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The discovery of a very cool, very nearby brown dwarf in the Galactic plane
Solar and Stellar Astrophysics · Submitted 2 Apr 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We report the discovery of a very cool, isolated brown dwarf, UGPS 0722-05, with the UKIDSS Galactic Plane Survey.
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The abstract, sentence by sentence
We report the discovery of a very cool, isolated brown dwarf, UGPS 0722-05, with the UKIDSS Galactic Plane Survey. The near-infrared spectrum displays deeper H2O and CH4 troughs than the coolest known T dwarfs and an unidentified absorption feature at 1.275 um. We provisionally classify the object as a T10 dwarf but note that it may in future come to be regarded as the first example of a new spectral type. The distance is measured by trigonometric parallax as d=4.1{-0.5}{+0.6} pc, making it the closest known isolated brown dwarf. With the aid of Spitzer/IRAC we measure H-[4.5] = 4.71. It is the coolest brown dwarf presently known -- the only known T dwarf that is redder in H-[4.5] is the peculiar T7.5 dwarf SDSS J1416+13B, which is thought to be warmer and more luminous than UGPS 0722-05. Our measurement of the luminosity, aided by Gemini/T-ReCS N band photometry, is L = 9.2 +/- 3.1x10^{-7} Lsun. Using a comparison with well studied T8.5 and T9 dwarfs we deduce Teff=520 +/- 40 K. This is supported by predictions of the Saumon & Marley models. With apparent magnitude J=16.52, UGPS 0722-05 is the brightest T dwarf discovered by UKIDSS so far. It offers opportunities for future study via high resolution near-infrared spectroscopy and spectroscopy in the thermal infrared.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We report the discovery of a very cool, isolated brown dwarf, UGPS 0722-05, with the UKIDSS Galactic Plane Survey. | contribution 0.92 | 0.96 | 0.77 | asserted 1.00 |
| s1 | The near-infrared spectrum displays deeper H2O and CH4 troughs than the coolest known T dwarfs and an unidentified absorption feature at 1.275 um. | result 1.00 | 0.85 | 0.09 | asserted 1.00 |
| s2 | We provisionally classify the object as a T10 dwarf but note that it may in future come to be regarded as the first example of a new spectral type. | interpretation 0.83 | 0.88 | 0.29 | hedged possibility 0.86 |
| s3 | The distance is measured by trigonometric parallax as d=4.1{-0.5}{+0.6} pc, making it the closest known isolated brown dwarf. | result 1.00 | 0.92 | 0.24 | asserted 1.00 |
| s4 | With the aid of Spitzer/IRAC we measure H-[4.5] = 4.71. | result 0.93 | 0.96 | 0.04 | asserted 1.00 |
| s5 | It is the coolest brown dwarf presently known -- the only known T dwarf that is redder in H-[4.5] is the peculiar T7.5 dwarf SDSS J1416+13B, which is thought to be warmer and more luminous than UGPS 0722-05. | result 0.76 | 0.53 | 0.23 | asserted 0.96 |
| s6 | Our measurement of the luminosity, aided by Gemini/T-ReCS N band photometry, is L = 9.2 +/- 3.1x10^{-7} Lsun. | result 1.00 | 0.97 | 0.08 | asserted 1.00 |
| s7 | Using a comparison with well studied T8.5 and T9 dwarfs we deduce Teff=520 +/- 40 K. | result 0.99 | 0.95 | 0.14 | asserted 0.93 |
| s8 | This is supported by predictions of the Saumon & Marley models. | interpretation 0.89 | 0.14 | 0.05 | asserted 0.80 |
| s9 | With apparent magnitude J=16.52, UGPS 0722-05 is the brightest T dwarf discovered by UKIDSS so far. | result 0.96 | 0.85 | 0.08 | asserted 1.00 |
| s10 | It offers opportunities for future study via high resolution near-infrared spectroscopy and spectroscopy in the thermal infrared. | future work 1.00 | 0.15 | 0.04 | asserted 0.66 |
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Original abstract
We report the discovery of a very cool, isolated brown dwarf, UGPS 0722-05, with the UKIDSS Galactic Plane Survey. The near-infrared spectrum displays deeper H2O and CH4 troughs than the coolest known T dwarfs and an unidentified absorption feature at 1.275 um. We provisionally classify the object as a T10 dwarf but note that it may in future come to be regarded as the first example of a new spectral type. The distance is measured by trigonometric parallax as d=4.1{-0.5}{+0.6} pc, making it the closest known isolated brown dwarf. With the aid of Spitzer/IRAC we measure H-[4.5] = 4.71. It is the coolest brown dwarf presently known -- the only known T dwarf that is redder in H-[4.5] is the peculiar T7.5 dwarf SDSS J1416+13B, which is thought to be warmer and more luminous than UGPS 0722-05. Our measurement of the luminosity, aided by Gemini/T-ReCS N band photometry, is L = 9.2 +/- 3.1x10^{-7} Lsun. Using a comparison with well studied T8.5 and T9 dwarfs we deduce Teff=520 +/- 40 K. This is supported by predictions of the Saumon & Marley models. With apparent magnitude J=16.52, UGPS 0722-05 is the brightest T dwarf discovered by UKIDSS so far. It offers opportunities for future study via high resolution near-infrared spectroscopy and spectroscopy in the thermal infrared.
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