期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 463, 期 3, 页码 2922-2931出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw2205
关键词
stars: individual: WASP-52; planetary systems; starspots
资金
- Science and Technology Facilities Council (STFC) studentships
- STFC consolidated grant [ST/L00073, ST/M001350]
- European Union Seventh Framework programme (FP7) [313014]
- STFC [ST/M006492/1, ST/M002012/1, ST/L000733/1, ST/M001350/1, ST/I005773/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000733/1, ST/M000966/1, ST/M002012/1, 1226157, ST/M006492/1, ST/M001350/1, ST/I005773/1] Funding Source: researchfish
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.
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