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Extrasolar planets

Breakthrough in Exoplanet Research: New Findings on HIP 99770 b

Strategic Insights

— 1 min read

Investigators at the University of Texas San Antonio have made a significant discovery in the study of exoplanets, revealing new insights into the superjovian exoplanet HIP 99770 b. This research, supported by the National Science Foundation, utilized advanced spectroscopy and astrometry to analyze the planet's orbit and composition. The findings suggest that HIP 99770 b is a unique and intriguing world, with a temperature similar to 1300 K and a gravity intermediate between that of other exoplanets.

Key Takeaways:

  • Researchers employed high-resolution spectroscopy and astrometry to study the exoplanet HIP 99770 b, providing a more accurate understanding of its orbit and mass.
  • The study revealed that HIP 99770 b has a dynamical mass of 13.1-5.2+4.8 MJup, with a relatively small semimajor axis of 15.7-15.8 au and a larger eccentricity of 0.28-0.29.
  • The research team discovered consistent results for HIP 99770 b's dynamical mass, including recent astrometry from the VLTI/GRAVITY instrument.
  • HIP 99770 b is considered a prime target for further spectroscopic follow-up with the Roman Coronagraph Instrument and thermal infrared observations with the James Webb Space Telescope.
  • The study's lead author, University of Texas San Antonio researcher Danielle Bovie, stated that the findings will help scientists better understand the planet's metallicity and chemistry.

Statistics:

  • The study utilized a higher resolution of R similar to 70 in the H and K band integral field spectroscopy.
  • The researchers analyzed a total of 70 data points to determine HIP 99770 b's orbit and mass.
  • The planet's dynamical mass is estimated to be 10-20 MJup.
  • The study's finding that HIP 99770 b has a temperature of similar to 1300 K and a gravity intermediate between that of other exoplanets.

Sources:

  • Multi-band Spectral and Astrometric Characterization of the Hip 99770 B Planet With Scexao/charis and Gaia. The Astronomical Journal, 2025;170(5).
  • NewsRx. New Findings on Physics Described by Investigators at University of Texas San Antonio (Multi-band Spectral and Astrometric Characterization of the Hip 99770 B Planet With Scexao/charis and Gaia). Journal of Physics Research. November 4, 2025; p 2174.

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