TESS Science Conference 2
Published July 23, 2021 | Version v1
Poster Open

TOI-682: two mini-Neptunes, one transiting

Creators

  • 1. Center for Astrophysics | Harvard & Smithsonian
  • 2. University of Southern Queensland
  • 3. Max-Planck-Institute für Astronomie
  • 4. Michigan State University
  • 5. Massachusetts Institute of Technology
  • 6. Carnegie Earth & Planets Laboratory
  • 7. The Observatories of the Carnegie Institution for Science
  • 8. Tsinghua University

Contributors

  • 1. Planetary Science Institute

Description

The TESS spacecraft detected transits of the G star HD 97260 (TOI-682), implying the presence of a planet with a radius of 3.49 Re and an orbital period of 6.84 days. We confirm the planet using radial velocities from the Planet Finder Spectrograph and measure its mass to be 12.3 Me. A second radial-velocity signal with a period of 16.1 days corresponds to a non-transiting planet with a minimum mass of 9.6 Me. We explore the dynamical interaction between the planets, which display significant non-zero eccentricities, and discuss the prospects for future characterization. In particular, TOI-682 b has an equilibrium temperature of 950 K, where relatively few atmospheres of Neptune-sized planets have been characterized. The transit depth (1300 ppm), modest density (1.58 g/cm^3), and brightness of the host star (V=10.0; H=8.2) should lead to high-S/N transmission spectroscopy.

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Additional details

References

  • Crossfield, I. J. M. & Kreidberg, L. 2017, AJ, 154, 261
  • Eastman, J. D., Rodriguez, J. E., Agol, E., et al. 2019, arXiv:1907.09480
  • Kempton, E. M.-R., Bean, J. L., Louie, D. R., et al. 2018, PASP, 130, 4401
  • Zeng, L., Jacobsen, S. B., Sasselov, D. D., et al. 2019, PNAS, 116, 9723