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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
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 | |||||||||
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| 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: |
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| 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: |
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