Evidence that the Hot Jupiter WASP-77 A b Formed Beyond Its Parent Protoplanetary Disk’s H2O Ice Line

Idealized protoplanetary disk and giant planet formation models have been interpreted to suggest that a giant planet’s atmospheric abundances can be used to infer its formation location in its parent protoplanetary disk. It has recently been reported that the hot Jupiter WASP-77 A b has subsolar atm...

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Veröffentlicht in:The Astronomical journal Jg. 163; H. 4; S. 159 - 169
Hauptverfasser: Reggiani, Henrique, Schlaufman, Kevin C., Healy, Brian F., Lothringer, Joshua D., Sing, David K.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Madison The American Astronomical Society 01.04.2022
IOP Publishing
Schlagworte:
Abundance
Accretion disks
Astronomy
ASTRONOMY AND ASTROPHYSICS
Atmospheric models
Carbon
Deposition
Exoplanet astronomy
Exoplanet atmospheric composition
Exoplanet formation
Exoplanet migration
Exoplanet systems
Exoplanet tides
Extrasolar planets
Gas giant planets
Hot Jupiters
Jupiter
Oxygen
Photosphere
Planet formation
Planet hosting stars
Planets
Protoplanetary disks
Space telescopes
Star-planet interactions
Stellar abundances
ISSN:0004-6256, 1538-3881
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Zusammenfassung:Idealized protoplanetary disk and giant planet formation models have been interpreted to suggest that a giant planet’s atmospheric abundances can be used to infer its formation location in its parent protoplanetary disk. It has recently been reported that the hot Jupiter WASP-77 A b has subsolar atmospheric carbon and oxygen abundances with a solar C/O abundance ratio. Assuming solar carbon and oxygen abundances for its host star WASP-77 A, WASP-77 A b’s atmospheric carbon and oxygen abundances possibly indicate that it accreted its envelope interior to its parent protoplanetary disk’s H 2 O ice line from carbon-depleted gas with little subsequent planetesimal accretion or core erosion. We show that the photospheric abundances of carbon and oxygen in WASP-77 A are supersolar with a subsolar C/O abundance ratio, implying that WASP-77 A b’s atmosphere has significantly substellar carbon and oxygen abundances with a superstellar C/O ratio. Our result possibly indicates that WASP-77 A b’s envelope was accreted by the planet beyond its parent protoplanetary disk's H 2 O ice line. While numerous theoretical complications to these idealized models have now been identified, the possibility of nonsolar protoplanetary disk abundance ratios confound even the most sophisticated protoplanetary disk and giant planet formation models. We therefore argue that giant planet atmospheric abundance ratios can only be meaningfully interpreted relative to the possibly nonsolar mean compositions of their parent protoplanetary disks as recorded in the photospheric abundances of their dwarf host stars.
Bibliographie:The Solar System, Exoplanets, and Astrobiology
AAS36882
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
USDOE Office of Science (SC)
National Science Foundation (NSF)
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ac4d9f