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

Barragán, O. ; Korth, J. LU and Ziegler, Carl (2022) In Monthly Notices of the Royal Astronomical Society 514(2). p.1606-1627
Abstract
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... (More)
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. (Less)
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author
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type
Contribution to journal
publication status
published
subject
keywords
planets and satellites: individual: HD 73583 (TOI-560), stars: activity, techniques: photometric, techniques: radial velocities
in
Monthly Notices of the Royal Astronomical Society
volume
514
issue
2
pages
22 pages
publisher
Oxford University Press
external identifiers
  • scopus:85133604712
ISSN
0035-8711
DOI
10.1093/mnras/stac638
language
English
LU publication?
no
additional info
Publisher Copyright: © 2022 The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society.
id
af19a325-93d0-4fe1-b35c-c97a862350c3
date added to LUP
2023-01-17 09:20:50
date last changed
2023-02-03 10:33:16
@article{af19a325-93d0-4fe1-b35c-c97a862350c3,
  abstract     = {{We present the discovery and characterization of two transiting planets observed by <em>TESS</em> in the light curves of the young and bright (<em>V</em> = 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<sub>⊙</sub> and 0.65 ± 0.02 R<sub>⊙</sub>, respectively. HD 73583 b (<em>P<sub>b</sub></em> = 6.3980420+0.0000067−0.0000062 d) has a mass and radius of 10.2+3.4−3.1 <em>M</em><sub>⊕</sub> and 2.79 ± 0.10 <em>R</em><sub>⊕</sub>, respectively, which gives a density of 2.58+0.95−0.81 gcm−3⁠. HD 73583 c (<em>P<sub>c</sub></em> = 18.87974+0.00086−0.00074 d) has a mass and radius of 9.7+1.8−1.7 <em>M</em><sub>⊕</sub> and 2.39+0.10−0.09 <em>R</em><sub>⊕</sub>, 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.}},
  author       = {{Barragán, O. and Korth, J. and Ziegler, Carl}},
  issn         = {{0035-8711}},
  keywords     = {{planets and satellites: individual: HD 73583 (TOI-560); stars: activity; techniques: photometric; techniques: radial velocities}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{2}},
  pages        = {{1606--1627}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{The young HD 73583 (TOI-560) planetary system : two 10-M<sub>⊕</sub> mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf}},
  url          = {{http://dx.doi.org/10.1093/mnras/stac638}},
  doi          = {{10.1093/mnras/stac638}},
  volume       = {{514}},
  year         = {{2022}},
}