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HST Survey of the O...
HST Survey of the Orion Nebula Cluster in the H2O 1.4 μm Absorption Band. I. A Census of Substellar and Planetary-mass Objects
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- Robberto, Massimo (author)
- Johns Hopkins University,Space Telescope Science Institute (STScI)
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- Gennaro, Mario (author)
- Space Telescope Science Institute (STScI)
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- Ubeira Gabellini, Maria Giulia (author)
- Universita' degli Studi di Milano,University of Milan,European Southern Observatory (ESO)
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- Hillenbrand, Lynne A. (author)
- California Institute of Technology (Caltech)
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- Pacifici, Camilla (author)
- Space Telescope Science Institute (STScI)
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- Ubeda, Leonardo (author)
- Space Telescope Science Institute (STScI)
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- Andersen, Morten (author)
- Gemini Observatory South
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- Barman, Travis (author)
- University of Arizona
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- Bellini, Andrea (author)
- Space Telescope Science Institute (STScI)
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- Rio, Nicola Da (author)
- University of Virginia
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- De Mink, Selma E. (author)
- Harvard-Smithsonian Center for Astrophysics,Universiteit Van Amsterdam,University of Amsterdam
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- Lodato, Giuseppe (author)
- Universita' degli Studi di Milano,University of Milan
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- Manara, Carlo F. (author)
- European Southern Observatory (ESO)
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- Platais, Imants (author)
- Johns Hopkins University
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- Pueyo, Laurent (author)
- Space Telescope Science Institute (STScI)
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- Strampelli, Giovanni Maria (author)
- Johns Hopkins University,Space Telescope Science Institute (STScI),Universidad de la Laguna,University of La Laguna
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- Tan, Jonathan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,University of Virginia
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- Testi, L. (author)
- European Southern Observatory (ESO)
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(creator_code:org_t)
- 2020-06-16
- 2020
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 896:1
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Abstract
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- In order to obtain a complete census of the stellar and substellar population, down to a few MJup in the ∼1 Myr old Orion Nebula Cluster, we used the infrared channel of the Wide Field Camera 3 of the Hubble Space Telescope with the F139M and F130N filters. These bandpasses correspond to the 1.4 μm H2O absorption feature and an adjacent line-free continuum region. Out of 4504 detected sources, 3352 (about 75%) appear fainter than m 130 = 14 (Vega mag) in the F130N filter, a brightness corresponding to the hydrogen-burning limit mass (M ≃ 0.072 M⊙) at ∼1 Myr. Of these, however, only 742 sources have a negative F130M-F139N color index, indicative of the presence of H2O vapor in absorption, and can therefore be classified as bona fide M and L dwarfs, with effective temperatures T ≲ 2850 K at an assumed 1 Myr cluster age. On our color-magnitude diagram (CMD), this population of sources with H2O absorption appears clearly distinct from the larger background population of highly reddened stars and galaxies with positive F130M-F139N color index and can be traced down to the sensitivity limit of our survey, m 130 ≃ 21.5, corresponding to a 1 Myr old ≃3 MJup planetary-mass object under about 2 mag of visual extinction. Theoretical models of the BT-Settl family predicting substellar isochrones of 1, 2, and 3 Myr down to ∼1 MJup fail to reproduce the observed H2O color index at M ≲ 20 MJup. We perform a Bayesian analysis to determine extinction, mass, and effective temperature of each substellar member of our sample, together with its membership probability.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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Robberto, Massim ...
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Gennaro, Mario
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Ubeira Gabellini ...
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Hillenbrand, Lyn ...
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Pacifici, Camill ...
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Ubeda, Leonardo
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Andersen, Morten
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Barman, Travis
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Bellini, Andrea
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Rio, Nicola Da
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De Mink, Selma E ...
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Lodato, Giuseppe
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Manara, Carlo F.
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Platais, Imants
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Pueyo, Laurent
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Strampelli, Giov ...
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Tan, Jonathan, 1 ...
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Testi, L.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Chalmers University of Technology