Poster Open Access

A High Resolution H- and K-Band Spectroscopic Sequence of Ultracool Dwarfs

Greco, Jennifer J.; Cushing, Michael C.

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Greco, Jennifer J.</dc:creator>
  <dc:creator>Cushing, Michael C.</dc:creator>
  <dc:description>Brown dwarfs are substellar objects too low mass to initiate the hydrogen fusion necessary to be considered stars. Ultracool dwarfs, objects with spectral types of M7 or later, are a mix of low mass stars and brown dwarfs. We have obtained the first high-resolution (R ∼ 45, 000) H- and K-band spectral sequence of ultracool dwarfs with spectral types ranging from M1.5 V to T6, including known low-gravity objects at six spectral types (M9, L0, L1, L2, L3, L5). All spectra were obtained using the Immersion Grating INfrared Spectrometer (IGRINS) at a resolving power of R ∼ 45,000. We compared 22 of our objects to synthetic spectra created from the atmospheric models of Saumon &amp; Marley (2008), to measure specific properties including effective temperature, cloud properties, rotational velocities, and surface gravity.</dc:description>
  <dc:subject>low-mass stars</dc:subject>
  <dc:subject>substellar objects</dc:subject>
  <dc:subject>ultracool dwarfs</dc:subject>
  <dc:subject>near-infrared spectroscopy</dc:subject>
  <dc:title>A High Resolution H- and K-Band Spectroscopic Sequence of Ultracool Dwarfs</dc:title>
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