TESS Spots a Compact System of Super-Earths around the Naked-eye Star HR 858

Andrew Vanderburg, Chelsea X. Huang, Joseph E. Rodriguez, Juliette C. Becker, George R. Ricker, Roland K. Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Brett Addison, Allyson Bieryla, Cesar Briceño, Brendan P. Bowler, Timothy M. Brown, Christopher J. Burke, Jennifer A. Burt, Douglas A. Caldwell, Jake T. Clark, Ian CrossfieldJason A. Dittmann, Scott Dynes, Benjamin J. Fulton, Natalia Guerrero, Daniel Harbeck, Jonathan Horner, Stephen R. Kane, John Kielkopf, Adam L. Kraus, Laura Kreidberg, Nicolas Law, Andrew W. Mann, Matthew W. Mengel, Timothy D. Morton, Jack Okumura, Logan A. Pearce, Peter Plavchan, Samuel N. Quinn, Markus Rabus, Mark E. Rose, Pam Rowden, Avi Shporer, Robert J. Siverd, Jeffrey C. Smith, Keivan Stassun, C. G. Tinney, Rob Wittenmyer, Duncan J. Wright, Hui Zhang, George Zhou, Carl A. Ziegler

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75 Scopus citations


Transiting Exoplanet Survey Satellite (TESS) observations have revealed a compact multiplanet system around the sixth-magnitude star HR 858 (TIC 178155732, TOI 396), located 32 pc away. Three planets, each about twice the size of Earth, transit this slightly evolved, late F-type star, which is also a member of a visual binary. Two of the planets may be in mean motion resonance. We analyze the TESS observations, using novel methods to model and remove instrumental systematic errors, and combine these data with follow-up observations taken from a suite of ground-based telescopes to characterize the planetary system. The HR 858 planets are enticing targets for precise radial velocity observations, secondary eclipse spectroscopy, and measurements of the Rossiter-McLaughlin effect.

Original languageEnglish (US)
Article numberL19
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Aug 10 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • planets and satellites: detection
  • stars: individual (HR 858, TIC 178155732)


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