Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

S. K. Leggett; B. Burningham; D. Saumon; M. S. Marley; S. J. Warren; H. R.A. Jones; D. J. Pinfield; R. L. Smart

doi:10.1051/epjconf/20111606007

Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

S. K. Leggett, B. Burningham, D. Saumon, M. S. Marley, S. J. Warren, H. R.A. Jones, D. J. Pinfield, R. L. Smart

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

We use Spitzer IRAC 3.6-8.0μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (T_eff)<700K emit>50% of their flux at λ>3μm, and the ratio of the mid-IR to the near-IR flux becomes very sensitive to T_eff. The color H - [4.5] is a good indicator of T_eff with a weak dependence on metallicity ([m/H]) and gravity (g) while H -K and [4.5] - [5.8] are sensitive to [m/H] and g. Thus T_eff and g can be constrained and mass and age can then be determined from evolutionary models. There are 12 dwarfs known with H - [4.5] > 3.0 and 500 T_effK 800, which we examine in detail. The ages of these dwarfs range from very young (0.1-1.0Gyr) to old (3-12Gyr). The mass range is possibly as low as 5 M_Jup to 70 M_Jup, and [m/H] also spans a large range of ∼ -0.3 to ∼ +0.3. The T8-T9 dwarfs found so far in the UKIRT IR Deep Sky Survey are unexpectedly young and low-mass. Extensions to the warm Spitzer and WISE space missions are needed to obtain mid-IR data for cold brown dwarfs, and to discover more of these rare objects.

Original language	English (US)
Title of host publication	Research, Science and Technology of Brown Dwarfs and Exoplanets
Subtitle of host publication	Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun
Editors	Weipeng Lin, Eduardo L. Martin, Eduardo L. Martin, Jian Ge
Publisher	EDP Sciences
ISBN (Electronic)	9782759806645
DOIs	https://doi.org/10.1051/epjconf/20111606007
State	Published - Jul 18 2011
Externally published	Yes
Event	International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun - Shanghai, China Duration: Jul 20 2009 → Jul 24 2009

Publication series

Name	EPJ Web of Conferences
Volume	16
ISSN (Print)	2101-6275
ISSN (Electronic)	2100-014X

Other

Other	International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun
Country/Territory	China
City	Shanghai
Period	7/20/09 → 7/24/09

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1051/epjconf/20111606007

Cite this

Leggett, S. K., Burningham, B., Saumon, D., Marley, M. S., Warren, S. J., Jones, H. R. A., Pinfield, D. J., & Smart, R. L. (2011). Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity. In W. Lin, E. L. Martin, E. L. Martin, & J. Ge (Eds.), Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun Article 06007 (EPJ Web of Conferences; Vol. 16). EDP Sciences. https://doi.org/10.1051/epjconf/20111606007

Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity. / Leggett, S. K.; Burningham, B.; Saumon, D. et al.
Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun. ed. / Weipeng Lin; Eduardo L. Martin; Eduardo L. Martin; Jian Ge. EDP Sciences, 2011. 06007 (EPJ Web of Conferences; Vol. 16).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Leggett, SK, Burningham, B, Saumon, D, Marley, MS, Warren, SJ, Jones, HRA, Pinfield, DJ & Smart, RL 2011, Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity. in W Lin, EL Martin, EL Martin & J Ge (eds), Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun., 06007, EPJ Web of Conferences, vol. 16, EDP Sciences, International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun, Shanghai, China, 7/20/09. https://doi.org/10.1051/epjconf/20111606007

Leggett SK, Burningham B, Saumon D, Marley MS, Warren SJ, Jones HRA et al. Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity. In Lin W, Martin EL, Martin EL, Ge J, editors, Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun. EDP Sciences. 2011. 06007. (EPJ Web of Conferences). doi: 10.1051/epjconf/20111606007

Leggett, S. K. ; Burningham, B. ; Saumon, D. et al. / Mid-infrared followup of cold brown dwarfs : Diversity in age, mass and metallicity. Research, Science and Technology of Brown Dwarfs and Exoplanets: Proceedings of an International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun. editor / Weipeng Lin ; Eduardo L. Martin ; Eduardo L. Martin ; Jian Ge. EDP Sciences, 2011. (EPJ Web of Conferences).

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title = "Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity",

abstract = "We use Spitzer IRAC 3.6-8.0μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (Teff)<700K emit>50% of their flux at λ>3μm, and the ratio of the mid-IR to the near-IR flux becomes very sensitive to Teff. The color H - [4.5] is a good indicator of Teff with a weak dependence on metallicity ([m/H]) and gravity (g) while H -K and [4.5] - [5.8] are sensitive to [m/H] and g. Thus Teff and g can be constrained and mass and age can then be determined from evolutionary models. There are 12 dwarfs known with H - [4.5] > 3.0 and 500 TeffK 800, which we examine in detail. The ages of these dwarfs range from very young (0.1-1.0Gyr) to old (3-12Gyr). The mass range is possibly as low as 5 MJup to 70 MJup, and [m/H] also spans a large range of ∼ -0.3 to ∼ +0.3. The T8-T9 dwarfs found so far in the UKIRT IR Deep Sky Survey are unexpectedly young and low-mass. Extensions to the warm Spitzer and WISE space missions are needed to obtain mid-IR data for cold brown dwarfs, and to discover more of these rare objects.",

author = "Leggett, {S. K.} and B. Burningham and D. Saumon and Marley, {M. S.} and Warren, {S. J.} and Jones, {H. R.A.} and Pinfield, {D. J.} and Smart, {R. L.}",

note = "Publisher Copyright: {\textcopyright} Owned by the authors, published by EDP Sciences, 2011.; International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun ; Conference date: 20-07-2009 Through 24-07-2009",

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T2 - International Conference Held in Shangai on Occasion of a Total Eclipse of the Sun

AU - Leggett, S. K.

AU - Burningham, B.

AU - Saumon, D.

AU - Marley, M. S.

AU - Warren, S. J.

AU - Jones, H. R.A.

AU - Pinfield, D. J.

AU - Smart, R. L.

PY - 2011/7/18

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N2 - We use Spitzer IRAC 3.6-8.0μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (Teff)<700K emit>50% of their flux at λ>3μm, and the ratio of the mid-IR to the near-IR flux becomes very sensitive to Teff. The color H - [4.5] is a good indicator of Teff with a weak dependence on metallicity ([m/H]) and gravity (g) while H -K and [4.5] - [5.8] are sensitive to [m/H] and g. Thus Teff and g can be constrained and mass and age can then be determined from evolutionary models. There are 12 dwarfs known with H - [4.5] > 3.0 and 500 TeffK 800, which we examine in detail. The ages of these dwarfs range from very young (0.1-1.0Gyr) to old (3-12Gyr). The mass range is possibly as low as 5 MJup to 70 MJup, and [m/H] also spans a large range of ∼ -0.3 to ∼ +0.3. The T8-T9 dwarfs found so far in the UKIRT IR Deep Sky Survey are unexpectedly young and low-mass. Extensions to the warm Spitzer and WISE space missions are needed to obtain mid-IR data for cold brown dwarfs, and to discover more of these rare objects.

AB - We use Spitzer IRAC 3.6-8.0μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (Teff)<700K emit>50% of their flux at λ>3μm, and the ratio of the mid-IR to the near-IR flux becomes very sensitive to Teff. The color H - [4.5] is a good indicator of Teff with a weak dependence on metallicity ([m/H]) and gravity (g) while H -K and [4.5] - [5.8] are sensitive to [m/H] and g. Thus Teff and g can be constrained and mass and age can then be determined from evolutionary models. There are 12 dwarfs known with H - [4.5] > 3.0 and 500 TeffK 800, which we examine in detail. The ages of these dwarfs range from very young (0.1-1.0Gyr) to old (3-12Gyr). The mass range is possibly as low as 5 MJup to 70 MJup, and [m/H] also spans a large range of ∼ -0.3 to ∼ +0.3. The T8-T9 dwarfs found so far in the UKIRT IR Deep Sky Survey are unexpectedly young and low-mass. Extensions to the warm Spitzer and WISE space missions are needed to obtain mid-IR data for cold brown dwarfs, and to discover more of these rare objects.

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BT - Research, Science and Technology of Brown Dwarfs and Exoplanets

A2 - Lin, Weipeng

A2 - Martin, Eduardo L.

A2 - Ge, Jian

PB - EDP Sciences

Y2 - 20 July 2009 through 24 July 2009

ER -

Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

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