cool object near the brown dwarf and planetary mass boundary. Based on our observations and those of previous studies, we determine the stellar (0.08

Projects

ID: 9203156