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Title: NEAR-IR DIRECT DETECTION OF WATER VAPOR IN TAU BOÖTIS b

We use high dynamic range, high-resolution L-band spectroscopy to measure the radial velocity (RV) variations of the hot Jupiter in the τ Boötis planetary system. The detection of an exoplanet by the shift in the stellar spectrum alone provides a measure of the planet's minimum mass, with the true mass degenerate with the unknown orbital inclination. Treating the τ Boo system as a high flux ratio double-lined spectroscopic binary permits the direct measurement of the planet's true mass as well as its atmospheric properties. After removing telluric absorption and cross-correlating with a model planetary spectrum dominated by water opacity, we measure a 6σ detection of the planet at K{sub p} = 111 ± 5 km s{sup –1}, with a 1σ upper limit on the spectroscopic flux ratio of 10{sup –4}. This RV leads to a planetary orbital inclination of i=45{sub −4}{sup +3}° and a mass of M{sub P}=5.90{sub −0.20}{sup +0.35} M{sub Jup}. We report the first detection of water vapor in the atmosphere of a non-transiting hot Jupiter, τ Boo b.
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
  3. Naval Research Laboratory, Washington, DC 20375 (United States)
  4. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22365990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; DETECTION; EMISSION SPECTRA; EMISSION SPECTROSCOPY; INCLINATION; JUPITER PLANET; MASS; OPACITY; RADIAL VELOCITY; RESOLUTION; SATELLITE ATMOSPHERES; VARIATIONS; WATER; WATER VAPOR