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

2019; IOP Publishing; Volume: 881; Issue: 1 Linguagem: Inglês

10.3847/2041-8213/ab322d

2041-8213

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

Astro and Planetary Science

Abstract 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.