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Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
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Number of Authors: 1182022 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 511, no 3, p. 4551-4571Article in journal (Refereed) Published
Abstract [en]

We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data withTESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presenceof four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R⊕, M = 2.0 M⊕), c (P = 10.78 d, R = 2.91 R⊕, M =5.4 M⊕), d (P = 25.7 d, R = 2.82 R⊕, M = 13.2 M⊕), and e (P = 77 d, R = 2.55 R⊕, M = 12.6 R⊕). Moreover, we identifyan additional, long-period signal (>450 d) in the RVs, which could be due to either an external planetary companion or tostellar magnetic activity. The precise masses and radii obtained for the four planets allowed us to conduct interior structure andatmospheric escape modelling. TOI-561 b is confirmed to be the lowest density (ρb = 3.8 ± 0.5 g cm−3) ultra-short period(USP) planet known to date, and the low metallicity of the host star makes it consistent with the general bulk density-stellarmetallicity trend. According to our interior structure modelling, planet b has basically no gas envelope, and it could host a certainamount of water. In contrast, TOI-561 c, d, and e likely retained an H/He envelope, in addition to a possibly large water layer.The inferred planetary compositions suggest different atmospheric evolutionary paths, with planets b and c having experiencedsignificant gas loss, and planets d and e showing an atmospheric content consistent with the original one. The uniqueness ofthe USP planet, the presence of the long-period planet TOI-561 e, and the complex architecture make this system an appealingtarget for follow-up studies.

Place, publisher, year, edition, pages
2022. Vol. 511, no 3, p. 4551-4571
Keywords [en]
techniques: photometric, techniques: radial velocities, planets and satellites: fundamental parameters, planets and satellites: interiors, stars: individual: TOI-561 (TIC 377064495, Gaia EDR3 3850421005290172416)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-203241DOI: 10.1093/mnras/stac199ISI: 000762069800005OAI: oai:DiVA.org:su-203241DiVA, id: diva2:1646987
Available from: 2022-03-24 Created: 2022-03-24 Last updated: 2022-03-24Bibliographically approved

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Brandeker, AlexisFlorén, Hans-GustavOlofsson, Göran

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Brandeker, AlexisBuchhave, L. A.Florén, Hans-GustavOlofsson, Göran
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