2017A&A...598L...3C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:22:18

2017A&A...598L...3C - Astronomy and Astrophysics, volume 598, L3-3 (2017/2-1)

A cautionary tale: limitations of a brightness-based spectroscopic approach to chromatic exoplanet radii.

CEGLA H.M., LOVIS C., BOURRIER V., WATSON C.A. and WYTTENBACH A.

Abstract (from CDS):

Determining wavelength-dependent exoplanet radii measurements is an excellent way to probe the composition of exoplanet atmospheres. In light of this, Borsa et al. (2016A&A...590A..84B) sought to develop a technique to obtain such measurements by comparing ground-based transmission spectra to the expected brightness variations during an exoplanet transit. However, we demonstrate herein that this is not possible due to the transit light curve normalisation necessary to remove the effects of the Earth's atmosphere on the ground-based observations. This is because the recoverable exoplanet radius is set by the planet-to-star radius ratio within the transit light curve; we demonstrate this both analytically and with simulated planet transits, as well as through a reanalysis of the HD 189733 b data.

Abstract Copyright: © ESO, 2017

Journal keyword(s): methods: data analysis - planets and satellites: atmospheres - planets and satellites: fundamental parameters - planets and satellites: individual: HD 189733 b - techniques: radial velocities - techniques: spectroscopic

Simbad objects: 2

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Number of rows : 2

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 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 720 1
2 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1082 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:22:18

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