HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS. Issue 2 (2nd August 2021)

• Record Type: Journal Article
• Authors: Gan, Tianjun; Bedell, Megan; Wang, Sharon Xuesong; Foreman-Mackey, Daniel; Meléndez, Jorge; Mao, Shude; Stassun, Keivan G; Howell, Steve B; Ziegler, Carl; Wittenmyer, Robert A; Hellier, Coel; Collins, Karen A; Shporer, Avi; Ricker, George R; Vanderspek, Roland; Latham, David W; Seager, Sara; Winn, Joshua N; Jenkins, Jon M; Addison, Brett C; Ballard, Sarah; Barclay, Thomas; Bean, Jacob L; Bowler, Brendan P; Briceño, César; Crossfield, Ian J M; Dittman, Jason; Horner, Jonathan; Jensen, Eric L N; Kane, Stephen R; Kielkopf, John; Kreidberg, Laura; Law, Nicholas; Mann, Andrew W; Mengel, Matthew W; Morgan, Edward H; Okumura, Jack; Osborn, Hugh P; Paegert, Martin; Plavchan, Peter; Schwarz, Richard P; Shiao, Bernie; Smith, Jeffrey C; Spina, Lorenzo; Tinney, C G; Torres, Guillermo; Twicken, Joseph D; Vezie, Michael; Wang, Gavin; Wright, Duncan J; Zhang, Hui;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 507:Issue 2(2021)
• Page Start: 2220
• Page End: 2240
• Publication Date: 2021-08-02
• Subjects: planets and satellites: detection -- planets and satellites: gaseous planets -- planets and satellites: individual: (HD 183579, HIP 96160, TIC 320004517, TOI 1055) -- stars: abundances -- stars: solar type; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab2224
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: 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 R p = 3.53 ± 0.13 R ⊕ on a 17.47 d orbit with a mass of M p = 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.