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How Does the Shape of the Stellar Spectrum Affect the Raman Scattering Features in the Albedo of Exoplanets?

Oklopčić, Antonija and Hirata, Christopher M. and Heng, Kevin (2017) How Does the Shape of the Stellar Spectrum Affect the Raman Scattering Features in the Albedo of Exoplanets? Astrophysical Journal, 846 (2). Art. No. 91. ISSN 1538-4357.

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The diagnostic potential of the spectral signatures of Raman scattering, imprinted in planetary albedo spectra at short optical wavelengths, has been demonstrated in research on planets in the solar system, and has recently been proposed as a probe of exoplanet atmospheres, complementary to albedo studies at longer wavelengths. Spectral features caused by Raman scattering offer insight into the properties of planetary atmospheres, such as the atmospheric depth, composition, and temperature, as well as the possibility of detecting and spectroscopically identifying spectrally inactive species, such as H2 and N2, in the visible wavelength range. Raman albedo features, however, depend on both the properties of the atmosphere and the shape of the incident stellar spectrum. Identical planetary atmospheres can produce very different albedo spectra depending on the spectral properties of the host star. Here we present a set of geometric albedo spectra calculated for atmospheres with H_2/He, N_2, and CO_2 composition, irradiated by different stellar types ranging from late A to late K stars. Prominent albedo features caused by Raman scattering appear at different wavelengths for different types of host stars. We investigate how absorption due to the alkali elements sodium and potassium may affect the intensity of Raman features, and we discuss the preferred strategies for detecting Raman features in future observations.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Oklopčić, Antonija0000-0002-9584-6476
Hirata, Christopher M.0000-0002-2951-4932
Heng, Kevin0000-0003-1907-5910
Additional Information:© 2017 American Astronomical Society. Received 2017 May 18; revised 2017 August 8; accepted 2017 August 11; published 2017 September 5. A.O. acknowledges support from an Institute for Theory and Computation Fellowship. A.O. and C.M.H. were supported by NASA, the U.S. Department of Energy, the David & Lucile Packard Foundation, and the Simons Foundation. K.H. acknowledges support from the Swiss National Science Foundation, the PlanetS NCCR, and the MERAC Foundation. Software: disort (Stamnes et al. 1988).
Funding AgencyGrant Number
Institute for Theory and Computation FellowshipUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
Subject Keywords:molecular processes – planets and satellites: atmospheres – radiative transfer – scattering – techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20170905-143039960
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Official Citation:Antonija Oklopčić et al 2017 ApJ 846 91
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81150
Deposited By: Tony Diaz
Deposited On:05 Sep 2017 22:02
Last Modified:03 Oct 2019 18:39

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