SIMBAD references

2016MNRAS.463.2922K - Mon. Not. R. Astron. Soc., 463, 2922-2931 (2016/December-2)

Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface.

KIRK J., WHEATLEY P.J., LOUDEN T., LITTLEFAIR S.P., COPPERWHEAT C.M., ARMSTRONG D.J., MARSH T.R. and DHILLON V.S.

Abstract (from CDS):

We have measured the transmission spectrum of the extremely inflated hot Jupiter WASP-52b using simultaneous photometric observations in Sloan Digital Sky Survey u', g' and a filter centred on the sodium doublet (Na I) with the ULTRACAM instrument mounted on the 4.2-m William Herschel Telescope. We find that Rayleigh scattering is not the dominant source of opacity within the planetary atmosphere and find a transmission spectrum more consistent with wavelength-independent opacity such as from clouds. We detect an in-transit anomaly that we attribute to the presence of stellar activity and find that this feature can be more simply modelled as a bright region on the stellar surface akin to solar faculae rather than spots. A spot model requires a significantly larger planet/star radius ratio than that found in previous studies. Our results highlight the precision that can be achieved by ground-based photometry with errors in the scaled planetary radii of less than one atmospheric scale height, comparable to Hubble Space Telescope observations.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: individual: WASP-52 - planetary systems - starspots - starspots

Simbad objects: 21

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2022.08.18-00:20:12

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