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A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c

Guenther, E. W. and Goffo, E. and Sebastian, D. and Smith, A. M. S. and Persson, C. M. and Fridlund, M. and Gandolfi, D. and Korth, J. (2024) A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c. Monthly Notices of the Royal Astronomical Society, 529 (1), pp. 141-154. Oxford University Press. doi: 10.1093/mnras/stae494. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/529/1/141/7612268

Abstract

Ultra-short period planets (USPs) have orbital periods of less than 1 d. Since their masses and radii can be determined to a higher precision than long-period planets, they are the preferred targets to determine the density of planets which constrains their composition. The K2-106 system is particularly interesting because it contains two planets of nearly identical masses. One is a high-density USP, the other is a low-density planet that has an orbital period of 13 d. Combining the Gaia DR3 results with new ESPRESSO data allows us to determine the masses and radii of the two planets more precisely than before. We find that the USP K2-106 b has a density consistent with an Earth-like composition, and K2-106 c is a low-density planet that presumably has an extended atmosphere. We measure a radius of Rp=1.676+0.037−0.037R⊕, a mass of Mp=7.80+0.71−0.70M⊕, and a density of ρ=9.09+0.98−0.98gcm−3 for K2-106 b. For K2-106 c, we derive Rp=2.84+0.10−0.08R⊕, Mp=7.3+2.5−2.4M⊕, and a density of ρ=1.72+0.66−0.58gcm−3. We finally discuss the possible structures of the two planets with respect to other low-mass planets.

Item URL in elib:https://elib.dlr.de/203448/
Document Type:Article
Title:A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Guenther, E. W.Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, GermanyUNSPECIFIEDUNSPECIFIED
Goffo, E.Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy ; Thüringer Landessternwarte Tautenburg, GermanyUNSPECIFIEDUNSPECIFIED
Sebastian, D.School of Physics & Astronomy, University of Birmingham, Edg-baston, Birmingham, B15 2TT, UKUNSPECIFIEDUNSPECIFIED
Smith, A. M. S.UNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
Persson, C. M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, SwedenUNSPECIFIEDUNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA Leiden, The NetherlandsUNSPECIFIEDUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita di TorinoUNSPECIFIEDUNSPECIFIED
Korth, J.Lund Observatory, Division of Astrophysics, Department of Physics, Lund University, Lund, SwedenUNSPECIFIEDUNSPECIFIED
Date:2024
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:529
DOI:10.1093/mnras/stae494
Page Range:pp. 141-154
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:planets and satellites: fundamental parameters, planets and satellites: individual: K2-106b and K2-106c, planets and satellites: interiors, stars: fundamental parameters, stars: late-type, Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Smith, Dr Alexis M S
Deposited On:25 Mar 2024 14:37
Last Modified:25 Mar 2024 14:37

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