Properties of the solar neighbor WISE J072003.20-084651.2

V. D. Ivanov, P. Vaisanen, A. Y. Kniazev, Y. Beletsky, E. E. Mamajek, K. Mužić, J. C. Beamín, H. M.J. Boffin, D. Pourbaix, P. Gandhi, A. Gulbis, L. Monaco, I. Saviane, R. Kurtev, D. Mawet, J. Borissova, D. Minniti

Resultado de la investigación: Article

Resumen

Context. The severe crowding towards the Galactic plane suggests that the census of nearby stars in that direction may be incomplete. Recently, Scholz reported a new M9 object at an estimated distance d ≃ 7 pc (WISE J072003.20- 084651.2; hereafter WISE J0720) at Galactic latitude b = 2.3°. Aims. Our goals are to determine the physical characteristics of WISE J0720, its kinematic properties, and to address the question of whether it is a binary object, as was suggested in the discovery paper. Methods. Optical and infrared spectroscopy from the Southern African Large Telescope and Magellan, respectively, and spectral energy distribution fitting were used to determine the spectral type of WISE J0720. The measured radial velocity, proper motion, and parallax yielded its Galactic velocities. We also investigated if WISE J0720 may show X-ray activity based on archival data. Results. Our spectra are consistent with spectral type L0 ± 1. We find no evidence for binarity, apart from a minor 2σ level difference in the radial velocities taken at two different epochs. The spatial velocity of WISE J0720 does not connect it to any known moving group; instead, it places the object with high probability in the old thin disk or in the thick disk. The spectral energy distribution fit hints at excess in the 12 μm and 22 μm WISE bands which may be due to a redder companion, but the same excess is visible in other late-type objects, and it more likely implies a shortcoming of the models (e.g., problems with the effective wavelengths of the filters for these extremely cool objects, etc.) rather than a disk or redder companion. The optical spectrum shows some Hα emission, indicative of stellar activity. Archival X-ray observations yield no detection. Conclusions. WISE J0720 is a new member of the solar neighborhood, the third nearest L dwarf. Our data do not support the hypothesis of its binary nature.

Idioma originalEnglish
PublicaciónAstronomy and Astrophysics
Volumen574
DOI
EstadoPublished - 1 feb 2015

Huella dactilar

Wide-field Infrared Survey Explorer
spectral energy distribution
infrared spectroscopy
radial velocity
energy
census
kinematics
stellar activity
filter
wavelength
crowding
solar neighborhood
parallax
proper motion
optical spectrum
x rays
time measurement
telescopes
filters
stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Ivanov, V. D., Vaisanen, P., Kniazev, A. Y., Beletsky, Y., Mamajek, E. E., Mužić, K., ... Minniti, D. (2015). Properties of the solar neighbor WISE J072003.20-084651.2. Astronomy and Astrophysics, 574. https://doi.org/10.1051/0004-6361/201424883
Ivanov, V. D. ; Vaisanen, P. ; Kniazev, A. Y. ; Beletsky, Y. ; Mamajek, E. E. ; Mužić, K. ; Beamín, J. C. ; Boffin, H. M.J. ; Pourbaix, D. ; Gandhi, P. ; Gulbis, A. ; Monaco, L. ; Saviane, I. ; Kurtev, R. ; Mawet, D. ; Borissova, J. ; Minniti, D. / Properties of the solar neighbor WISE J072003.20-084651.2. En: Astronomy and Astrophysics. 2015 ; Vol. 574.
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title = "Properties of the solar neighbor WISE J072003.20-084651.2",
abstract = "Context. The severe crowding towards the Galactic plane suggests that the census of nearby stars in that direction may be incomplete. Recently, Scholz reported a new M9 object at an estimated distance d ≃ 7 pc (WISE J072003.20- 084651.2; hereafter WISE J0720) at Galactic latitude b = 2.3°. Aims. Our goals are to determine the physical characteristics of WISE J0720, its kinematic properties, and to address the question of whether it is a binary object, as was suggested in the discovery paper. Methods. Optical and infrared spectroscopy from the Southern African Large Telescope and Magellan, respectively, and spectral energy distribution fitting were used to determine the spectral type of WISE J0720. The measured radial velocity, proper motion, and parallax yielded its Galactic velocities. We also investigated if WISE J0720 may show X-ray activity based on archival data. Results. Our spectra are consistent with spectral type L0 ± 1. We find no evidence for binarity, apart from a minor 2σ level difference in the radial velocities taken at two different epochs. The spatial velocity of WISE J0720 does not connect it to any known moving group; instead, it places the object with high probability in the old thin disk or in the thick disk. The spectral energy distribution fit hints at excess in the 12 μm and 22 μm WISE bands which may be due to a redder companion, but the same excess is visible in other late-type objects, and it more likely implies a shortcoming of the models (e.g., problems with the effective wavelengths of the filters for these extremely cool objects, etc.) rather than a disk or redder companion. The optical spectrum shows some Hα emission, indicative of stellar activity. Archival X-ray observations yield no detection. Conclusions. WISE J0720 is a new member of the solar neighborhood, the third nearest L dwarf. Our data do not support the hypothesis of its binary nature.",
keywords = "Proper motions, Solar neighborhood, Stars: Distances, Stars: Individual: 2MASS J07200708-0845589, Stars: Individual: WISE J072003.20-84651.2, Stars: Low-mass",
author = "Ivanov, {V. D.} and P. Vaisanen and Kniazev, {A. Y.} and Y. Beletsky and Mamajek, {E. E.} and K. Mužić and Beam{\'i}n, {J. C.} and Boffin, {H. M.J.} and D. Pourbaix and P. Gandhi and A. Gulbis and L. Monaco and I. Saviane and R. Kurtev and D. Mawet and J. Borissova and D. Minniti",
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Ivanov, VD, Vaisanen, P, Kniazev, AY, Beletsky, Y, Mamajek, EE, Mužić, K, Beamín, JC, Boffin, HMJ, Pourbaix, D, Gandhi, P, Gulbis, A, Monaco, L, Saviane, I, Kurtev, R, Mawet, D, Borissova, J & Minniti, D 2015, 'Properties of the solar neighbor WISE J072003.20-084651.2', Astronomy and Astrophysics, vol. 574. https://doi.org/10.1051/0004-6361/201424883

Properties of the solar neighbor WISE J072003.20-084651.2. / Ivanov, V. D.; Vaisanen, P.; Kniazev, A. Y.; Beletsky, Y.; Mamajek, E. E.; Mužić, K.; Beamín, J. C.; Boffin, H. M.J.; Pourbaix, D.; Gandhi, P.; Gulbis, A.; Monaco, L.; Saviane, I.; Kurtev, R.; Mawet, D.; Borissova, J.; Minniti, D.

En: Astronomy and Astrophysics, Vol. 574, 01.02.2015.

Resultado de la investigación: Article

TY - JOUR

T1 - Properties of the solar neighbor WISE J072003.20-084651.2

AU - Ivanov, V. D.

AU - Vaisanen, P.

AU - Kniazev, A. Y.

AU - Beletsky, Y.

AU - Mamajek, E. E.

AU - Mužić, K.

AU - Beamín, J. C.

AU - Boffin, H. M.J.

AU - Pourbaix, D.

AU - Gandhi, P.

AU - Gulbis, A.

AU - Monaco, L.

AU - Saviane, I.

AU - Kurtev, R.

AU - Mawet, D.

AU - Borissova, J.

AU - Minniti, D.

PY - 2015/2/1

Y1 - 2015/2/1

N2 - Context. The severe crowding towards the Galactic plane suggests that the census of nearby stars in that direction may be incomplete. Recently, Scholz reported a new M9 object at an estimated distance d ≃ 7 pc (WISE J072003.20- 084651.2; hereafter WISE J0720) at Galactic latitude b = 2.3°. Aims. Our goals are to determine the physical characteristics of WISE J0720, its kinematic properties, and to address the question of whether it is a binary object, as was suggested in the discovery paper. Methods. Optical and infrared spectroscopy from the Southern African Large Telescope and Magellan, respectively, and spectral energy distribution fitting were used to determine the spectral type of WISE J0720. The measured radial velocity, proper motion, and parallax yielded its Galactic velocities. We also investigated if WISE J0720 may show X-ray activity based on archival data. Results. Our spectra are consistent with spectral type L0 ± 1. We find no evidence for binarity, apart from a minor 2σ level difference in the radial velocities taken at two different epochs. The spatial velocity of WISE J0720 does not connect it to any known moving group; instead, it places the object with high probability in the old thin disk or in the thick disk. The spectral energy distribution fit hints at excess in the 12 μm and 22 μm WISE bands which may be due to a redder companion, but the same excess is visible in other late-type objects, and it more likely implies a shortcoming of the models (e.g., problems with the effective wavelengths of the filters for these extremely cool objects, etc.) rather than a disk or redder companion. The optical spectrum shows some Hα emission, indicative of stellar activity. Archival X-ray observations yield no detection. Conclusions. WISE J0720 is a new member of the solar neighborhood, the third nearest L dwarf. Our data do not support the hypothesis of its binary nature.

AB - Context. The severe crowding towards the Galactic plane suggests that the census of nearby stars in that direction may be incomplete. Recently, Scholz reported a new M9 object at an estimated distance d ≃ 7 pc (WISE J072003.20- 084651.2; hereafter WISE J0720) at Galactic latitude b = 2.3°. Aims. Our goals are to determine the physical characteristics of WISE J0720, its kinematic properties, and to address the question of whether it is a binary object, as was suggested in the discovery paper. Methods. Optical and infrared spectroscopy from the Southern African Large Telescope and Magellan, respectively, and spectral energy distribution fitting were used to determine the spectral type of WISE J0720. The measured radial velocity, proper motion, and parallax yielded its Galactic velocities. We also investigated if WISE J0720 may show X-ray activity based on archival data. Results. Our spectra are consistent with spectral type L0 ± 1. We find no evidence for binarity, apart from a minor 2σ level difference in the radial velocities taken at two different epochs. The spatial velocity of WISE J0720 does not connect it to any known moving group; instead, it places the object with high probability in the old thin disk or in the thick disk. The spectral energy distribution fit hints at excess in the 12 μm and 22 μm WISE bands which may be due to a redder companion, but the same excess is visible in other late-type objects, and it more likely implies a shortcoming of the models (e.g., problems with the effective wavelengths of the filters for these extremely cool objects, etc.) rather than a disk or redder companion. The optical spectrum shows some Hα emission, indicative of stellar activity. Archival X-ray observations yield no detection. Conclusions. WISE J0720 is a new member of the solar neighborhood, the third nearest L dwarf. Our data do not support the hypothesis of its binary nature.

KW - Proper motions

KW - Solar neighborhood

KW - Stars: Distances

KW - Stars: Individual: 2MASS J07200708-0845589

KW - Stars: Individual: WISE J072003.20-84651.2

KW - Stars: Low-mass

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U2 - 10.1051/0004-6361/201424883

DO - 10.1051/0004-6361/201424883

M3 - Article

AN - SCOPUS:84921722357

VL - 574

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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Ivanov VD, Vaisanen P, Kniazev AY, Beletsky Y, Mamajek EE, Mužić K y otros. Properties of the solar neighbor WISE J072003.20-084651.2. Astronomy and Astrophysics. 2015 feb 1;574. https://doi.org/10.1051/0004-6361/201424883