Query : 2010A&A...517A..76P

2010A&A...517A..76P - Astronomy and Astrophysics, volume 517, A76-76 (2010/7-1)

The highest resolution near infrared spectrum of the imaged planetary mass companion 2M1207b.


Abstract (from CDS):

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 scatttering 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.

Abstract Copyright:

Journal keyword(s): planetary systems - brown dwarfs - planets and satellites: atmospheres - binaries: close - techniques: high angular resolution

VizieR on-line data: <Available at CDS (J/A+A/517/A76): 2m1207b.dat>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 215 0
2 V* V1213 Tau Or* 04 31 37.5055489536 +18 12 24.383952396           K7 540 0
3 V* HK Tau TT* 04 31 50.5715875272 +24 24 17.775307548 16.81 16.689 15.292     M0.5 319 1
4 HD 44627B BD* 06 19 12.9988086984 -58 03 20.198341332           L1 120 1
5 NAME TW Hya Association As* 11 01.9 -34 42           ~ 884 0
6 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 261 0
7 NAME Upper Sco Association As* 16 12 -23.4           ~ 1192 1
8 HD 218396c Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 232 1

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