2011A&A...527A..73S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:39:38

2011A&A...527A..73S - Astronomy and Astrophysics, volume 527A, 73-73 (2011/3-1)

Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry.

SING D.K., DESERT J.-M., FORTNEY J.J., LECAVELIER DES ETANGS A., BALLESTER G.E., CEPA J., EHRENREICH D., LOPEZ-MORALES M., PONT F., SHABRAM M. and VIDAL-MADJAR A.

Abstract (from CDS):

We present Gran Telescopio Canarias (GTC) optical transit narrowband photometry of the hot-Jupiter exoplanet XO-2b using the OSIRIS instrument. This unique instrument has the capabilities to deliver high-cadence narrowband photometric lightcurves, allowing us to probe the atmospheric composition of hot Jupiters from the ground. The observations were taken during three transit events that cover four wavelengths at spectral resolutions near 500, necessary for observing atmospheric features, and have near-photon limited sub-mmag precisions. Precision narrowband photometry on a large aperture telescope allows for atmospheric transmission spectral features to be observed for exoplanets around much fainter stars than those of the well studied targets HD 209458b and HD 189733b, providing access to the majority of known transiting planets. For XO-2b, we measure planet-to-star radius contrasts of Rpl/R*=0.10508±0.00052 at 6792Å, 0.10640±0.00058 at 7582Å, and 0.10686±0.00060 at 7664.9Å, and 0.10362±0.00051 at 8839Å. These measurements reveal significant spectral features at two wavelengths, with an absorption level of 0.067±0.016% at 7664.9Å caused by atmospheric potassium in the line core (a 4.1-σ significance level), and an absorption level of 0.058±0.016% at 7582Å, (a 3.6-σ significance level). When comparing our measurements to hot-Jupiter atmospheric models, we find good agreement with models that are dominated in the optical by alkali metals. This is the first evidence for potassium in an extrasolar planet, an element that has along with sodium long been supposed to be a dominant source of opacity at optical wavelengths for hot Jupiters.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: XO-2 - techniques: photometric

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 361 0
2 WASP-12 ** 06 30 32.7966788910 +29 40 20.266334158   12.14 11.57     G0V 229 2
3 BD+50 1471 PM* 07 48 06.4726006390 +50 13 32.921121328   12.002 11.138 10.669 10.243 G9V 140 1
4 BD+50 1471b Pl 07 48 06.4726006390 +50 13 32.921121328           ~ 129 1
5 Kepler-8 Ro* 18 45 09.1489711922 +42 27 03.891516422           F6V 89 1
6 Kepler-4 * 19 02 27.6981397378 +50 08 08.703759444           G0 85 1
7 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 280 2
8 Kepler-7 Er* 19 14 19.5623271934 +41 05 23.365460942           G0 96 1
9 BD+47 2846 Er* 19 28 59.3538131541 +47 58 10.216250846   10.97 10.48     F6V 254 2
10 Kepler-6 Ro* 19 47 20.9379174935 +48 14 23.759506909           ~ 78 1
11 Kepler-5 Ro* 19 57 37.6884816070 +44 02 06.189528905           F5V 87 1
12 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1082 1
13 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 720 1
14 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1468 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:39:38

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