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

Tianjun Gan, Megan Bedell, Sharon Xuesong Wang, Daniel Foreman-Mackey, Jorge Meléndez, Shude Mao, Keivan G. Stassun, Steve B. Howell, Carl Ziegler, Robert A. Wittenmyer, Coel Hellier, Karen A. Collins, Avi Shporer, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Brett C. AddisonSarah Ballard, Thomas Barclay, Jacob L. Bean, Brendan P. Bowler, César Briceño, Ian J.M. Crossfield, Jason Dittman, Jonathan Horner, Eric L.N. Jensen, Stephen R. Kane, John Kielkopf, Laura Kreidberg, Nicholas Law, Andrew W. Mann, Matthew W. Mengel, Edward H. Morgan, Jack Okumura, Hugh P. Osborn, Martin Paegert, Peter Plavchan, Richard P. Schwarz, Bernie Shiao, Jeffrey C. Smith, Lorenzo Spina, C. G. Tinney, Guillermo Torres, Joseph D. Twicken, Michael Vezie, Gavin Wang, Duncan J. Wright, Hui Zhang

Research output: Contribution to journalArticlepeer-review

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 (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.

Original languageEnglish (US)
Pages (from-to)2220-2240
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume507
Issue number2
DOIs
StatePublished - Oct 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • 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

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