The young HD 73583 (TOI-560) planetary system : two 10-M⊕ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
(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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https://lup.lub.lu.se/record/af19a325-93d0-4fe1-b35c-c97a862350c3
- author
- Barragán, O. ; Korth, J. LU and Ziegler, Carl
- publishing date
- 2022-08-01
- 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}}, }