SIMBAD references

2019AJ....157...68B - Astron. J., 157, 68-68 (2019/February-0)

ACCESS: ground-based optical transmission spectroscopy of the hot Jupiter WASP-4b.

BIXEL A., RACKHAM B.V., APAI D., ESPINOZA N., LOPEZ-MORALES M., OSIP D., JORDAN A., McGRUDER C. and WEAVER I.

Abstract (from CDS):

We present an optical transmission spectrum of the atmosphere of WASP-4b obtained through observations of four transits with Magellan/IMACS, as part of the Arizona-CfA-Catolica-Carnegie Exoplanet Spectroscopy Survey (ACCESS). Using a Bayesian approach to atmospheric retrieval, we find no evidence for scattering or absorption features in our transit spectrum. Our models include a component to model the transit light source effect (spectral contamination from unocculted spots on the stellar photosphere), which we show can have a marked impact on the observed transmission spectrum for reasonable spot-covering fractions (<5%); this is the first such analysis for WASP-4b. We are also able to fit for the size and temperature contrast of spots observed during the second and third transits, finding evidence for both small, cool and large, warm spot-like features on the photosphere. Finally, we compare our results to those published by Huitson et al. using Gemini/GMOS and May et al. using IMACS, and we find that our data are in agreement.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: individual WASP-4b - stars: activity - starspots - techniques: spectroscopic

Simbad objects: 6

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2021.04.17-11:27:07

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