NEAR-IR direct detection of water vapor in tau Boötis b

Alexandra C. Lockwood, John A. Johnson, Chad F. Bender, John S. Carr, Travis S Barman, Alexander J W Richert, Geoffrey A. Blake

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

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 Kp = 111 ± 5 km s-1, with a 1σ upper limit on the spectroscopic flux ratio of 10-4. This RV leads to a planetary orbital inclination of i = 45+3-4° and a mass of Mp = 5.90+0.35-0.20 MJup. We report the first detection of water vapor in the atmosphere of a non-transiting hot Jupiter, τ Boo b.

Original languageEnglish (US)
Article numberL29
JournalAstrophysical Journal Letters
Volume783
Issue number2
DOIs
StatePublished - Mar 10 2014

Fingerprint

water vapor
planets
planet
Jupiter (planet)
Jupiter
radial velocity
inclination
stellar spectra
orbitals
planetary systems
ultrahigh frequencies
extrasolar planets
opacity
dynamic range
spectroscopy
atmospheres
detection
atmosphere
shift
high resolution

Keywords

  • atmospheres - techniques
  • planets and satellites
  • spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Lockwood, A. C., Johnson, J. A., Bender, C. F., Carr, J. S., Barman, T. S., Richert, A. J. W., & Blake, G. A. (2014). NEAR-IR direct detection of water vapor in tau Boötis b. Astrophysical Journal Letters, 783(2), [L29]. https://doi.org/10.1088/2041-8205/783/2/L29

NEAR-IR direct detection of water vapor in tau Boötis b. / Lockwood, Alexandra C.; Johnson, John A.; Bender, Chad F.; Carr, John S.; Barman, Travis S; Richert, Alexander J W; Blake, Geoffrey A.

In: Astrophysical Journal Letters, Vol. 783, No. 2, L29, 10.03.2014.

Research output: Contribution to journalArticle

Lockwood, AC, Johnson, JA, Bender, CF, Carr, JS, Barman, TS, Richert, AJW & Blake, GA 2014, 'NEAR-IR direct detection of water vapor in tau Boötis b', Astrophysical Journal Letters, vol. 783, no. 2, L29. https://doi.org/10.1088/2041-8205/783/2/L29
Lockwood AC, Johnson JA, Bender CF, Carr JS, Barman TS, Richert AJW et al. NEAR-IR direct detection of water vapor in tau Boötis b. Astrophysical Journal Letters. 2014 Mar 10;783(2). L29. https://doi.org/10.1088/2041-8205/783/2/L29
Lockwood, Alexandra C. ; Johnson, John A. ; Bender, Chad F. ; Carr, John S. ; Barman, Travis S ; Richert, Alexander J W ; Blake, Geoffrey A. / NEAR-IR direct detection of water vapor in tau Boötis b. In: Astrophysical Journal Letters. 2014 ; Vol. 783, No. 2.
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