Exoplanets and Stellar Physics

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Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 514:3 (2022) 4160-4172

Authors:

Rebecca K Webb, Siddharth Gandhi, Matteo Brogi, Jayne L Birkby, Ernst de Mooij, Ignas Snellen, Yapeng Zhang
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A New Analysis of Eight Spitzer Phase Curves and Hot Jupiter Population Trends: Qatar-1b, Qatar-2b, WASP-52b, WASP-34b, and WASP-140b

ASTRONOMICAL JOURNAL 163:6 (2022) ARTN 256

Authors:

EM May, KB Stevenson, Jacob L Bean, Taylor J Bell, Nicolas B Cowan, Lisa Dang, Jean-Michel Desert, Jonathan J Fortney, Dylan Keating, Eliza M-R Kempton, Thaddeus D Komacek, Nikole K Lewis, Megan Mansfield, Caroline Morley, Vivien Parmentier, Emily Rauscher, Mark R Swain, Robert T Zellem, Adam Showman
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A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system

Nature Astronomy Springer Nature 6:6 (2022) 736-750

Authors:

Luisa Maria Serrano, Davide Gandolfi, Alexander J Mustill, Oscar Barragán, Judith Korth, Fei Dai, Seth Redfield, Malcolm Fridlund, Kristine WF Lam, Matías R Díaz, Sascha Grziwa, Karen A Collins, John H Livingston, William D Cochran, Coel Hellier, Salvatore E Bellomo, Trifon Trifonov, Florian Rodler, Javier Alarcon, Jon M Jenkins, David W Latham, George Ricker, Sara Seager, Roland Vanderspeck, Joshua N Winn, Simon Albrecht, Kevin I Collins, Szilárd Csizmadia, Tansu Daylan, Hans J Deeg, Massimiliano Esposito, Michael Fausnaugh, Iskra Georgieva, Elisa Goffo, Eike Guenther, Artie P Hatzes, Steve B Howell, Eric LN Jensen, Rafael Luque, Andrew W Mann, Felipe Murgas, Hannah LM Osborne, Enric Palle, Carina M Persson, Pam Rowden, Alexander Rudat, Alexis MS Smith, Joseph D Twicken, Vincent Van Eylen, Carl Ziegler
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Confirmation of Water Absorption in the Thermal Emission Spectrum of the Hot Jupiter WASP-77Ab with HST/WFC3

The Astronomical Journal American Astronomical Society 163:6 (2022) 261

Authors:

Megan Mansfield, Lindsey Wiser, Kevin B Stevenson, Peter Smith, Michael R Line, Jacob L Bean, Jonathan J Fortney, Vivien Parmentier, Eliza M-R Kempton, Jacob Arcangeli, Jean-Michel Désert, Brian Kilpatrick, Laura Kreidberg, Matej Malik
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Impact of variable photospheric radius on exoplanet atmospheric retrievals

Monthly Notices of the Royal Astronomical Society: Letters 513:1 (2022) L20-L24

Abstract:

Inverse techniques are used to extract information about an exoplanet's atmosphere. These techniques are prone to biased results if the appropriate forward model is not used. One assumption used in a forward model is to assume that the radius of the planet is constant with wavelength; however, a more realistic assumption is that the photospheric radius varies with each wavelength. We explore the bias induced when attempting to extract the molecular abundance from an emission spectrum, which was generated with a variable radius. We find that for low-gravity planets, the retrieval model is not able to fit the data if a constant radius model is used. We find that biased results are obtained when studying a typical hot Jupiter in the MIRI LRS wavelength range. Finally, we show that high-gravity planets do not suffer a bias. We recommend that future spectral retrievals that interpret exoplanet emission spectra should take into account a variable radius.
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