Access to Astronomical Catalogues

← Click to display the menu
J/A+A/517/A76         Near-IR spectrum of 2M1207b              (Patience+, 2010)

The highest resolution near-infrared spectrum of the imaged planetary mass companion 2M1207b. Patience J., King R.R., De Rosa R.J., Marois C. <Astron. Astrophys. 517, A76 (2010)> =2010A&A...517A..76P
ADC_Keywords: Stars, nearby ; Planets ; Spectra, infrared Keywords: planetary systems - brown dwarfs - planets and satellites: atmospheres - binaries: close - techniques: high angular resolution Abstract: Direct-imaging searches for planets reveal wide orbit planets amenable to spectroscopy, and their atmospheres represent an important comparison to the irradiated atmospheres of Hot Jupiters. Using AO integral field spectroscopy of 2M1207b, the shape of the continuum emission over the J, H, and K bands from the atmosphere of this young, planetary mass companion is measured in order to compare with atmospheric and evolutionary models, and objects of similar temperature in young clusters and the field. The 2M1207b spectrum has the highest spectral resolution (R∼300-1500) and largest wavelength coverage, including the first J-band spectrum, for this benchmark object. The high signal-to-noise of the data allow a clear identification of signatures of low surface gravity, and comparison with a grid of AMES-Dusty models reveals a best-fit effective temperature of Teff=1600K with a preferred surface gravity of logg=4.5. The J-band flux is depressed relative to nearly all L-type objects, and the detailed shape of the absorption features across the H-band exhibit differences from the model predictions. The possible origins of 2M1207b and its low luminosity are examined with the new data and analysis which suggest that extinction from a disk with large grains is a viable scenario and is preferred over scattering off an optically thick disk. The 2M1207b spectrum presents an important comparison for the types of features which may be present in upcoming spectra of the atmospheres of planets imaged in orbit around stellar primaries. Description: Near-IR spectroscopy of the planetary-mass companion to 2M1207. These observations were made with the ESO VLT SINFONI spectrograph. The flux has been scaled by the J and K-band photometry in the J and HK spectral orders. In regions of high telluric absorption the data have been masked and flux set to zero. Objects: --------------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------------- 12 07 33.5 -39 32 54 2M1207 = 2MASSW J1207334-393254 --------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file 2m1207b.dat 25 2491 Near-IR spectrum of 2M1207b
See also: J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006) Byte-by-byte Description of file: 2m1207b.dat
Bytes Format Units Label Explanations
3- 10 F8.6 um lambda [1.088/2.493] Wavelength 16- 25 E10.5 W/m2/um Flux Flux (Flambda)
Acknowledgements: Jenny Patience, patience(at)astro.ex.ac.uk
(End) Patricia Vannier [CDS] 09-Aug-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact