February 26, 2021 Poster Open Access

Greco, Jennifer J.; Cushing, Michael C.

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    <subfield code="a">A High Resolution H- and K-Band Spectroscopic Sequence of Ultracool Dwarfs</subfield>
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    <subfield code="a">&lt;p&gt;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,&amp;nbsp;are a mix of low mass stars and brown dwarfs. We have obtained the first high-resolution (R &amp;sim; 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 &amp;sim; 45,000. We compared 22 of our objects to synthetic spectra created from the atmospheric models of Saumon &amp;amp; Marley (2008), to measure specific properties including effective temperature, cloud properties, rotational velocities, and surface gravity.&lt;/p&gt;</subfield>
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