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Constraining Exoplanet Metallicities and Aerosols with ARIEL: An Independent Study by the Contribution to ARIEL Spectroscopy of Exoplanets (CASE) Team

Zellem, Robert T. and Swain, Mark R. and Cowan, Nicolas B. and Bryden, Geoffrey and Komacek, Thaddeus D. and Colavita, Mark and Ardila, David and Roudier, Gael M. and Fortney, Jonathan J. and Bean, Jacob and Line, Michael R. and Griffith, Caitlin A. and Shkolnik, Evgenya L. and Kreidberg, Laura and Moses, Julianne I. and Showman, Adam P. and Stevenson, Kevin B. and Wong, Andre and Chapman, John W. and Ciardi, David R. and Howard, Andrew W. and Kataria, Tiffany and Kempton, Eliza M.-R. and Latham, David and Mahadevan, Suvrath and Meléndez, Jorge and Parmentier, Vivien (2019) Constraining Exoplanet Metallicities and Aerosols with ARIEL: An Independent Study by the Contribution to ARIEL Spectroscopy of Exoplanets (CASE) Team. . (Unpublished)

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Launching in 2028, ESA's Atmospheric Remote-sensing Exoplanet Large-survey (ARIEL) survey of ∼1000 transiting exoplanets will build on the legacies of Kepler and TESS and complement JWST by placing its high precision exoplanet observations into a large, statistically-significant planetary population context. With continuous 0.5--7.8~μm coverage from both FGS (0.50--0.55, 0.8--1.0, and 1.0--1.2~μm photometry; 1.25--1.95~μm spectroscopy) and AIRS (1.95--7.80~μm spectroscopy), ARIEL will determine atmospheric compositions and probe planetary formation histories during its 3.5-year mission. NASA's proposed Contribution to ARIEL Spectroscopy of Exoplanets (CASE) would be a subsystem of ARIEL's FGS instrument consisting of two visible-to-infrared detectors, associated readout electronics, and thermal control hardware. FGS, to be built by the Polish Academy of Sciences' Space Research Centre, will provide both fine guiding and visible to near-infrared photometry and spectroscopy, providing powerful diagnostics of atmospheric aerosol contribution and planetary albedo, which play a crucial role in establishing planetary energy balance. The CASE team presents here an independent study of the capabilities of ARIEL to measure exoplanetary metallicities, which probe the conditions of planet formation, and FGS to measure scattering spectral slopes, which indicate if an exoplanet has atmospheric aerosols (clouds and hazes), and geometric albedos, which help establish planetary climate. Our design reference mission simulations show that ARIEL could measure the mass-metallicity relationship of its 1000-planet single-visit sample to >7.5σ and that FGS could distinguish between clear, cloudy, and hazy skies and constrain an exoplanet's atmospheric aerosol composition to >5σ for hundreds of targets, providing statistically-transformative science for exoplanet atmospheres.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Zellem, Robert T.0000-0001-7547-0398
Cowan, Nicolas B.0000-0001-6129-5699
Fortney, Jonathan J.0000-0002-9843-4354
Bean, Jacob0000-0003-4733-6532
Line, Michael R.0000-0002-2338-476X
Shkolnik, Evgenya L.0000-0002-7260-5821
Stevenson, Kevin B.0000-0002-7352-7941
Ciardi, David R.0000-0002-5741-3047
Howard, Andrew W.0000-0001-8638-0320
Kataria, Tiffany0000-0003-3759-9080
Kempton, Eliza M.-R.0000-0002-1337-9051
Latham, David0000-0001-9911-7388
Mahadevan, Suvrath0000-0001-9596-7983
Meléndez, Jorge0000-0002-4933-2239
Parmentier, Vivien0000-0001-9521-6258
Additional Information:Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Copyright 2018. All rights reserved. We thank the JPL Exoplanet Science Initiative for partial support of this work. We thank the anonymous referee for their helpful comments. RTZ would like to thank Giovanna Tinetti, Enzo Pascale, and Ingo Waldmann for their helpful discussions about the ARIEL mission. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program.
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Record Number:CaltechAUTHORS:20190617-160618750
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96490
Deposited By: Tony Diaz
Deposited On:17 Jun 2019 23:15
Last Modified:17 Jun 2019 23:15

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