2015A&A...582A..51C


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.19CEST10:56:11

2015A&A...582A..51C - Astronomy and Astrophysics, volume 582A, 51-51 (2015/10-1)

The center-to-limb variation across the Fraunhofer lines of HD 189733. Sampling the stellar spectrum using a transiting planet.

CZESLA S., KLOCOVA T., KHALAFINEJAD S., WOLTER U. and SCHMITT J.H.M.M.

Abstract (from CDS):

The center-to-limb variation (CLV) describes the brightness of the stellar disk as a function of the limb angle. Across strong absorption lines, the CLV can vary quite significantly. We obtained a densely sampled time series of high-resolution transit spectra of the active planet host star HD 189733 with UVES. Using the passing planetary disk of the hot Jupiter HD 189733b as a probe, we study the CLV in the wings of the CaII H and K and NaI D1 and D2 Fraunhofer lines, which are not strongly affected by activity-induced variability. In agreement with model predictions, our analysis shows that the wings of the studied Fraunhofer lines are limb brightened with respect to the (quasi-)continuum. The strength of the CLV-induced effect can be on the same order as signals found for hot Jupiter atmospheres. Therefore, a careful treatment of the wavelength dependence of the stellar CLV in strong absorption lines is highly relevant in the interpretation of planetary transit spectroscopy.

Abstract Copyright:

Journal keyword(s): planets and satellites: individual: HD 189733b - planets and satellites: atmospheres - stars: activity - stars: atmospheres

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 475 1
2 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 987 1
3 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K0V+M4V 681 1
4 V* V376 Peg EP* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 965 1
5 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1373 1
6 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 477 1

    Equat.    Gal    SGal    Ecl

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2019.08.19-10:56:11

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