Methane band and Spitzer mid‐IR imaging of L and T dwarf candidates in the Pleiades
Identifieur interne : 006387 ( Main/Exploration ); précédent : 006386; suivant : 006388Methane band and Spitzer mid‐IR imaging of L and T dwarf candidates in the Pleiades
Auteurs : S. L. Casewell [Royaume-Uni] ; R. F. Jameson ; M. R. Burleigh ; P. D. Dobbie [Australie] ; M. Roy ; S. T. Hodgkin [Royaume-Uni] ; E. Moraux [France]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-04-11.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Classification.
English descriptors
- KwdEn :
- 2mass, Allard, Baraffe, Bihain, Bolometric luminosity, Bouvier, Brown dwarf, Brown dwarf stars, Burgasser, Casewell, Classification, Cluster members, Color, Colour, Colours, Cond, Cond models, Dwarf, Dwarf candidates, Dwarf regime, Dwarf sequence, Effective temperature, Effective temperatures, Evolutionary models, Gravity, Imaging, Irac, Kirkpatrick, Leggett, Low-mass stars, Lower gravity, Lower temperature, Lter, Luminosity, Methane, Methane absorption, Methane colour index, Mnras, Models, Monthly notices, Niri, Open clusters, Photometric, Photometry, Pixel, Pleiades, Proper motions, Saumon marley, Spectral class, Spectral type, Spectral types, Spitzer, Spitzer imaging, Spitzer irac, Star clusters, Stauffer, Total luminosity, Upper bound, Zapatero osorio.
- Teeft :
- 2mass, Allard, Baraffe, Bihain, Bolometric luminosity, Bouvier, Brown dwarf, Burgasser, Casewell, Cluster members, Colour, Colours, Cond, Cond models, Dwarf, Dwarf candidates, Dwarf regime, Dwarf sequence, Effective temperature, Effective temperatures, Evolutionary models, Imaging, Irac, Kirkpatrick, Leggett, Lower gravity, Lower temperature, Lter, Luminosity, Methane, Methane absorption, Methane colour index, Mnras, Monthly notices, Niri, Photometric, Photometry, Pixel, Pleiades, Proper motions, Saumon marley, Spectral class, Spectral type, Spectral types, Spitzer, Spitzer imaging, Spitzer irac, Stauffer, Total luminosity, Zapatero osorio.
Abstract
We present Spitzer observations at [3.6] and [4.5] μm together with the methane short (1.58 μm) − methane long (1.69 μm) colour for three cool dwarfs in the Pleiades, PLZJ23, PLZJ93 and PLZJ100. We determine the effective temperatures of PLZJ23 and PLZJ93 to be ≈1200 and ≈1100 K. From the broad‐band photometry we place an upper limit of 1100 K on the effective temperature of PLZJ100 but lack the data required to determine the value more precisely. These temperatures are in the T dwarf regime, yet the methane colours indicate no methane is present. We attribute this to youth/low gravity in line with theoretical expectations. However, we find even less methane is present than predicted by the models. PLZJ23 and PLZJ93 are also very bright in the [3.6] μm waveband (PLZJ100 is not measured) compared to field brown dwarfs which can also be explained by this lack of methane. The definition of the T spectral class is the appearance of methane absorption, so strictly, via this definition, PLZJ93 and PLZJ100 cannot be described as T dwarfs. The colours of these two objects are, however, not compatible with those of L dwarfs. Thus we have a classification problem and cannot assign these objects a (photometric) spectral type.
Url:
DOI: 10.1111/j.1365-2966.2010.18044.x
Affiliations:
- Australie, France, Royaume-Uni
- Angleterre, Angleterre de l'Est, Auvergne-Rhône-Alpes, Rhône-Alpes
- Cambridge, Grenoble
- Université Joseph Fourier, Université de Cambridge
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Le document en format XML
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We determine the effective temperatures of PLZJ23 and PLZJ93 to be ≈1200 and ≈1100 K. From the broad‐band photometry we place an upper limit of 1100 K on the effective temperature of PLZJ100 but lack the data required to determine the value more precisely. These temperatures are in the T dwarf regime, yet the methane colours indicate no methane is present. We attribute this to youth/low gravity in line with theoretical expectations. However, we find even less methane is present than predicted by the models. PLZJ23 and PLZJ93 are also very bright in the [3.6] μm waveband (PLZJ100 is not measured) compared to field brown dwarfs which can also be explained by this lack of methane. The definition of the T spectral class is the appearance of methane absorption, so strictly, via this definition, PLZJ93 and PLZJ100 cannot be described as T dwarfs. The colours of these two objects are, however, not compatible with those of L dwarfs. Thus we have a classification problem and cannot assign these objects a (photometric) spectral type.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Angleterre de l'Est</li><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Cambridge</li><li>Grenoble</li></settlement><orgName><li>Université Joseph Fourier</li><li>Université de Cambridge</li></orgName></list><tree><noCountry><name sortKey="Burleigh, M R" sort="Burleigh, M R" uniqKey="Burleigh M" first="M. R." last="Burleigh">M. R. Burleigh</name><name sortKey="Jameson, R F" sort="Jameson, R F" uniqKey="Jameson R" first="R. F." last="Jameson">R. F. Jameson</name><name sortKey="Roy, M" sort="Roy, M" uniqKey="Roy M" first="M." last="Roy">M. Roy</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Casewell, S L" sort="Casewell, S L" uniqKey="Casewell S" first="S. L." last="Casewell">S. L. Casewell</name></noRegion><name sortKey="Hodgkin, S T" sort="Hodgkin, S T" uniqKey="Hodgkin S" first="S. T." last="Hodgkin">S. T. Hodgkin</name></country><country name="Australie"><noRegion><name sortKey="Dobbie, P D" sort="Dobbie, P D" uniqKey="Dobbie P" first="P. D." last="Dobbie">P. D. Dobbie</name></noRegion></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Moraux, E" sort="Moraux, E" uniqKey="Moraux E" first="E." last="Moraux">E. Moraux</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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