PHOTOCHEMISTRY IN TERRESTRIAL EXOPLANET ATMOSPHERES. I. PHOTOCHEMISTRY MODEL AND BENCHMARK CASES
We present a comprehensive photochemistry model for exploration of the chemical composition of terrestrial exoplanet atmospheres. We validate the model by computing the atmospheric composition of current Earth and Mars and find agreement with observations of major trace gases in Earth's and Mar...
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| Veröffentlicht in: | The Astrophysical journal 2012-12, Vol.761 (2), p.1-29 |
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| container_title | The Astrophysical journal |
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| creator | RENYU HU SEAGER, Sara BAINS, William |
| description | We present a comprehensive photochemistry model for exploration of the chemical composition of terrestrial exoplanet atmospheres. We validate the model by computing the atmospheric composition of current Earth and Mars and find agreement with observations of major trace gases in Earth's and Mars' atmospheres. We simulate several plausible atmospheric scenarios of terrestrial exoplanets and choose three benchmark cases for atmospheres from reducing to oxidizing. The most interesting finding is that atomic hydrogen is always a more abundant reactive radical than the hydroxyl radical in anoxic atmospheres. Whether atomic hydrogen is the most important removal path for a molecule of interest also depends on the relevant reaction rates. The atmospheric scenarios presented in this paper can serve as the benchmark atmospheres for quickly assessing the lifetime of trace gases in reducing, weakly oxidizing, and highly oxidizing atmospheres on terrestrial exoplanets for the exploration of possible biosignature gases. |
| doi_str_mv | 10.1088/0004-637x/761/2/166 |
| format | Article |
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Whether atomic hydrogen is the most important removal path for a molecule of interest also depends on the relevant reaction rates. 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I. PHOTOCHEMISTRY MODEL AND BENCHMARK CASES</title><title>The Astrophysical journal</title><description>We present a comprehensive photochemistry model for exploration of the chemical composition of terrestrial exoplanet atmospheres. We validate the model by computing the atmospheric composition of current Earth and Mars and find agreement with observations of major trace gases in Earth's and Mars' atmospheres. We simulate several plausible atmospheric scenarios of terrestrial exoplanets and choose three benchmark cases for atmospheres from reducing to oxidizing. The most interesting finding is that atomic hydrogen is always a more abundant reactive radical than the hydroxyl radical in anoxic atmospheres. Whether atomic hydrogen is the most important removal path for a molecule of interest also depends on the relevant reaction rates. The atmospheric scenarios presented in this paper can serve as the benchmark atmospheres for quickly assessing the lifetime of trace gases in reducing, weakly oxidizing, and highly oxidizing atmospheres on terrestrial exoplanets for the exploration of possible biosignature gases.</description><subject>Astronomy</subject><subject>ASTROPHYSICS</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Atmospheres</subject><subject>Atmospherics</subject><subject>Benchmarking</subject><subject>BENCHMARKS</subject><subject>CARBON DIOXIDE</subject><subject>CHEMICAL COMPOSITION</subject><subject>Earth</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Extrasolar planets</subject><subject>HYDROGEN</subject><subject>HYDROXYL RADICALS</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>METHANE</subject><subject>MOLECULES</subject><subject>OXYGEN</subject><subject>OZONE</subject><subject>Photochemistry</subject><subject>PHOTOSYNTHESIS</subject><subject>PLANETARY ATMOSPHERES</subject><subject>RADIANT HEAT TRANSFER</subject><subject>SATELLITE ATMOSPHERES</subject><subject>Trace gases</subject><subject>VALENCE</subject><subject>VELOCITY</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqNkU1Lw0AQhhdRsH78Ai8LInhJu1_ZTY4xriaYNqWNoKd1u93FSG1qNoL-e1OqHjx5Gt6Z552BeQE4w2iIURSNEEIs4FR8jATHIzLCnO-BAQ5pFDAain0w-CEeDsGR9y9bSeJ4AJ6mWVmVaSbH-byaPcJ8Ais5m8le5EkB5UM5LZKJrGBSjcv5NJP9aAjzIfzjG5fXsoDJ5BpeyUmajZPZHUyTuZyfgAOnV96eftdjcH8jqzQLivI2T5Mi0CESXRAaLpYL6wwS1mGmY44Ft5Q5bAVikVj0HW5DjmO8YIuQxEI7x5aRo4ixZSzoMTjf7W18Vytv6s6aZ9Os19Z0ihDMKCekpy531KZt3t6t79Rr7Y1drfTaNu9eYUEREozh-B8oJiGnhLAepTvUtI33rXVq09avuv1UGKltQGr7b7V9v-oDUkT1AfWui-8D2hu9cq1em9r_WgkXISEiol9P4Yae</recordid><startdate>20121220</startdate><enddate>20121220</enddate><creator>RENYU HU</creator><creator>SEAGER, Sara</creator><creator>BAINS, William</creator><general>IOP</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TV</scope><scope>C1K</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20121220</creationdate><title>PHOTOCHEMISTRY IN TERRESTRIAL EXOPLANET ATMOSPHERES. 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PHOTOCHEMISTRY MODEL AND BENCHMARK CASES</title><author>RENYU HU ; SEAGER, Sara ; BAINS, William</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a507t-5c67dbefc07ef14a96176e34f1e70487ba966e56191b4b5297aff4d8f3044d973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Astronomy</topic><topic>ASTROPHYSICS</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Atmospheres</topic><topic>Atmospherics</topic><topic>Benchmarking</topic><topic>BENCHMARKS</topic><topic>CARBON DIOXIDE</topic><topic>CHEMICAL COMPOSITION</topic><topic>Earth</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Extrasolar planets</topic><topic>HYDROGEN</topic><topic>HYDROXYL RADICALS</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>METHANE</topic><topic>MOLECULES</topic><topic>OXYGEN</topic><topic>OZONE</topic><topic>Photochemistry</topic><topic>PHOTOSYNTHESIS</topic><topic>PLANETARY ATMOSPHERES</topic><topic>RADIANT HEAT TRANSFER</topic><topic>SATELLITE ATMOSPHERES</topic><topic>Trace gases</topic><topic>VALENCE</topic><topic>VELOCITY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>RENYU HU</creatorcontrib><creatorcontrib>SEAGER, Sara</creatorcontrib><creatorcontrib>BAINS, William</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Pollution Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>RENYU HU</au><au>SEAGER, Sara</au><au>BAINS, William</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>PHOTOCHEMISTRY IN TERRESTRIAL EXOPLANET ATMOSPHERES. I. PHOTOCHEMISTRY MODEL AND BENCHMARK CASES</atitle><jtitle>The Astrophysical journal</jtitle><date>2012-12-20</date><risdate>2012</risdate><volume>761</volume><issue>2</issue><spage>1</spage><epage>29</epage><pages>1-29</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>We present a comprehensive photochemistry model for exploration of the chemical composition of terrestrial exoplanet atmospheres. We validate the model by computing the atmospheric composition of current Earth and Mars and find agreement with observations of major trace gases in Earth's and Mars' atmospheres. We simulate several plausible atmospheric scenarios of terrestrial exoplanets and choose three benchmark cases for atmospheres from reducing to oxidizing. The most interesting finding is that atomic hydrogen is always a more abundant reactive radical than the hydroxyl radical in anoxic atmospheres. Whether atomic hydrogen is the most important removal path for a molecule of interest also depends on the relevant reaction rates. The atmospheric scenarios presented in this paper can serve as the benchmark atmospheres for quickly assessing the lifetime of trace gases in reducing, weakly oxidizing, and highly oxidizing atmospheres on terrestrial exoplanets for the exploration of possible biosignature gases.</abstract><cop>Bristol</cop><pub>IOP</pub><doi>10.1088/0004-637x/761/2/166</doi><tpages>29</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Astronomy ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Atmospheres Atmospherics Benchmarking BENCHMARKS CARBON DIOXIDE CHEMICAL COMPOSITION Earth Earth, ocean, space Exact sciences and technology Extrasolar planets HYDROGEN HYDROXYL RADICALS INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY METHANE MOLECULES OXYGEN OZONE Photochemistry PHOTOSYNTHESIS PLANETARY ATMOSPHERES RADIANT HEAT TRANSFER SATELLITE ATMOSPHERES Trace gases VALENCE VELOCITY |
| title | PHOTOCHEMISTRY IN TERRESTRIAL EXOPLANET ATMOSPHERES. I. PHOTOCHEMISTRY MODEL AND BENCHMARK CASES |
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