High-resolution Dayside Spectroscopy of WASP-189 b: Detection of Iron during the GHOST/Gemini South System Verification Run
Abstract With high equilibrium temperatures and tidally locked rotation, ultra-hot Jupiters (UHJs) are unique laboratories within which to probe extreme atmospheric physics and chemistry. In this paper, we present high-resolution dayside spectroscopy of the UHJ WASP-189 b obtained with the new Gemini High-resolution Optical SpecTrograph (GHOST) at the Gemini South Observatory. The observations, which cover 3 hr of post-eclipse orbital phases, were obtained during the instrument’s System Verification run. We detect the planet’s atmosphere via the Doppler cross-correlation technique, and recover a detection of neutral iron in the planet’s dayside atmosphere at a significance of 7.5 σ in the red arm of the data, verifying the presence of a thermal inversion. We also investigate the presence of other species in the atmosphere and discuss the implications of model injection/recovery tests. These results represent the first atmospheric characterization of an exoplanet with GHOST’s high-resolution mode, and demonstrate the potential of this new instrument in detecting and studying ultra-hot exoplanet atmospheres.
Authors
- Chris Simpson (ORCID: https://orcid.org/0000-0001-8589-4055)
- Jeong‐Eun Heo (ORCID: https://orcid.org/0000-0003-2530-3000)
- V. M. Kalari (ORCID: https://orcid.org/0000-0002-4641-2532)
- D. O. Jones (ORCID: https://orcid.org/0000-0002-6230-0151)
- Manuel Gómez-Jiménez
- Peter Smith (ORCID: https://orcid.org/0000-0002-9946-5259)
- J. G. Robertson (ORCID: https://orcid.org/0000-0001-5528-7801)
- Carlos Quiroz (ORCID: https://orcid.org/0000-0001-5558-6297)
- Ernst de Mooij (ORCID: https://orcid.org/0000-0001-6391-9266)
- Alan W. McConnachie (ORCID: https://orcid.org/0000-0003-4666-6564)
- Roque Ruiz-Carmona (ORCID: https://orcid.org/0000-0001-7518-1393)
- Kristin Chiboucas (ORCID: https://orcid.org/0000-0002-9020-5004)
- Michael Ireland (ORCID: https://orcid.org/0000-0002-6194-043X)
- Greg Burley (ORCID: https://orcid.org/0000-0001-7548-5354)
- John Pazder
- Emily Deibert (ORCID: https://orcid.org/0000-0001-9796-2158)
- Eder Martioli (ORCID: https://orcid.org/0000-0002-5084-168X)
- Vinicius M. Placco (ORCID: https://orcid.org/0000-0003-4479-1265)
- J. Thomas-Osip (ORCID: https://orcid.org/0000-0003-1033-4402)
- Trystyn A. M. Berg (ORCID: https://orcid.org/0000-0002-2606-5078)
- Miji Jeong (ORCID: https://orcid.org/0009-0009-7838-7771)
- Ray Jayawardhana (ORCID: https://orcid.org/0000-0001-5349-6853)
- Adam B. Langeveld (ORCID: https://orcid.org/0000-0002-4451-1705)
- Jake D. Turner (ORCID: https://orcid.org/0000-0001-7836-1787)
- Christian R. Hayes (ORCID: https://orcid.org/0000-0003-2969-2445)
- Mitchell E. Young (ORCID: https://orcid.org/0000-0003-0672-7123)
- Kathleen Labrie (ORCID: https://orcid.org/0000-0002-6633-7891)
- Laura Flagg (ORCID: https://orcid.org/0000-0001-6362-0571)
- Susan E. Ridgway (ORCID: https://orcid.org/0000-0002-1539-5477)
- Siyi Xu (ORCID: https://orcid.org/0000-0002-8808-4282)
- R. Gamen (ORCID: https://orcid.org/0000-0002-5227-9627)
- Fletcher Waller (ORCID: https://orcid.org/0000-0003-3247-7121)
- Ruben Diaz
Publication Details
- Journal
- The Astronomical Journal
- Published
- 2024-09-09
- DOI
- https://doi.org/10.3847/1538-3881/ad643f
- Citations
- 4
- Primary Topic
- Astro and Planetary Science
- Type
- article
- Field-Weighted Citation Impact
- 1.33
Funders
- Space Telescope Science Institute
- Fundação de Amparo à Pesquisa do Estado de Minas Gerais
- Natural Sciences and Engineering Research Council of Canada
- Science and Technology Facilities Council
- Ciência sem Fronteiras