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Daylan, Tansu; Günther, Maximilian N.; Mikal-Evans, Thomas; Sing, David K.; Wong, Ian; Shporer, Avi; Niraula, Prajwal; Wit, Julien de; Koll, Daniel D. B.; Parmentier, Vivien; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland; Seager, S.; Winn, Joshua N.; Jenkins, Jon M.; Caldwell, Douglas A.; Charbonneau, David; Henze, Christopher E.; Paegert, Martin; Rinehart, Stephen; Rose, Mark; Sha, Lizhou; [...]

TESS Observations of the WASP-121 b Phase Curve

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  • Media type: E-Article
  • Title: TESS Observations of the WASP-121 b Phase Curve
  • Contributor: Daylan, Tansu; Günther, Maximilian N.; Mikal-Evans, Thomas; Sing, David K.; Wong, Ian; Shporer, Avi; Niraula, Prajwal; Wit, Julien de; Koll, Daniel D. B.; Parmentier, Vivien; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland; Seager, S.; Winn, Joshua N.; Jenkins, Jon M.; Caldwell, Douglas A.; Charbonneau, David; Henze, Christopher E.; Paegert, Martin; Rinehart, Stephen; Rose, Mark; Sha, Lizhou; [...]
  • imprint: American Astronomical Society, 2021
  • Published in: The Astronomical Journal
  • Language: Not determined
  • DOI: 10.3847/1538-3881/abd8d2
  • ISSN: 0004-6256; 1538-3881
  • Keywords: Space and Planetary Science ; Astronomy and Astrophysics
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title> <jats:p>We study the red-optical photometry of the ultrahot Jupiter WASP-121 b as observed by the Transiting Exoplanet Survey Satellite (TESS) and model its atmosphere through a radiative transfer simulation. Given its short orbital period of ∼1.275 days, inflated state, and bright host star, WASP-121 b is exceptionally favorable for detailed atmospheric characterization. Toward this purpose, we use <jats:monospace>allesfitter</jats:monospace> to characterize its full red-optical phase curve, including the planetary phase modulation and secondary eclipse. We measure the day- and nightside brightness temperatures in the TESS passband as <jats:inline-formula> <jats:tex-math> <?CDATA ${3012}_{-42}^{+40}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajabd8d2ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math> <?CDATA ${2022}_{-602}^{+254}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ajabd8d2ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> K, respectively, and do not find a statistically significant phase shift between the brightest and substellar points. This is consistent with inefficient heat recirculation on the planet. We then perform an atmospheric retrieval analysis to infer the dayside atmospheric properties of WASP-121 b, such as its bulk composition, albedo, and heat recirculation. We confirm the temperature inversion in the atmosphere and suggest H<jats:sup>−</jats:sup>, TiO, and VO as potential causes of the inversion, absorbing heat at optical wavelengths at low pressures. Future Hubble Space Telescope and James Webb Space Telescope observations of WASP-121 b will benefit from its first full phase curve measured by TESS.</jats:p>
  • Access State: Open Access