HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS

Hellier

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 Rp = 3.53 ± 0.13?R? on a 17.47 d orbit with a mass of Mp = 11.2 ± 5.4?M? (3s 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.

Citation

Hellier. (2021). HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS. Monthly Notices of the Royal Astronomical Society, 2220 - 2240. https://doi.org/10.1093/mnras/stab2224

• Acceptance Date: Jul 28, 2021
• Publication Date: Oct 1, 2021
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Pages: 2220 - 2240
• DOI: https://doi.org/10.1093/mnras/stab2224
• Publisher URL: https://academic.oup.com/mnras/article-abstract/507/2/2220/6335490?redirectedFrom=fulltext