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CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b

Yan, F. (author)
Univ Sci & Technol China, Dept Astron, Hefei 230026, Peoples R China.;Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.
Nortmann, L. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.
Reiners, A. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.
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Piskunov, Nikolai, professor, 1957- (author)
Uppsala universitet,Teoretisk astrofysik,Observationell astrofysik,Astronomiska observatoriet
Hatzes, A. (author)
Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.
Seemann, U. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.;European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
Shulyak, D. (author)
Inst Astrofis Andalucia CSIC, Glorieta Astron s n, Granada 18008, Spain.
Lavail, Alexis (author)
Uppsala universitet,Observationell astrofysik
Rains, Adam (author)
Uppsala universitet,Institutionen för fysik och astronomi
Cont, D. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.
Rengel, M. (author)
Max Planck Inst Sonnensystemforschung, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Lesjak, F. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.
Nagel, E. (author)
Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany.;Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.;Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany.
Kochukhov, Oleg (author)
Uppsala universitet,Observationell astrofysik,Uppsala Astronomiska Observatorium
Czesla, S. (author)
Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany.;Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany.
Boldt-Christmas, Linn (author)
Uppsala universitet,Observationell astrofysik
Heiter, Ulrike (author)
Uppsala universitet,Teoretisk astrofysik,Observationell astrofysik,Uppsala Astronomiska Observatorium
Smoker, J. V. (author)
European Southern Observ, Alonso Cordova 3107, Santiago, Chile.;UK Astron Technol Ctr, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Scotland.
Rodler, F. (author)
European Southern Observ, Alonso Cordova 3107, Santiago, Chile.
Bristow, P. (author)
European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
Dorn, R. J. (author)
European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
Jung, Y. (author)
European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
Marquart, Thomas, 1978- (author)
Uppsala universitet,Teoretisk astrofysik,Observationell astrofysik
Stempels, H. C. (author)
Uppsala universitet,Uppsala Astronomiska Observatorium,Observationell astrofysik
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Univ Sci & Technol China, Dept Astron, Hefei 230026, Peoples R China;Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany. Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany. (creator_code:org_t)
2023-02-20
2023
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 672
Related links:
https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The dayside atmospheres of ultra-hot Jupiters (UHJs) are predicted to possess temperature inversion layers with extremely high temperatures at high altitudes. We observed the dayside thermal emission spectra of WASP-18b and WASP-76b with the new CRIRES+ high-resolution spectrograph at near-infrared wavelengths. Using the cross-correlation technique, we detected strong CO emission lines in both planets, which confirms the existence of temperature inversions on their dayside hemispheres. The two planets are the first UHJs orbiting F-type stars with CO emission lines detected; previous detections were mostly for UHJs orbiting A-type stars. Evidence of weak H2O emission signals is also found for both planets. We further applied forward-model retrievals on the detected CO lines and retrieved the temperature-pressure profiles along with the CO volume mixing ratios. The retrieved logarithmic CO mixing ratio of WASP-18b (-2.2(-1.5)(+1.4)) is slightly higher than the value predicted by the self-consistent model assuming solar abundance. For WASP-76b, the retrieved CO mixing ratio (-3.6(-1.6)(+1.8)) is broadly consistent with the value of solar abundance. In addition, we included the equatorial rotation velocity (upsilon(eq)) in the retrieval when analyzing the line profile broadening. The obtained upsilon(eq) is 7.0 +/- 2.9 km s(-1) for WASP-18b and 5.2(-3.0)(+2.5) km s(-1) for WASP-76b, which are consistent with the tidally locked rotational velocities.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

planets and satellites
atmospheres
techniques
spectroscopic
individual
WASP-18b
WASP-76b

Publication and Content Type

ref (subject category)
art (subject category)

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