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Published July 23, 2021 | Version v1
Poster Open

Small and rocky worlds orbiting M dwarfs: GJ 3473 b and GJ 3929 b

  • 1. Landessternwarte, Zentrum für Astronomie der Universität Heidelberg
  • 2. Max-Planck-Institut für Astronomie Heidelberg
  • 3. Institut für Astrophysik Göttingen
  • 4. Centro de Astrobiología Madrid

Contributors

  • 1. Planetary Science Institut

Description

We present two small transiting planets with mass measurements orbiting bright mid M dwarfs (GJ 3473, GJ 3929). GJ 3473 b (Kemmer et al. 2020) is a hot, presumably rocky, planet (P = 1.198 d, Mb = 1.86 ± 0.30 Me, and radius, Rb = 1.264 ± 0.050 Re), which is due to its high temperature a particularly attractive target for thermal emission spectroscopy. Further, it is accompanied by another non-transiting planet (Pc = 15.509 ± 0.033 d) that has a minimum mass of Mc sin i = 7.41 ± 0.91 Me. For GJ 3929 b (in prep.) we present a preliminary analysis that yields a period of P = 2.616 d, mass Mb = 2.03 ± 0.59 Me, and radius, Rb = 1.155 ± 0.043 Re. The radial velocity data show evidence for another signal, whose origin is, however, not yet clarified.
Both systems add to the TESS level-one science goal to measure the masses for 50 transiting planets with radii smaller than 4 Re.

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Additional details

References

  • Kemmer, J., Stock, S., Kossakowski, D., et al. 2020, A&A, 642, A236
  • Southworth, J. 2011, MNRAS, 417, 2166
  • Zeng, L., Jacobsen, S. B., Sasselov, D. D., et al. 2019, Proc. Natl. Acad. Sci USA, 116, 9723