Radial velocity survey for planets around young stars (RVSPY): A transiting warm super-Jovian planet around HD 114082, a young star with a debris disk

Olga V. Zakhozhay, Ralf Launhardt, Trifon Trifonov, Martin Kürster, Sabine Reffert, Thomas Henning, Rafael Brahm, José I. Vinés, Gabriel Dominique Marleau, Jayshil A. Patel

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Aims. We aim to detect planetary companions to young stars with debris disks via the radial velocity method. Methods. We observed HD 114082 during April 2018- August 2022 as one of the targets of our RVSPY program (Radial Velocity Survey for Planets around Young stars). We use the FEROS spectrograph, mounted to the MPG/ESO 2.2 m telescope in Chile, to obtain high signal-to-noise spectra and time series of precise radial velocities (RVs). Additionally, we analyze archival HARPS spectra and TESS photometric data. We use the CERES, CERES++ and SERVAL pipelines to derive RVs and activity indicators and ExoStriker for the independent and combined analysis of the RVs and TESS photometry. Results. We report the discovery of a warm super-Jovian companion around HD 114082 based on a 109.8±0.4 day signal in the combined RV data from FEROS and HARPS, and on one transit event in the TESS photometry. The best-fit model indicates a 8.0±1.0 MJup companion with a radius of 1.00±0.03RJup in an orbit with a semi-major axis of 0.51±0.01 au and an eccentricity of 0.4±0.04. The companions orbit is in agreement with the known near edge-on debris disk located at 28 au. HD 114082 b is possibly the youngest (15±6 Myr), and one of only three young (< 100 Myr) giant planetary companions for which both their mass and radius have been determined observationally. It is probably the first properly model-constraining giant planet that allows distinguishing between hot and cold-start models. It is significantly more compatible with the cold-start model.

Original languageEnglish
Article numberL14
JournalAstronomy and Astrophysics
Volume667
Issue number102
DOIs
StatePublished - 1 Nov 2022
Externally publishedYes

Keywords

  • Methods: observational
  • Planets and satellites: detection
  • Planets and satellites: formation
  • Stars: activity
  • Techniques: photometric
  • Techniques: radial velocities

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