Journal
ASTROPHYSICAL JOURNAL
Volume 744, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/744/1/35
Keywords
methods: data analysis; planets and satellites: atmospheres; planets and satellites: individual (HD 189733b); techniques: spectroscopic
Categories
Funding
- STFC
- Science and Technology Facilities Council [ST/K001612/1] Funding Source: researchfish
- STFC [ST/K001612/1] Funding Source: UKRI
Ask authors/readers for more resources
We investigate the K- and L-band dayside emission of the hot-Jupiter HD 189733b with three nights of secondary eclipse data obtained with the SpeX instrument on the NASA Infrared Telescope Facility. The observations for each of these three nights use equivalent instrument settings and the data from one of the nights have previously been reported by Swain et al. We describe an improved data analysis method that, in conjunction with themulti-night data set, allows increased spectral resolution (R similar to 175) leading to high-confidence identification of spectral features. We confirm the previously reported strong emission at similar to 3.3 mu m and, by assuming a 5% vibrational temperature excess for methane, we show that non-LTE emission from the methane nu(3) branch is a physically plausible source of this emission. We consider two possible energy sources that could power non-LTE emission and additional modeling is needed to obtain a detailed understanding of the physics of the emission mechanism. The validity of the data analysis method and the presence of strong 3.3 mu m emission are independently confirmed by simultaneous, long-slit, L-band spectroscopy of HD 189733b and a comparison star.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available