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Transmission Spectroscopy of WASP-79b from 0.6 to 5.0 $mu$m | Kristin S. Sotzen
; Kevin B. Stevenson
; David K. Sing
; Brian M. Kilpatrick
; Hannah R. Wakeford
; Joseph C. Filippazzo
; Nikole K. Lewis
; Sarah M. Hörst
; Mercedes López-Morales
; Gregory W. Henry
; Lars A. Buchhave
; David Ehrenreich
; Jonathan D. Fraine
; Antonio García Muñoz
; Rahul Jayaraman
; Panayotis Lavvas
; Alain Lecavelier des Etangs
; Mark S. Marley
; Nikolay Nikolov
; Alexander D. Rathcke
; Jorge Sanz-Forcada
; | Date: |
5 Nov 2019 | Abstract: | As part of the PanCET program, we have conducted a spectroscopic study of
WASP-79b, an inflated hot Jupiter orbiting an F-type star in Eridanus with a
period of 3.66 days. Building on the original WASP and TRAPPIST photometry of
Smalley et al (2012), we examine HST/WFC3 (1.125 - 1.650 $mu$m),
Magellan/LDSS-3C (0.6 - 1 $mu$m) data, and Spitzer data (3.6 and 4.5 $mu$m).
Using data from all three instruments, we constrain the water abundance to be
--2.20 $leq$ log(H$_2$O) $leq$ --1.55. We present these results along with
the results of an atmospheric retrieval analysis, which favor inclusion of FeH
and H$^-$ in the atmospheric model. We also provide an updated ephemeris based
on the Smalley, HST/WFC3, LDSS-3C, Spitzer, and TESS transit times. With the
detectable water feature and its occupation of the clear/cloudy transition
region of the temperature/gravity phase space, WASP-79b is a target of interest
for the approved JWST Director’s Discretionary Early Release Science (DD ERS)
program, with ERS observations planned to be the first to execute in Cycle 1.
Transiting exoplanets have been approved for 78.1 hours of data collection, and
with the delay in the JWST launch, WASP-79b is now a target for the
Panchromatic Transmission program. This program will observe WASP-79b for 42
hours in 4 different instrument modes, providing substantially more data by
which to investigate this hot Jupiter. | Source: | arXiv, 1911.2051 | Services: | Forum | Review | PDF | Favorites |
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