Temperature constraints on the coldest brown dwarf known: WISE 0855-0714

J. C. Beamín, V. D. Ivanov, A. Bayo, K. Mužić, H. M.J. Boffin, F. Allard, D. Homeier, D. Minniti, M. Gromadzki, R. Kurtev, N. Lodieu, E. L. Martin, R. A. Mendez

Resultado de la investigación: Article

13 Citas (Scopus)

Resumen

Context. Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. Aims. We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714, located ~2.2 pc away, and to improve its temperature estimate (Teff = 225-260 K) from a comparison with state-of-the-art models of BD atmospheres. Methods. We observed the field containing WISE0855-0714 with HAWK-I at the VLT in the Y band. For BDs with Teff< 500 K theoretical models predict strong signal (or rather less molecular absorption) in this band. Results. WISE0855-0714 was not detected in our Y-band images, thus placing an upper limit on its brightness to Y> 24.4 mag at 3σ level, leading to Y-[4.5] > 10.5. Combining this limit with previous detections and upper limits at other wavelengths, WISE0855-0714 is confirmed as the reddest BD detected, further supporting its status as the coldest known brown dwarf. We applied spectral energy distribution fitting with collections of models from two independent groups for extremely cool BD atmospheres leading to an effective temperature of Teff< 250 K,

Idioma originalEnglish
Número de artículoL8
PublicaciónAstronomy and Astrophysics
Volumen570
DOI
EstadoPublished - 1 oct 2014

Huella dactilar

Wide-field Infrared Survey Explorer
planetary mass
atmospheres
self absorption
atmosphere
spectral energy distribution
surface temperature
near infrared
temperature
wavelength
estimates
wavelengths
energy
cold
detection
distribution
state of the art
comparison
method

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Beamín, J. C., Ivanov, V. D., Bayo, A., Mužić, K., Boffin, H. M. J., Allard, F., ... Mendez, R. A. (2014). Temperature constraints on the coldest brown dwarf known: WISE 0855-0714. Astronomy and Astrophysics, 570, [L8]. https://doi.org/10.1051/0004-6361/201424505
Beamín, J. C. ; Ivanov, V. D. ; Bayo, A. ; Mužić, K. ; Boffin, H. M.J. ; Allard, F. ; Homeier, D. ; Minniti, D. ; Gromadzki, M. ; Kurtev, R. ; Lodieu, N. ; Martin, E. L. ; Mendez, R. A. / Temperature constraints on the coldest brown dwarf known : WISE 0855-0714. En: Astronomy and Astrophysics. 2014 ; Vol. 570.
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abstract = "Context. Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. Aims. We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714, located ~2.2 pc away, and to improve its temperature estimate (Teff = 225-260 K) from a comparison with state-of-the-art models of BD atmospheres. Methods. We observed the field containing WISE0855-0714 with HAWK-I at the VLT in the Y band. For BDs with Teff< 500 K theoretical models predict strong signal (or rather less molecular absorption) in this band. Results. WISE0855-0714 was not detected in our Y-band images, thus placing an upper limit on its brightness to Y> 24.4 mag at 3σ level, leading to Y-[4.5] > 10.5. Combining this limit with previous detections and upper limits at other wavelengths, WISE0855-0714 is confirmed as the reddest BD detected, further supporting its status as the coldest known brown dwarf. We applied spectral energy distribution fitting with collections of models from two independent groups for extremely cool BD atmospheres leading to an effective temperature of Teff< 250 K,",
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Beamín, JC, Ivanov, VD, Bayo, A, Mužić, K, Boffin, HMJ, Allard, F, Homeier, D, Minniti, D, Gromadzki, M, Kurtev, R, Lodieu, N, Martin, EL & Mendez, RA 2014, 'Temperature constraints on the coldest brown dwarf known: WISE 0855-0714', Astronomy and Astrophysics, vol. 570, L8. https://doi.org/10.1051/0004-6361/201424505

Temperature constraints on the coldest brown dwarf known : WISE 0855-0714. / Beamín, J. C.; Ivanov, V. D.; Bayo, A.; Mužić, K.; Boffin, H. M.J.; Allard, F.; Homeier, D.; Minniti, D.; Gromadzki, M.; Kurtev, R.; Lodieu, N.; Martin, E. L.; Mendez, R. A.

En: Astronomy and Astrophysics, Vol. 570, L8, 01.10.2014.

Resultado de la investigación: Article

TY - JOUR

T1 - Temperature constraints on the coldest brown dwarf known

T2 - WISE 0855-0714

AU - Beamín, J. C.

AU - Ivanov, V. D.

AU - Bayo, A.

AU - Mužić, K.

AU - Boffin, H. M.J.

AU - Allard, F.

AU - Homeier, D.

AU - Minniti, D.

AU - Gromadzki, M.

AU - Kurtev, R.

AU - Lodieu, N.

AU - Martin, E. L.

AU - Mendez, R. A.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - Context. Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. Aims. We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714, located ~2.2 pc away, and to improve its temperature estimate (Teff = 225-260 K) from a comparison with state-of-the-art models of BD atmospheres. Methods. We observed the field containing WISE0855-0714 with HAWK-I at the VLT in the Y band. For BDs with Teff< 500 K theoretical models predict strong signal (or rather less molecular absorption) in this band. Results. WISE0855-0714 was not detected in our Y-band images, thus placing an upper limit on its brightness to Y> 24.4 mag at 3σ level, leading to Y-[4.5] > 10.5. Combining this limit with previous detections and upper limits at other wavelengths, WISE0855-0714 is confirmed as the reddest BD detected, further supporting its status as the coldest known brown dwarf. We applied spectral energy distribution fitting with collections of models from two independent groups for extremely cool BD atmospheres leading to an effective temperature of Teff< 250 K,

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KW - Brown dwarfs

KW - Infrared: stars

KW - Proper motions

KW - Solar neighborhood

KW - Stars: individual: WISE 0855-0714

KW - Stars: low-mass

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JO - Astronomy and Astrophysics

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Beamín JC, Ivanov VD, Bayo A, Mužić K, Boffin HMJ, Allard F y otros. Temperature constraints on the coldest brown dwarf known: WISE 0855-0714. Astronomy and Astrophysics. 2014 oct 1;570. L8. https://doi.org/10.1051/0004-6361/201424505