HATS-34b and HATS-46b: Re-characterization using TESS and Gaia

Emma M. Louden, Joel D. Hartman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We present a revised characterization of the previously discovered transiting planet systems HATS-34 and HATS-46. We make use of the newly available space-based light curves from the NASA TESS mission and high-precision parallax and absolute photometry measurements from the ESA Gaia mission to determine the mass and radius of the planets and host stars with dramatically increased precision and accuracy compared to published values, with the uncertainties in some parameters reduced by as much as a factor of 7. Using an isochrone-based fit, for HATS-34 we measure a revised host star mass and radius of $0.952_{-0.020}^{+0.040}$ $\, \mathrm{M}_\odot$ and 0.9381 ± 0.0080 $\, \mathrm{R}_\odot$, respectively, and a revised mass and radius for the transiting planet of 0.951 ± 0.050 MJ and 1.282 ± 0.064 RJ, respectively. Similarly, for HATS-46 we measure a revised mass and radius for the host star of 0.869 ± 0.023 $\, \mathrm{M}_\odot$ and 0.894 ± 0.010 $\, \mathrm{R}_\odot$, respectively, and a revised mass and radius for the planet of 0.158 ± 0.042 MJ and 0.951 ± 0.029 RJ, respectively. The uncertainties that we determine on the stellar and planetary masses and radii are also substantially lower than re-determinations that incorporate the Gaia results without performing a full re-analysis of the light curves and other observational data. We argue that, in light of Gaia and TESS, a full re-analysis of previously discovered transiting planets is warranted.

Original languageEnglish (US)
Pages (from-to)5393-5407
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Mar 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planets and satellites: individual (HATS-34b, HATS-46b)
  • stars: individual (HATS-34, HATS-46)


Dive into the research topics of 'HATS-34b and HATS-46b: Re-characterization using TESS and Gaia'. Together they form a unique fingerprint.

Cite this