Characterization of M, L, and T dwarfs in the sloan digital sky survey

Suzanne L. Hawley, Kevin R. Covey, Gillian R. Knapp, David A. Golmowski, Xiaohui Fan, Scott F. Anderson, James E. Gunn, Hugh C. Harris, Zeljko Ivezić, Gary M. Long, Robert H. Lupton, Peregrine M. McGehee, Vijay Narayanan, Eric Peng, David Schlegel, Donald P. Schneider, Emily Y. Spahn, Michael A. Strauss, Paula Szkody, Zlatan Tsvetanov & 12 others Lucianne M. Walkowicz, J. Brinkmann, Michael Harvanek, Gregory S. Hennessy, S. J. Kleinman, Jurek Krzesinski, Dan Long, Eric H. Neilsen, Peter R. Newman, Atsuko Nitta, Stephanie A. Snedden, Donald G. York

Research output: Contribution to journalArticle

295 Citations (Scopus)

Abstract

An extensive sample of M, L, and T dwarfs identified in the Sloan Digital Sky Survey (SDSS) has been compiled. The sample of 718 dwarfs includes 677 new objects (629 M dwarfs and 48 L dwarfs), together with 41 that have been previously published. All new objects and some of the previously published ones have new optical spectra obtained either with the SDSS spectrographs or with the Apache Point Observatory 3.5 m ARC telescope. Spectral types and SDSS colors are available for all objects; approximately 35% also have near-infrared magnitudes measured by 2MASS (Two Micron All Sky Survey) or on the Mauna Kea system. We use this sample to characterize the color-spectral type and color-color relations of late-type dwarfs in the SDSS filters and to derive spectroscopic and photometric parallax relations for use in future studies of the luminosity and mass functions based on SDSS data. We find that the i*-z* and i*-J colors provide good spectral type and absolute magnitude (Mi*) estimates for M and L dwarfs. Our distance estimates for the current sample indicate that SDSS is finding early M dwarfs out to ∼1.5 kpc, L dwarfs to ∼100 pc, and T dwarfs to ∼20 pc. The T dwarf photometric data show large scatter and are therefore less reliable for spectral type and distance estimation.

Original languageEnglish (US)
Pages (from-to)3409-3427
Number of pages19
JournalAstronomical Journal
Volume123
Issue number6 1758
DOIs
StatePublished - Jun 2002
Externally publishedYes

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color
parallax
estimates
spectrographs
optical spectrum
near infrared
observatories
observatory
luminosity
telescopes
filter
filters

Keywords

  • Stars: late-type
  • Stars: low-mass, brown dwarfs
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hawley, S. L., Covey, K. R., Knapp, G. R., Golmowski, D. A., Fan, X., Anderson, S. F., ... York, D. G. (2002). Characterization of M, L, and T dwarfs in the sloan digital sky survey. Astronomical Journal, 123(6 1758), 3409-3427. https://doi.org/10.1086/340697

Characterization of M, L, and T dwarfs in the sloan digital sky survey. / Hawley, Suzanne L.; Covey, Kevin R.; Knapp, Gillian R.; Golmowski, David A.; Fan, Xiaohui; Anderson, Scott F.; Gunn, James E.; Harris, Hugh C.; Ivezić, Zeljko; Long, Gary M.; Lupton, Robert H.; McGehee, Peregrine M.; Narayanan, Vijay; Peng, Eric; Schlegel, David; Schneider, Donald P.; Spahn, Emily Y.; Strauss, Michael A.; Szkody, Paula; Tsvetanov, Zlatan; Walkowicz, Lucianne M.; Brinkmann, J.; Harvanek, Michael; Hennessy, Gregory S.; Kleinman, S. J.; Krzesinski, Jurek; Long, Dan; Neilsen, Eric H.; Newman, Peter R.; Nitta, Atsuko; Snedden, Stephanie A.; York, Donald G.

In: Astronomical Journal, Vol. 123, No. 6 1758, 06.2002, p. 3409-3427.

Research output: Contribution to journalArticle

Hawley, SL, Covey, KR, Knapp, GR, Golmowski, DA, Fan, X, Anderson, SF, Gunn, JE, Harris, HC, Ivezić, Z, Long, GM, Lupton, RH, McGehee, PM, Narayanan, V, Peng, E, Schlegel, D, Schneider, DP, Spahn, EY, Strauss, MA, Szkody, P, Tsvetanov, Z, Walkowicz, LM, Brinkmann, J, Harvanek, M, Hennessy, GS, Kleinman, SJ, Krzesinski, J, Long, D, Neilsen, EH, Newman, PR, Nitta, A, Snedden, SA & York, DG 2002, 'Characterization of M, L, and T dwarfs in the sloan digital sky survey', Astronomical Journal, vol. 123, no. 6 1758, pp. 3409-3427. https://doi.org/10.1086/340697
Hawley SL, Covey KR, Knapp GR, Golmowski DA, Fan X, Anderson SF et al. Characterization of M, L, and T dwarfs in the sloan digital sky survey. Astronomical Journal. 2002 Jun;123(6 1758):3409-3427. https://doi.org/10.1086/340697
Hawley, Suzanne L. ; Covey, Kevin R. ; Knapp, Gillian R. ; Golmowski, David A. ; Fan, Xiaohui ; Anderson, Scott F. ; Gunn, James E. ; Harris, Hugh C. ; Ivezić, Zeljko ; Long, Gary M. ; Lupton, Robert H. ; McGehee, Peregrine M. ; Narayanan, Vijay ; Peng, Eric ; Schlegel, David ; Schneider, Donald P. ; Spahn, Emily Y. ; Strauss, Michael A. ; Szkody, Paula ; Tsvetanov, Zlatan ; Walkowicz, Lucianne M. ; Brinkmann, J. ; Harvanek, Michael ; Hennessy, Gregory S. ; Kleinman, S. J. ; Krzesinski, Jurek ; Long, Dan ; Neilsen, Eric H. ; Newman, Peter R. ; Nitta, Atsuko ; Snedden, Stephanie A. ; York, Donald G. / Characterization of M, L, and T dwarfs in the sloan digital sky survey. In: Astronomical Journal. 2002 ; Vol. 123, No. 6 1758. pp. 3409-3427.
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T1 - Characterization of M, L, and T dwarfs in the sloan digital sky survey

AU - Hawley, Suzanne L.

AU - Covey, Kevin R.

AU - Knapp, Gillian R.

AU - Golmowski, David A.

AU - Fan, Xiaohui

AU - Anderson, Scott F.

AU - Gunn, James E.

AU - Harris, Hugh C.

AU - Ivezić, Zeljko

AU - Long, Gary M.

AU - Lupton, Robert H.

AU - McGehee, Peregrine M.

AU - Narayanan, Vijay

AU - Peng, Eric

AU - Schlegel, David

AU - Schneider, Donald P.

AU - Spahn, Emily Y.

AU - Strauss, Michael A.

AU - Szkody, Paula

AU - Tsvetanov, Zlatan

AU - Walkowicz, Lucianne M.

AU - Brinkmann, J.

AU - Harvanek, Michael

AU - Hennessy, Gregory S.

AU - Kleinman, S. J.

AU - Krzesinski, Jurek

AU - Long, Dan

AU - Neilsen, Eric H.

AU - Newman, Peter R.

AU - Nitta, Atsuko

AU - Snedden, Stephanie A.

AU - York, Donald G.

PY - 2002/6

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N2 - An extensive sample of M, L, and T dwarfs identified in the Sloan Digital Sky Survey (SDSS) has been compiled. The sample of 718 dwarfs includes 677 new objects (629 M dwarfs and 48 L dwarfs), together with 41 that have been previously published. All new objects and some of the previously published ones have new optical spectra obtained either with the SDSS spectrographs or with the Apache Point Observatory 3.5 m ARC telescope. Spectral types and SDSS colors are available for all objects; approximately 35% also have near-infrared magnitudes measured by 2MASS (Two Micron All Sky Survey) or on the Mauna Kea system. We use this sample to characterize the color-spectral type and color-color relations of late-type dwarfs in the SDSS filters and to derive spectroscopic and photometric parallax relations for use in future studies of the luminosity and mass functions based on SDSS data. We find that the i*-z* and i*-J colors provide good spectral type and absolute magnitude (Mi*) estimates for M and L dwarfs. Our distance estimates for the current sample indicate that SDSS is finding early M dwarfs out to ∼1.5 kpc, L dwarfs to ∼100 pc, and T dwarfs to ∼20 pc. The T dwarf photometric data show large scatter and are therefore less reliable for spectral type and distance estimation.

AB - An extensive sample of M, L, and T dwarfs identified in the Sloan Digital Sky Survey (SDSS) has been compiled. The sample of 718 dwarfs includes 677 new objects (629 M dwarfs and 48 L dwarfs), together with 41 that have been previously published. All new objects and some of the previously published ones have new optical spectra obtained either with the SDSS spectrographs or with the Apache Point Observatory 3.5 m ARC telescope. Spectral types and SDSS colors are available for all objects; approximately 35% also have near-infrared magnitudes measured by 2MASS (Two Micron All Sky Survey) or on the Mauna Kea system. We use this sample to characterize the color-spectral type and color-color relations of late-type dwarfs in the SDSS filters and to derive spectroscopic and photometric parallax relations for use in future studies of the luminosity and mass functions based on SDSS data. We find that the i*-z* and i*-J colors provide good spectral type and absolute magnitude (Mi*) estimates for M and L dwarfs. Our distance estimates for the current sample indicate that SDSS is finding early M dwarfs out to ∼1.5 kpc, L dwarfs to ∼100 pc, and T dwarfs to ∼20 pc. The T dwarf photometric data show large scatter and are therefore less reliable for spectral type and distance estimation.

KW - Stars: late-type

KW - Stars: low-mass, brown dwarfs

KW - Surveys

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