Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs

Elisabeth R. Newton, David Charbonneau, Jonathan Irwin, Zachory K. Berta-Thompson, Barbara Rojas-Ayala, Kevin Covey, James P. Lloyd

Resultado de la investigación: Article

91 Citas (Scopus)

Resumen

We present metallicities, radial velocities, and near-infrared (NIR) spectral types for 447 M dwarfs determined from moderate resolution (R ≈ 2000) NIR spectra obtained with the NASA Infrared Telescope Facility (IRTF)/SpeX. These M dwarfs are primarily targets of the MEarth Survey, a transiting planet survey searching for super Earths around mid-to-late M dwarfs within 33 pc. We present NIR spectral types for each star and new spectral templates for the IRTF in the Y, J, H, and K-bands, created using M dwarfs with near-solar metallicities. We developed two spectroscopic distance calibrations that use NIR spectral type or an index based on the curvature of the K-band continuum. Our distance calibration has a scatter of 14%. We searched 27 NIR spectral lines and 10 spectral indices for metallicity sensitive features, taking into account correlated noise in our estimates of the errors on these parameters. We calibrated our relation using 36 M dwarfs in common proper pairs with an F-, G-, or K-type star of known metallicity. We validated the physical association of these pairs using proper motions, radial velocities, and spectroscopic distance estimates. Our resulting metallicity calibration uses the sodium doublet at 2.2 μm as the sole indicator for metallicity. It has an accuracy of 0.12 dex inferred from the scatter between the metallicities of the primaries and the estimated metallicities of the secondaries. Our relation is valid for NIR spectral types from M1V to M5V and for -1.0 dex < [Fe/H] < +0.35 dex. We present a new color-color metallicity relation using J-H and J-K colors that directly relates two observables: the distance from the M dwarf main sequence and equivalent width of the sodium line at 2.2 μm. We used radial velocities of M dwarf binaries, observations at different epochs, and comparison between our measurements and precisely measured radial velocities to demonstrate a 4 km s-1 accuracy.

Idioma originalEnglish
Número de artículo20
PublicaciónAstronomical Journal
Volumen147
N.º1
DOI
EstadoPublished - 1 ene 2014

Huella dactilar

radial velocity
metallicity
near infrared
calibration
infrared telescopes
sodium
extremely high frequencies
color
curvature
stars
planet
proper motion
estimates
line spectra
planets
infrared spectra
templates
time measurement
continuums
index

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Newton, E. R., Charbonneau, D., Irwin, J., Berta-Thompson, Z. K., Rojas-Ayala, B., Covey, K., & Lloyd, J. P. (2014). Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs. Astronomical Journal, 147(1), [20]. https://doi.org/10.1088/0004-6256/147/1/20
Newton, Elisabeth R. ; Charbonneau, David ; Irwin, Jonathan ; Berta-Thompson, Zachory K. ; Rojas-Ayala, Barbara ; Covey, Kevin ; Lloyd, James P. / Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs. En: Astronomical Journal. 2014 ; Vol. 147, N.º 1.
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abstract = "We present metallicities, radial velocities, and near-infrared (NIR) spectral types for 447 M dwarfs determined from moderate resolution (R ≈ 2000) NIR spectra obtained with the NASA Infrared Telescope Facility (IRTF)/SpeX. These M dwarfs are primarily targets of the MEarth Survey, a transiting planet survey searching for super Earths around mid-to-late M dwarfs within 33 pc. We present NIR spectral types for each star and new spectral templates for the IRTF in the Y, J, H, and K-bands, created using M dwarfs with near-solar metallicities. We developed two spectroscopic distance calibrations that use NIR spectral type or an index based on the curvature of the K-band continuum. Our distance calibration has a scatter of 14{\%}. We searched 27 NIR spectral lines and 10 spectral indices for metallicity sensitive features, taking into account correlated noise in our estimates of the errors on these parameters. We calibrated our relation using 36 M dwarfs in common proper pairs with an F-, G-, or K-type star of known metallicity. We validated the physical association of these pairs using proper motions, radial velocities, and spectroscopic distance estimates. Our resulting metallicity calibration uses the sodium doublet at 2.2 μm as the sole indicator for metallicity. It has an accuracy of 0.12 dex inferred from the scatter between the metallicities of the primaries and the estimated metallicities of the secondaries. Our relation is valid for NIR spectral types from M1V to M5V and for -1.0 dex < [Fe/H] < +0.35 dex. We present a new color-color metallicity relation using J-H and J-K colors that directly relates two observables: the distance from the M dwarf main sequence and equivalent width of the sodium line at 2.2 μm. We used radial velocities of M dwarf binaries, observations at different epochs, and comparison between our measurements and precisely measured radial velocities to demonstrate a 4 km s-1 accuracy.",
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Newton, ER, Charbonneau, D, Irwin, J, Berta-Thompson, ZK, Rojas-Ayala, B, Covey, K & Lloyd, JP 2014, 'Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs', Astronomical Journal, vol. 147, n.º 1, 20. https://doi.org/10.1088/0004-6256/147/1/20

Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs. / Newton, Elisabeth R.; Charbonneau, David; Irwin, Jonathan; Berta-Thompson, Zachory K.; Rojas-Ayala, Barbara; Covey, Kevin; Lloyd, James P.

En: Astronomical Journal, Vol. 147, N.º 1, 20, 01.01.2014.

Resultado de la investigación: Article

TY - JOUR

T1 - Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs

AU - Newton, Elisabeth R.

AU - Charbonneau, David

AU - Irwin, Jonathan

AU - Berta-Thompson, Zachory K.

AU - Rojas-Ayala, Barbara

AU - Covey, Kevin

AU - Lloyd, James P.

PY - 2014/1/1

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N2 - We present metallicities, radial velocities, and near-infrared (NIR) spectral types for 447 M dwarfs determined from moderate resolution (R ≈ 2000) NIR spectra obtained with the NASA Infrared Telescope Facility (IRTF)/SpeX. These M dwarfs are primarily targets of the MEarth Survey, a transiting planet survey searching for super Earths around mid-to-late M dwarfs within 33 pc. We present NIR spectral types for each star and new spectral templates for the IRTF in the Y, J, H, and K-bands, created using M dwarfs with near-solar metallicities. We developed two spectroscopic distance calibrations that use NIR spectral type or an index based on the curvature of the K-band continuum. Our distance calibration has a scatter of 14%. We searched 27 NIR spectral lines and 10 spectral indices for metallicity sensitive features, taking into account correlated noise in our estimates of the errors on these parameters. We calibrated our relation using 36 M dwarfs in common proper pairs with an F-, G-, or K-type star of known metallicity. We validated the physical association of these pairs using proper motions, radial velocities, and spectroscopic distance estimates. Our resulting metallicity calibration uses the sodium doublet at 2.2 μm as the sole indicator for metallicity. It has an accuracy of 0.12 dex inferred from the scatter between the metallicities of the primaries and the estimated metallicities of the secondaries. Our relation is valid for NIR spectral types from M1V to M5V and for -1.0 dex < [Fe/H] < +0.35 dex. We present a new color-color metallicity relation using J-H and J-K colors that directly relates two observables: the distance from the M dwarf main sequence and equivalent width of the sodium line at 2.2 μm. We used radial velocities of M dwarf binaries, observations at different epochs, and comparison between our measurements and precisely measured radial velocities to demonstrate a 4 km s-1 accuracy.

AB - We present metallicities, radial velocities, and near-infrared (NIR) spectral types for 447 M dwarfs determined from moderate resolution (R ≈ 2000) NIR spectra obtained with the NASA Infrared Telescope Facility (IRTF)/SpeX. These M dwarfs are primarily targets of the MEarth Survey, a transiting planet survey searching for super Earths around mid-to-late M dwarfs within 33 pc. We present NIR spectral types for each star and new spectral templates for the IRTF in the Y, J, H, and K-bands, created using M dwarfs with near-solar metallicities. We developed two spectroscopic distance calibrations that use NIR spectral type or an index based on the curvature of the K-band continuum. Our distance calibration has a scatter of 14%. We searched 27 NIR spectral lines and 10 spectral indices for metallicity sensitive features, taking into account correlated noise in our estimates of the errors on these parameters. We calibrated our relation using 36 M dwarfs in common proper pairs with an F-, G-, or K-type star of known metallicity. We validated the physical association of these pairs using proper motions, radial velocities, and spectroscopic distance estimates. Our resulting metallicity calibration uses the sodium doublet at 2.2 μm as the sole indicator for metallicity. It has an accuracy of 0.12 dex inferred from the scatter between the metallicities of the primaries and the estimated metallicities of the secondaries. Our relation is valid for NIR spectral types from M1V to M5V and for -1.0 dex < [Fe/H] < +0.35 dex. We present a new color-color metallicity relation using J-H and J-K colors that directly relates two observables: the distance from the M dwarf main sequence and equivalent width of the sodium line at 2.2 μm. We used radial velocities of M dwarf binaries, observations at different epochs, and comparison between our measurements and precisely measured radial velocities to demonstrate a 4 km s-1 accuracy.

KW - Stars: abundances

KW - Stars: fundamental parameters

KW - Stars: kinematics and dynamics

KW - Stars: late-type

KW - Stars: low-mass

KW - Techniques: radial velocities

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Newton ER, Charbonneau D, Irwin J, Berta-Thompson ZK, Rojas-Ayala B, Covey K y otros. Near-infrared metallicities, radial velocities, and spectral types for 447 nearby M dwarfs. Astronomical Journal. 2014 ene 1;147(1). 20. https://doi.org/10.1088/0004-6256/147/1/20