SpeX: a medium-resolution IR spectrograph for IRTF

Rayner, John; Toomey, Douglas W.; Onaka, Peter M.; Denault, Anthony J.; Stahlberger, Werner E.; Watanabe, Darryl Y.; Wang, Shu-i

doi:10.1117/12.317273

Cited by 53 publications

(33 citation statements)

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“…Continuing our long-term monitoring campaign, we observed Pluto and Charon on seven nights during 2013 using the SpeX infrared spectrometer at IRTF (Rayner et al 1998(Rayner et al , 2003. Observing circumstances appear in Table 1.…”

Section: Observationsmentioning

confidence: 99%

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

Grundy¹,

Olkin²,

Young³

et al. 2014

Icarus

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IRTF/SpeX observations of Pluto's near-infrared reflectance spectrum during 2013 show vibrational absorption features of CO and N 2 ices at 1.58 and 2.15 µm, respectively, that are weaker than had been observed during the preceding decade. To reconcile declining volatile ice absorptions with a lack of decline in Pluto's atmospheric pressure, we suggest these ices could be getting harder to see because of increasing scattering by small CH 4 crystals, rather than because they are disappearing from the observed hemisphere.

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Section: Observationsmentioning

confidence: 99%

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

Grundy¹,

Olkin²,

Young³

et al. 2014

Icarus

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“…We used the facilty instrument SpeX (Rayner et al 1998) at NASA's Infrared Telescope Facility located on Mauna Kea, Hawaii on 2012 April 20 UT. For imaging, we obtained 9 dithered exposures of WISE J1711+3500 and the UKIRT faint standard FS 27 using the MKO J-band filter.…”

Section: Irtf/spex Photometry and Spectroscopy Of Wise J1711+3500mentioning

confidence: 99%

TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS^,

Liu

Dupuy

Bowler

et al. 2012

ApJ

102

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Using Keck laser guide star adaptive optics imaging, we have found that the T9 dwarf WISE J1217+1626 and T8 dwarf WISE J1711+3500 are exceptional binaries, with unusually wide separations (≈0.8 ′′ , 8-15 AU), large near-IR flux ratios (≈2-3 mags), and small mass ratios (≈0.5) compared to previously known field ultracool binaries. Keck/NIRSPEC H-band spectra give a spectral type of Y0 for WISE J1217+1626B, and photometric estimates suggest T9.5 for WISE J1711+3500B. The WISE J1217+1626AB system is very similar to the T9+Y0 binary CFBDSIR J1458+1013AB; these two systems are the coldest known substellar multiples, having secondary components of ≈400 K and being planetary-mass binaries if their ages are 1 Gyr. Both WISE J1217+1626B and CFBDSIR J1458+1013B have strikingly blue Y − J colors compared to previously known T dwarfs, including their T9 primaries. Combining all available data, we find that Y − J color drops precipitously between the very latest T dwarfs and the Y dwarfs. The fact that this is seen in (coeval, mono-metallicity) binaries demonstrates that the color drop arises from a change in temperature, not surface

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“…12 On 2008 June 27 UT we obtained a near-infrared spectrum of LHS 2397a (≈0.82-2.4 μm) using IRTF/SpeX (Rayner et al 1998) in SXD mode (R = 1200), which we reduced using the SpeXtool software package (Vacca et al 2003;Cushing et al 2004). Figure 8.…”

Section: Bolometric Luminositiesmentioning

confidence: 99%

KECK LASER GUIDE STAR ADAPTIVE OPTICS MONITORING OF THE M8+L7 BINARY LHS 2397aAB: FIRST DYNAMICAL MASS BENCHMARK AT THE L/T TRANSITION

Dupuy

Liu

Ireland

2009

ApJ

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We present Keck laser guide star adaptive optics imaging and aperture masking observations of the M8+L7 binary LHS 2397aAB. Together with archival Hubble Space Telescope, Gemini-North, and Very Large Telescope data, our observations span 11.8 years of the binary's 14.2 year orbital period. We determine a total dynamical mass of 0.146. Using the combined observational constraints of the total mass and individual luminosities, the Tucson (Lyon) evolutionary models give an age for the system of 1.5, which is consistent with its space motion based on a comparison to the Besançon Galactic structure model. We also use these models to determine the mass ratio, giving individual masses of 0.0839 −0.012 M ) for LHS 2397aB. Because LHS 2397aB is very close to the theoretical mass limit of lithium burning, which remains untested by dynamical masses, measuring its lithium depletion would uniquely test substellar models. We estimate a spectral type of L7 ± 1 for LHS 2397aB, making it the first L/T transition object with a dynamical mass determination. This enables a precise estimate of its effective temperature from Tucson (Lyon) evolutionary models of 1450 ± 40 K (1430 ± 40 K), which is 200 K higher than estimates for young late-L companions but consistent with older late-L field dwarfs, supporting the idea that the temperature of the L/T transition is surface gravity dependent. Comparing our temperature estimate for LHS 2397aB to those derived from spectral synthesis modeling for similar objects reveals consistency between evolutionary and atmospheric models at the L/T transition, despite the currently limited understanding of this phase of substellar evolution. Future dynamical masses for L/T binaries spanning a range of surface gravity, age, and mass will provide the next critical tests of substellar models at the L/T transition.

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SpeX: a medium-resolution IR spectrograph for IRTF

Cited by 53 publications

References 0 publications

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS^,

KECK LASER GUIDE STAR ADAPTIVE OPTICS MONITORING OF THE M8+L7 BINARY LHS 2397aAB: FIRST DYNAMICAL MASS BENCHMARK AT THE L/T TRANSITION

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SpeX: a medium-resolution IR spectrograph for IRTF

Cited by 53 publications

References 0 publications

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

Near-infrared spectral monitoring of Pluto’s ices II: Recent decline of CO and N2 ice absorptions

TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS,

KECK LASER GUIDE STAR ADAPTIVE OPTICS MONITORING OF THE M8+L7 BINARY LHS 2397aAB: FIRST DYNAMICAL MASS BENCHMARK AT THE L/T TRANSITION

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TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS^,