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Author (up) Weaver, I.C.; Lopez-Morales, M.; Espinoza, N.; Rackham, B.V.; Osip, D.J.; Apai, D.; Jordan, A.; Bixel, A.; Lewis, N.K.; Alam, M.K.; Kirk, J.; McGruder, C.; Rodler, F.; Fienco, J. doi  openurl
  Title ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of H2O, but No Evidence of Na or K Type Journal Article
  Year 2020 Publication Astronomical Journal Abbreviated Journal Astron. J.  
  Volume 159 Issue 1 Pages 21 pp  
  Keywords  
  Abstract We present a new ground-based visual transmission spectrum of the hot Jupiter WASP-43b, obtained as part of the ACCESS Survey. The spectrum was derived from four transits observed between 2015 and 2018, with combined wavelength coverage between 5300 and 9000 A and an average photometric precision of 708 ppm in 230 A bins. We perform an atmospheric retrieval of our transmission spectrum combined with literature Hubble Space Telescope/WFC3 observations to search for the presence of clouds/hazes as well as Na, K, H alpha, and H2O planetary absorption and stellar spot contamination over a combined spectral range of 5318-16420 A. We do not detect a statistically significant presence of Na i or K i alkali lines, or H alpha in the atmosphere of WASP-43b. We find that the observed transmission spectrum can be best explained by a combination of heterogeneities on the photosphere of the host star and a clear planetary atmosphere with H2O. This model yields a log evidence of 8.26 0.42 higher than a flat (featureless) spectrum. In particular, the observations marginally favor the presence of large, low-contrast spots over the four ACCESS transit epochs with an average covering fraction T = 132 K 132 K. Within the planet's atmosphere, we recover a log H2O volume mixing ratio of -2.78(-1.47)(+1.38), which is consistent with previous H2O abundance determinations for this planet.  
  Address [Weaver, Ian C.; Lopez-Morales, Mercedes; Alam, Munazza K.; Kirk, James; McGruder, Chima] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA, Email: iweaver@cfa.harvard.edu  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0004-6256 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000519136000001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1168  
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