2014ApJ...794L..15I

Query : 2014ApJ...794L..15I

2014ApJ...794L..15I - Astrophys. J., 794, L15 (2014/October-2)

Gemini planet imager spectroscopy of the HR 8799 planets c and d.

INGRAHAM P., MARLEY M.S., SAUMON D., MAROIS C., MACINTOSH B., BARMAN T., BAUMAN B., BURROWS A., CHILCOTE J.K., DE ROSA R.J., DILLON D., DOYON R., DUNN J., ERIKSON D., FITZGERALD M.P., GAVEL D., GOODSELL S.J., GRAHAM J.R., HARTUNG M., HIBON P., KALAS P.G., KONOPACKY Q., LARKIN J.A., MAIRE J., MARCHIS F., McBRIDE J., MILLAR-BLANCHAER M., MORZINSKI K.M., NORTON A., OPPENHEIMER R., PALMER D.W., PATIENCE J., PERRIN M.D., POYNEER L.A., PUEYO L., RANTAKYRO F., SADAKUNI N., SADDLEMYER L., SAVRANSKY D., SOUMMER R., SIVARAMAKRISHNAN A., SONG I., THOMAS S., WALLACE J.K., WIKTOROWICZ S.J. and WOLFF S.G.

Abstract (from CDS):

During the first-light run of the Gemini Planet Imager we obtained K-band spectra of exoplanets HR 8799 c and d. Analysis of the spectra indicates that planet d may be warmer than planet c. Comparisons to recent patchy cloud models and previously obtained observations over multiple wavelengths confirm that thick clouds combined with horizontal variation in the cloud cover generally reproduce the planets' spectral energy distributions. When combined with the 3 to 4 µm photometric data points, the observations provide strong constraints on the atmospheric methane content for both planets. The data also provide further evidence that future modeling efforts must include cloud opacity, possibly including cloud holes, disequilibrium chemistry, and super-solar metallicity.

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Journal keyword(s): infrared: planetary systems - instrumentation: adaptive optics - instrumentation: high angular resolution - planets and satellites: atmospheres - planets and satellites: gaseous planets - techniques: imaging spectroscopy

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 218396c Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 312 1
2 HD 218396b Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 323 1
3 HD 218396d Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 286 1
4 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1285 0

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