Very low mass objects in Orion ob1a and b

Frederick M. Walter; Jacqueline K. Faherty; William H. Sherry; Sean Brittain

doi:10.1063/1.3099176

Very low mass objects in Orion ob1a and b

Frederick M. Walter
, Jacqueline K. Faherty
, William H. Sherry
, Sean Brittain

Physics and Astronomy

Stony Brook University
NOAO
Clemson University

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present initial results of a search for the substellar mass population of the Orion OB l a and b associations, based on a deep optical/near-IR survey. We are complete to about 1 magnitude fainter than the 2MASS survey at K. Global comparison of the K vs. J - K color-magnitude diagram shows an excess of objects with K > 14.4 (the substellar limit in Orion OB lb) and 0.8 < J - K> 1.0. The BVRIJHK spectral energy distributions are consistent with unreddened 2 Myr old substellar mass objects at the distance of Orion OB lb. Near-IR spectra confirm spectral types near M7, and show the triangular H-band continuum shape associated with young (low gravity) objects. Space densities of these objects exceed a few hundred/deg² near θ Orionis.

Original language	English
Pages (from-to)	568-571
Number of pages	4
Journal	AIP Conference Proceedings
Volume	1094
DOIs	https://doi.org/10.1063/1.3099176
State	Published - 2009
Event	15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - St. Andrews, United Kingdom Duration: Jul 21 2008 → Jul 25 2008

Keywords

Brown dwarfs
Formation
Low mass

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10.1063/1.3099176

Cite this

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title = "Very low mass objects in Orion ob1a and b",

abstract = "We present initial results of a search for the substellar mass population of the Orion OB l a and b associations, based on a deep optical/near-IR survey. We are complete to about 1 magnitude fainter than the 2MASS survey at K. Global comparison of the K vs. J - K color-magnitude diagram shows an excess of objects with K > 14.4 (the substellar limit in Orion OB lb) and 0.8 < J - K> 1.0. The BVRIJHK spectral energy distributions are consistent with unreddened 2 Myr old substellar mass objects at the distance of Orion OB lb. Near-IR spectra confirm spectral types near M7, and show the triangular H-band continuum shape associated with young (low gravity) objects. Space densities of these objects exceed a few hundred/deg2 near θ Orionis.",

keywords = "Brown dwarfs, Formation, Low mass",

author = "Walter, \{Frederick M.\} and Faherty, \{Jacqueline K.\} and Sherry, \{William H.\} and Sean Brittain",

year = "2009",

doi = "10.1063/1.3099176",

language = "English",

volume = "1094",

pages = "568--571",

journal = "AIP Conference Proceedings",

issn = "0094-243X",

note = "15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun ; Conference date: 21-07-2008 Through 25-07-2008",

}

TY - JOUR

T1 - Very low mass objects in Orion ob1a and b

AU - Walter, Frederick M.

AU - Faherty, Jacqueline K.

AU - Sherry, William H.

AU - Brittain, Sean

PY - 2009

Y1 - 2009

N2 - We present initial results of a search for the substellar mass population of the Orion OB l a and b associations, based on a deep optical/near-IR survey. We are complete to about 1 magnitude fainter than the 2MASS survey at K. Global comparison of the K vs. J - K color-magnitude diagram shows an excess of objects with K > 14.4 (the substellar limit in Orion OB lb) and 0.8 < J - K> 1.0. The BVRIJHK spectral energy distributions are consistent with unreddened 2 Myr old substellar mass objects at the distance of Orion OB lb. Near-IR spectra confirm spectral types near M7, and show the triangular H-band continuum shape associated with young (low gravity) objects. Space densities of these objects exceed a few hundred/deg2 near θ Orionis.

AB - We present initial results of a search for the substellar mass population of the Orion OB l a and b associations, based on a deep optical/near-IR survey. We are complete to about 1 magnitude fainter than the 2MASS survey at K. Global comparison of the K vs. J - K color-magnitude diagram shows an excess of objects with K > 14.4 (the substellar limit in Orion OB lb) and 0.8 < J - K> 1.0. The BVRIJHK spectral energy distributions are consistent with unreddened 2 Myr old substellar mass objects at the distance of Orion OB lb. Near-IR spectra confirm spectral types near M7, and show the triangular H-band continuum shape associated with young (low gravity) objects. Space densities of these objects exceed a few hundred/deg2 near θ Orionis.

KW - Brown dwarfs

KW - Formation

KW - Low mass

UR - https://www.scopus.com/pages/publications/64849110466

U2 - 10.1063/1.3099176

DO - 10.1063/1.3099176

M3 - Conference article

AN - SCOPUS:64849110466

SN - 0094-243X

VL - 1094

SP - 568

EP - 571

JO - AIP Conference Proceedings

JF - AIP Conference Proceedings

T2 - 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun

Y2 - 21 July 2008 through 25 July 2008

ER -

Very low mass objects in Orion ob1a and b

Abstract

Keywords

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