Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39

Author:

Flagg LauraORCID,Weinberger Alycia J.ORCID,Bell Taylor J.ORCID,Welbanks LuisORCID,Morello GiuseppeORCID,Powell DianaORCID,Bean Jacob L.ORCID,Blecic JasminaORCID,Crouzet NicolasORCID,Gao PeterORCID,Inglis JulieORCID,Kirk JamesORCID,López-Morales MercedesORCID,Molaverdikhani KaranORCID,Nikolov NikolayORCID,Oza Apurva V.ORCID,Rackham Benjamin V.ORCID,Redfield SethORCID,Tsai Shang-MinORCID,Jayawardhana RayORCID,Kreidberg LauraORCID,Nixon Matthew C.ORCID,Stevenson Kevin B.ORCID,Turner Jake D.ORCID

Abstract

Abstract The signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change the observed transmission spectrum for any planet in the system. The MIRI/Low Resolution Spectrometer WASP-39b transmission spectrum shows an unexplained dip starting at ∼10 μm that could be caused by astrophysical contamination. The spectral energy distribution displays excess flux at similar levels to that which are needed to create the dip in the transmission spectrum. In this Letter, we show that this dip is consistent with the presence of a bright circumstellar debris disk, at a distance of >2 au. We discuss how a circumstellar debris disk like that could affect the atmosphere of WASP-39b. We also show that even faint debris disks can be a source of contamination in MIRI exoplanet spectra.

Funder

WBS

Publisher

American Astronomical Society

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