@article{27441c5b8cf747aca18e9412ffb93162,
title = "WASP-52b. The effect of star-spot correction on atmospheric retrievals",
abstract = "We perform atmospheric retrievals on the full optical to infrared (0.3–5 μm) transmission spectrum of the inflated hot Jupiter WASP-52b by combining HST/STIS, WFC3 IR, and Spitzer/IRAC observations. As WASP-52 is an active star that shows both out-of-transit photometric variability and star-spot crossings during transits, we account for the contribution of non-occulted active regions in the retrieval. We recover a 0.1–10× solar atmospheric composition, in agreement with core accretion predictions for giant planets, and no significant contribution of aerosols. We also obtain a <3000 K temperature for the star-spots, a measure which is likely affected by the models used to fit instrumental effects in the transits, and a 5 per cent star-spot fractional coverage, compatible with expectations for the host star{\textquoteright}s spectral type. Such constraints on the planetary atmosphere and on the activity of its host star will inform future JWST GTO observations of this target.",
keywords = "Planets and satellites: atmospheres, Stars: activity, Stars: starspots, Techniques: photometric, Techniques: spectroscopic",
author = "Giovanni Bruno and Lewis, {Nikole K.} and Alam, {Munazza K.} and Mercedes L{\'o}pez-Morales and Barstow, {Joanna K.} and Wakeford, {Hannah R.} and Sing, {David K.} and Henry, {Gregory W.} and Ballester, {Gilda E.} and Vincent Bourrier and Buchhave, {Lars A.} and Ofer Cohen and Thomas Mikal-Evans and Mu{\~n}oz, {Antonio Garc{\'i}a} and Panayotis Lavvas and Jorge Sanz-Forcada",
note = "Funding Information: Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. These observations are associated with program GO 14767 and GO 14260. This research has made use of the SVO Filter Profile Service (http://svo2.cab.inta-csic.es/theory/fps/) supported from the Spanish Ministry of Economy and Competitiveness (MINECO) through grant AYA2017-84089. MKA acknowledges support by the National Science Foundation through a Graduate Research Fellowship. JKB acknowledges the support of a Royal Astronomical Society Research Fellowship. VB acknowledges support by the Swiss National Science Foundation (SNSF) in the frame of the National Centre for Competence in Research ?PlanetS?, and has received funding from the European Research Council (ERC) under the European Union?s Horizon 2020 research and innovation programme (project Four Aces; grant agreement No 724427). AGM acknowledges the support of the Deutsche Forschungsgemeinschaft (DFG) priority program SPP 1992 ?Exploring the Diversity of Extrasolar Planets? (GA 2557/1-1). The authors thank Michael R. Line and Natasha Batalha for their help with the use of CHIMERA. We thank Patrick Irwin for the use of the NEMESIS code and Ryan MacDonald for helpful suggestions on the clarity of the text. Figs B1 and B2 were made with the CORNER.PY package (Foreman-Mackey 2016). Publisher Copyright: {\textcopyright} 2019 The Author(s).",
year = "2020",
month = feb,
day = "1",
doi = "10.1093/mnras/stz3194",
language = "English (US)",
volume = "491",
pages = "5361--5375",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",
}