TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet

Johanna Teske, Matias R. Diaz, Rafael Luque, Teo Mocnik, Julia V. Seidel, Jon Fernandez Otegi, Fabo Feng, James S. Jenkins, Enric Pall, Damien Segransan, St phane Udry, Karen A. Collins, Jason D. Eastman, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, David R. AndersonThomas Barclay, Fran ois Bouchy, Jennifer A. Burt, R. Paul Butler, Douglas A. Caldwell, Kevin I. Collins, Jeffrey D. Crane, Caroline Dorn, Erin Flowers, Jonas Haldemann, Ravit Helled, Coel Hellier, Eric L.N. Jensen, Stephen R. Kane, Nicholas Law, Jack J. Lissauer, Andrew W. Mann, Maxime Marmier, Louise Dyregaard Nielsen, Mark E. Rose, Stephen A. Shectman, Avi Shporer, Guillermo Torres, Sharon X. Wang, Angie Wolfgang, Ian Wong, Carl Ziegler

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≈4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (∼1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of 2.16 0.08 R ⊕ and a mass of M ⊕, based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is 3.97 g cm-3, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the "radius gap"and the "hot Neptune desert,"HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition.

Original languageEnglish (US)
Article number96
JournalAstronomical Journal
Issue number2
StatePublished - Aug 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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