Gan, T, Bedell, M, Wang, SX, Foreman-Mackey, D, Melendez, J, Mao, S, Stassun, KG, Howell, SB, Ziegler, C, Wittenmyer, RA, Hellier, C, Collins, KA, Shporer, A, Ricker, GR, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Addison, BC, Ballard, S, Barclay, T, Bean, JL, Bowler, BP, Briceno, C, Crossfield, IJM, Dittman, J, Horner, J, Jensen, ELN, Kane, SR, Kielkopf, J, Kreidberg, L, Law, N, Mann, AW, Mengel, MW, Morgan, EH, Okumura, J, Osborn, HP, Paegert, M, Plavchan, P, Schwarz, RP, Shiao, B, Smith, JC, Spina, L, Tinney, CG, Torres, G, Twicken, JD, Vezie, M, Wang, G, Wright, DJ and Zhang, H (2021) HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS. Monthly Notices of the Royal Astronomical Society, 507 (2). 2220 - 2240. ISSN 0035-8711

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We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright (V = 8.75 mag, K = 7.15 mag) solar twin HD 183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located 56.8 ± 0.1 pc away with a radius of R* = 0.97 ± 0.02 R⊙ and a mass of M* = 1.03 ± 0.05 M⊙. We confirm the planetary nature by combining space and ground-based photometry, spectroscopy, and imaging. We find that HD 183579b (TOI-1055b) has a radius of Rp = 3.53 ± 0.13 R⊕ on a 17.47 d orbit with a mass of Mp = 11.2 ± 5.4 M⊕ (3σ mass upper limit of 27.4 M⊕). HD 183579b is the fifth brightest known sub-Neptune planet system in the sky, making it an excellent target for future studies of the interior structure and atmospheric properties. By performing a line-by-line differential analysis using the high-resolution and signal-to-noise ratio HARPS spectra, we find that HD 183579 joins the typical solar twin sample, without a statistically significant refractory element depletion.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
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Depositing User: Symplectic
Date Deposited: 19 Jan 2022 10:31
Last Modified: 19 Jan 2022 10:31

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