The Spectrum of Jupiter at Millimeter Wavelengths

Wrixon, G. T.; Welch, W. J.; Thornton, D.

doi:10.1086/151128

Cited by 34 publications

(11 citation statements)

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“…By this means we hoped to provide a link between the reference flux density scales of planets and stars and to unify flux calibration across the IR-mm regime. Early efforts in this direction at Berkeley were described by Wrixon et al (1971). Gibson et al (2005) and have continued this radio absolute calibration work.…”

Section: Linking Infrared and Millimetric Calibrationmentioning

confidence: 97%

Far-Infrared and Millimeter Continuum Studies of K Giants: α Bootis and α Tauri

et al. 2005

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-We have imaged two normal, non-coronal, infrared-bright K giants, α Tau and α Boo, in the 1.4-mm and 2.8-mm continuum using BIMA. These stars have been used as important absolute calibrators for several infrared (IR) satellites. Our goals are: (1) to establish whether these stars radiate as simple photospheres or possess long-wavelength chromospheres; and (2) to make a connection between millimeter-wave and far-infrared (FIR) absolute flux calibrations. To accomplish these goals we also present ISO Long Wavelength Spectrometer (LWS) measurements of both these K giants. The FIR and millimeter continuum radiation is produced in the vicinity of the temperature minimum in α Tau and α Boo. We find that current photospheric models predict fluxes in reasonable agreement with those observed for wavelengths which sample the upper photosphere, namely ≤125 µm in α Tau and α Boo. We clearly detect chromospheric radiation from both stars by 2.8 mm (by 1.4 mm in the case of α Boo). Only additional observations can determine precisely where beyond 125 µm the purely radiative models fail. Until then, purely radiative models for these stars can only be used with confidence for calibration purposes below 125 µm.

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Section: Linking Infrared and Millimetric Calibrationmentioning

confidence: 97%

Far-Infrared and Millimeter Continuum Studies of K Giants: α Bootis and α Tauri

et al. 2005

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“…Wrixon et al (1971) experimented with fitting both the Van Vleck-Weisskopf (Townes and Shawlow, 1955) and the Ben-Reuven (1965) line shapes to the absorption data of Bleaney and Loubser (1950). They found that the former shape fit well at low pressures near the band center and the latter fit better at high pressures, where the effective center frequency of the band shifts toward zero frequency.…”

Section: Laboratory Datamentioning

confidence: 99%

“…The errors in the absorption formulas will translate directly into errors in the abundances deduced from model fitting. Wrixon et al (1971) reported brightness measurements at eight wavelengths over the range 0.8 cm to 1.5 cm. With some effort, absolute gain calibrations with an accuracy of 4-5% were obtained for all of these measurements.…”

Section: Laboratory Datamentioning

confidence: 99%

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Accurate jovian radio flux density measurements show ammonia to be subsaturated in the upper troposphere

Gibson

Welch

Pater

2005

Icarus

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The availability of new accurate radio flux densities of Jupiter in and around the λ1.3 cm ammonia absorption band, one from groundbased radio data and five from the WMAP satellite, permits reexamination of the structure of the Jovian upper troposphere. These flux densities, with accuracies of 1-3%, indicate that the Jovian atmospheric ammonia is globally subsaturated within and above the ammonia cloud tops, 0.4 bar ≤ P ≤ 0.6 bar, and subsolar (by a factor of 2) below the cloud base, 0.6 bar ≤ P ≤ 2 bar.

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“…We based our flux density scale on observations of Jupiter, assuming T Jupiter = 152 K at 32 GHz, with 5% uncertainty (Mason et al 1999). The spectral index of Jupiter is not constant between 26 and 36 GHz (Wrixon et al 1971), so we used Taurus A as our prime calibrator. Taurus A is slightly resolved with the CBI, but it can be well fitted by an elliptical Gaussian model.…”

Section: Observationsmentioning

confidence: 99%

First Intrinsic Anisotropy Observations with the Cosmic Background Imager

Padin

Cartwright

Mason

et al. 2001

The Astrophysical Journal

153

124

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We present the first results of observations of the intrinsic anisotropy of the cosmic microwave background radiation with the Cosmic Background Imager from a site at 5080 m altitude in northern Chile. Our observations show a sharp decrease in C l in the range l = 400-1500. The broadband amplitudes we have measured are AET band = 58 7 +7 7 −6 3 K for l = 603 +180 −166 and AET band = 29 7 +4 8 −4 2 K for l = 1190 +261 −224 , where these are half-power widths in l. Such a decrease in power at high l is one of the fundamental predictions of the standard cosmological model, and these are the first observations which cover a broad enough l range to show this decrease in a single experiment. The C l we have measured enables us to place limits on the density parameter, ª tot 0 4 or ª tot 0 7 (90% confidence).

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The Spectrum of Jupiter at Millimeter Wavelengths

Cited by 34 publications

References 0 publications

Far-Infrared and Millimeter Continuum Studies of K Giants: α Bootis and α Tauri

Far-Infrared and Millimeter Continuum Studies of K Giants: α Bootis and α Tauri

Accurate jovian radio flux density measurements show ammonia to be subsaturated in the upper troposphere

First Intrinsic Anisotropy Observations with the Cosmic Background Imager

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