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Diagnosing aerosols in extrasolar giant planets with cross-correlation function of water bands

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Pino, Lorenzo, Ehrenreich, David, Allart, Romain, Lovis, Christophe, Brogi, Matteo, Malik, Matej, Nascimbeni, Valerio, Pepe, Francesco and Piotto, Giampaolo (2018) Diagnosing aerosols in extrasolar giant planets with cross-correlation function of water bands. Astronomy & Astrophysics, 619 . A3. doi:10.1051/0004-6361/201832986

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Official URL: http://dx.doi.org/10.1051/0004-6361/201832986

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Abstract

Transmission spectroscopy with ground-based, high-resolution instruments provides key insight into the composition of exoplanetary atmospheres. Molecules such as water and carbon monoxide have been unambiguously identified in hot gas giants through cross-correlation techniques. A maximum in the cross-correlation function (CCF) is found when the molecular absorption lines in a binary mask or model template match those contained in the planet. Here, we demonstrate how the CCF method can be used to diagnose broadband spectroscopic features such as scattering by aerosols in high-resolution transit spectra. The idea consists in exploiting the presence of multiple water bands from the optical to the near-infrared. We have produced a set of models of a typical hot Jupiter spanning various conditions of temperature and aerosol coverage. We demonstrate that comparing the CCFs of individual water bands for the models constrains the presence and the properties of the aerosol layers. The contrast difference between the CCFs of two bands can reach ~100 ppm, which could be readily detectable with current or upcoming high-resolution stabilized spectrographs spanning a wide spectral range, such as ESPRESSO, CARMENES, HARPS-N+GIANO, HARPS+NIRPS, SPIRou, or CRIRES+.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Outer planets, Planets -- Atmospheres
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: October 2018
Dates:
DateEvent
October 2018Published
16 July 2018Accepted
Volume: 619
Page Range: A3
DOI: 10.1051/0004-6361/201832986
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): Reproduced with permission from Astronomy & Astrophysics, © ESO
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © ESO 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
724427H2020 European Research Councilhttp://dx.doi.org/10.13039/100010663

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