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

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Název: A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c
Autoři: Guenther, E. W., Goffo, E., Sebastian, D., Smith, A. M.S., Persson, Carina, 1964, Fridlund, Malcolm, 1952, Gandolfi, D., Korth, Judith, 1987
Zdroj: Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2) Monthly Notices of the Royal Astronomical Society. 529(1):141-154
Témata: planets and satellites: interiors, stars: fundamental parameters, stars: late-type, planets and satellites: fundamental parameters, planets and satellites: individual: K2-106b and K2-106c
Popis: 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 R p = 1 . 676 + 0 . 037 -0 . 037 R ⊕, a mass of M p = 7 . 80 + 0 . 71 -0 . 70 M ⊕, and a density of ρ= 9 . 09 + 0 . 98 -0 . 98 g cm -3 for K2-106 b. For K2-106 c, we derive R p = 2 . 84 + 0 . 10 -0 . 08 R ⊕, M p = 7 . 3 + 2 . 5 -2 . 4 M ⊕, and a density of ρ= 1 . 72 + 0 . 66 -0 . 58 g cm -3 . We finally discuss the possible structures of the two planets with respect to other low-mass planets.
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Přístupová URL adresa: https://research.chalmers.se/publication/540326
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  Data: A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c
– Name: Author
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  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Guenther%2C+E%2E+W%2E%22">Guenther, E. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Goffo%2C+E%2E%22">Goffo, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Sebastian%2C+D%2E%22">Sebastian, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Smith%2C+A%2E+M%2ES%2E%22">Smith, A. M.S.</searchLink><br /><searchLink fieldCode="AR" term="%22Persson%2C+Carina%22">Persson, Carina</searchLink>, 1964<br /><searchLink fieldCode="AR" term="%22Fridlund%2C+Malcolm%22">Fridlund, Malcolm</searchLink>, 1952<br /><searchLink fieldCode="AR" term="%22Gandolfi%2C+D%2E%22">Gandolfi, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Korth%2C+Judith%22">Korth, Judith</searchLink>, 1987
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <i>Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2) Monthly Notices of the Royal Astronomical Society</i>. 529(1):141-154
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22planets+and+satellites%3A+interiors%22">planets and satellites: interiors</searchLink><br /><searchLink fieldCode="DE" term="%22stars%3A+fundamental+parameters%22">stars: fundamental parameters</searchLink><br /><searchLink fieldCode="DE" term="%22stars%3A+late-type%22">stars: late-type</searchLink><br /><searchLink fieldCode="DE" term="%22planets+and+satellites%3A+fundamental+parameters%22">planets and satellites: fundamental parameters</searchLink><br /><searchLink fieldCode="DE" term="%22planets+and+satellites%3A+individual%3A+K2-106b+and+K2-106c%22">planets and satellites: individual: K2-106b and K2-106c</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: 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 R p = 1 . 676 + 0 . 037 -0 . 037 R ⊕, a mass of M p = 7 . 80 + 0 . 71 -0 . 70 M ⊕, and a density of ρ= 9 . 09 + 0 . 98 -0 . 98 g cm -3 for K2-106 b. For K2-106 c, we derive R p = 2 . 84 + 0 . 10 -0 . 08 R ⊕, M p = 7 . 3 + 2 . 5 -2 . 4 M ⊕, and a density of ρ= 1 . 72 + 0 . 66 -0 . 58 g cm -3 . We finally discuss the possible structures of the two planets with respect to other low-mass planets.
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  Data: electronic
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        Value: 10.1093/mnras/stae494
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      – SubjectFull: stars: fundamental parameters
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      – SubjectFull: planets and satellites: individual: K2-106b and K2-106c
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              Y: 2024
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