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The Roasting Marshmallows Program with IGRINS on Gemini South II -- WASP-121 b has super-stellar C/O and refractory-to-volatile ratios by Smith, Peter C. B.; Sanchez, Jorge A.; Line, Michael R.; Rauscher, Emily; Mansfield, Megan Weiner; Kempton, Eliza M. -R.; Savel, Arjun; Wardenier, Joost P.; Pino, Lorenzo; Bean, Jacob L.; Beltz, Hayley; Panwar, Vatsal; Brogi, Matteo; Malsky, Isaac; Fortney, Jonathan; Desert, Jean-Michel; Pelletier, Stefan; Parmentier, Vivien; Kanumalla, Krishna; Welbanks, Luis; Meyer, Michael; Monnier, John is a scholarly article available to read on EtoBox.

What is The Roasting Marshmallows Program with IGRINS on Gemini South II -- WASP-121 b has super-stellar C/O and refractory-to-volatile ratios about?

A primary goal of exoplanet science is to measure the atmospheric composition of gas giants in order to infer their formation and migration histories. Common diagnostics for planet formation are the atmospheric metallicity ([M/H]) and the carbon-to-oxygen (C/O) ratio as measured through transit or emission spectroscopy. The C/O ratio in particular can be used to approximately place a planet's initial formation radius from the stellar host, but a given C/O ratio may not be unique to formation location. This degeneracy can be broken by combining measurements of both the C/O ratio and the atmospheric refractory-to-volatile ratio. We report the measurement of both quantities for the atmosphere of the canonical ultra hot Jupiter WASP-121 b using the high resolution (R=45,000) IGRINS instrument on Gemini South. Probing the planet's direct thermal emission in both pre- and post-secondary eclipse orbital phases, we infer that WASP-121 b has a significantly super-stellar C/O ratio of 0.70$^{+0.07}_{-0.10}$ and a moderately super-stellar refractory-to-volatile ratio at 3.83$^{+3.62}_{-1.67} \times$ stellar. This combination is most consistent with formation between the soot line and H$_2$O s

Author

Smith, Peter C. B.; Sanchez, Jorge A.; Line, Michael R.; Rauscher, Emily; Mansfield, Megan Weiner; Kempton, Eliza M. -R.; Savel, Arjun; Wardenier, Joost P.; Pino, Lorenzo; Bean, Jacob L.; Beltz, Hayley; Panwar, Vatsal; Brogi, Matteo; Malsky, Isaac; Fortney, Jonathan; Desert, Jean-Michel; Pelletier, Stefan; Parmentier, Vivien; Kanumalla, Krishna; Welbanks, Luis; Meyer, Michael; Monnier, John

Published

2024

Language

EN