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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

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Barragán, O., Armstrong, David J., Gandolfi, D., Carleo, I., Vidotto, A. A., D’Angelo, C. Villarreal, Oklopčić, A., Isaacson, H., Oddo, D., Collins, K. et al.
(2022) The young HD 73583 (TOI-560) planetary system : two 10-M⊕ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf. Monthly Notices of the Royal Astronomical Society, 514 (2). pp. 1606-1627. doi:10.1093/mnras/stac638 ISSN 1365-2966.

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Official URL: https://doi.org/10.1093/mnras/stac638

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Abstract

We present the discovery and characterisation 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 characterise 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 =$6.3980420 _{ - 0.0000062 } ^ { + 0.0000067 }$ d) has a mass and radius of $10.2 _{ - 3.1 } ^ { + 3.4 }$ M⊕ and 2.79 ± 0.10 R⊕, respectively, that gives a density of $2.58 _{ - 0.81 } ^ { + 0.95 }$ g cm−3. HD 73583 c (Pc=$18.87974 _{ - 0.00074 } ^ { + 0.00086 }$ d) has a mass and radius of $9.7 _{ - 1.7 } ^ { + 1.8 }$ M⊕ and $2.39 _{ - 0.09 } ^ { + 0.10 }$ R⊕, respectively, this translates to a density of $3.88 _{ - 0.80 } ^ { + 0.91 }$ g cm−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 on-going 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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Extrasolar planets, Astronomical photometry, Dwarf stars , Stars -- Motion in line of sight, Astrophysics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: August 2022
Dates:
DateEvent
August 2022Published
15 March 2022Available
5 March 2022Accepted
Volume: 514
Number: 2
Page Range: pp. 1606-1627
DOI: 10.1093/mnras/stac638
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): ** Article version: AM ** From Crossref journal articles via Jisc Publications Router ** History: epub 15-03-2022; issued 15-03-2022. ** Licence for AM version of this article starting on 15-03-2022: https://creativecommons.org/licenses/by/4.0/
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 27 July 2022
Date of first compliant Open Access: 28 July 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/M001962/1 [STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/S002642/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
865624[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
2018.2323Cassa di Risparmio di Torinohttp://viaf.org/viaf/167495689
ST/R00384X/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
HA 3279/12-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
LTT-20015Czech Republic. Ministerstvo školství, mládeže a tělovýchovyhttp://viaf.org/viaf/312885350
UID/FIS/04434/2019Fundação para a Ciência e Tecnologiahttp://viaf.org/viaf/148753396
UIDB/04434/2020Fundação para a Ciência e Tecnologiahttp://viaf.org/viaf/148753396
UIDP/04434/2020Fundação para a Ciência e Tecnologiahttp://viaf.org/viaf/148753396
PTDC/FIS-AST/32113/2017Programa Operacional Competitividade e InternacionalizaçãoUNSPECIFIED
POCI-01-0145-FEDER-032113Programa Operacional Competitividade e InternacionalizaçãoUNSPECIFIED
PTDC/FISAST /28953/2017Programa Operacional Competitividade e InternacionalizaçãoUNSPECIFIED
POCI-01-0145-FEDER-028953Programa Operacional Competitividade e InternacionalizaçãoUNSPECIFIED
724427[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
DNR 177/19Swedish National Space Agencyhttp://dx.doi.org/10.13039/501100001859
174/18Swedish National Space Agencyhttp://dx.doi.org/10.13039/501100001859
2020-00104Swedish National Space Agencyhttp://dx.doi.org/10.13039/501100001859
65/19Swedish National Space Agencyhttp://dx.doi.org/10.13039/501100001859
CVU-1005374Consejo Nacional de Ciencia y Tecnologíahttp://viaf.org/viaf/147206461
847648: LCF/BQ/PI20/11760023Marie Sklodowska-CurieUNSPECIFIED
817540, ASTROFLOW[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
DGE-1842400National Science Foundation Graduate Research Fellowship ProgramUNSPECIFIED
1829740[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
DGE 1745301National Science Foundation Graduate Research Fellowship ProgramUNSPECIFIED
PID2019-109522GB-C52Ministerio de Ciencia e Innovaciónhttp://viaf.org/viaf/137614380
CH 2636/1-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
837319Centre National d'études Spatialeshttp://viaf.org/viaf/131089741
IF/00650/2015/CP1273/CT0001Fundação para a Ciência e Tecnologiahttp://viaf.org/viaf/148753396
SCORE No 851555[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
PID2019-107061GB-C66Ministerio de Ciencia e Innovaciónhttp://viaf.org/viaf/137614380
80NSSC19K1727TESS Guest Investigator ProgramUNSPECIFIED
18-2XRP18 2-0136NASA Exoplanet Research ProgramUNSPECIFIED
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
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