Poster Open Access

Observing planet-starspot crossings with the James Webb Space Telescope

Bruno, Giovanni; Lewis, Nikole K.; Valenti, Jeff; Pagano, Isabella; Fraine, Jonathan; Schlawin, Everett; Lothringer, Joshua; Lanza, Antonino F.; Scandariato, Gaetano; Micela, Giuseppina; Cracchiolo, Gianluca

Transiting exoplanets orbiting active stars frequently occult starspots and faculae on the visible stellar disc. Such occultations can provide useful constraints to retrieve the temperature of active features and their effect on transmission spectra. We analyse the constraints that the James Webb Space Telescope will be able to place on the spectra of starspots, despite its lack of optical wavelength instruments on board. Focusing on K and M spectral types, we find that starspot temperatures can be determined to within a few hundred kelvins using NIRSpec/Prism and the proposed NIRCam/F150W2+F322W2’s broad wavelength capabilities.

GB acknowledges support from CHEOPS ASI-INAF agreement n. 2019-29-HH.0. GM and GC acknowledge the support of the ARIEL ASI-INAF agreement n.2018-22-HH.0. This research has made use of the SVO Filter Profile Service (http://svo2.cab.inta-csic.es/theory/fps/) supported from the Spanish MINECO through grant AYA2017-84089.
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Publication date:
February 26, 2021
DOI:
10.5281/zenodo.4565495

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Keyword(s):
Cool Stars on the main sequence Exoplanets Exoplanet host stars Transmission spectroscopy Starspots
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The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), Virtually anywhere, March 2-4, 2021
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