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korth

Judith Korth

Postdoc

korth

The young HD 73583 (TOI-560) planetary system : two 10-M mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf

Author

  • O. Barragán
  • J. Korth
  • Carl Ziegler

Summary, in English

We present the discovery and characterization of two transiting planets observed by TESS in the light curves of the young and bright (V = 9.67) star HD73583 (TOI-560). We perform an intensive spectroscopic and photometric space- and ground-based follow-up in order to confirm and characterize the system. We found that HD73583 is a young (∼500 Myr) active star with a rotational period of 12.08 ± 0.11 d, and a mass and radius of 0.73 ± 0.02 M and 0.65 ± 0.02 R, respectively. HD 73583 b (Pb = 6.3980420+0.0000067−0.0000062 d) has a mass and radius of 10.2+3.4−3.1 M and 2.79 ± 0.10 R, respectively, which gives a density of 2.58+0.95−0.81 gcm−3⁠. HD 73583 c (Pc = 18.87974+0.00086−0.00074 d) has a mass and radius of 9.7+1.8−1.7 M and 2.39+0.10−0.09 R, respectively, which translates to a density of 3.88+0.91−0.80 gcm−3⁠. Both planets are consistent with worlds made of a solid core surrounded by a volatile envelope. Because of their youth and host star brightness, they both are excellent candidates to perform transmission spectroscopy studies. We expect ongoing atmospheric mass-loss for both planets caused by stellar irradiation. We estimate that the detection of evaporating signatures on H and He would be challenging, but doable with present and future instruments.

Publishing year

2022-08-01

Language

English

Pages

1606-1627

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

514

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • planets and satellites: individual: HD 73583 (TOI-560)
  • stars: activity
  • techniques: photometric
  • techniques: radial velocities

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711