Tuson, A; Queloz, D; Osborn, H P; Wilson, T G; Hooton, M J; Beck, M; Lendl, M; Olofsson, G; Fortier, A; Bonfanti, A; Brandeker, A; Buchhave, L A; Collier Cameron, A; Ciardi, D R; Collins, K A; Gandolfi, D; Garai, Z; Giacalone, S; Gomes da Silva, J; Howell, S B; ... (2023). TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906. Monthly notices of the Royal Astronomical Society, 523(2), pp. 3090-3118. Oxford University Press 10.1093/mnras/stad1369
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We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ∼ 734 d, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS, and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24 ± 0.08 R⊕ and a period of 10.924709 ± 0.000032 d, whilst HD 15906 c has a radius of 2.93+0.07−0.06
R⊕ and a period of 21.583298+0.000052−0.000055
d. Assuming zero bond albedo and full day-night heat redistribution, the inner and outer planet have equilibrium temperatures of 668 ± 13 K and 532 ± 10 K, respectively. The HD 15906 system has become one of only six multiplanet systems with two warm (≲ 700 K) sub-Neptune sized planets transiting a bright star (G ≤ 10 mag). It is an excellent target for detailed characterization studies to constrain the composition of sub-Neptune planets and test theories of planet formation and evolution.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences 08 Faculty of Science > Physics Institute 10 Strategic Research Centers > Center for Space and Habitability (CSH) 08 Faculty of Science > Physics Institute > NCCR PlanetS |
UniBE Contributor: |
Osborn, Hugh Patrick, Hooton, Matthew John, Fortier, A., Ulmer-Moll, Solène Chloé, Alibert, Yann Daniel Pierre, Benz, Willy, Broeg, Christopher, Demory, Brice-Olivier Denys, Thomas, Nicolas |
Subjects: |
500 Science > 520 Astronomy 600 Technology > 620 Engineering 500 Science > 530 Physics |
ISSN: |
0035-8711 |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Dora Ursula Zimmerer |
Date Deposited: |
27 Oct 2023 07:02 |
Last Modified: |
27 Oct 2023 07:02 |
Publisher DOI: |
10.1093/mnras/stad1369 |
BORIS DOI: |
10.48350/187486 |
URI: |
https://boris.unibe.ch/id/eprint/187486 |
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