New young brown dwarfs in the orion molecular cloud 2/3 region

Dawn E. Peterson, S. T. Megeath, K. L. Luhman, J. L. Pipher, J. R. Stauffer, D. Barrado Y Navascués, J. C. Wilson, M. F. Skrutskie, M. J. Nelson, J. D. Smith

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Abstract

Forty new low-mass members with spectral types ranging from M4 to M9 have been confirmed in the Orion Molecular Cloud (OMC) 2/3 region. Through deep, I-, z′-, J-, H-, and K-band photometry of a 20′ × 20′ field in OMC 2/3, we selected brown dwarf candidates for follow-up spectroscopy. Low-resolution far-red and near-infrared spectra were obtained for the candidates, and 19 young brown dwarfs in the OMC 2/3 region are confirmed. They exhibit spectral types of M6.5-M9, corresponding to approximate masses of 0.075-0.015 M using the evolutionary models of Baraffe et al. At least one of these bona fide young brown dwarfs has strong Hα emission, indicating that it is actively accreting. In addition, we confirm 21 new low-mass members with spectral types of M4-M6, corresponding to approximate masses of 0.35-0.10 M in OMC 2/3. By comparing pre-main-sequence tracks to the positions of the members in the H-R diagram, we find that most of the brown dwarfs are less than 1 Myr, but find a number of low-mass stars with inferred ages greater than 3 Myr. The discrepancy in the stellar and substellar ages is due to our selection of only low-luminosity sources; however, the presence of such objects implies the presence of an age spread in the OMC 2/3 region. We discuss possible reasons for this apparent age spread.

Original languageEnglish (US)
Pages (from-to)313-332
Number of pages20
JournalAstrophysical Journal
Volume685
Issue number1
DOIs
StatePublished - Sep 20 2008

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molecular clouds
extremely high frequencies
photometry
near infrared
infrared spectra
diagram
spectroscopy
diagrams
luminosity
young
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Peterson, D. E., Megeath, S. T., Luhman, K. L., Pipher, J. L., Stauffer, J. R., Barrado Y Navascués, D., ... Smith, J. D. (2008). New young brown dwarfs in the orion molecular cloud 2/3 region. Astrophysical Journal, 685(1), 313-332. https://doi.org/10.1086/590527
Peterson, Dawn E. ; Megeath, S. T. ; Luhman, K. L. ; Pipher, J. L. ; Stauffer, J. R. ; Barrado Y Navascués, D. ; Wilson, J. C. ; Skrutskie, M. F. ; Nelson, M. J. ; Smith, J. D. / New young brown dwarfs in the orion molecular cloud 2/3 region. In: Astrophysical Journal. 2008 ; Vol. 685, No. 1. pp. 313-332.
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Peterson, DE, Megeath, ST, Luhman, KL, Pipher, JL, Stauffer, JR, Barrado Y Navascués, D, Wilson, JC, Skrutskie, MF, Nelson, MJ & Smith, JD 2008, 'New young brown dwarfs in the orion molecular cloud 2/3 region', Astrophysical Journal, vol. 685, no. 1, pp. 313-332. https://doi.org/10.1086/590527

New young brown dwarfs in the orion molecular cloud 2/3 region. / Peterson, Dawn E.; Megeath, S. T.; Luhman, K. L.; Pipher, J. L.; Stauffer, J. R.; Barrado Y Navascués, D.; Wilson, J. C.; Skrutskie, M. F.; Nelson, M. J.; Smith, J. D.

In: Astrophysical Journal, Vol. 685, No. 1, 20.09.2008, p. 313-332.

Research output: Contribution to journalArticle

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T1 - New young brown dwarfs in the orion molecular cloud 2/3 region

AU - Peterson, Dawn E.

AU - Megeath, S. T.

AU - Luhman, K. L.

AU - Pipher, J. L.

AU - Stauffer, J. R.

AU - Barrado Y Navascués, D.

AU - Wilson, J. C.

AU - Skrutskie, M. F.

AU - Nelson, M. J.

AU - Smith, J. D.

PY - 2008/9/20

Y1 - 2008/9/20

N2 - Forty new low-mass members with spectral types ranging from M4 to M9 have been confirmed in the Orion Molecular Cloud (OMC) 2/3 region. Through deep, I-, z′-, J-, H-, and K-band photometry of a 20′ × 20′ field in OMC 2/3, we selected brown dwarf candidates for follow-up spectroscopy. Low-resolution far-red and near-infrared spectra were obtained for the candidates, and 19 young brown dwarfs in the OMC 2/3 region are confirmed. They exhibit spectral types of M6.5-M9, corresponding to approximate masses of 0.075-0.015 M⊙ using the evolutionary models of Baraffe et al. At least one of these bona fide young brown dwarfs has strong Hα emission, indicating that it is actively accreting. In addition, we confirm 21 new low-mass members with spectral types of M4-M6, corresponding to approximate masses of 0.35-0.10 M⊙ in OMC 2/3. By comparing pre-main-sequence tracks to the positions of the members in the H-R diagram, we find that most of the brown dwarfs are less than 1 Myr, but find a number of low-mass stars with inferred ages greater than 3 Myr. The discrepancy in the stellar and substellar ages is due to our selection of only low-luminosity sources; however, the presence of such objects implies the presence of an age spread in the OMC 2/3 region. We discuss possible reasons for this apparent age spread.

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Peterson DE, Megeath ST, Luhman KL, Pipher JL, Stauffer JR, Barrado Y Navascués D et al. New young brown dwarfs in the orion molecular cloud 2/3 region. Astrophysical Journal. 2008 Sep 20;685(1):313-332. https://doi.org/10.1086/590527